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Problem: Statements that write to tables with auto_increment columns
based on the selection from another table, may lead to master
and slave going out of sync, as the order in which the rows
are retrieved from the table may differ on master and slave.
Solution: We mark writing to a table with auto_increment table
based on the rows selected from another table as unsafe. This
will cause the execution of such statements to throw a warning
and forces the statement to be logged in ROW if the logging
format is mixed.
Changes:
1. All the statements that writes to a table with auto_increment
column(s) based on the rows fetched from another table, will now
be unsafe.
2. CREATE TABLE with SELECT will now be unsafe.
54 lines
1.0 KiB
Plaintext
54 lines
1.0 KiB
Plaintext
include/master-slave.inc
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[connection master]
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call mtr.add_suppression('Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT');
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drop table if exists t1,t2;
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CREATE TABLE t1 (
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a int unsigned not null auto_increment primary key,
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b int unsigned
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) ENGINE=MyISAM;
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CREATE TABLE t2 (
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a int unsigned not null auto_increment primary key,
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b int unsigned
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) ENGINE=MyISAM;
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INSERT INTO t1 VALUES (NULL, 0);
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INSERT INTO t1 SELECT NULL, 0 FROM t1;
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INSERT INTO t2 VALUES (NULL, 0), (NULL,1);
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SELECT * FROM t1 ORDER BY a;
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a b
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1 0
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2 0
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SELECT * FROM t2 ORDER BY a;
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a b
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1 0
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2 1
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UPDATE t1, t2 SET t1.b = (t2.b+4) WHERE t1.a = t2.a;
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SELECT * FROM t1 ORDER BY a;
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a b
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1 4
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2 5
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SELECT * FROM t2 ORDER BY a;
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a b
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1 0
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2 1
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SELECT * FROM t1 ORDER BY a;
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a b
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1 4
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2 5
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SELECT * FROM t2 ORDER BY a;
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a b
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1 0
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2 1
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drop table t1,t2;
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reset master;
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CREATE TABLE t1 ( a INT );
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INSERT INTO t1 VALUES (0);
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UPDATE t1, (SELECT 3 as b) AS x SET t1.a = x.b;
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select * from t1;
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a
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3
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select * from t1;
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a
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3
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drop table t1;
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include/rpl_end.inc
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