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3e40f9a7f3
purge_sys_t::sees(): Wrapper for view.sees(). trx_purge_truncate_history(): Invoke purge_sys.sees() instead of comparing to head.trx_no, to determine if undo pages can be safely freed. The test innodb.cursor-restore-locking was adjusted by Vladislav Lesin, as was the the debug instrumentation in row_purge_del_mark(). Reviewed by: Vladislav Lesin
25 lines
870 B
Text
25 lines
870 B
Text
SET @saved_frequency = @@GLOBAL.innodb_purge_rseg_truncate_frequency;
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SET GLOBAL innodb_purge_rseg_truncate_frequency=1;
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InnoDB 0 transactions not purged
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#
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# MDEV-17793 Crash in purge after instant DROP and emptying the table
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#
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connect prevent_purge,localhost,root;
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START TRANSACTION WITH CONSISTENT SNAPSHOT;
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connection default;
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CREATE TABLE t1 (f1 INT, f2 INT) ENGINE=InnoDB;
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INSERT INTO t1 () VALUES ();
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ALTER TABLE t1 DROP f2, ADD COLUMN f2 INT;
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ALTER TABLE t1 DROP f1;
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DELETE FROM t1;
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connection prevent_purge;
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COMMIT;
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START TRANSACTION WITH CONSISTENT SNAPSHOT;
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connection default;
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ALTER TABLE t1 ADD COLUMN extra TINYINT UNSIGNED NOT NULL DEFAULT 42;
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SET GLOBAL innodb_max_purge_lag_wait=1;
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ALTER TABLE t1 DROP extra;
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disconnect prevent_purge;
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InnoDB 0 transactions not purged
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DROP TABLE t1;
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SET GLOBAL innodb_purge_rseg_truncate_frequency = @saved_frequency;
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