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Marko Mäkelä f27e9c8947 MDEV-29694 Remove the InnoDB change buffer 
The purpose of the change buffer was to reduce random disk access,
which could be useful on rotational storage, but maybe less so on
solid-state storage.
When we wished to
(1) insert a record into a non-unique secondary index,
(2) delete-mark a secondary index record,
(3) delete a secondary index record as part of purge (but not ROLLBACK),
and the B-tree leaf page where the record belongs to is not in the buffer
pool, we inserted a record into the change buffer B-tree, indexed by
the page identifier. When the page was eventually read into the buffer
pool, we looked up the change buffer B-tree for any modifications to the
page, applied these upon the completion of the read operation. This
was called the insert buffer merge.

We remove the change buffer, because it has been the source of
various hard-to-reproduce corruption bugs, including those fixed in
commit 5b9ee8d819 and
commit 165564d3c3 but not limited to them.

A downgrade will fail with a clear message starting with
commit db14eb16f9 (MDEV-30106).

buf_page_t::state: Merge IBUF_EXIST to UNFIXED and
WRITE_FIX_IBUF to WRITE_FIX.

buf_pool_t::watch[]: Remove.

trx_t: Move isolation_level, check_foreigns, check_unique_secondary,
bulk_insert into the same bit-field. The only purpose of
trx_t::check_unique_secondary is to enable bulk insert into an
empty table. It no longer enables insert buffering for UNIQUE INDEX.

btr_cur_t::thr: Remove. This field was originally needed for change
buffering. Later, its use was extended to cover SPATIAL INDEX.
Much of the time, rtr_info::thr holds this field. When it does not,
we will add parameters to SPATIAL INDEX specific functions.

ibuf_upgrade_needed(): Check if the change buffer needs to be updated.

ibuf_upgrade(): Merge and upgrade the change buffer after all redo log
has been applied. Free any pages consumed by the change buffer, and
zero out the change buffer root page to mark the upgrade completed,
and to prevent a downgrade to an earlier version.

dict_load_tablespaces(): Renamed from
dict_check_tablespaces_and_store_max_id(). This needs to be invoked
before ibuf_upgrade().

btr_cur_open_at_rnd_pos(): Specialize for use in persistent statistics.
The change buffer merge does not need this function anymore.

btr_page_alloc(): Renamed from btr_page_alloc_low(). We no longer
allocate any change buffer pages.

btr_cur_open_at_rnd_pos(): Specialize for use in persistent statistics.
The change buffer merge does not need this function anymore.

row_search_index_entry(), btr_lift_page_up(): Add a parameter thr
for the SPATIAL INDEX case.

rtr_page_split_and_insert(): Specialized from btr_page_split_and_insert().

rtr_root_raise_and_insert(): Specialized from btr_root_raise_and_insert().

Note: The support for upgrading from the MySQL 3.23 or MySQL 4.0
change buffer format that predates the MySQL 4.1 introduction of
the option innodb_file_per_table was removed in MySQL 5.6.5
as part of mysql/mysql-server@69b6241a79
and MariaDB 10.0.11 as part of 1d0f70c2f8.

In the tests innodb.log_upgrade and innodb.log_corruption, we create
valid (upgraded) change buffer pages.

