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Oracle Database 11g’s Result Cache
Rob van Wijk
28 October 2010
Who am IRob van Wijk
• 15 years experience with Oracle products
Utrecht,Netherlands
• Database application developer
• From:
• Blog:
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Oracle Database 11g’s Result CacheTopics
• What is it?
• Demo how it works
• Demo some caveats
• Technical design considerations
Oracle Database 11g’s Result CacheDefinition
“A result cache is an area of memory, either in the SGA or client application memory, that
stores the result of a database query or query block for reuse.“
Oracle® Database Performance Tuning Guide Chapter 7.6
Oracle Database 11g’s Result CacheOverview SGA and Server Result Cache
System Global Area (SGA)
Shared Pool Database Buffer Cache
Large Pool
Other
Redo Log Buffer
Library Cache
DataDictionaryCache
OtherServerResultCache
ReservedPool
Oracle Database 11g’s Result Cache
D E M O
Robs Tourpoules
Technical design considerations
rc23.sql
Oracle Database 11g’s Result CacheTechnical design considerations
Which queries are ideal candidates?• Static source data• Process lots of data• Produce a smallish result set• Execute often• Limited number of parameters
Oracle Database 11g’s Result CacheTechnical design considerations
• Small lookup tables, like CG_REF_CODES?
rc21.sql
Oracle Database 11g’s Result CacheTechnical design considerations
Are denormalizations still necessary?
Oracle Database 11g’s Result CacheTechnical design considerations
Use it in your interface schemas?
ApplicationSchema
InterfaceSchema
Table
Table
Table
View
ExternalApplication
orWebsite
