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Reducing memory when using information schema

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The background is that one user had a lot of views and using some complex
queries on information schema temporary memory of more than 2G was used.

- Added new element 'total_alloc' to MEM_ROOT for easier debugging.
- Added MAX_MEMORY_USED to information_schema.processlist.
- Added new status variable "Memory_used_initial" that shows how much MariaDB
  uses at startup. This gives the base value for "Memory_used".
- Reuse memory continuously for information schema queries instead of
  only freeing memory at query end.

Other things
- Removed some not needed set_notnull() calls for not null columns.
This commit is contained in:
Monty
2017-11-01 20:28:36 +02:00
parent 2ec7b87053
commit 9ec19b9b41
15 changed files with 274 additions and 219 deletions
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mysql-test/r/create.result
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@ -1173,6 +1173,7 @@ t1 CREATE TABLE `t1` (
`MAX_STAGE` tinyint(2) NOT NULL DEFAULT 0,
`PROGRESS` decimal(7,3) NOT NULL DEFAULT 0.000,
`MEMORY_USED` bigint(7) NOT NULL DEFAULT 0,
`MAX_MEMORY_USED` bigint(7) NOT NULL DEFAULT 0,
`EXAMINED_ROWS` int(7) NOT NULL DEFAULT 0,
`QUERY_ID` bigint(4) NOT NULL DEFAULT 0,
`INFO_BINARY` blob DEFAULT NULL,
@ -1196,6 +1197,7 @@ t1 CREATE TEMPORARY TABLE `t1` (
`MAX_STAGE` tinyint(2) NOT NULL DEFAULT 0,
`PROGRESS` decimal(7,3) NOT NULL DEFAULT 0.000,
`MEMORY_USED` bigint(7) NOT NULL DEFAULT 0,
`MAX_MEMORY_USED` bigint(7) NOT NULL DEFAULT 0,
`EXAMINED_ROWS` int(7) NOT NULL DEFAULT 0,
`QUERY_ID` bigint(4) NOT NULL DEFAULT 0,
`INFO_BINARY` blob DEFAULT NULL,