Tested by: Matthias Leich
2023-01-11 17:59:36 +02:00

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set global innodb_monitor_disable = All;
select name, if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics;
name status
metadata_table_handles_opened disabled
lock_deadlocks disabled
lock_timeouts disabled
lock_rec_lock_waits disabled
lock_table_lock_waits disabled
lock_rec_lock_requests disabled
lock_rec_lock_created disabled
lock_rec_lock_removed disabled
lock_rec_locks disabled
lock_table_lock_created disabled
lock_table_lock_removed disabled
lock_table_locks disabled
lock_row_lock_current_waits disabled
lock_row_lock_time disabled
lock_row_lock_time_max disabled
lock_row_lock_waits disabled
lock_row_lock_time_avg disabled
buffer_pool_size disabled
buffer_pool_reads disabled
buffer_pool_read_requests disabled
buffer_pool_write_requests disabled
buffer_pool_wait_free disabled
buffer_pool_read_ahead disabled
buffer_pool_read_ahead_evicted disabled
buffer_pool_pages_total disabled
buffer_pool_pages_misc disabled
buffer_pool_pages_data disabled
buffer_pool_bytes_data disabled
buffer_pool_pages_dirty disabled
buffer_pool_bytes_dirty disabled
buffer_pool_pages_free disabled
buffer_pages_created disabled
buffer_pages_written disabled
buffer_pages_read disabled
buffer_data_reads disabled
buffer_data_written disabled
buffer_flush_batch_scanned disabled
buffer_flush_batch_num_scan disabled
buffer_flush_batch_scanned_per_call disabled
buffer_flush_batch_total_pages disabled
buffer_flush_batches disabled
buffer_flush_batch_pages disabled
buffer_flush_neighbor_total_pages disabled
buffer_flush_neighbor disabled
buffer_flush_neighbor_pages disabled
buffer_flush_n_to_flush_requested disabled
buffer_flush_n_to_flush_by_age disabled
buffer_flush_adaptive_avg_time disabled
buffer_flush_adaptive_avg_pass disabled
buffer_LRU_get_free_loops disabled
buffer_LRU_get_free_waits disabled
buffer_flush_avg_page_rate disabled
buffer_flush_lsn_avg_rate disabled
buffer_flush_pct_for_dirty disabled
buffer_flush_pct_for_lsn disabled
buffer_flush_sync_waits disabled
buffer_flush_adaptive_total_pages disabled
buffer_flush_adaptive disabled
buffer_flush_adaptive_pages disabled
buffer_flush_sync_total_pages disabled
buffer_flush_sync disabled
buffer_flush_sync_pages disabled
buffer_flush_background_total_pages disabled
buffer_flush_background disabled
buffer_flush_background_pages disabled
buffer_LRU_batch_scanned disabled
buffer_LRU_batch_num_scan disabled
buffer_LRU_batch_scanned_per_call disabled
buffer_LRU_batch_flush_total_pages disabled
buffer_LRU_batch_evict_total_pages disabled
buffer_LRU_single_flush_failure_count disabled
buffer_LRU_get_free_search disabled
buffer_LRU_search_scanned disabled
buffer_LRU_search_num_scan disabled
buffer_LRU_search_scanned_per_call disabled
buffer_LRU_unzip_search_scanned disabled
buffer_LRU_unzip_search_num_scan disabled
buffer_LRU_unzip_search_scanned_per_call disabled
buffer_page_read_index_leaf disabled
buffer_page_read_index_non_leaf disabled
buffer_page_read_undo_log disabled
buffer_page_read_index_inode disabled
buffer_page_read_system_page disabled
buffer_page_read_trx_system disabled
buffer_page_read_fsp_hdr disabled
buffer_page_read_xdes disabled
buffer_page_read_blob disabled
buffer_page_read_zblob disabled
buffer_page_read_zblob2 disabled
buffer_page_read_other disabled
buffer_page_written_index_leaf disabled
buffer_page_written_index_non_leaf disabled
buffer_page_written_undo_log disabled
buffer_page_written_index_inode disabled
buffer_page_written_system_page disabled
buffer_page_written_trx_system disabled
buffer_page_written_fsp_hdr disabled
buffer_page_written_xdes disabled
buffer_page_written_blob disabled
buffer_page_written_zblob disabled
buffer_page_written_zblob2 disabled
buffer_page_written_other disabled
os_data_reads disabled
os_data_writes disabled
os_data_fsyncs disabled
