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mariadb/mysql-test/suite/innodb/r/index_merge_threshold.result
Marko Mäkelä 2f7d91bb6c MDEV-22242 B-trees can become extremely skewed 
The test innodb.innodb_wl6326 that had been disabled in 10.4 due to
MDEV-21535 is failing on 10.5 due to a different reason: the removal
of the MLOG_COMP_END_COPY_CREATED operations in MDEV-12353
commit 276f996af9 caused PAGE_LAST_INSERT
to be set to something nonzero by the function page_copy_rec_list_end().

This in turn would cause btr_page_get_split_rec_to_right() to behave
differently: we would not attempt to split the page at all, but simply
insert the new record into the new, empty, right leaf page.

Even though the change reduced the sizes of some tables, it is better
to aim for balanced trees.

page_copy_rec_list_end(), PageBulk::finishPage():
Preserve PAGE_LAST_INSERT, PAGE_N_DIRECTION, PAGE_DIRECTION.

PageBulk::finish(): Move some common code from PageBulk::finishPage().
2020-04-14 18:43:03 +03:00

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SET @saved_frequency = @@GLOBAL.innodb_purge_rseg_truncate_frequency;
SET GLOBAL innodb_purge_rseg_truncate_frequency = 1;
CREATE TABLE tab(a BIGINT PRIMARY KEY,c1 TINYTEXT,c2 TEXT,c3 MEDIUMTEXT,
c4 TINYBLOB,c5 BLOB,c6 MEDIUMBLOB,c7 LONGBLOB) ENGINE=InnoDB;
CREATE INDEX index1 ON tab(c1(255)) COMMENT 'Check index level merge MERGE_THRESHOLD=51';
Warnings:
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
CREATE INDEX index2 ON tab(c2(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=-1';
Warnings:
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
CREATE INDEX index3 ON tab(c3(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=20';
Warnings:
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
CREATE INDEX index4 ON tab(c4(255)) COMMENT 'Check index level merge MERGE_THRESHOLD=25';
Warnings:
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
CREATE INDEX index5 ON tab(c5(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=30';
Warnings:
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
CREATE INDEX index6 ON tab(c6(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=35';
Warnings:
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
CREATE INDEX index7 ON tab(c7(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=40';
Warnings:
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
SHOW CREATE TABLE tab;
Table Create Table
tab CREATE TABLE `tab` (
`a` bigint(20) NOT NULL,
`c1` tinytext DEFAULT NULL,
`c2` text DEFAULT NULL,
`c3` mediumtext DEFAULT NULL,
`c4` tinyblob DEFAULT NULL,
`c5` blob DEFAULT NULL,
`c6` mediumblob DEFAULT NULL,
`c7` longblob DEFAULT NULL,
PRIMARY KEY (`a`),
KEY `index1` (`c1`(255)) COMMENT 'Check index level merge MERGE_THRESHOLD=51',
KEY `index2` (`c2`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=-1',
KEY `index3` (`c3`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=20',
KEY `index4` (`c4`(255)) COMMENT 'Check index level merge MERGE_THRESHOLD=25',
KEY `index5` (`c5`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=30',
KEY `index6` (`c6`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=35',
KEY `index7` (`c7`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=40'
) ENGINE=InnoDB DEFAULT CHARSET=latin1
SELECT t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
WHERE t.TABLE_ID = i.TABLE_ID AND t.NAME = 'test/tab';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab PRIMARY 50
test/tab index1 50
test/tab index2 50
test/tab index3 20
test/tab index4 25
test/tab index5 30
test/tab index6 35
test/tab index7 40
ALTER TABLE tab comment='MERGE_THRESHOLD=49';
Warnings:
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
SHOW CREATE TABLE tab;
Table Create Table
tab CREATE TABLE `tab` (
`a` bigint(20) NOT NULL,
`c1` tinytext DEFAULT NULL,
`c2` text DEFAULT NULL,
`c3` mediumtext DEFAULT NULL,
`c4` tinyblob DEFAULT NULL,
`c5` blob DEFAULT NULL,
`c6` mediumblob DEFAULT NULL,
`c7` longblob DEFAULT NULL,
PRIMARY KEY (`a`),
KEY `index1` (`c1`(255)) COMMENT 'Check index level merge MERGE_THRESHOLD=51',
KEY `index2` (`c2`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=-1',
KEY `index3` (`c3`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=20',
KEY `index4` (`c4`(255)) COMMENT 'Check index level merge MERGE_THRESHOLD=25',
KEY `index5` (`c5`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=30',
KEY `index6` (`c6`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=35',
KEY `index7` (`c7`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=40'
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='MERGE_THRESHOLD=49'
SELECT t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
WHERE t.TABLE_ID = i.TABLE_ID AND t.NAME = 'test/tab';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab PRIMARY 49
test/tab index1 49
test/tab index2 49
test/tab index3 20
test/tab index4 25
test/tab index5 30
test/tab index6 35
test/tab index7 40
ALTER TABLE tab MODIFY COLUMN c7 VARCHAR(2048) ;
Warnings:
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
SHOW CREATE TABLE tab;
Table Create Table
tab CREATE TABLE `tab` (
`a` bigint(20) NOT NULL,
`c1` tinytext DEFAULT NULL,
`c2` text DEFAULT NULL,
`c3` mediumtext DEFAULT NULL,
`c4` tinyblob DEFAULT NULL,
`c5` blob DEFAULT NULL,
`c6` mediumblob DEFAULT NULL,
`c7` varchar(2048) DEFAULT NULL,
PRIMARY KEY (`a`),
KEY `index1` (`c1`(255)) COMMENT 'Check index level merge MERGE_THRESHOLD=51',
KEY `index2` (`c2`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=-1',
KEY `index3` (`c3`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=20',
KEY `index4` (`c4`(255)) COMMENT 'Check index level merge MERGE_THRESHOLD=25',
KEY `index5` (`c5`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=30',
KEY `index6` (`c6`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=35',
KEY `index7` (`c7`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=40'
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='MERGE_THRESHOLD=49'
SELECT t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
WHERE t.TABLE_ID = i.TABLE_ID AND t.NAME = 'test/tab';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab PRIMARY 49
test/tab index1 49
test/tab index2 49
test/tab index3 20
test/tab index4 25
test/tab index5 30
test/tab index6 35
test/tab index7 40
ALTER TABLE tab ADD INDEX index8 (c7(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=45';
Warnings:
Note 1831 Duplicate index `index8`. This is deprecated and will be disallowed in a future release
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
Warning 1478 InnoDB: Invalid value for MERGE_THRESHOLD in the CREATE TABLE statement. The value is ignored.
