… frequently you have purge not being the problem at all and when out of no where you can see purge thread being unable… is when problems often starts to happen. Now instead of purge thread simply operating in memory it has to perform IO which… as it can be controlled), using innodb_max_purge_lag or enable separate purge thread (or threads) via innodb_use_purge_thread if you’re running Percona Server…
Post: Multiple purge threads in Percona Server 5.1.56 and MySQL 5.6.2
May 3, 2011 By 13 Comments
… dedicated purge thread and in MySQL 5.6.2 one can have multiple dedicated purge threads. Percona Server 5.1 supports multiple purge threads too, although using… noise if no dedicated purge threads are used. We can see that the change has made difference and that the purge thread started working through…
Post: Tuning for heavy writing workloads
October 14, 2009 By 9 Comments
… updates from user threads on the all of other CPUs. XtraDB can increase the purge_threads from the next release. innodb_use_purge_thread = 4 seems….4-new (4 purge threads) The graphs show… The purge thread (> 0) helps to stabilize the throughput greatly. Increasing the purge threads can suppress the strong…
Post: Reasons for run-away main Innodb Tablespace
June 10, 2010 By 1 Comment
… this problem first you can use innodb_max_purge_lag to make a threads doing modifications slow down if purge thread can’t keep up… cases. If you’re running XtraDB you can also use innodb_use_purge_thread to use dedicated purge thread, which works a bit faster as it does… going from one thread so it has less chance for purge thread to fall behind, on other a lot of people use slave for…
Post: Percona Server 5.1.57-12.8 Stable Release
June 8, 2011 By 10 Comments
… value for innodb_use_purge_threads has been corrected to 32 (maximum number of parallel threads in a parallelized operation). The innodb_purge_thread patch accepted a value up to 64 for the innodb_use_purge_thread variable, leading…
Comment: Effect of adaptive_flushing
December 29, 2009 By 5 Comments
How about the result of XtraDB for the workload with settings †innodb_adaptive_flushing=OFF innodb_adaptive_checkpoint=estimate innodb_use_purge_thread=1 †? “estimate†is based on the different strategy, and it is not so much eagerly to flush…
Comment: Effect of adaptive_flushing
December 10, 2009 By 5 Comments
How about the result of XtraDB for the workload with settings ” innodb_adaptive_flushing=OFF innodb_adaptive_checkpoint=estimate innodb_use_purge_thread=1 ” ? “estimate” is based on the different strategy, and it is not so much eagerly to flush…
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
….commanual innodb_purge_batch_sizeblogpercona.commanual innodb_purge_threadsblogpercona.commanual …thread_concurrencyblogpercona.commanual innodb_thread_sleep_delayblogpercona.commanual Innodb_truncated_status_writesblogpercona.commanual innodb_use_native_aioblogpercona.commanual innodb_use…
Post: How to load large files safely into InnoDB with LOAD DATA INFILE
July 3, 2008 By 28 Comments
… the load — but from other transactions’ changes too; the purge thread cannot purge them, so everything gets bloated and slow. Even simple SELECT… scan through lots of obsolete, but not-yet-purged, row versions. Later, the purge thread will have to clean these up. This is… file and prints them to a fifo. Then we could use LOAD DATA INFILE on the fifo. Every million lines, the…
Post: MySQL 5.5.8 - in search of stability
January 3, 2011 By 11 Comments
…_pool_pages_free). This is the exact formula that InnoDB uses internally to estimate current innodb_dirty_pages_pct. checkpoint age…_io_threads = 16 innodb_write_io_threads = 16 innodb_purge_threads=1 innodb_adaptive_flushing=1 innodb_doublewrite=1 Please note that initially I used…_read_io_threads = 16 innodb_write_io_threads = 16 innodb_io_capacity=500 innodb_max_dirty_pages_pct = 60 innodb_purge_threads=1 innodb…