os_pending_reads disabled
os_pending_writes disabled
os_log_bytes_written disabled
trx_rw_commits disabled
trx_ro_commits disabled
trx_nl_ro_commits disabled
trx_commits_insert_update disabled
trx_rollbacks disabled
trx_rollbacks_savepoint disabled
trx_rseg_history_len disabled
trx_undo_slots_used disabled
trx_undo_slots_cached disabled
trx_rseg_current_size disabled
purge_del_mark_records disabled
purge_upd_exist_or_extern_records disabled
purge_invoked disabled
purge_undo_log_pages disabled
purge_dml_delay_usec disabled
purge_stop_count disabled
purge_resume_count disabled
log_checkpoints disabled
log_lsn_last_flush disabled
log_lsn_last_checkpoint disabled
log_lsn_current disabled
log_lsn_checkpoint_age disabled
log_lsn_buf_pool_oldest disabled
log_max_modified_age_async disabled
log_waits disabled
log_write_requests disabled
log_writes disabled
compress_pages_compressed disabled
compress_pages_decompressed disabled
compression_pad_increments disabled
compression_pad_decrements disabled
compress_saved disabled
compress_pages_page_compressed disabled
compress_page_compressed_trim_op disabled
compress_pages_page_decompressed disabled
compress_pages_page_compression_error disabled
compress_pages_encrypted disabled
compress_pages_decrypted disabled
index_page_splits disabled
index_page_merge_attempts disabled
index_page_merge_successful disabled
index_page_reorg_attempts disabled
index_page_reorg_successful disabled
index_page_discards disabled
adaptive_hash_searches disabled
adaptive_hash_searches_btree disabled
adaptive_hash_pages_added disabled
adaptive_hash_pages_removed disabled
adaptive_hash_rows_added disabled
adaptive_hash_rows_removed disabled
adaptive_hash_rows_deleted_no_hash_entry disabled
adaptive_hash_rows_updated disabled
file_num_open_files disabled
innodb_master_thread_sleeps disabled
innodb_activity_count disabled
innodb_master_active_loops disabled
innodb_master_idle_loops disabled
innodb_log_flush_usec disabled
innodb_dict_lru_usec disabled
innodb_dict_lru_count_active disabled
innodb_dict_lru_count_idle disabled
innodb_dblwr_writes disabled
innodb_dblwr_pages_written disabled
innodb_page_size disabled
ddl_background_drop_indexes disabled
ddl_online_create_index disabled
ddl_pending_alter_table disabled
ddl_sort_file_alter_table disabled
ddl_log_file_alter_table disabled
icp_attempts disabled
icp_no_match disabled
icp_out_of_range disabled
icp_match disabled
set global innodb_monitor_enable = all;
select name from information_schema.innodb_metrics where not enabled;
name
set global innodb_monitor_enable = aaa;
ERROR 42000: Variable 'innodb_monitor_enable' can't be set to the value of 'aaa'
set global innodb_monitor_disable = All;
select name from information_schema.innodb_metrics where enabled;
name
set global innodb_monitor_reset_all = all;
select name from information_schema.innodb_metrics where count!=0;
name
set global innodb_monitor_enable = "%lock%";
select name from information_schema.innodb_metrics
where enabled != (name like "%lock%");
name
set global innodb_monitor_disable = "%lock%";
select name, if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name like "%lock%";
name status
lock_deadlocks disabled
lock_timeouts disabled
lock_rec_lock_waits disabled
lock_table_lock_waits disabled
lock_rec_lock_requests disabled
lock_rec_lock_created disabled
lock_rec_lock_removed disabled
lock_rec_locks disabled
lock_table_lock_created disabled
lock_table_lock_removed disabled
lock_table_locks disabled
lock_row_lock_current_waits disabled
lock_row_lock_time disabled
lock_row_lock_time_max disabled
lock_row_lock_waits disabled
lock_row_lock_time_avg disabled
set global innodb_monitor_enable = "%lock*";
ERROR 42000: Variable 'innodb_monitor_enable' can't be set to the value of '%lock*'
set global innodb_monitor_enable="%%%%%%%%%%%%%%%%%%%%%%%%%%%";