SHOW CREATE TABLE tab;
Table Create Table
tab CREATE TABLE `tab` (
`a` bigint(20) NOT NULL,
`c1` tinytext DEFAULT NULL,
`c2` text DEFAULT NULL,
`c3` mediumtext DEFAULT NULL,
`c4` tinyblob DEFAULT NULL,
`c5` blob DEFAULT NULL,
`c6` mediumblob DEFAULT NULL,
`c7` varchar(2048) DEFAULT NULL,
PRIMARY KEY (`a`),
KEY `index1` (`c1`(255)) COMMENT 'Check index level merge MERGE_THRESHOLD=51',
KEY `index2` (`c2`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=-1',
KEY `index3` (`c3`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=20',
KEY `index4` (`c4`(255)) COMMENT 'Check index level merge MERGE_THRESHOLD=25',
KEY `index5` (`c5`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=30',
KEY `index6` (`c6`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=35',
KEY `index7` (`c7`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=40',
KEY `index8` (`c7`(750)) COMMENT 'Check index level merge MERGE_THRESHOLD=45'
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COMMENT='MERGE_THRESHOLD=49'
SELECT t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
FROM INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
WHERE t.TABLE_ID = i.TABLE_ID AND t.NAME = 'test/tab';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab PRIMARY 49
test/tab index1 49
test/tab index2 49
test/tab index3 20
test/tab index4 25
test/tab index5 30
test/tab index6 35
test/tab index7 40
test/tab index8 45
DROP TABLE tab;
#
# behavior for deleting records
#
# test to confirm behavior (MERGE_THRESHOLD=50 (default))
CREATE TABLE tab1 (a bigint primary key, b varchar(2048)) engine=InnoDB;
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab1 PRIMARY 50
insert into tab1 values (1, repeat('a',2048));
insert into tab1 values (2, repeat('a',2048));
insert into tab1 values (3, repeat('a',2048));
insert into tab1 values (8, repeat('a',2048));
insert into tab1 values (9, repeat('a',2048));
insert into tab1 values (10, repeat('a',2048));
insert into tab1 values (11, repeat('a',2048));
insert into tab1 values (12, repeat('a',2048));
insert into tab1 values (4, repeat('a',2048));
insert into tab1 values (5, repeat('a',2048));
insert into tab1 values (6, repeat('a',2048));
insert into tab1 values (7, repeat('a',2048));
insert into tab1 values (13, repeat('a',2048));
insert into tab1 values (14, repeat('a',2048));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 7
5 7
begin;
delete from tab1 where a = 12;
delete from tab1 where a = 13;
delete from tab1 where a = 14;
delete from tab1 where a = 5;
delete from tab1 where a = 6;
delete from tab1 where a = 7;
commit;
InnoDB 0 transactions not purged
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 4
5 4
delete from tab1 where a = 11;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
delete from tab1 where a = 10;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=35 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 2
index_page_merge_successful 2
delete from tab1 where a = 9;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=25 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 2
index_page_merge_successful 2
DROP TABLE tab1;
# test to confirm behavior (MERGE_THRESHOLD=35)
CREATE TABLE tab1 (a bigint primary key, b varchar(2048)) engine=InnoDB
COMMENT='MERGE_THRESHOLD=35';
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab1 PRIMARY 35
insert into tab1 values (1, repeat('a',2048));
insert into tab1 values (2, repeat('a',2048));
insert into tab1 values (3, repeat('a',2048));
insert into tab1 values (8, repeat('a',2048));
insert into tab1 values (9, repeat('a',2048));
insert into tab1 values (10, repeat('a',2048));
insert into tab1 values (11, repeat('a',2048));
insert into tab1 values (12, repeat('a',2048));
insert into tab1 values (4, repeat('a',2048));
insert into tab1 values (5, repeat('a',2048));
insert into tab1 values (6, repeat('a',2048));
insert into tab1 values (7, repeat('a',2048));
insert into tab1 values (13, repeat('a',2048));
insert into tab1 values (14, repeat('a',2048));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 7
5 7
begin;
delete from tab1 where a = 12;
delete from tab1 where a = 13;
delete from tab1 where a = 14;
delete from tab1 where a = 5;
delete from tab1 where a = 6;
delete from tab1 where a = 7;
commit;
InnoDB 0 transactions not purged
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 4
5 4
delete from tab1 where a = 11;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
delete from tab1 where a = 10;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=35 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
