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Added a rule and notes about memcached as advised by Sheeri

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This commit is contained in:
Tyron Madlener 2011-08-11 12:45:17 +03:00
parent 0e62172c7d
commit 66107c8dff
1 changed files with 8 additions and 1 deletions
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9
libraries/advisory_rules.txt
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@ -124,9 +124,16 @@ rule 'Query cache disabled'
query_cache_size
value == 0 || query_cache_type == 'OFF' || query_cache_type == '0'
The query cache is not enabled.
The query cache is known to greatly improve performance if configured correctly. Enable it by setting {query_cache_size} to a 2 digit MiB value and setting {query_cache_type} to 'ON'
The query cache is known to greatly improve performance if configured correctly. Enable it by setting {query_cache_size} to a 2 digit MiB value and setting {query_cache_type} to 'ON'. <b>Note:</b> If you are using memcached, ignore this recommendation.
query_cache_size is set to 0 or query_cache_type is set to 'OFF'
rule 'memcached usage' [!fired('Query cache disabled')]
Questions / Uptime
value > 100
Suboptimal caching method.
You are using the MySQL Query cache with a fairly high traffic database. It might be worth considering to use <a href="http://dev.mysql.com/doc/refman/5.1/en/ha-memcached.html">memcached</a> instead of the MySQL Query cache, especially if you have multiple slaves.
The query cache is enabled and the server receives %d queries per second. This rule fires if there is more than 100 queries per second. | round(value,1)
rule 'Query cache efficiency (%)' [Com_select + Qcache_hits > 0 && !fired('Query cache disabled')]
Qcache_hits / (Com_select + Qcache_hits) * 100
value < 20