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MDEV-21472: ALTER TABLE ... ANALYZE PARTITION ... with EITS reads and locks all rows

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Do not collect EITS statistics for this statement:

  ALTER TABLE t ANALYZE PARTITION p

EITS stats are currently global, not per-partition.
Collecting global stats when we are asked to process just one partition
causes issues for DBAs.
This commit is contained in:
Sergei Petrunia
2020-07-29 23:26:09 +03:00
parent e54a7ac1b3
commit 7e9ffc69ec
4 changed files with 71 additions and 4 deletions
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34
mysql-test/r/stat_tables_partition.result
View File

@ -9,5 +9,37 @@ ANALYZE TABLE t1;
Table Op Msg_type Msg_text
test.t1 analyze status Engine-independent statistics collected
test.t1 analyze status OK
SET use_stat_tables = DEFAULT;
DROP TABLE t1;
#
# MDEV-21472: ALTER TABLE ... ANALYZE PARTITION ... with EITS reads and locks all rows
#
CREATE TABLE t1 (
id int(11) auto_increment primary key,
c1 int(11) DEFAULT NULL
) PARTITION BY RANGE (id) (
PARTITION p0 VALUES LESS THAN (4),
PARTITION p1 VALUES LESS THAN MAXVALUE
);
insert into t1(c1) values (1),(1),(1),(1), (1),(1),(1),(1);
insert into t1(c1) select c1 from t1;
insert into t1(c1) select c1 from t1;
select count(*) from t1;
count(*)
32
select count(*) from t1 where id <4;
count(*)
3
flush status;
set session use_stat_tables='preferably';
# Must NOT show "Engine-independent statistics collected":
alter table t1 analyze partition p0;
Table Op Msg_type Msg_text
test.t1 analyze status OK
# Should not have Handler_read_rnd_next=34
show session status like 'Handler_read_rnd%';
Variable_name Value
Handler_read_rnd 0
Handler_read_rnd_deleted 0
Handler_read_rnd_next 0
drop table t1;
SET use_stat_tables = DEFAULT;