delete from tab1 where a = 9;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=25 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 2
index_page_merge_successful 2
DROP TABLE tab1;
# test to confirm behavior (MERGE_THRESHOLD=25)
CREATE TABLE tab1 (a bigint primary key, b varchar(2048)) engine=InnoDB
COMMENT='MERGE_THRESHOLD=25';
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab1 PRIMARY 25
insert into tab1 values (1, repeat('a',2048));
insert into tab1 values (2, repeat('a',2048));
insert into tab1 values (3, repeat('a',2048));
insert into tab1 values (8, repeat('a',2048));
insert into tab1 values (9, repeat('a',2048));
insert into tab1 values (10, repeat('a',2048));
insert into tab1 values (11, repeat('a',2048));
insert into tab1 values (12, repeat('a',2048));
insert into tab1 values (4, repeat('a',2048));
insert into tab1 values (5, repeat('a',2048));
insert into tab1 values (6, repeat('a',2048));
insert into tab1 values (7, repeat('a',2048));
insert into tab1 values (13, repeat('a',2048));
insert into tab1 values (14, repeat('a',2048));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 7
5 7
begin;
delete from tab1 where a = 12;
delete from tab1 where a = 13;
delete from tab1 where a = 14;
delete from tab1 where a = 5;
delete from tab1 where a = 6;
delete from tab1 where a = 7;
commit;
InnoDB 0 transactions not purged
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 4
5 4
delete from tab1 where a = 11;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
delete from tab1 where a = 10;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=35 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
delete from tab1 where a = 9;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=25 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
DROP TABLE tab1;
# test to confirm partitioned table (MERGE_THRESHOLD=35)
CREATE TABLE tab1 (a bigint primary key, b varchar(2048))
COMMENT='MERGE_THRESHOLD=35'
PARTITION BY RANGE (a)
(PARTITION p0 VALUES LESS THAN (20) ENGINE = InnoDB,
PARTITION p1 VALUES LESS THAN MAXVALUE ENGINE = InnoDB);
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab1#p#p0 PRIMARY 35
test/tab1#p#p1 PRIMARY 35
insert into tab1 values (1, repeat('a',2048));
insert into tab1 values (2, repeat('a',2048));
insert into tab1 values (3, repeat('a',2048));
insert into tab1 values (8, repeat('a',2048));
insert into tab1 values (9, repeat('a',2048));
insert into tab1 values (10, repeat('a',2048));
insert into tab1 values (11, repeat('a',2048));
insert into tab1 values (12, repeat('a',2048));
insert into tab1 values (4, repeat('a',2048));
insert into tab1 values (5, repeat('a',2048));
insert into tab1 values (6, repeat('a',2048));
insert into tab1 values (7, repeat('a',2048));
insert into tab1 values (13, repeat('a',2048));
insert into tab1 values (14, repeat('a',2048));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 0
3 2
4 7
5 7
begin;
delete from tab1 where a = 12;
delete from tab1 where a = 13;
delete from tab1 where a = 14;
delete from tab1 where a = 5;
delete from tab1 where a = 6;
delete from tab1 where a = 7;
commit;
InnoDB 0 transactions not purged
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 0
3 2
4 4
5 4
delete from tab1 where a = 11;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
delete from tab1 where a = 10;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=35 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
delete from tab1 where a = 9;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=25 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 2
index_page_merge_successful 2
DROP TABLE tab1;
#
# behavior for updating to smaller records
#
# test to confirm behavior (MERGE_THRESHOLD=50 (default))
CREATE TABLE tab1 (a bigint primary key, b varchar(2048)) engine=InnoDB;
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab1 PRIMARY 50
insert into tab1 values (1, repeat('a',2048));
insert into tab1 values (2, repeat('a',2048));
insert into tab1 values (3, repeat('a',2048));
insert into tab1 values (8, repeat('a',2048));
insert into tab1 values (9, repeat('a',2048));
insert into tab1 values (10, repeat('a',2048));
insert into tab1 values (11, repeat('a',2048));
insert into tab1 values (12, repeat('a',2048));
insert into tab1 values (4, repeat('a',2048));
insert into tab1 values (5, repeat('a',2048));
insert into tab1 values (6, repeat('a',2048));
insert into tab1 values (7, repeat('a',2048));
insert into tab1 values (13, repeat('a',2048));
insert into tab1 values (14, repeat('a',2048));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 7
