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BUG#47444 - --myisam_repair_threads>1can result in all

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index cardinalities=1

Parallel repair didn't poroperly update index cardinality
in certain cases.

When myisam_sort_buffer_size is not enough to store all
keys, index cardinality was updated before index was
actually written, when no index statistic is available.
This commit is contained in:
Sergey Vojtovich
2010-03-12 14:43:30 +04:00
parent cbfdc588e9
commit 4762eb64ec
3 changed files with 40 additions and 7 deletions
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19
mysql-test/r/myisam.result
View File

@@ -2389,4 +2389,23 @@ SELECT * FROM t1, t1 AS a1 WHERE t1.a=1 AND a1.a=1;
a a
1 1
DROP TABLE t1;
#
# BUG#47444 - --myisam_repair_threads>1can result in all index
# cardinalities=1
#
SET myisam_repair_threads=2;
SET myisam_sort_buffer_size=4096;
CREATE TABLE t1(a CHAR(255), KEY(a), KEY(a), KEY(a));
INSERT INTO t1 VALUES (0),(1),(2),(3),(4),(5),(6),(7),(8),(9),(0),(1),(2),(3);
REPAIR TABLE t1;
Table Op Msg_type Msg_text
test.t1 repair status OK
SELECT CARDINALITY FROM INFORMATION_SCHEMA.STATISTICS WHERE TABLE_SCHEMA='test' AND TABLE_NAME='t1';
CARDINALITY
14
14
14
DROP TABLE t1;
SET myisam_sort_buffer_size=@@global.myisam_sort_buffer_size;
SET myisam_repair_threads=@@global.myisam_repair_threads;
End of 5.1 tests