…improvements are possible especially on high IO pressure workloads. Q7: Does Innodb has any protection from …InnoDB has to wait. PZ: This one is a bummer. I thought Innodb will make sure to schedule synchronous wait… with the Linux kernel’s buffer pool. In high load situations where INNODB is using …
Post: SHOW INNODB STATUS walk through
July 17, 2006 By 40 Comments
… list of current waits. This section will only contain any entries if you’re running in high concurrency envinronment, so Innodb has to fall back to OS waits frequently. If wait was resolved via Spinlock…. On Unix/Linux you will always see 4 helper threads, on Windows it however can be adjusted by innodb_file_io_threads variable…
Post: Using LoadAvg for Performance Optimization
December 4, 2006 By 5 Comments
…Linux it is number of processes which are in “running” state or in “uninterruptable sleep” state which typically corresponds to disk IO… processes waiting on disk IO and … parallel or High if it …IO involved or if there are a lot of locks (table/row level locks) or other limiting factors such as innodb…
Post: MySQL 5.5 and MySQL 5.6 default variable values differences
February 21, 2013 By 8 Comments
…linux-glibc2. | | PERFORMANCE_SCHEMA_MAX_COND_INSTANCES | 1000 | 836 | | PERFORMANCE_SCHEMA_MAX_MUTEX_INSTANCES | 1000000 | 3282 | | OLD_PASSWORDS | OFF | 0 | | INNODB_STATS_ON_METADATA | ON | OFF | | PERFORMANCE_SCHEMA_EVENTS_WAITS_HISTORY_SIZE | 10 | 5 | | PERFORMANCE_SCHEMA_EVENTS_WAITS…high…
