SET @old_innodb_enable_xap_unlock_unmodified_for_primary_debug=
@@GLOBAL.innodb_enable_xap_unlock_unmodified_for_primary_debug; SET GLOBAL innodb_enable_xap_unlock_unmodified_for_primary_debug= 1; SET @saved_dbug = @@GLOBAL.debug_dbug;
CREATE TABLE t(id INT PRIMARY KEY) ENGINE=InnoDB STATS_PERSISTENT=0;
InnoDB 0 transactions not purged
INSERT INTO t VALUES (10), (20), (30);
connect prevent_purge,localhost,root,,;
start transaction with consistent snapshot;
connection default;
DELETE FROM t WHERE id = 20; SET @@GLOBAL.debug_dbug= "+d,enable_row_purge_remove_clust_if_poss_low_sync_point";
XA START '1';
UPDATE t SET id=40 WHERE id=30;
XA END '1';
connection prevent_purge;
COMMIT; SET DEBUG_SYNC= 'now WAIT_FOR row_purge_remove_clust_if_poss_low_before_delete'; SET @@GLOBAL.debug_dbug= "-d,enable_row_purge_remove_clust_if_poss_low_sync_point";
connection default; SET DEBUG_SYNC= "lock_rec_unlock_unmodified_start SIGNAL lock_sys_latched WAIT_FOR cont";
XA PREPARE '1';
connection prevent_purge; SET DEBUG_SYNC= 'now SIGNAL row_purge_remove_clust_if_poss_low_cont'; SET DEBUG_SYNC= 'now SIGNAL cont';
disconnect prevent_purge;
connection default;
XA COMMIT '1'; SET DEBUG_SYNC="RESET";
TRUNCATE TABLE t;
InnoDB 0 transactions not purged
INSERT INTO t VALUES (10), (20), (30);
connect prevent_purge,localhost,root,,;
start transaction with consistent snapshot;
connection default;
DELETE FROM t WHERE id = 20; SET @@GLOBAL.debug_dbug= "+d,enable_row_purge_remove_clust_if_poss_low_sync_point"; SET @@GLOBAL.debug_dbug="+d,skip_lock_release_on_prepare_try";
XA START '1';
UPDATE t SET id=40 WHERE id=30;
XA END '1';
connection prevent_purge;
COMMIT; SET DEBUG_SYNC= 'now WAIT_FOR row_purge_remove_clust_if_poss_low_before_delete'; SET @@GLOBAL.debug_dbug= "-d,enable_row_purge_remove_clust_if_poss_low_sync_point";
connection default; SET DEBUG_SYNC= "lock_rec_unlock_unmodified_start SIGNAL lock_sys_latched WAIT_FOR cont";
XA PREPARE '1';
connection prevent_purge; SET DEBUG_SYNC= 'now SIGNAL row_purge_remove_clust_if_poss_low_cont'; SET DEBUG_SYNC= 'now SIGNAL cont';
disconnect prevent_purge;
connection default;
XA COMMIT '1'; SET DEBUG_SYNC="RESET";
TRUNCATE TABLE t; SET @@GLOBAL.debug_dbug = @saved_dbug;
DROP TABLE t; SET GLOBAL innodb_enable_xap_unlock_unmodified_for_primary_debug=
@old_innodb_enable_xap_unlock_unmodified_for_primary_debug;
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.11 Sekunden
(vorverarbeitet am 2026-10-08)
¤
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