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Superchaging big production systems on Firebird: transactions, garbage, maintenance
1.
© IBSurgeon 2011 SUPERCHARGING
BIG PRODUCTION SYSTEMS ON FIREBIRD: TRANSACTIONS, GARBAGE, MA INTENANCE Dmitry Kuzmenko, IBSurgeon
2.
© IBSurgeon 2011 What
is big? • 10 users, 1gb database? • 100 users, 1gb database? • 5 users, 100gb database? • Any system, that have performance problems
3.
© IBSurgeon 2011 Steps
to tune performance 1. Hardware 1. Processor, Memory, Disks 2. Virtual machines 2. Transactions 3. Versioning 4. Queries • Everything need to be able logged and monitored
4.
© IBSurgeon 2011 Transactions •
What is happening in the system • What about transaction control in applications (good/bad) • Are there unnecessary active transactions
5.
© IBSurgeon 2011 IBTM:
Transactions monitoring
6.
© IBSurgeon 2011 Active
transactions
7.
© IBSurgeon 2011 Versioning •
Do we need to set sweep interval to 0? • If yes, when it’s better to run gfix –sweep ? • Where versions are, and how much • What is garbage? • What is the cause of versions?
8.
© IBSurgeon 2011 IBAnalyst
9.
© IBSurgeon 2011
10.
© IBSurgeon 2011
11.
© IBSurgeon 2011 What
business logic causes versions grow? • Understandable via special UDFs • Udf writes some parameters to some file • Udfs are called in INSERT/UPDATE/DELETE triggers on tables, that we want to monitor. • UDFs can be called from procedures to understand begin/end of logic block • Intensity can be analyzed by file size • Timestamps and blocks can help to understand logic • Trace API
12.
© IBSurgeon 2011 Queries •
How many queries my application produce? • Does all queries correct and even necessary (obsolete/wrong functionality)? • Which queries take too much time? • How query execution time degrades (if yes)?
13.
© IBSurgeon 2011 FBScanner
14.
© IBSurgeon 2011 1
day, 84 computers, up to 1350 transactions per minute, up to 3200 statements per minute, longest query - 50 seconds
15.
© IBSurgeon 2011 1
application/user monitored up to 85 transactions per minute (?), up to 4200 sql-operators per minute (???)
16.
© IBSurgeon 2011 What
observer can discover? • Users use not only one instance of application • Application runs unnecessary queries • Application use wrong transaction control • Users use application not the way it was designed by developers
17.
© IBSurgeon 2011
18.
© IBSurgeon 2011 What
to do next • Ajust (fix) transaction management in applications • Remove unnecessary write transactions • Fix duration of transactions • Legacy applications, lazy users • Garbage • Drop unnecessary indices • If source is available - fix business logic • Closed source and legacy applications – require special maintenance schedule • Queries • Fix plans or change queries • create/drop indices • Try to use stored aggregates
19.
© IBSurgeon 2011 Summary •
IBSurgeon’s supercharge service is based on IBTM, IBAnalyst and FBScanner, to identify and fix problems with transactions, garbage and maintenance • Tools are available to be adopted by any experienced Firebird professional Special offer: –25% for conference attendees till December 31 support@ib-aid.com www.ib-aid.com
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