5 7
update tab1 set b='' where a = 12;
update tab1 set b='' where a = 13;
update tab1 set b='' where a = 14;
update tab1 set b='' where a = 5;
update tab1 set b='' where a = 6;
update tab1 set b='' where a = 7;
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 7
5 7
update tab1 set b='' where a = 11;
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
update tab1 set b='' where a = 10;
# check page merge happens (MERGE_THRESHOLD=35 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
update tab1 set b='' where a = 9;
# check page merge happens (MERGE_THRESHOLD=25 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
DROP TABLE tab1;
# test to confirm behavior (MERGE_THRESHOLD=35)
CREATE TABLE tab1 (a bigint primary key, b varchar(2048)) engine=InnoDB
COMMENT='MERGE_THRESHOLD=35';
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab1 PRIMARY 35
insert into tab1 values (1, repeat('a',2048));
insert into tab1 values (2, repeat('a',2048));
insert into tab1 values (3, repeat('a',2048));
insert into tab1 values (8, repeat('a',2048));
insert into tab1 values (9, repeat('a',2048));
insert into tab1 values (10, repeat('a',2048));
insert into tab1 values (11, repeat('a',2048));
insert into tab1 values (12, repeat('a',2048));
insert into tab1 values (4, repeat('a',2048));
insert into tab1 values (5, repeat('a',2048));
insert into tab1 values (6, repeat('a',2048));
insert into tab1 values (7, repeat('a',2048));
insert into tab1 values (13, repeat('a',2048));
insert into tab1 values (14, repeat('a',2048));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 7
5 7
update tab1 set b='' where a = 12;
update tab1 set b='' where a = 13;
update tab1 set b='' where a = 14;
update tab1 set b='' where a = 5;
update tab1 set b='' where a = 6;
update tab1 set b='' where a = 7;
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 7
5 7
update tab1 set b='' where a = 11;
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
update tab1 set b='' where a = 10;
# check page merge happens (MERGE_THRESHOLD=35 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
update tab1 set b='' where a = 9;
# check page merge happens (MERGE_THRESHOLD=25 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
DROP TABLE tab1;
# test to confirm behavior (MERGE_THRESHOLD=25)
CREATE TABLE tab1 (a bigint primary key, b varchar(2048)) engine=InnoDB
COMMENT='MERGE_THRESHOLD=25';
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab1 PRIMARY 25
insert into tab1 values (1, repeat('a',2048));
insert into tab1 values (2, repeat('a',2048));
insert into tab1 values (3, repeat('a',2048));
insert into tab1 values (8, repeat('a',2048));
insert into tab1 values (9, repeat('a',2048));
insert into tab1 values (10, repeat('a',2048));
insert into tab1 values (11, repeat('a',2048));
insert into tab1 values (12, repeat('a',2048));
insert into tab1 values (4, repeat('a',2048));
insert into tab1 values (5, repeat('a',2048));
insert into tab1 values (6, repeat('a',2048));
insert into tab1 values (7, repeat('a',2048));
insert into tab1 values (13, repeat('a',2048));
insert into tab1 values (14, repeat('a',2048));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 7
5 7
update tab1 set b='' where a = 12;
update tab1 set b='' where a = 13;
update tab1 set b='' where a = 14;
update tab1 set b='' where a = 5;
update tab1 set b='' where a = 6;
update tab1 set b='' where a = 7;
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 2
4 7
5 7
update tab1 set b='' where a = 11;
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
update tab1 set b='' where a = 10;
# check page merge happens (MERGE_THRESHOLD=35 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
update tab1 set b='' where a = 9;
# check page merge happens (MERGE_THRESHOLD=25 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
DROP TABLE tab1;
# test to confirm explicit temporary table (MERGE_THRESHOLD=35)
# (though not registered to SYS_TABLES,SYS_INDEXES, it works correctly)
CREATE TEMPORARY TABLE tab1 (a bigint primary key, b varchar(2048)) engine=InnoDB
COMMENT='MERGE_THRESHOLD=35';
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
insert into tab1 values (1, repeat('a',2048));
insert into tab1 values (2, repeat('a',2048));
insert into tab1 values (3, repeat('a',2048));
insert into tab1 values (8, repeat('a',2048));
insert into tab1 values (9, repeat('a',2048));
insert into tab1 values (10, repeat('a',2048));
insert into tab1 values (11, repeat('a',2048));
insert into tab1 values (12, repeat('a',2048));
insert into tab1 values (4, repeat('a',2048));
insert into tab1 values (5, repeat('a',2048));
