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Add recommendation on table_definition_cache #433

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Jean-Marie Renouard 2019-10-03 21:29:03 +02:00
parent a421f73e26
commit 143b80b3a6
2 changed files with 18 additions and 0 deletions
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1
INTERNALS.md
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@ -167,6 +167,7 @@
* Thread cache (=4)
* Thread cache hit ratio (>50%) if thread_handling is different of pools-of-threads
* Table cache hit ratio(>2°%)
* Table cache definition should be upper that total number of tables or in autoresizing mode
* Percentage of open file and open file limit(<85%)
* Percentage of table locks (<95%)
* Percentage of binlog cache lock (<90%)

17
mysqltuner.pl
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@ -3238,6 +3238,23 @@ sub mysql_stats {
}
}
# Table definition cache
my $nbtables=select_one('SELECT COUNT(*) FROM information_schema.tables');
if ( defined $myvar{'table_definition_cache'} ) {
if ( $myvar{'table_definition_cache'} == -1 ) {
infoprint ("table_definition_cache(".$myvar{'table_definition_cache'} .") is in autosizing mode");
} elsif ($myvar{'table_definition_cache'} < $nbtables ) {
badprint "table_definition_cache(".$myvar{'table_definition_cache'} .") is lower than number of tables($nbtables) ";
push( @adjvars,
"table_definition_cache(".$myvar{'table_definition_cache'} .") > " . $$nbtables . " or -1 (autosizing if supported)" );
}
else {
goodprint "table_definition_cache(".$myvar{'table_definition_cache'} .") is upper than number of tables($nbtables)";
}
} else {
infoprint "No table_definition_cache variable found.";
}
# Open files
if ( defined $mycalc{'pct_files_open'} ) {
if ( $mycalc{'pct_files_open'} > 85 ) {