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Well considering it is the slow part of XOOPS MySql system, unsure
Normally it will store what users are doing on the siteā¦
Make sure all files are there for Xoops, as it should keep a record of who is online and where people are in the system.
the faster Xoops_session runs the faster your site, can retrieve anybodies position whilst surfing the site.
Yet if all installed ok and everything works ok, then it should contain data when people are surfing.