insert into tab1 values (6, repeat('a',2048));
insert into tab1 values (7, repeat('a',2048));
insert into tab1 values (13, repeat('a',2048));
insert into tab1 values (14, repeat('a',2048));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
update tab1 set b='' where a = 12;
update tab1 set b='' where a = 13;
update tab1 set b='' where a = 14;
update tab1 set b='' where a = 5;
update tab1 set b='' where a = 6;
update tab1 set b='' where a = 7;
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
update tab1 set b='' where a = 11;
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
update tab1 set b='' where a = 10;
# check page merge happens (MERGE_THRESHOLD=35 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
update tab1 set b='' where a = 9;
# check page merge happens (MERGE_THRESHOLD=25 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
DROP TABLE tab1;
#
# behavior for secondary index with blob
#
# test to confirm behavior (MERGE_THRESHOLD=50 (default))
CREATE TABLE tab1 (a bigint primary key, b blob) engine=InnoDB row_format=dynamic;
CREATE INDEX index1 ON tab1(b(750));
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab1 PRIMARY 50
test/tab1 index1 50
INSERT INTO tab1 VALUES (1, concat("01", repeat('a',8190)));
INSERT INTO tab1 VALUES (2, concat("02", repeat('a',8190)));
INSERT INTO tab1 VALUES (3, concat("03", repeat('a',8190)));
INSERT INTO tab1 VALUES (4, concat("04", repeat('a',8190)));
INSERT INTO tab1 VALUES (5, concat("05", repeat('a',8190)));
INSERT INTO tab1 VALUES (6, concat("06", repeat('a',8190)));
INSERT INTO tab1 VALUES (7, concat("07", repeat('a',8190)));
INSERT INTO tab1 VALUES (8, concat("08", repeat('a',8190)));
INSERT INTO tab1 VALUES (9, concat("09", repeat('a',8190)));
INSERT INTO tab1 VALUES (10, concat("10", repeat('a',8190)));
INSERT INTO tab1 VALUES (22, concat("22", repeat('a',8190)));
INSERT INTO tab1 VALUES (23, concat("23", repeat('a',8190)));
INSERT INTO tab1 VALUES (24, concat("24", repeat('a',8190)));
INSERT INTO tab1 VALUES (25, concat("25", repeat('a',8190)));
INSERT INTO tab1 VALUES (26, concat("26", repeat('a',8190)));
INSERT INTO tab1 VALUES (27, concat("27", repeat('a',8190)));
INSERT INTO tab1 VALUES (28, concat("28", repeat('a',8190)));
INSERT INTO tab1 VALUES (29, concat("29", repeat('a',8190)));
INSERT INTO tab1 VALUES (30, concat("30", repeat('a',8190)));
INSERT INTO tab1 VALUES (31, concat("31", repeat('a',8190)));
INSERT INTO tab1 VALUES (32, concat("32", repeat('a',8190)));
INSERT INTO tab1 VALUES (33, concat("33", repeat('a',8190)));
INSERT INTO tab1 VALUES (11, concat("11", repeat('a',8190)));
INSERT INTO tab1 VALUES (12, concat("12", repeat('a',8190)));
INSERT INTO tab1 VALUES (13, concat("13", repeat('a',8190)));
INSERT INTO tab1 VALUES (14, concat("14", repeat('a',8190)));
INSERT INTO tab1 VALUES (15, concat("15", repeat('a',8190)));
INSERT INTO tab1 VALUES (16, concat("16", repeat('a',8190)));
INSERT INTO tab1 VALUES (17, concat("17", repeat('a',8190)));
INSERT INTO tab1 VALUES (18, concat("18", repeat('a',8190)));
INSERT INTO tab1 VALUES (19, concat("19", repeat('a',8190)));
INSERT INTO tab1 VALUES (20, concat("20", repeat('a',8190)));
INSERT INTO tab1 VALUES (21, concat("21", repeat('a',8190)));
INSERT INTO tab1 VALUES (34, concat("34", repeat('a',8190)));
INSERT INTO tab1 VALUES (35, concat("35", repeat('a',8190)));
INSERT INTO tab1 VALUES (36, concat("36", repeat('a',8190)));
INSERT INTO tab1 VALUES (37, concat("37", repeat('a',8190)));
INSERT INTO tab1 VALUES (38, concat("38", repeat('a',8190)));
INSERT INTO tab1 VALUES (39, concat("39", repeat('a',8190)));
INSERT INTO tab1 VALUES (40, concat("40", repeat('a',8190)));
INSERT INTO tab1 VALUES (41, concat("41", repeat('a',8190)));
INSERT INTO tab1 VALUES (42, concat("42", repeat('a',8190)));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 42
4 2
27 21
28 21
begin;
delete from tab1 where a = 33;
delete from tab1 where a = 34;
delete from tab1 where a = 35;
delete from tab1 where a = 36;
delete from tab1 where a = 37;
delete from tab1 where a = 38;
delete from tab1 where a = 39;
delete from tab1 where a = 40;
delete from tab1 where a = 41;
delete from tab1 where a = 42;
delete from tab1 where a = 12;
delete from tab1 where a = 13;
delete from tab1 where a = 14;
delete from tab1 where a = 15;
delete from tab1 where a = 16;
delete from tab1 where a = 17;
delete from tab1 where a = 18;
delete from tab1 where a = 19;
delete from tab1 where a = 20;
delete from tab1 where a = 21;
commit;
InnoDB 0 transactions not purged
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 22
