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InnoDB is the most similar storage engine for an Oracle developer. Understanding specifics such as the clustered primary key, secondary indexes sizes, page fill factor options and TEXT/BLOB management are important design needs developers need to know. Being able to monitor and analyze the available instrumentation and learn specifics for example auto-inc or gap locking contention, thread concurrency management options and data/log I/O options are also key in mastering InnoDB diagnostics.
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①innodb architecture②indexing curiosities③scaling issues④ops concerns⑤3p tools
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① InnoDB Architecture
MVCCrow level lockingtransactionsforeign keystablespacesundo logsredo logs
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the special sauce!
clustered indexingnatural orderpage directory
two short operational diversions
innodb_flush_method = O_DIRECTis worth benchmarking on your system.
choose smart primary keys
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② indexing curiosities
secondary indexes point to the clustered index
BLOB, VARCHAR, TEXT can be stored in overflow pages
ERROR HY000: Too big row.
③scaling issues
when it’s time togo big, where arethe bottlenecks?
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innodb locking
auto- incrementgap locking
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a view of locking in innotop
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concurrency
google: domas concurrency and click “I feel lucky!”
http://bit.ly/domas_inno_concurrency
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InnoDB thread concurrency
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balance between i/o capabilities and mutex contention
innodb_thread_concurrency
multi cores, faster disk work to be done
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④operational concerns
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④ operational concerns
mysql> show innodb status;
this gives you snapshot information
trending gives you framework to see when things are going wrong
http://code.google.com/p/mysql-cacti-templates
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indirect measures to see what is happening
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④ operational concerns
the combination of historical data with current status from the host is invaluable in determining cause
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④ operational concerns
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⑥free tools
InnotopMySQL proxy/ tcpdumpmysql-cacti-templatesgdb (poormansprofiler.org)
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additional resources
• irc.freenode.org– #mysql– #maatkit
• mysql.com• HPM2e -Baron Schwartz,
Peter Zaitsev, Vadim Tkachenko, and Jeremy Zawodny
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credits
flickr
• hk architecture – davelau• special sauce – fotoosvanrobin• yellow pages - f-r-a-n-k• Bell Labs - sodapop81• lock - darwinbell
• License plate - severud• voodoo - heungsub• clones - adactio• tools – meanestindian• console - hermzz
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Blue Gecko and contact info
• [email protected]• [email protected]• @sarahnovotny• @bluegecko• senk on #mysql
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Blue Gecko provides Remote DBA services for companies around the world
7x24x365 support including monitoring, performance analysis, proactive maintenance and architectural guidance for small and large datasets.
