…InnoDB has 2 limits for unflushed modified blocks in the buffer pool. The one is from physical size of the buffer pool. And the another one is oldness of the…
Post: Disaster: MySQL 5.5 Flushing
September 18, 2011 By 27 Comments
… case from the Oracle/MySQL engineers is to decrease “innodb_max_dirty_pages_pct”, this way InnoDB will try to keep less dirty pages in buffer pool… this may help ? InnoDB flushing may kick-in faster, and do not allow to have a lot of modified pages in buffer pool. Let’s…
Post: Effect of adaptive_flushing
December 4, 2009 By 5 Comments
…the innodb pages written graph (shown above). I suspect ZFS is heavily buffering writes during the“spiky flushing” period because the…the internet, and have good monitoring and trending tools in place from the…
Post: Connecting orphaned .ibd files
May 13, 2011 By 19 Comments
…InnoDB: Reading tablespace information from the .ibd files… InnoDB: Error: trying to add tablespace 15 of name ‘./sakila/customer.ibd’ InnoDB: to the…modified in the dictionary, but checksums are bad. To regenerate them use innochecksum from the…
Post: My Innodb Feature wishes
May 4, 2006 By 30 Comments
…innodb_file_per_table=1 allowing to flush all of modified tablespaces in the parallel. Multiple page…buffer management a bit but Innodb is already to deal with 2 page sizes by supporting compressed pages…
Post: Aligning IO on a hard disk RAID – the Benchmarks
June 9, 2011 By 13 Comments
…innodb_flush_log_at_trx_commit = 2 innodb_flush_method = O_DIRECT innodb_log_buffer_size = 8M innodb_buffer_pool_size = 128M innodb_log_file_size = 64M innodb…the same hardware, but with a misaligned IO. Here’s diskstats from the…
Comment: Jeremy Cole on MySQL Replication
June 14, 2006 By 12 Comments
… recorded in Innodb log files before COMMIT returns. The data pages are however modified only in the buffer pool. Dirty pages are flushed from the buffer pool in background. For Innodb flushes happen when log files are almost full and Innodb…
Post: Helgrinding MySQL with InnoDB for Synchronisation Errors, Fun and Profit
November 24, 2011 By 2 Comments
…The patch is a copy-paste-modify of the already existing Callgrind support and is not going to win any Cleanest Feature of the…innodb_plugin.innodb_bug53674. The…flush…The RW lock spin stats join the company of the buffer…
Post: Analyzing the distribution of InnoDB log file writes
July 16, 2010 By 5 Comments
…shell scripting, but the output from this was enough …the page isn’t in the OS buffer cache, then the write will cause a read-around write — the page will have to be read, modified…the link right now). This makes intuitive sense given that the writes are smaller than 4k. This server has innodb_flush…
Comment: Jeremy Cole on MySQL Replication
June 17, 2006 By 12 Comments
…flushing is aproximately correct. The data is modified directly in the buffer pool pages, which becomes “dirty” if there are some unflushed changes and later these pages… possibly out of sync with innodb transactional log. However it will …-xa/ – disabling XA saves you from extra fsync which allows to…