4 2
27 11
28 11
delete from tab1 where a = 32;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
delete from tab1 where a = 31;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=45 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 2
index_page_merge_successful 2
delete from tab1 where a = 30;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=40 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 2
index_page_merge_successful 2
DROP TABLE tab1;
# test to confirm behavior (MERGE_THRESHOLD=45)
CREATE TABLE tab1 (a bigint primary key, b blob) engine=InnoDB row_format=dynamic;
CREATE INDEX index1 ON tab1(b(750)) COMMENT 'MERGE_THRESHOLD=45';
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab1 PRIMARY 50
test/tab1 index1 45
INSERT INTO tab1 VALUES (1, concat("01", repeat('a',8190)));
INSERT INTO tab1 VALUES (2, concat("02", repeat('a',8190)));
INSERT INTO tab1 VALUES (3, concat("03", repeat('a',8190)));
INSERT INTO tab1 VALUES (4, concat("04", repeat('a',8190)));
INSERT INTO tab1 VALUES (5, concat("05", repeat('a',8190)));
INSERT INTO tab1 VALUES (6, concat("06", repeat('a',8190)));
INSERT INTO tab1 VALUES (7, concat("07", repeat('a',8190)));
INSERT INTO tab1 VALUES (8, concat("08", repeat('a',8190)));
INSERT INTO tab1 VALUES (9, concat("09", repeat('a',8190)));
INSERT INTO tab1 VALUES (10, concat("10", repeat('a',8190)));
INSERT INTO tab1 VALUES (22, concat("22", repeat('a',8190)));
INSERT INTO tab1 VALUES (23, concat("23", repeat('a',8190)));
INSERT INTO tab1 VALUES (24, concat("24", repeat('a',8190)));
INSERT INTO tab1 VALUES (25, concat("25", repeat('a',8190)));
INSERT INTO tab1 VALUES (26, concat("26", repeat('a',8190)));
INSERT INTO tab1 VALUES (27, concat("27", repeat('a',8190)));
INSERT INTO tab1 VALUES (28, concat("28", repeat('a',8190)));
INSERT INTO tab1 VALUES (29, concat("29", repeat('a',8190)));
INSERT INTO tab1 VALUES (30, concat("30", repeat('a',8190)));
INSERT INTO tab1 VALUES (31, concat("31", repeat('a',8190)));
INSERT INTO tab1 VALUES (32, concat("32", repeat('a',8190)));
INSERT INTO tab1 VALUES (33, concat("33", repeat('a',8190)));
INSERT INTO tab1 VALUES (11, concat("11", repeat('a',8190)));
INSERT INTO tab1 VALUES (12, concat("12", repeat('a',8190)));
INSERT INTO tab1 VALUES (13, concat("13", repeat('a',8190)));
INSERT INTO tab1 VALUES (14, concat("14", repeat('a',8190)));
INSERT INTO tab1 VALUES (15, concat("15", repeat('a',8190)));
INSERT INTO tab1 VALUES (16, concat("16", repeat('a',8190)));
INSERT INTO tab1 VALUES (17, concat("17", repeat('a',8190)));
INSERT INTO tab1 VALUES (18, concat("18", repeat('a',8190)));
INSERT INTO tab1 VALUES (19, concat("19", repeat('a',8190)));
INSERT INTO tab1 VALUES (20, concat("20", repeat('a',8190)));
INSERT INTO tab1 VALUES (21, concat("21", repeat('a',8190)));
INSERT INTO tab1 VALUES (34, concat("34", repeat('a',8190)));
INSERT INTO tab1 VALUES (35, concat("35", repeat('a',8190)));
INSERT INTO tab1 VALUES (36, concat("36", repeat('a',8190)));
INSERT INTO tab1 VALUES (37, concat("37", repeat('a',8190)));
INSERT INTO tab1 VALUES (38, concat("38", repeat('a',8190)));
INSERT INTO tab1 VALUES (39, concat("39", repeat('a',8190)));
INSERT INTO tab1 VALUES (40, concat("40", repeat('a',8190)));
INSERT INTO tab1 VALUES (41, concat("41", repeat('a',8190)));
INSERT INTO tab1 VALUES (42, concat("42", repeat('a',8190)));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 42
4 2
27 21
28 21
begin;
delete from tab1 where a = 33;
delete from tab1 where a = 34;
delete from tab1 where a = 35;
delete from tab1 where a = 36;
delete from tab1 where a = 37;
delete from tab1 where a = 38;
delete from tab1 where a = 39;
delete from tab1 where a = 40;
delete from tab1 where a = 41;
delete from tab1 where a = 42;
delete from tab1 where a = 12;
delete from tab1 where a = 13;
delete from tab1 where a = 14;
delete from tab1 where a = 15;
delete from tab1 where a = 16;
delete from tab1 where a = 17;
delete from tab1 where a = 18;
delete from tab1 where a = 19;
delete from tab1 where a = 20;
delete from tab1 where a = 21;
commit;
InnoDB 0 transactions not purged
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 22
4 2
27 11
28 11
delete from tab1 where a = 32;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
delete from tab1 where a = 31;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=45 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
delete from tab1 where a = 30;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=40 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 2
index_page_merge_successful 2
