Database Caching Issue (mysqli_num_fields())

  • Resolved akashmughal21

    (@akashmughal21)


    3 years, 7 months ago

    Hi,

    I am using W3TC plugin for 2 years on many of my sites and it is the best caching plugin.

    On one of my sites, I am using Database Caching for a long. However, recently I just noticed that a Warning appears on only a few of my blog posts after H1 and Meta.

    Warning: mysqli_num_fields() expects parameter 1 to be mysqli_result, bool given in /home/customer/www/templatesfreedownload.com/public_html/wp-includes/wp-db.php on line 3402

    Disabling the Database Caching resolves the issue. However, I want to use the Database caching feature as well. WOuld you please help me to resolve the issue without turning it off?

    Thanks.

Viewing 5 replies - 1 through 5 (of 5 total)
  • Plugin Contributor Marko Vasiljevic

    (@vmarko)

    Hello @akashmughal21

    I am sorry about the issue you are experiencing and I am happy to assist you with this.
    Can you please share if you are on a shared served or VPS/Dedicated and if the caching method you are using for DB caching is set to Disk?
    ALso, have you tried purging the DB Cache?
    Thanks!

    Thread Starter akashmughal21

    (@akashmughal21)

    Hi @vmarko,

    We are using a Shared Server and yes the caching method is set to Disk.

    Yes, I have tried purging all the caches again and again. Also, uninstalling and reinstalling the plugin. But nothing worked.

    Thanks!

    Plugin Contributor Marko Vasiljevic

    (@vmarko)

    Hello @akashmughal21

    Thank you for the info.

    WordPress website utilizes database quite a lot. And database caching allows decreasing database usage. Database caching allows to cache database request results.

    Database caching can make your site faster if the time needed to get data from the database is more than the time needed to get data from the cache.

    So, if you are on shared hosting, then memory-based caching is likely to be unavailable for you. And disk-based caching is not that efficient. In other words, if you are on shared hosting, it’s recommended not to use database caching.

    Moreover, using disk-database caching (on shared hosting) can make your site slower. This is so because getting data from the database can be faster than getting cached data from the disk.

    So I would advise disabling the Database cache in your case.

    Thanks!

    Thread Starter akashmughal21

    (@akashmughal21)

    Hi @vmarko

    Thanks for the detailed information.

    I have a Memcached feature available with my hosting plan.

    Do you recommend me to use Memcaching for Page, Object, and Database Caching?

    Thanks.

    Plugin Contributor Marko Vasiljevic

    (@vmarko)

    Hello @akashmughal21

    Yes, It’s best to use memory-based caching for DB and/or Object Caching.
    Thanks!

Viewing 5 replies - 1 through 5 (of 5 total)
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