Documentation for Crowd 1.0. Documentation for other versions of Crowd is available too.

The default version of Crowd uses an embedded HSQL DB

Also see http://hsqldb.sourceforge.net/doc/guide/ch01.html#N101C2 .

HSQL DB periodically must update its files to represent changes made in the database. In doing so, it must delete the current crowddb.data file on the filesystem (beneath the /database folder) and replace it with a new one.

If an administrator issues a shutdown on Crowd in this period, data can be lost, and typically all configuration data for your Crowd server will be lost.

HSQLDB should not be used as a production database. It is included for evaluation purposes only.

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