DROP TABLE tab1;
# test to confirm behavior (MERGE_THRESHOLD=40)
CREATE TABLE tab1 (a bigint primary key, b blob) engine=InnoDB row_format=dynamic;
CREATE INDEX index1 ON tab1(b(750)) COMMENT 'MERGE_THRESHOLD=40';
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab1 PRIMARY 50
test/tab1 index1 40
INSERT INTO tab1 VALUES (1, concat("01", repeat('a',8190)));
INSERT INTO tab1 VALUES (2, concat("02", repeat('a',8190)));
INSERT INTO tab1 VALUES (3, concat("03", repeat('a',8190)));
INSERT INTO tab1 VALUES (4, concat("04", repeat('a',8190)));
INSERT INTO tab1 VALUES (5, concat("05", repeat('a',8190)));
INSERT INTO tab1 VALUES (6, concat("06", repeat('a',8190)));
INSERT INTO tab1 VALUES (7, concat("07", repeat('a',8190)));
INSERT INTO tab1 VALUES (8, concat("08", repeat('a',8190)));
INSERT INTO tab1 VALUES (9, concat("09", repeat('a',8190)));
INSERT INTO tab1 VALUES (10, concat("10", repeat('a',8190)));
INSERT INTO tab1 VALUES (22, concat("22", repeat('a',8190)));
INSERT INTO tab1 VALUES (23, concat("23", repeat('a',8190)));
INSERT INTO tab1 VALUES (24, concat("24", repeat('a',8190)));
INSERT INTO tab1 VALUES (25, concat("25", repeat('a',8190)));
INSERT INTO tab1 VALUES (26, concat("26", repeat('a',8190)));
INSERT INTO tab1 VALUES (27, concat("27", repeat('a',8190)));
INSERT INTO tab1 VALUES (28, concat("28", repeat('a',8190)));
INSERT INTO tab1 VALUES (29, concat("29", repeat('a',8190)));
INSERT INTO tab1 VALUES (30, concat("30", repeat('a',8190)));
INSERT INTO tab1 VALUES (31, concat("31", repeat('a',8190)));
INSERT INTO tab1 VALUES (32, concat("32", repeat('a',8190)));
INSERT INTO tab1 VALUES (33, concat("33", repeat('a',8190)));
INSERT INTO tab1 VALUES (11, concat("11", repeat('a',8190)));
INSERT INTO tab1 VALUES (12, concat("12", repeat('a',8190)));
INSERT INTO tab1 VALUES (13, concat("13", repeat('a',8190)));
INSERT INTO tab1 VALUES (14, concat("14", repeat('a',8190)));
INSERT INTO tab1 VALUES (15, concat("15", repeat('a',8190)));
INSERT INTO tab1 VALUES (16, concat("16", repeat('a',8190)));
INSERT INTO tab1 VALUES (17, concat("17", repeat('a',8190)));
INSERT INTO tab1 VALUES (18, concat("18", repeat('a',8190)));
INSERT INTO tab1 VALUES (19, concat("19", repeat('a',8190)));
INSERT INTO tab1 VALUES (20, concat("20", repeat('a',8190)));
INSERT INTO tab1 VALUES (21, concat("21", repeat('a',8190)));
INSERT INTO tab1 VALUES (34, concat("34", repeat('a',8190)));
INSERT INTO tab1 VALUES (35, concat("35", repeat('a',8190)));
INSERT INTO tab1 VALUES (36, concat("36", repeat('a',8190)));
INSERT INTO tab1 VALUES (37, concat("37", repeat('a',8190)));
INSERT INTO tab1 VALUES (38, concat("38", repeat('a',8190)));
INSERT INTO tab1 VALUES (39, concat("39", repeat('a',8190)));
INSERT INTO tab1 VALUES (40, concat("40", repeat('a',8190)));
INSERT INTO tab1 VALUES (41, concat("41", repeat('a',8190)));
INSERT INTO tab1 VALUES (42, concat("42", repeat('a',8190)));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 42
4 2
27 21
28 21
begin;
delete from tab1 where a = 33;
delete from tab1 where a = 34;
delete from tab1 where a = 35;
delete from tab1 where a = 36;
delete from tab1 where a = 37;
delete from tab1 where a = 38;
delete from tab1 where a = 39;
delete from tab1 where a = 40;
delete from tab1 where a = 41;
delete from tab1 where a = 42;
delete from tab1 where a = 12;
delete from tab1 where a = 13;
delete from tab1 where a = 14;
delete from tab1 where a = 15;
delete from tab1 where a = 16;
delete from tab1 where a = 17;
delete from tab1 where a = 18;
delete from tab1 where a = 19;
delete from tab1 where a = 20;
delete from tab1 where a = 21;
commit;
InnoDB 0 transactions not purged
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 22
4 2
27 11
28 11
delete from tab1 where a = 32;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
delete from tab1 where a = 31;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=45 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
delete from tab1 where a = 30;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=40 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
DROP TABLE tab1;
# compressed table behaves same (MERGE_THRESHOLD=45)
CREATE TABLE tab1 (a bigint primary key, b blob) engine=InnoDB
ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=8;
CREATE INDEX index1 ON tab1(b(750)) COMMENT 'MERGE_THRESHOLD=45';
# check MERGE_THRESHOLD
select t.NAME as TABLE_NAME, i.NAME as INDEX_NAME, i.MERGE_THRESHOLD
from INFORMATION_SCHEMA.INNODB_SYS_TABLES t, INFORMATION_SCHEMA.INNODB_SYS_INDEXES i
where t.TABLE_ID = i.TABLE_ID and t.NAME like 'test/tab1%';
