Object Cache and Transients Not Working

  • Seeing some very odd things on several installs of WordPress 4.6.1 with W3 Total Cache. Sites with object cache turned on a slowing to a crawl and causing higher than average loads on the servers and at the same time those sites cannot read or set any transient values. Once the object cache is turned off the sites and the servers return to normal. This is on sites and servers where object caching was previously working fine before the upgrade to WP 4.6.1.

    I have tested the sites that this seems to be affecting with all plugins disabled except W3 Total Cache and a Transient manager, but even with the transient manager disabled and some debugging echos turned on to test transients the transients and object cache seem to conflict in some way.

    As I gather more information I will come and post. If anyone has some advice on what might be going on here would be great to hear.

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  • Don’t enable the object cache unless you are using a form of memory cache.

    Thread Starter LGRIS

    (@lgris)

    While that might be a part of this it is not the main problem. The sites I have seen this on are a mix of both memory cache and disk cache. The memory cache ones are demonstrating the same issues with the object cache turned on. Transients are not working and the object cache is slow, much slower than it should be especially if it is using memory. Debugging appears to show that no objects at all are caching.

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