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I have multiple mediawiki installations, and I'm wondering if it's safe to allow them to all use the same memcached server.

Are there any "gotchas" involved?

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The cache keys are prefixed by the database name and table prefix (or more specifically, $wgCachePrefix or if not specified wfWikiId()), so if all wikis use different database names/table prefixes then there should be no problems.

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