On Apr 12, 2010, at 12:19 PM, Daniel Roy wrote:
Hi,
We are experiencing some strange behaviour from PostgreSQL and our
applications. Recently, various queries have started to exceed the
warn trace timeout set by
er.extensions.ERXAdaptorChannelDelegate.trace.milliSeconds.warn.
Some of the most basic select statements against a table with 3 rows
are taking upwards of 6 seconds to execute each,
Is that a simple select against one table, or are there joins to other
tables? If just a single table, it could be index corruption.
Dropping and re-creating the index should fix that. If there are
joins to other tables, you could be missing an index needed for
optimization.
Chuck
where they should easily be well under that. We set the warn flag
to 2.5 seconds.
A partial stacktrace is shown below:
java.lang.RuntimeException: Statement running too long
at
er
.extensions
.eof.ERXEOAccessUtilities.logExpression(ERXEOAccessUtilities.java:
1203)
at
er
.extensions
.eof
.ERXAdaptorChannelDelegate
.adaptorChannelDidEvaluateExpression(ERXAdaptorChannelDelegate.java:
88)
at sun.reflect.GeneratedMethodAccessor301.invoke(Unknown Source)
at
sun
.reflect
.DelegatingMethodAccessorImpl
.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at
com
.webobjects.foundation.NSSelector._safeInvokeMethod(NSSelector.java:
122)
at com.webobjects.foundation._NSDelegate._perform(_NSDelegate.java:
223)
at com.webobjects.foundation._NSDelegate.perform(_NSDelegate.java:
163)
at
com
.webobjects
.jdbcadaptor.JDBCChannel._evaluateExpression(JDBCChannel.java:377)
at
com
.webobjects
.jdbcadaptor.JDBCChannel.evaluateExpression(JDBCChannel.java:296)
at
com
.webobjects
.jdbcadaptor.JDBCChannel.selectAttributes(JDBCChannel.java:220)
at er.extensions.jdbc.ERXJDBCAdaptor
$Channel.selectAttributes(ERXJDBCAdaptor.java:150)
at
com
.webobjects
.eoaccess
.EODatabaseChannel
._selectWithFetchSpecificationEditingContext(EODatabaseChannel.java:
897)
at
com
.webobjects
.eoaccess
.EODatabaseChannel
.selectObjectsWithFetchSpecification(EODatabaseChannel.java:234)
at
com
.webobjects
.eoaccess
.EODatabaseContext
._objectsWithFetchSpecificationEditingContext(EODatabaseContext.java:
3055)
at
er
.extensions
.eof
.ERXDatabaseContext
._objectsWithFetchSpecificationEditingContext
(ERXDatabaseContext.java:57)
at
com
.webobjects
.eoaccess
.EODatabaseContext
.objectsWithFetchSpecification(EODatabaseContext.java:3195)
at
com
.webobjects
.eocontrol
.EOObjectStoreCoordinator
.objectsWithFetchSpecification(EOObjectStoreCoordinator.java:488)
at
com
.webobjects
.eocontrol
.EOEditingContext
.objectsWithFetchSpecification(EOEditingContext.java:4069)
at er.extensions.eof.ERXEC.objectsWithFetchSpecification(ERXEC.java:
1114)
at
com
.webobjects
.eocontrol
.EOEditingContext
.objectsWithFetchSpecification(EOEditingContext.java:4444)
at
com
.webobjects
.eoaccess.EOUtilities.objectWithPrimaryKey(EOUtilities.java:461)
at
com
.webobjects
.eoaccess.EOUtilities.objectWithPrimaryKeyValue(EOUtilities.java:432)
Has anyone experienced problems with PostgreSQL and basic statements
timing out? What might be the best way to troubleshoot this
problem? We have tried various JDBC driver versions, tuned the
PostgreSQL configuration, enabled ERXJDBCAdaptor.useConnectionBroker
and enabled 5 connections....
We have not changed the production PostgreSQL version (8.4.1)
recently, and we run the latest 5.4 Wonder frameworks from the
Hudson builds.
Daniel Roy
daniel....@fuegodigitalmedia.com
Software Developer
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--
Chuck Hill Senior Consultant / VP Development
Practical WebObjects - for developers who want to increase their
overall knowledge of WebObjects or who are trying to solve specific
problems.
http://www.global-village.net/products/practical_webobjects
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