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163b34fe25
Part of MDEV-5336 Implement LOCK FOR BACKUP The idea is that instead of waiting in close_cached_tables() for all tables to be closed, we instead call flush_tables() that does: - Flush not used objects in table cache to free memory - Collect all tables that are open - Call HA_EXTRA_FLUSH on the objects, to get them into "closed state" - Added HA_EXTRA_FLUSH support to archive and CSV - Added multi-user protection to HA_EXTRA_FLUSH in MyISAM and Aria The benefit compared to old code is: - FTWRL doesn't have to wait for long running read operations or open HANDLER's
25 lines
409 B
Text
25 lines
409 B
Text
CREATE TABLE t1(a INT NOT NULL) ENGINE=csv;
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INSERT INTO t1 VALUES(1);
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connect con1, localhost, root;
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LOCK TABLE t1 READ;
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connection default;
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FLUSH TABLES WITH READ LOCK;
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UNLOCK TABLES;
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# Must return 1 row
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SELECT * FROM t2;
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a
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1
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SELECT * FROM t1;
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a
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1
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connection con1;
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UNLOCK TABLES;
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connection default;
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INSERT INTO t2 VALUES(2);
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INSERT INTO t2 VALUES(2);
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SELECT * from t1,t2;
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a a
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1 1
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1 2
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1 2
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DROP TABLE t1, t2;
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