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-20854: ANALYZE for statements: not clear where the time is spent

Browse Source 
Count the "gap" time between table accesses and display it as
r_other_time_ms in the "table" element.

* The advantage of this approach is that it doesn't add any new
  my_timer_cycles() calls.
* The disadvantage is that the definition of what is done during
  "other time" is not that clear: it includes checking the WHERE
  (for this table), constructing index lookup tuple (for the next table)
  writing to GROUP BY temporary table (as we dont account for that time
  separately [yet], etc)
This commit is contained in:
Sergei Petrunia
2019-11-09 21:03:23 +03:00
parent 0117d0e65a
commit 68ed3a81f2
27 changed files with 448 additions and 206 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
mysql-test/main/except.test
View File

@ -13,9 +13,9 @@ EXPLAIN extended (select a,b from t1) except (select c,d from t2);
EXPLAIN extended select * from ((select a,b from t1) except (select c,d from t2)) a;
EXPLAIN format=json (select a,b from t1) except (select c,d from t2);
--replace_regex /"r_total_time_ms": [0-9e\.\-+]*,/"r_total_time_ms": "REPLACED",/
--source include/analyze-format.inc
ANALYZE format=json (select a,b from t1) except (select c,d from t2);
--replace_regex /"r_total_time_ms": [0-9e\.\-+]*,/"r_total_time_ms": "REPLACED",/
--source include/analyze-format.inc
ANALYZE format=json select * from ((select a,b from t1) except (select c,d from t2)) a;
select * from ((select a,b from t1) except (select c,d from t2)) a;
@ -45,9 +45,9 @@ EXPLAIN (select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4);
EXPLAIN extended select * from ((select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4)) a;
EXPLAIN format=json (select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4);
--replace_regex /"r_total_time_ms": [0-9e\.\-+]*,/"r_total_time_ms": "REPLACED",/
--source include/analyze-format.inc
ANALYZE format=json (select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4);
--replace_regex /"r_total_time_ms": [0-9e\.\-+]*,/"r_total_time_ms": "REPLACED",/
--source include/analyze-format.inc
ANALYZE format=json select * from ((select a,b,e,f from t1,t3) except
(select c,d,g,h from t2,t4)) a;
select * from ((select a,b,e,f from t1,t3) except (select c,d,g,h from t2,t4)) a;