…” width=”247″] Percona Server for MySQL version 5.6.11-60…..3 release notes. Bugs Fixed: Transaction objects are now allocated calling … the log reads needlessly, potentially limiting performance on write-intensive workloads. Bug…too fast around 500KB tablespace size. Bug fixed #1169494. Fixed the …
Post: More on MySQL transaction descriptors optimization
April 26, 2013 By Leave a Comment
…MySQL transaction descriptors optimization introduced in Percona …transactions optimization in MySQL 5.6 virtually eliminates contention on the mutex protecting the list of transactions, its applicability is quite limited…log_buffer_size = 16M innodb_buffer_pool_size = 52G innodb_log_file_size = 2000M…
Post: Galera Flow Control in Percona XtraDB Cluster for MySQL
May 2, 2013 By 5 Comments
…limit defaults to 16 transactions. This effectively means that this is as far as a given node can be behind committing transactions…cluster might be: mysql> set global wsrep_provider_options=”gcs.fc_limit=500; … of certification depends only the size of the transactions, which translates into number …
Post: Ultimate MySQL variable and status reference list
January 8, 2011 By 4 Comments
… referring to the amazing MySQL manual, especially the option and variable reference table….table_sizeblogpercona.commanual tmpdirblogpercona.commanual transaction_alloc_block_sizeblogpercona.commanual transaction_isolationblogpercona.commanual transaction_prealloc_sizeblogpercona.commanual tx_…
Post: Innodb row size limitation
April 7, 2011 By 12 Comments
…variable length columns and the complete row size exceeds this limit, InnoDB chooses variable length columns for …to run any multi table update in a transaction. It will also impact both read and modification … can limit the changes to your application if you choose XML as format and you use MySQL‘s…
Post: How Percona does a MySQL Performance Audit
November 24, 2008 By 17 Comments
… mining stock market transactions,” or whatever the …mysql> show global variables like ‘%table_size%’; +———————+———–+ | Variable_name | Value | +———————+———–+ | max_heap_table_size | 268435456 | | tmp_table_size…. The stock MySQL server’s limitation of one-…
Post: Can we improve MySQL variable handling ?
February 18, 2012 By 8 Comments
…size 16777216 tmpdir /tmp transaction-alloc-block-size 8192 transaction-isolation REPEATABLE-READ transaction-prealloc-size 4096 updatable-views-with-limit…
Post: Modeling MySQL Capacity by Measuring Resource Consumptions
March 8, 2011 By 1 Comment
… resources system has will place a limit on amount of queries system can…a look at procfs for MySQL process: root@ubuntu:/var/log/mysql# cat /proc/19018/…: 0 OTHER_COMMANDS: 0 COMMIT_TRANSACTIONS: 181243 ROLLBACK_TRANSACTIONS: 0 DENIED_CONNECTIONS: 0 LOST_…99 0 32.65k 0 # Query size 294.90M 14 783 158….
Post: Multiple MySQL instances on Fusion-io ioDrive
October 7, 2011 By 6 Comments
… that MySQL due internal limitations is not able to utilize all CPU and …MySQL instances, 600 warehouses (55GB of data) each, 32GB buffer pool each The purpose of different combination of data and memory sizes…sec long run, gathering data for New Order Transaction each 10 seconds. That is, for each …
Post: 10+ Ways to Crash or Overload MySQL
November 13, 2007 By 20 Comments
… been normally treated very quickly by MySQL. The moment you give someone access to MySQL Server, all MySQL Security guarantees is you can… by killing transactions which are too old though proper solution would be implementing some form of limit on undo segment size. Another possibility…