select name from information_schema.innodb_metrics where not enabled;
name
set global innodb_monitor_disable="%%%%%";
select name from information_schema.innodb_metrics where enabled;
name
set global innodb_monitor_enable="%";
select name from information_schema.innodb_metrics where not enabled;
name
set global innodb_monitor_disable="%_%";
select name from information_schema.innodb_metrics where enabled;
name
set global innodb_monitor_enable="log%%%%";
select name from information_schema.innodb_metrics
where enabled != (name like "log%");
name
set global innodb_monitor_enable="os_%a_fs_ncs";
set global innodb_monitor_enable="os%pending%";
select name, if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name like "os%";
name status
os_data_reads disabled
os_data_writes disabled
os_data_fsyncs enabled
os_pending_reads enabled
os_pending_writes enabled
os_log_bytes_written disabled
set global innodb_monitor_enable="";
ERROR 42000: Variable 'innodb_monitor_enable' can't be set to the value of ''
set global innodb_monitor_enable="_";
ERROR 42000: Variable 'innodb_monitor_enable' can't be set to the value of '_'
SET global innodb_monitor_disable = module_metadata;
SET global innodb_monitor_reset_all = module_metadata;
set global innodb_monitor_enable = metadata_table_handles_opened;
create table monitor_test(col int) engine = innodb;
select * from monitor_test;
col
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name = "metadata_table_handles_opened";
name max_count min_count count max_count_reset min_count_reset count_reset status
metadata_table_handles_opened 1 NULL 1 1 NULL 1 enabled
set global innodb_monitor_reset = metadata_table_handles_opened;
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name = "metadata_table_handles_opened";
name max_count min_count count max_count_reset min_count_reset count_reset status
metadata_table_handles_opened 1 NULL 1 NULL NULL 0 enabled
drop table monitor_test;
create table monitor_test(col int) engine = innodb;
select * from monitor_test;
col
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name = "metadata_table_handles_opened";
name max_count min_count count max_count_reset min_count_reset count_reset status
metadata_table_handles_opened 2 NULL 2 1 NULL 1 enabled
set global innodb_monitor_reset_all = metadata_table_handles_opened;
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name = "metadata_table_handles_opened";
name max_count min_count count max_count_reset min_count_reset count_reset status
metadata_table_handles_opened 2 NULL 2 1 NULL 1 enabled
set global innodb_monitor_disable = metadata_table_handles_opened;
set global innodb_monitor_reset = metadata_table_handles_opened;
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name = "metadata_table_handles_opened";
name max_count min_count count max_count_reset min_count_reset count_reset status
metadata_table_handles_opened 2 NULL 2 NULL NULL 0 disabled
drop table monitor_test;
create table monitor_test(col int) engine = innodb;
select * from monitor_test;
col
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name = "metadata_table_handles_opened";
name max_count min_count count max_count_reset min_count_reset count_reset status
metadata_table_handles_opened 2 NULL 2 NULL NULL 0 disabled
set global innodb_monitor_reset_all = metadata_table_handles_opened;
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name = "metadata_table_handles_opened";
name max_count min_count count max_count_reset min_count_reset count_reset status
metadata_table_handles_opened NULL NULL 0 NULL NULL 0 disabled
set global innodb_monitor_enable = metadata_table_handles_opened;
drop table monitor_test;
create table monitor_test(col int) engine = innodb stats_persistent=0;
select * from monitor_test;
col
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name like "metadata%";
name max_count min_count count max_count_reset min_count_reset count_reset status