TABLE_NAME INDEX_NAME MERGE_THRESHOLD
test/tab1 PRIMARY 50
test/tab1 index1 45
INSERT INTO tab1 VALUES (1, concat("01", repeat('a',8190)));
INSERT INTO tab1 VALUES (2, concat("02", repeat('a',8190)));
INSERT INTO tab1 VALUES (3, concat("03", repeat('a',8190)));
INSERT INTO tab1 VALUES (4, concat("04", repeat('a',8190)));
INSERT INTO tab1 VALUES (5, concat("05", repeat('a',8190)));
INSERT INTO tab1 VALUES (6, concat("06", repeat('a',8190)));
INSERT INTO tab1 VALUES (7, concat("07", repeat('a',8190)));
INSERT INTO tab1 VALUES (8, concat("08", repeat('a',8190)));
INSERT INTO tab1 VALUES (9, concat("09", repeat('a',8190)));
INSERT INTO tab1 VALUES (10, concat("10", repeat('a',8190)));
INSERT INTO tab1 VALUES (22, concat("22", repeat('a',8190)));
INSERT INTO tab1 VALUES (23, concat("23", repeat('a',8190)));
INSERT INTO tab1 VALUES (24, concat("24", repeat('a',8190)));
INSERT INTO tab1 VALUES (25, concat("25", repeat('a',8190)));
INSERT INTO tab1 VALUES (26, concat("26", repeat('a',8190)));
INSERT INTO tab1 VALUES (27, concat("27", repeat('a',8190)));
INSERT INTO tab1 VALUES (28, concat("28", repeat('a',8190)));
INSERT INTO tab1 VALUES (29, concat("29", repeat('a',8190)));
INSERT INTO tab1 VALUES (30, concat("30", repeat('a',8190)));
INSERT INTO tab1 VALUES (31, concat("31", repeat('a',8190)));
INSERT INTO tab1 VALUES (32, concat("32", repeat('a',8190)));
INSERT INTO tab1 VALUES (33, concat("33", repeat('a',8190)));
INSERT INTO tab1 VALUES (11, concat("11", repeat('a',8190)));
INSERT INTO tab1 VALUES (12, concat("12", repeat('a',8190)));
INSERT INTO tab1 VALUES (13, concat("13", repeat('a',8190)));
INSERT INTO tab1 VALUES (14, concat("14", repeat('a',8190)));
INSERT INTO tab1 VALUES (15, concat("15", repeat('a',8190)));
INSERT INTO tab1 VALUES (16, concat("16", repeat('a',8190)));
INSERT INTO tab1 VALUES (17, concat("17", repeat('a',8190)));
INSERT INTO tab1 VALUES (18, concat("18", repeat('a',8190)));
INSERT INTO tab1 VALUES (19, concat("19", repeat('a',8190)));
INSERT INTO tab1 VALUES (20, concat("20", repeat('a',8190)));
INSERT INTO tab1 VALUES (21, concat("21", repeat('a',8190)));
INSERT INTO tab1 VALUES (34, concat("34", repeat('a',8190)));
INSERT INTO tab1 VALUES (35, concat("35", repeat('a',8190)));
INSERT INTO tab1 VALUES (36, concat("36", repeat('a',8190)));
INSERT INTO tab1 VALUES (37, concat("37", repeat('a',8190)));
INSERT INTO tab1 VALUES (38, concat("38", repeat('a',8190)));
INSERT INTO tab1 VALUES (39, concat("39", repeat('a',8190)));
INSERT INTO tab1 VALUES (40, concat("40", repeat('a',8190)));
INSERT INTO tab1 VALUES (41, concat("41", repeat('a',8190)));
INSERT INTO tab1 VALUES (42, concat("42", repeat('a',8190)));
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 42
4 2
27 21
28 21
begin;
delete from tab1 where a = 33;
delete from tab1 where a = 34;
delete from tab1 where a = 35;
delete from tab1 where a = 36;
delete from tab1 where a = 37;
delete from tab1 where a = 38;
delete from tab1 where a = 39;
delete from tab1 where a = 40;
delete from tab1 where a = 41;
delete from tab1 where a = 42;
delete from tab1 where a = 12;
delete from tab1 where a = 13;
delete from tab1 where a = 14;
delete from tab1 where a = 15;
delete from tab1 where a = 16;
delete from tab1 where a = 17;
delete from tab1 where a = 18;
delete from tab1 where a = 19;
delete from tab1 where a = 20;
delete from tab1 where a = 21;
commit;
InnoDB 0 transactions not purged
# check page merge happens (nothing is expected)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
select PAGE_NUMBER, NUMBER_RECORDS
from INFORMATION_SCHEMA.INNODB_SYS_TABLESPACES s1,
INFORMATION_SCHEMA.INNODB_BUFFER_PAGE s2
where s1.SPACE = s2.SPACE AND NAME like 'test/tab1%'
and PAGE_TYPE = "INDEX" order by PAGE_NUMBER, NUMBER_RECORDS;
PAGE_NUMBER NUMBER_RECORDS
3 22
4 2
27 11
28 11
delete from tab1 where a = 32;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=50 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 0
index_page_merge_successful 0
delete from tab1 where a = 31;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=45 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 1
index_page_merge_successful 1
delete from tab1 where a = 30;
InnoDB 0 transactions not purged
# check page merge happens (MERGE_THRESHOLD=40 causes merge here)
SELECT name,count_reset FROM information_schema.innodb_metrics
WHERE name like 'index_page_merge_%';
name count_reset
index_page_merge_attempts 2
index_page_merge_successful 2
DROP TABLE tab1;
SET GLOBAL innodb_purge_rseg_truncate_frequency = @saved_frequency;
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