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https://issues.apache.org/jira/browse/OAK-6789?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Reschke updated OAK-6789:
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Attachment: OAK-6789.diff
Potential fix that swiches to simpler but batched DELETEs instead.
> RDB: RevisionGC performance on Oracle
> -------------------------------------
>
> Key: OAK-6789
> URL: https://issues.apache.org/jira/browse/OAK-6789
> Project: Jackrabbit Oak
> Issue Type: Bug
> Components: rdbmk
> Reporter: Julian Reschke
> Assignee: Julian Reschke
> Attachments: OAK-6789.diff
>
>
> In RevisionGC on Oracle, performance of deletes is bad. Using RevisionGCTest:
> {noformat}
> VersionGCStats{ignoredGCDueToCheckPoint=false, canceled=false,
> deletedDocGCCount=92092 (of which leaf: 92000), updateResurrectedGCCount=0,
> splitDocGCCount=1, intermediateSplitDocGCCount=0, iterationCount=2,
> timeActive=7.429 min, timeToCollectDeletedDocs=1394 ms,
> timeToCheckDeletedDocs=250.4 ms, timeToSortDocIds=374.0 us,
> timeTakenToUpdateResurrectedDocs=17.00 us, timeTakenToDeleteDeletedDocs=7.399
> min, timeTakenToCollectAndDeleteSplitDocs=97.95 ms}
> Performed RevisionGC in 7,429 min
> {noformat}
> Compared with DB2:
> {noformat}
> VersionGCStats{ignoredGCDueToCheckPoint=false, canceled=false,
> deletedDocGCCount=96096 (of which leaf: 96000), updateResurrectedGCCount=0,
> splitDocGCCount=1, intermediateSplitDocGCCount=0, iterationCount=2,
> timeActive=8.240 s, timeToCollectDeletedDocs=1780 ms,
> timeToCheckDeletedDocs=259.7 ms, timeToSortDocIds=237.0 us,
> timeTakenToUpdateResurrectedDocs=19.00 us, timeTakenToDeleteDeletedDocs=4.552
> s, timeTakenToCollectAndDeleteSplitDocs=685.4 ms}
> Performed RevisionGC in 8,243 s
> {noformat}
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