database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-29 05:21:33 +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

3
mysql-test/main/explain_json_format_partitions.result
View File

@ -36,7 +36,8 @@ ANALYZE
"r_loops": 1,
"rows": 10,
"r_rows": 10,
"r_total_time_ms": "REPLACED",
"r_table_time_ms": "REPLACED",
"r_other_time_ms": "REPLACED",
"filtered": 100,
"r_filtered": 30,
"attached_condition": "t1.a in (2,3,4)"