[ https://issues.apache.org/jira/browse/DERBY-6943?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16069356#comment-16069356 ]
Bryan Pendleton commented on DERBY-6943: ---------------------------------------- For the no-argument variant, I agree with Peter: process just the last (current) log. > Undefined behavior of SYSCS_DIAG.ERROR_LOG_READER() when using rolling log > files > -------------------------------------------------------------------------------- > > Key: DERBY-6943 > URL: https://issues.apache.org/jira/browse/DERBY-6943 > Project: Derby > Issue Type: Bug > Components: Services > Affects Versions: 10.13.1.1 > Reporter: Rick Hillegas > > The behavior of SYSCS_DIAG.ERROR_LOG_READER() is undefined when the engine is > booted with -Dderby.stream.error.style=rollingFile. At a minimum, it should > scan at least one of the rolling files. Instead, it raises an exception > saying that it can't find derby.log. > The following script shows this behavior: > {noformat} > connect 'jdbc:derby:memory:db;create=true'; > -- correctly succeeds if using ordinary diagnostic logging > -- INCORRECTLY RAISES 'No such file or directory' if > -Dderby.stream.error.style=rollingFile is set > SELECT count(*) FROM TABLE (SYSCS_DIAG.ERROR_LOG_READER()) AS T1; > -- correctly succeeds if using ordinary diagnostic logging > -- correctly raises 'No such file or directory' if > -Dderby.stream.error.style=rollingFile is set > SELECT count(*) FROM TABLE (SYSCS_DIAG.ERROR_LOG_READER('derby.log')) AS T1; > -- correctly raises 'No such file or directory' if using ordinary logging > -- correctly succeeds if -Dderby.stream.error.style=rollingFile is set > SELECT count(*) FROM TABLE (SYSCS_DIAG.ERROR_LOG_READER('derby-0.log')) AS T1; > {noformat} > We should decide on a correct behavior for SYSCS_DIAG.ERROR_LOG_READER() when > the -Dderby.stream.error.style=rollingFile property is set. Here are some > options: > 1) Scan all of the rolling diagnostic log files, starting at derby-0.log and > continuing through the last in the series. > 2) Scan just the first rolling diagnostic log file. > 3) Scan just the last (current) diagnostic log file. -- This message was sent by Atlassian JIRA (v6.4.14#64029)