… When it starts handling queries after failover, the lower cache hit rates can lead to outages. Specifically, at Groupon, our …mysql-host 127.0.0.1 –mysql-username playback –mysql-password PaSSwOrd –mysql-schema schema_name –query-log-stdin –dispatcher-plugin thread-pool –thread-pool-threads…
Post: Virident vCache vs. FlashCache: Part 2
May 17, 2013 By 3 Comments
…time-based flushing consistently hit about 27000 per second… and, potentially, submaximal, rate compared to dirty-page…=95 \ –mysql-user=root –mysql-socket=/tmp/mysql.sock –mysql-table-engine=innodb…thread_cache_size = 1000 query_cache_size = 0 query_cache_type = 0 ft_min_word_len = 4 thread…
Post: What MySQL buffer cache hit rate should you target
June 29, 2006 By 5 Comments
…What cache hit rate is good for optimal MySQL Performance” is typical question I’m asked. It could by … be IO bould while showing very large hit rate so even taking data for single thread is not enough. So what should you… good was OS or SAN cache hit rate – something you would not see otherwise. The bad luck is – MySQL currently does not provide this…
Post: MySQL caching methods and tips
April 4, 2011 By 5 Comments
… of the MySQL query cache, since the rate of invalidation can not be controlled, and multiple cache entries …join operations are still CPU intensive and single threaded. In order to avoid these operations, the …cache is empty. When talking about cache, the miss path is at least as important as the hit…
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
…thread id 1148250464, thread declared inside InnoDB 442 mysql tables in use 1, locked 0 MySQL thread…are done to OS cache, and being sequential …hit rate of 995/1000. ————– ROW OPERATIONS ————– 0 queries inside InnoDB, 0 queries in queue 1 read views open inside InnoDB Main thread…
Post: Living with backups
November 6, 2008 By 28 Comments
…for no good reason. Since the hit ratio becomes worse as the cache is being filled with random …root/backup-tools/tar –read-rate=15000000 -C /mnt/snapshot -c -z -v -f – mysql | ssh backup@storage-host…is to check MySQL status every second and in case the number of connected threads goes above 50,…
