Difference between revisions of "WebSphere and locking issues"
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| − | Using WebSphere on a Sybase ASE database can cause some | + | Using WebSphere on a Sybase ASE database can cause some problems with regard to locking in ASE. The default transaction isolation level for ASE is 1 (read committed), however the default behaviour of WebSphere is to use isolation level 2 (repeatable read). This has the effect that even rows that are read will be kept locked until the transaction has finished. In turn, this can lead to a high change of sessions blocking each other or the need to raise to ASE configuration parameter "number of locks" to a very high number (more than 1 million is not uncommon). |
To resolve this the WebSphere developers need to override the isolation level. | To resolve this the WebSphere developers need to override the isolation level. | ||
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dbcc pss(0,<spid>) | dbcc pss(0,<spid>) | ||
go | go | ||
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Look in the output for value after "pisolation" (somewhere halfway in the output). | Look in the output for value after "pisolation" (somewhere halfway in the output). | ||
[[Category:ASE]] | [[Category:ASE]] | ||
Revision as of 15:17, 17 March 2006
Using WebSphere on a Sybase ASE database can cause some problems with regard to locking in ASE. The default transaction isolation level for ASE is 1 (read committed), however the default behaviour of WebSphere is to use isolation level 2 (repeatable read). This has the effect that even rows that are read will be kept locked until the transaction has finished. In turn, this can lead to a high change of sessions blocking each other or the need to raise to ASE configuration parameter "number of locks" to a very high number (more than 1 million is not uncommon). To resolve this the WebSphere developers need to override the isolation level.
Note: to see what isolation level a running spid is using do this:
dbcc traceon(3604) go dbcc pss(0,<spid>) go
Look in the output for value after "pisolation" (somewhere halfway in the output).
