Memory Overflow Issue When Working with wp_insert_post()

Let's consider a case where suspending object caching resolves the memory overflow issue, which is very common when importing data into WP.

Suppose we are importing a large array of data into WordPress. For instance, we need to populate the post table from another database, CSV file, or via an API. For this purpose, we have a code where we use the post insertion function wp_insert_post() or wp_update_post(). These functions, after adding the post to the database, add the data to the cache to retrieve it later without additional queries. However, caching is not needed during import because by default, the cache is stored in the memory and it may run out as a result of import.

Therefore, to ensure the import works as intended, we need to disable the cache before the import and then re-enable it afterward:

// Remember the current state (this is an example of how it can be done)
$was_suspended = wp_suspend_cache_addition();

// Disable caching
wp_suspend_cache_addition( true );

// YOUR IMPORT CODE HERE. Object caching does not work here anymore.

// Restore the previous cache state
wp_suspend_cache_addition( $was_suspended );

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This Note embeded into: wp_suspend_cache_addition()