mirror of
https://github.com/MariaDB/server.git
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d20a96f9c1
In MariaDB, we have a confusing problem where: * The transaction_isolation option can be set in a configuration file, but it cannot be set dynamically. * The tx_isolation system variable can be set dynamically, but it cannot be set in a configuration file. Therefore, we have two different names for the same thing in different contexts. This is needlessly confusing, and it complicates the documentation. The same thing applys for transaction_read_only. MySQL 5.7 solved this problem by making them into system variables. https://dev.mysql.com/doc/relnotes/mysql/5.7/en/news-5-7-20.html This commit takes a similar approach by adding new system variables and marking the original ones as deprecated. This commit also resolves some legacy problems related to SET STATEMENT and transaction_isolation.
123 lines
2.6 KiB
Text
123 lines
2.6 KiB
Text
SET GLOBAL transaction_isolation='REPEATABLE-READ';
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CREATE TABLE bug56680(
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a INT AUTO_INCREMENT PRIMARY KEY,
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b CHAR(1),
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c INT,
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INDEX(b))
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ENGINE=InnoDB STATS_PERSISTENT=0;
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INSERT INTO bug56680 VALUES(0,'x',1);
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BEGIN;
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SELECT b FROM bug56680;
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b
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x
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connect con1,localhost,root,,;
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connection con1;
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BEGIN;
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UPDATE bug56680 SET b='X';
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connection default;
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SELECT b FROM bug56680;
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b
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x
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SELECT * FROM bug56680;
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a b c
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1 x 1
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connection con1;
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ROLLBACK;
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disconnect con1;
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connection default;
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SELECT b FROM bug56680;
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b
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x
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SET GLOBAL transaction_isolation='READ-UNCOMMITTED';
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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INSERT INTO bug56680 SELECT 0,b,c FROM bug56680;
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BEGIN;
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SELECT b FROM bug56680 LIMIT 2;
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b
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x
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x
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connect con1,localhost,root,,;
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connection con1;
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BEGIN;
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DELETE FROM bug56680 WHERE a=1;
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INSERT INTO bug56680 VALUES(1,'X',1);
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SELECT b FROM bug56680 LIMIT 3;
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b
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X
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x
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x
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connection default;
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SELECT b FROM bug56680 LIMIT 2;
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b
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x
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x
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CHECK TABLE bug56680;
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Table Op Msg_type Msg_text
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test.bug56680 check status OK
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connection con1;
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ROLLBACK;
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SELECT b FROM bug56680 LIMIT 2;
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b
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x
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x
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CHECK TABLE bug56680;
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Table Op Msg_type Msg_text
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test.bug56680 check status OK
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connection default;
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disconnect con1;
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SELECT b FROM bug56680 LIMIT 2;
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b
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x
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x
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CREATE TABLE bug56680_2(
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a INT AUTO_INCREMENT PRIMARY KEY,
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b VARCHAR(2) CHARSET latin1 COLLATE latin1_german2_ci,
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c INT,
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INDEX(b))
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ENGINE=InnoDB STATS_PERSISTENT=0;
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INSERT INTO bug56680_2 SELECT 0,_latin1 0xdf,c FROM bug56680;
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BEGIN;
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SELECT HEX(b) FROM bug56680_2 LIMIT 2;
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HEX(b)
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DF
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DF
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DELETE FROM bug56680_2 WHERE a=1;
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INSERT INTO bug56680_2 VALUES(1,'SS',1);
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SELECT HEX(b) FROM bug56680_2 LIMIT 3;
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HEX(b)
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5353
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DF
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DF
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CHECK TABLE bug56680_2;
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Table Op Msg_type Msg_text
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test.bug56680_2 check status OK
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ALTER TABLE bug56680_2 ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=1;
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SELECT HEX(b) FROM bug56680_2 LIMIT 2;
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HEX(b)
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5353
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DF
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DELETE FROM bug56680_2 WHERE a=1;
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INSERT INTO bug56680_2 VALUES(1,_latin1 0xdf,1);
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SELECT HEX(b) FROM bug56680_2 LIMIT 3;
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HEX(b)
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DF
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DF
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DF
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CHECK TABLE bug56680_2;
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Table Op Msg_type Msg_text
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test.bug56680_2 check status OK
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# restart
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CHECK TABLE bug56680_2;
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Table Op Msg_type Msg_text
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test.bug56680_2 check status OK
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DROP TABLE bug56680_2;
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DROP TABLE bug56680;
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