database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-08-01 03:47:19 +03:00
Code Activity

MDEV-297: SHOW EXPLAIN: Server gets stuck until timeout occurs while executing SHOW

Browse Source 
INDEX and SHOW EXPLAIN in parallel
- Rework locking code to use the LOCK_thd_data mutex for all synchronization. This also
  fixed MDEV-301.
This commit is contained in:
Sergey Petrunya
2012-06-07 12:19:06 +04:00
parent 9a7b3bf4b7
commit 2c1e737c6c
6 changed files with 119 additions and 78 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
mysql-test/r/show_explain.result
View File

@ -596,4 +596,24 @@ count(*)
212
set debug_dbug='';
drop table t1;
#
# MDEV-297: SHOW EXPLAIN: Server gets stuck until timeout occurs while
# executing SHOW INDEX and SHOW EXPLAIN in parallel
#
CREATE TABLE t1(a INT, b INT, c INT, KEY(a), KEY(b), KEY(c));
INSERT INTO t1 (a) VALUES (3),(1),(5),(1);
set @show_explain_probe_select_id=1;
set debug_dbug='d,show_explain_probe_join_exec_start';
SHOW INDEX FROM t1;
show explain for $thr2;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE STATISTICS ALL NULL NULL NULL NULL NULL Skip_open_table; Scanned all databases
Warnings:
Note 1003 SHOW INDEX FROM t1
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a A NULL NULL NULL YES BTREE
t1 1 b 1 b A NULL NULL NULL YES BTREE
t1 1 c 1 c A NULL NULL NULL YES BTREE
set debug_dbug='';
DROP TABLE t1;
drop table t0;