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893472d005
The option innodb_rollback_segments was deprecated already in MariaDB Server 10.0. Its misleadingly named replacement innodb_undo_logs is of very limited use. It makes sense to always create and use the maximum number of rollback segments. Let us remove the deprecated parameter innodb_rollback_segments and deprecate&ignore the parameter innodb_undo_logs (to be removed in a later major release). This work involves some cleanup of InnoDB startup. Similar to other write operations, DROP TABLE will no longer be allowed if innodb_force_recovery is set to a value larger than 3.
58 lines
1.5 KiB
Plaintext
58 lines
1.5 KiB
Plaintext
SET @save_frequency = @@GLOBAL.innodb_purge_rseg_truncate_frequency;
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SET @save_truncate = @@GLOBAL.innodb_undo_log_truncate;
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SET GLOBAL innodb_undo_log_truncate = 0;
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SET GLOBAL innodb_purge_rseg_truncate_frequency = 1;
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SET @trunc_start=
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(SELECT variable_value FROM information_schema.global_status
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WHERE variable_name = 'innodb_undo_truncations');
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create table t1(keyc int primary key, c char(100)) engine = innodb;
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create table t2(keyc int primary key, c char(100)) engine = innodb;
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CREATE PROCEDURE populate_t1()
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BEGIN
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DECLARE i INT DEFAULT 1;
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while (i <= 20000) DO
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insert into t1 values (i, 'a');
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SET i = i + 1;
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END WHILE;
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END |
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CREATE PROCEDURE populate_t2()
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BEGIN
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DECLARE i INT DEFAULT 1;
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while (i <= 20000) DO
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insert into t2 values (i, 'a');
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SET i = i + 1;
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END WHILE;
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END |
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connect con1,localhost,root,,;
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begin;
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call populate_t1();
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connect con2,localhost,root,,;
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begin;
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call populate_t2();
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connection con1;
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update t1 set c = 'mysql';
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connection con2;
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update t2 set c = 'mysql';
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connection con1;
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update t1 set c = 'oracle';
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connection con2;
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update t2 set c = 'oracle';
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connection con1;
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delete from t1;
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connection con2;
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delete from t2;
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connection con1;
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SET GLOBAL innodb_undo_log_truncate = 1;
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commit;
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disconnect con1;
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connection con2;
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commit;
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disconnect con2;
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connection default;
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drop table t1, t2;
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drop PROCEDURE populate_t1;
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drop PROCEDURE populate_t2;
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InnoDB 0 transactions not purged
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SET GLOBAL innodb_purge_rseg_truncate_frequency = @save_frequency;
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SET GLOBAL innodb_undo_log_truncate = @save_truncate;
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