metadata_table_handles_opened 1 NULL 1 1 NULL 1 enabled
set global innodb_monitor_disable = module_metadata;
set global innodb_monitor_reset = module_metadata;
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name like "metadata%";
name max_count min_count count max_count_reset min_count_reset count_reset status
metadata_table_handles_opened 1 NULL 1 NULL NULL 0 disabled
set global innodb_monitor_reset_all = module_metadata;
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name like "metadata%";
name max_count min_count count max_count_reset min_count_reset count_reset status
metadata_table_handles_opened NULL NULL 0 NULL NULL 0 disabled
set global innodb_monitor_enable = module_trx;
begin;
insert into monitor_test values(9);
commit;
begin;
insert into monitor_test values(9);
rollback;
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name='trx_rollbacks';
name max_count min_count count max_count_reset min_count_reset count_reset status
trx_rollbacks 1 NULL 1 1 NULL 1 enabled
set global innodb_monitor_disable = module_trx;
drop table monitor_test;
set global innodb_monitor_enable = file_num_open_files;
select name, max_count, min_count, count,
max_count_reset, min_count_reset, count_reset,
if(enabled,'enabled','disabled') status
from information_schema.innodb_metrics
where name like "file_num_open_files";
name max_count min_count count max_count_reset min_count_reset count_reset status
file_num_open_files # # # # # # enabled
set global innodb_monitor_disable = file_num_open_files;
set global innodb_monitor_enable = "icp%";
create table monitor_test(a char(3), b int, c char(2),
primary key (a(1), c(1)), key(b)) engine = innodb;
insert into monitor_test values("13", 2, "aa");
select a from monitor_test where b < 1 for update;
a
select name, count from information_schema.innodb_metrics
where name like "icp%";
name count
icp_attempts 1
icp_no_match 0
icp_out_of_range 1
icp_match 0
select a from monitor_test where b < 3 for update;
a
13
select name, count from information_schema.innodb_metrics
where name like "icp%";
name count
icp_attempts 2
icp_no_match 0
icp_out_of_range 1
icp_match 1
drop table monitor_test;
set global innodb_monitor_disable = All;
set global innodb_monitor_reset_all = all;
select 1 from `information_schema`.`INNODB_METRICS`
where case (1) when (1) then (AVG_COUNT_RESET) else (1) end;
1
set global innodb_monitor_enable = default;
set global innodb_monitor_disable = default;
set global innodb_monitor_reset = default;
set global innodb_monitor_reset_all = default;
#
# Bug#22576241 SETTING INNODB_MONITOR_ENABLE TO ALL DOES NOT ENABLE ALL
# MONITORS
#
CREATE TABLE t1 (a INT PRIMARY KEY) ENGINE=InnoDB STATS_PERSISTENT=0;
SELECT NAME, COUNT > 0 FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME
LIKE 'buffer_page_written_index_leaf';
NAME COUNT > 0
buffer_page_written_index_leaf 0
SET GLOBAL innodb_monitor_enable='module_buffer_page';
INSERT INTO t1 VALUES (1), (2), (3), (4);
FLUSH TABLES t1 FOR EXPORT;
UNLOCK TABLES;
SELECT NAME, COUNT > 0 FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME
LIKE 'buffer_page_written_index_leaf';
NAME COUNT > 0
buffer_page_written_index_leaf 1
SET GLOBAL innodb_monitor_disable='module_buffer_page';
SET GLOBAL innodb_monitor_reset_all='module_buffer_page';
SELECT NAME, COUNT > 0 FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME
LIKE 'buffer_page_written_index_leaf';
NAME COUNT > 0
buffer_page_written_index_leaf 0
SET GLOBAL innodb_monitor_enable='%';
INSERT INTO t1 VALUES (5), (6), (7), (8);
FLUSH TABLES t1 FOR EXPORT;
UNLOCK TABLES;
SELECT NAME, COUNT > 0 FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME
LIKE 'buffer_page_written_index_leaf';
NAME COUNT > 0
buffer_page_written_index_leaf 1
SET GLOBAL innodb_monitor_disable='%';
SET GLOBAL innodb_monitor_reset_all='%';
