…Check for Table Cache Related Allocations There are cases when MySQL will allocate a lot of memory for table cache, especially if … 0 DATA_LENGTH: 16384 INDEX_LENGTH: 0 CREATE_TIME: NULL UPDATE_TIME: NULL *************************** 2. row *************************** SESSION_ID: 7234 TABLE_SCHEMA: …
Post: Should we give a MySQL Query Cache a second chance ?
April 10, 2011 By 63 Comments
… multiple MySQL Query Cache instances hashed by query hash. It would help to reduce complexity dramatically. Fast Invalidation Right now when you update… set of applications. Many applications in MySQL have very large number of queries doing updates through primary key and use primary key…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
…MySQL manual, …cache_hitsblogpercona.commanual Ssl_session_cache_missesblogpercona.commanual Ssl_session_cache_modeblogpercona.commanual Ssl_session_cache_overflowsblogpercona.commanual Ssl_session_cache_sizeblogpercona.commanual Ssl_session_cache…_checksblogpercona.commanual updatable_views_with…
Post: Caching techinques
August 8, 2006 By 11 Comments
…often. Cache Invalidate With this apporach you invalidate or remove objects in cache once underlying information is updated. This is how MySQL Query Cache …if you cache is structured so each update removes only one object from the cache. Cache Update This one is quite similar to cache-invalidate …
Post: MySQL caching methods and tips
April 4, 2011 By 4 Comments
… some of the most common cache methods for MySQL. Popular cache methods The MySQL query cache When the query cache is enabled, MySQL examines each query to see if the contents have been stored in the query cache… each time (like a memcache miss) or they must be updated. Updating the summary tables efficiently is a hard problem to solve…
Post: Reasons for MySQL Replication Lag
July 29, 2011 By 6 Comments
… might be different and hence cache content. Replication Traffic Changes Changing in the replication traffic (what updates are being replicated) are frequent… involved. In could be even system which queries mysql. I’ve seen monitoring updates which would add excessively expensive and frequent query…
Post: Thoughts on MySQL Replication
July 7, 2006 By 18 Comments
… used only for absolutely critical updates. Third one is to use cache – something like memcached, besides pure caching it can be used to… to have data you’re accessing to be cached in memory by MySQL cache or OS cache. As slaves replicate the same data and often queried in random or round robin fashion their cache would…
Post: Cache Performance Comparison
August 9, 2006 By 73 Comments
… you do not get cache invalidated with each update) and ability to cache composed objects which may correspond to multiple MySQL queries. On Selecting from the table I should note MySQL… file cache to work you need file named “test” containing “MyTestString” 2) You need to create table test.test for MySQL Cache to…
Post: Multiple purge threads in Percona Server 5.1.56 and MySQL 5.6.2
May 3, 2011 By 13 Comments
…barracuda innodb_file_per_table max_connections=2000 table_cache=2000 Percona Server 5.1 Results For better …not to penalize further TPS. MySQL 5.6.2 Results Now let’s test MySQL 5.6.2. It is…of the scripts and results) and here are the updated 5.6.2 results. The difference against baseline 5…
Post: MySQL-Memcached or NOSQL Tokyo Tyrant - part 1
October 15, 2009 By 16 Comments
…all the vital stats for the game, be updated and stuffed back into the database. You would… this application I can then compare using MySQL to using MySQL + Memcached, and then to other solutions like… disk, expunge record 500,001, cache record 1 you keep overwriting the cache before you can use it….
