…. I am not able to find any information how memcached cache time expiry being apply into MySQL 5.6 memcached. e… cache life time as 12hours. Can this apply to the MySQL innodb memcache? i.e. will the cache being delete off innodb table after 12hours or they remain permanent? for doing cache clearing off table do i need…
Comment: MySQL Partitioning - can save you or kill you
April 30, 2013 By 45 Comments
… partitioned table, as, depending on the size of the partitions, the whole partition can be cached, as opposed to a single table, where probably only recently read records will be cached, resulting in more disc reads. 2. If you need to delete records from this table, those will be…
Post: More on MySQL transaction descriptors optimization
April 26, 2013 By Leave a Comment
…_per_table = true innodb_read_io_threads = 8 innodb_write_io_threads = 8 innodb_io_capacity = 2000 max_connections=5000 table_open_cache=5000 query_cache_type=OFF performance_schema=0 warmup To warmup server… –num-threads=<1..1024> –test=oltp.lua –oltp_tables_count=8 –oltp-table-size=1000000 –rand-init=on –report-interval=1 –rand…
Comment: MySQL caching methods and tips
March 27, 2013 By 5 Comments
… moments. I’m thinking to Cache the Database as my blog is Database-intensive. Using Cache for page only help a little… Hundred or millions of data in table, it maybe impossible. I wish there is solution to cache the database by server and…
Post: Is Synchronous Replication right for your app?
May 14, 2013 By 18 Comments
… with by fsyncing to memory (Battery or capacitor-backed write cache), etc., but the principle is basically the same. If we…. When a player makes an achievement, your application updates this table with a statement like this: UPDATE achievements SET count = count… application. These are maintained in separate tables and there also exists a users_groups table to define the relationship between them. When…
Post: Rotating MySQL slow logs safely
April 18, 2013 By 7 Comments
… my last post, I described a solution for keeping the caches of a MySQL standby server hot using MySQL slow logs… 65481 explains that the HUP signal also flushes tables in addition to logs. Flushing tables can impact running queries. Disable MySQL slow…
Post: table_cache negative scalability
November 16, 2009 By 23 Comments
… many tables you still see 100+ misses/sec while your data (at least table headers) is well cached so the cost of table cache miss is not very high, you may be better of with significantly reduced table cache… 5.1 – in this version table_cache was significantly redone and split in table_open_cache and table_definition_cache and I assumed the behavior may…
Post: More on table_cache
November 26, 2009 By 7 Comments
… sure all table cache entries are populated. When I tried repeatedly reading 1000 empty tables with table_cache of 20000 and 2000. With Table Cache of 2000… you can fit your tables in table cache and eliminate (or almost eliminate) table cache misses it is best to size table_cache large enough – even in…
Post: SHOW OPEN TABLES - what is in your table cache
December 14, 2008 By 3 Comments
… tables are in the table_cache this command is rather helpful to understand if there is activity on the given table. Just run “FLUSH TABLES mytable” and examine open tables later – if you see this table in table cache again chances are… all entries in the table_cache used, not grouped by the table, with thread_id using the table set (0 if table is not in…
Post: Query Profiling with MySQL: Bypassing caches
September 12, 2007 By 6 Comments
… is also table_cache both MySQL side and Internal Innodb one which can affect query execution speed. OS Caches Operation Systems typically cache file… MySQL Caches you can restart MySQL and this is the only way to clean all of the caches. You can do FLUSH TABLES to clean MySQL table cache (but not Innodb table meta data) or you can…