SELECT NAME, COUNT > 0 FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME
LIKE 'buffer_page_written_index_leaf';
NAME COUNT > 0
buffer_page_written_index_leaf 0
SET GLOBAL innodb_monitor_enable='ALL';
INSERT INTO t1 VALUES (9), (10), (11), (12);
FLUSH TABLES t1 FOR EXPORT;
UNLOCK TABLES;
SELECT NAME, COUNT > 0 FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME
LIKE 'buffer_page_written_index_leaf';
NAME COUNT > 0
buffer_page_written_index_leaf 1
DROP TABLE t1;
CREATE TABLE fl0 (
id INT NOT NULL PRIMARY KEY
) ENGINE = InnoDB;
CREATE TABLE fl1 (
id INT NOT NULL PRIMARY KEY,
fl0_id INT,
CONSTRAINT `fkl0`
FOREIGN KEY (fl0_id) REFERENCES fl0 (id)
ON DELETE CASCADE
ON UPDATE RESTRICT
) ENGINE = InnoDB;
CREATE TABLE fl2 (
id INT NOT NULL PRIMARY KEY,
fl1_id INT,
CONSTRAINT `fkl1`
FOREIGN KEY (fl1_id) REFERENCES fl1 (id)
ON DELETE CASCADE
ON UPDATE SET NULL
) ENGINE = InnoDB;
INSERT INTO fl0 VALUES (1000);
INSERT INTO fl1 VALUES (500, 1000), (1500, 1000);
INSERT INTO fl2 VALUES (200, 500), (800, 500), (1200, 1500), (1800, 1500);
CREATE TABLE t1(id INT PRIMARY KEY, a INT, b CHAR(1), UNIQUE KEY u(a,b))
ENGINE=InnoDB;
SET @start = (SELECT COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME
= 'lock_rec_lock_created');
BEGIN;
INSERT INTO t1 VALUES(1,1,'a'),(2,9999,'b'),(3,10000,'c'),(4,4,'d');
DELETE FROM t1 WHERE a = 9999 AND b='b';
COMMIT;
SET @end = (SELECT COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME
= 'lock_rec_lock_created');
SELECT @end - @start;
@end - @start
1
# Records must not be S/X-locked if a table is X-locked.
SET @start = @end;
SET autocommit = 0;
BEGIN;
LOCK TABLE t1 WRITE;
SELECT * FROM t1;
id a b
1 1 a
4 4 d
3 10000 c
SELECT * FROM t1 WHERE a>=10000;
id a b
3 10000 c
SELECT * FROM t1 FOR UPDATE;
id a b
1 1 a
4 4 d
3 10000 c
SELECT * FROM t1 WHERE a>=10000 FOR UPDATE;
id a b
3 10000 c
UPDATE t1 SET b = 'b' WHERE id = 4;
UPDATE t1 SET b = 'b' WHERE a = 10000;
REPLACE INTO t1 VALUES (4,3,'a');
INSERT INTO t1 VALUES (3,1,'e') ON DUPLICATE KEY UPDATE b = 'b';
INSERT INTO t1 VALUES (5,5,'e');
DELETE FROM t1 WHERE a = 1 AND b='a';
DELETE FROM t1;
COMMIT;
UNLOCK TABLES;
SET @end = (SELECT COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME = 'lock_rec_lock_created');
SELECT @end - @start;
@end - @start
0
# Records must not be S-locked if a table is S-locked.
SET @start = @end;
BEGIN;
LOCK TABLE t1 WRITE;
INSERT INTO t1 VALUES(1,1,'a'),(2,9999,'b'),(3,10000,'c'),(4,4,'d');
DELETE FROM t1 WHERE a = 9999 AND b='b';
COMMIT;
UNLOCK TABLES;
BEGIN;
LOCK TABLE t1 READ;
SELECT * FROM t1 LOCK IN SHARE MODE;
id a b
1 1 a
4 4 d
3 10000 c
SELECT * FROM t1 WHERE a>=10000 LOCK IN SHARE MODE;
id a b
3 10000 c
COMMIT;
UNLOCK TABLES;
SET @end = (SELECT COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME = 'lock_rec_lock_created');
SELECT @end - @start;
@end - @start
0
# Records must not be S-locked for foreign keys enforcement
SET @start = @end;
BEGIN;
LOCK TABLE fl0 READ, fl1 READ, fl2 WRITE;
INSERT INTO fl2 VALUES (300, 500), (700, 500), (1300, 1500), (1700, 1500);
SELECT * FROM fl1 LOCK IN SHARE MODE;
id fl0_id
500 1000
1500 1000
COMMIT;
UNLOCK TABLES;
SET @end = (SELECT COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME = 'lock_rec_lock_created');
SELECT @end - @start;
@end - @start
0
# Records must not be X-locked for foreign keys cascade
SET @start = @end;
BEGIN;
LOCK TABLE fl0 READ, fl1 WRITE, fl2 WRITE;
DELETE FROM fl1 WHERE id = 1500;
UPDATE fl1 SET id = 2500 WHERE id = 500;
COMMIT;
UNLOCK TABLES;
SET @end = (SELECT COUNT FROM INFORMATION_SCHEMA.INNODB_METRICS WHERE NAME = 'lock_rec_lock_created');
SELECT @end - @start;
@end - @start
0
SET autocommit = default;
DROP TABLE t1;
DROP TABLE fl2;
DROP TABLE fl1;
DROP TABLE fl0;
SET GLOBAL innodb_monitor_enable=default;
SET GLOBAL innodb_monitor_disable=default;
SET GLOBAL innodb_monitor_reset_all=default;
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