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database cache question

Megunticook — Thu, 26 Oct 2023 16:28:42 +0000

Hi,

I’m trying to optimize my website for performance and have a question about the database cache.

On my development site, when I run the W3TC setup guide, it indicates memcached as the best choice for database cacheing.

Normally I get the same result on my production site. But today I was doing some testing and noticed the setup guide is telling me to disable the db cache because both memcached and disk options are much slower. See screenshot below (production site on top, development site below).

What do you make of this? Any idea why suddenly the database cache is so slow on the production site but not the dev site? Only difference in setup is that the production site has a remote db server while the development site has a local database right on the web server. Production is also using a CDN.

You think I should just disable db cache on my production site? Seems counter intuitive…

Website slow after using W3 Total Cache

nextlabs — Fri, 09 Jun 2023 04:45:51 +0000

We have been using the free version of the Total Cache plugin. We utilize a CDN, Object Cache, and Database Cache by connecting to a memcached cluster in AWS. We are also taking advantage of minify and other common options. However, when we disable the object cache and database features of W3C Total Cache, we notice a significant improvement of at least 2 seconds in load time. This is contrary to what should happen, as it is supposed to speed up the website.

We are considering subscribing to the paid version, but we need to identify the root cause of this issue before making a decision.

Understanding Database Cache and Object Cache

industrialmarketing — Tue, 30 May 2023 11:40:53 +0000

Hi. We used a fully managed shared server and I have just installed W3 Total Cache on many of the websites we manage. I am struggling to understand fully about Database Cache and Object Cache and my question is this:

When testing Database Cache and Object Cache, if “Disk” is faster than “none”, should I select it?

Thanks very much

URGENT – memcache issue after update

bethgee — Thu, 07 Apr 2022 08:08:55 +0000

After completing updates, I was seeing the following error –

The following memcached servers are not responding or not running:

    Object Cache: 127.0.0.1:11211.
    Database Cache: 127.0.0.1:11211.

This message will automatically disappear once the issue is resolved.

I tried changing Database Cache to Disk – my plan was to save as Disk and then put it back to Memcache – except now I can no longer choose Memcache as the Database Cache Method!!!

Please help!

Issue W3 memcached servers are not responding or not running “Database Cache”

___ripa___ — Thu, 03 Mar 2022 13:42:38 +0000

I incurred an issue after i updated plugins and worpress version:

The following memcached servers are not responding or not running:
Database Cache: 127.0.0.1:11211
This message will automatically disappear once the issue is resolved.

Don’t know how to solve it, and i’ve not access to the server terminal.
Any suggestion? Thanks in advance

Memcached not running

Elano — Wed, 07 Jul 2021 15:32:04 +0000

Hi since the latest update I have this message on all my 3 websites.

`The following memcached servers are not responding or not running:

Database Cache: 127.0.0.1:11211.

This message will automatically disappear once the issue is resolved.`

– Memcached is running on my server
– I use PhP 7.4
– Didn’t have the problem before the update
– All the 3 websites are on 3 different servers but all on the same hosting service (O2siwtch)

I don’t know what to do I tried to change the IP adress and port but so far nothing worked.

Help with understanding Object and Database Cache

cloudantswvestjens — Thu, 18 Jun 2020 09:39:06 +0000

I’d like some information regarding the Object and Database Caches.

We are managing a WordPress installation for one of our customers, however once we enable W3TC and configure the Object and Database Caches (with Redis as backend, 3-server cluster setup) the performance does something funny: Instead of being lower than before, enabling W3TC + object/db cache increases the load by a factor of 4.

How do these caches work under the hood? What do they do? Are there certain plugins or certain ways things can be programmed in which case they should not be used?

CPU/memory/hardware should not be a limitation, it’s a 3-server setup running HAProxy, Varnish (currently not caching) and Apache MPM preforked with Redis as caching backend.

Looking forward to your feedback.

object cache support for shared hosting?

Mfa — Sun, 12 Apr 2020 03:40:36 +0000

hi, i love litespeed cache. amazing! Litespeed cache does great work. however, it needs redis and memcaches on object cache. Redis and memcache are not supported for shared hosting! especially database cache is needed. I made great optimization with litespeed server and litespeed cache. You may notice the [ redundant link removed ] speed. but sql queries still slow down the site. I’m looking for a great solution. Can litespeed share the way to support database cache in shared hosting?

(sorry for my english. I’m using translate)

Redis Error message

b8europe — Thu, 31 Jan 2019 11:40:59 +0000

If I turn on Redis for Database cache I get the following messages with WP in Debug mode:

Notice: Undefined index: options in ./wp-content/plugins/w3-total-cache/Cache_Redis.php on line 181

Notice: Undefined index: remaining in ./wp-content/plugins/w3-total-cache/Cache_Redis.php on line 181

Notice: Undefined index: comments in ./wp-content/plugins/w3-total-cache/Cache_Redis.php on line 181

Notice: Undefined index: singletables in ./wp-content/plugins/w3-total-cache/Cache_Redis.php on line 181

Database Cache accessing incorrect database

MakeAnImpact — Tue, 31 Jul 2018 12:48:36 +0000

Ran into an issue where information saved on one site was showing up on another. It was extremely weird, but if I disabled the W3 Total Cache plugin everything worked fine.

After further investigation, here were the issues/environment:

– Cloud Dedicated Server (Linux, Apache, PHP-FPM)
– Using Memcache
– Database Cache enabled (using Memcache)
– Sites affected were installed in different directories on the same domain & cPanel account
– Even if we migrated the sites to their own domains and cPanel accounts, we still experienced the issue
– Single WP installs, not multisite
– The onset of these issues was intermittent, and didn’t occur on all sites at any specific interval, but once it started the only way to fix was to disable W3 Total Cache.
– .htaccess was getting modified with incorrect site redirect info
– Logging into one site would redirect you to a different site, logged in, even if your credentials weren’t for that site.

I assume it has something to do with memcache, and somehow the plugin is looking to the wrong database for information. It just seems like this shouldn’t happen under any circumstances, but it did.