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Anyone recommends an alternative to set_transient that persists the data for the whole duration of the expiration even when object cache is enabled?

Example:

  • List item
  • Set a long-duration transient set_transient('foo', 'bar', WEEK_IN_SECONDS);
  • Site is using object cache, so this is saved in memory
  • I don't know internals of Redis, but memory cache is cleared for some reason:
    • Redis rotates cache based on the eviction policy
    • Server reboots
    • O.S-level memory management frees up memory
    • etc?

Now that transient expired before 1 week.

In a scenario such as this, how can I create a value that is able to persist for a longer period?

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I eventually used a combination of update_option and WP Cron:

// Create the option. update_option('foo', 'bar', false); /** * Schedule it to be deleted one week from now. * * @param int Expiration timestamp * @param string Hook that will be invoked * @param string Params to send to the hook callback */ wp_schedule_single_event( time() + WEEK_IN_SECONDS, 'expire_option', [ 'foo' ] ); // Register the hook. add_action( 'expire_option', 'expire_option_callback', 10, 1 ); // This will be called by WP Cron when we want to "expire" the option, one week after its creation. function expire_option_callback( $option_name ) { delete_option( $option_name ); }

The only drawback is that the option won't be expired if WP Cron is not working in the site. If this is unnaceptable, you'll need a more robust solution mimicking how transients are saved and expired in the DB.

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  • +1, transients by definition are not reliable storage. As for cron, you can trust it working otherwise some other things will not work as well. The other alternative is to store a time stamp as part of the option, like it is actually done for transients. Commented Feb 23, 2023 at 13:32

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