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From "Damian Steer (Commented) (JIRA)" <>
Subject [jira] [Commented] (JENA-118) SDB can't concurrently write (duplicate key error)
Date Sun, 16 Oct 2011 22:32:11 GMT


Damian Steer commented on JENA-118:

DB2 and Oracle have a LOCK TABLE with similar semantics to postgresql, so I'll go ahead and
add those.
> SDB can't concurrently write (duplicate key error)
> --------------------------------------------------
>                 Key: JENA-118
>                 URL:
>             Project: Jena
>          Issue Type: Improvement
>          Components: SDB
>            Reporter: Damian Steer
>            Assignee: Damian Steer
>         Attachments: lock-pg.patch
>   Original Estimate: 96h
>  Remaining Estimate: 96h
> Multiple concurrent writes in SDB can break because duplicates can appear despite the
join-based duplicate suppression. Typically the users sees something like:
> org.postgresql.util.PSQLException: ERROR: duplicate key value violates unique constraint

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