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Adjust table_open_cache to avoid getting error 24 (too many open files)

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MDEV--15609 engines/funcs.crash_manytables_number crashes with error 24
           (too many open files)
MDEV-10286  Adjustment of table_open_cache according to system limits
            does not work when open-files-limit option is provided

Fixed by adjusting tc_size downwards if there is not enough file
descriptors to use.

Other changes:
- Ensure that there is 30 (was 10) extra file descriptors for other usage
- Decrease TABLE_OPEN_CACHE_MIN to 200 as it's better to have a smaller
  table cache than getting error 24
- Increase minimum of max_connections and table_open_cache from 1 to 10
  as 1 is not usable for any real application, only for testing.
This commit is contained in:
Monty
2018-03-22 20:03:54 +02:00
parent 4d83b01537
commit ca0c96fc89
29 changed files with 193 additions and 85 deletions
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4
mysql-test/r/variables.result
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@@ -748,10 +748,10 @@ Warnings:
Warning 1292 Truncated incorrect table_open_cache value: '-1'
SHOW VARIABLES LIKE 'table_open_cache';
Variable_name Value
table_open_cache 1
table_open_cache 10
SELECT * FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME LIKE 'table_open_cache';
VARIABLE_NAME VARIABLE_VALUE
TABLE_OPEN_CACHE 1
TABLE_OPEN_CACHE 10
SET GLOBAL table_open_cache=DEFAULT;
set character_set_results=NULL;
select ifnull(@@character_set_results,"really null");