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https://issues.apache.org/jira/browse/CONNECTORS-114?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karl Wright resolved CONNECTORS-114.
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       Resolution: Fixed
    Fix Version/s: ManifoldCF 0.3
         Assignee: Karl Wright

I have not yet made HSQLDB the official Derby replacement, but it is currently 
a better embedded option for many situations than Derby is.

> Derby seems too unstable in multithreaded situations to be a good database 
> for ManifoldCF, so try to add support for HSQLDB
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: CONNECTORS-114
>                 URL: https://issues.apache.org/jira/browse/CONNECTORS-114
>             Project: ManifoldCF
>          Issue Type: Bug
>          Components: Framework core
>            Reporter: Karl Wright
>            Assignee: Karl Wright
>             Fix For: ManifoldCF 0.3
>
>
> Derby seems to have multiple problems:
> (1) It has internal deadlocks, which even if caught cause poor performance 
> due to stalling (CONNECTORS-111);
> (2) It has no support for certain SQL constructs (CONNECTORS-109 and 
> CONNECTORS-110);
> (3) It locks up entirely for some people (CONNECTORS-100).
> HSQLDB has been recommended as another potential embedded database that might 
> work better.

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