… “cheat” as MySQL 5.5 uses for Innodb Buffer Pool and have multiple MySQL Query Cache instances … cache and there are multiple connection requesting the same item. What MySQL will do ? It will …MySQL Query Cache now stores queries in local memory, which is great however memory amount might be limited…
Post: MySQL Server Memory Usage
May 17, 2006 By 21 Comments
…are key_buffer_size, innodb_buffer_pool_size, innodb_additional_memory_pool_size, innodb_log_buffer_size,… left for your threads. Each thread connecting to MySQL server will needs its own buffers. About… you also should keep 32bit limits into account and probably limit “mysqld” size to about 2….
Post: Impact of the number of idle connections in MySQL
December 17, 2010 By 21 Comments
…log_at_trx_commit=0 max_connections = 10000 open_files_limit = 32768 The desktop is …connections” php ./make_conn.php $numconn & cat dbt2.sql | mysql -h 10.2.2.129 -u root dbt2 sleep 120 ./run_mysql… at the number active connections. For these benchmarks, I use pools of 4 connections, basically to …
Post: SimCity outages, traffic control and Thread Pool for MySQL
March 16, 2013 By 16 Comments
… be testing the Thread Pool feature in Percona Server for MySQL, and I saw a connection of how Thread Pool is supposed to help… Thread Pool for MySQL. We want to provide this kind of throughput: This is achieved by limiting the amount of working threads inside MySQL. So Thread Pool for MySQL does not improve the performance magically…
Comment: MySQL Limitations Part 4: One thread per connection
October 27, 2010 By 14 Comments
…connection pool issue you mention, it’s considered bad form to keep many unused connections in the pool…pools to drop them, say after 60 seconds and also to put an upper limit on the number of connections the pool… from PostgreSQL would be great in MySQL, though probably very hard to implement…
Comment: Impact of the number of idle connections in MySQL
December 29, 2010 By 21 Comments
… MySQL as its database. I noticed that MySQL connection establishment on each request limits the performance, so I am using a pool of already-established MySQL connections, also “unused” ones (by one thread) is reused later, so there are idle connections. Now I…
Post: How much memory can MySQL use in the worst case?
February 12, 2009 By 17 Comments
…_buffer_size + sort_buffer_size)*max_connections“. This was never true — not…the buffer pool. (There’s also an innodb_additional_mem_pool_size … OK, 0 rows affected (2.34 sec) mysql> select get_lock(@a, 1); +—————–+ | get_lock(@a, …things that have no defined limits. It’s not something that…
Post: MySQL 5.5.8 and Percona Server: being adaptive
December 20, 2010 By 25 Comments
… for log files (MySQL 5.5.8 has a 4GB limit). In additional to …mysql user=root socket=/var/lib/mysql/mysql.sock skip-grant-tables server_id=1 local_infile=1 datadir=/mnt/fio320 innodb_buffer_pool…max_connections=3000 query_cache_size=0 skip-name-resolve table_cache=10000 [mysql] socket=/tmp/mysql…
Post: Updated msl (microslow) patch, installation walk-through!
April 20, 2008 By 17 Comments
…-assembler’ ‘–enable-local-infile’ ‘–with-mysqld-user=mysql‘ ‘–with-unix-socket-path=/var/lib/mysql/mysql.sock’ ‘–with-pic’ ‘–prefix=/’ ‘–with-extra-charsets… -f – mysql-5.0.51a/ mysql-5.0.51a/bdb/ mysql-5.0.51a/bdb/Makefile.in mysql-5.0.51a/bdb/btree/ mysql-5… to work well if your application uses some kind of connection pooling. Rate limiting is disabled for the replication thread. Can be changed…
Post: Looking for RAID Controller without Battery Learning problems ?
January 5, 2012 By 11 Comments
… Cycle problems and its impact to MySQL Performance. Here are couple of links (… of internal and external hard drive connections they provide. Some Newer Adaptec Controllers…limit external drives : 0 Defunct disk drive count : 0 Logical devices/Failed/Degraded : 1/0/0 SSDs assigned to MaxIQ Cache pool…
