add_clean_index( string $table, string $index ): true

Adds an index to a specified table.


$table string Required
Database table name.
$index string Required
Database table index column.

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true True, when done with execution.

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File: wp-admin/includes/upgrade.php. View all references

function add_clean_index( $table, $index ) {
	global $wpdb;

	drop_index( $table, $index );
	$wpdb->query( "ALTER TABLE `$table` ADD INDEX ( `$index` )" );

	return true;

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Version Description
1.0.1 Introduced.

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User Contributed Notes

  1. Skip to note 1 content
    Contributed by MakeWebBetter

    Sometimes after a table has been created in a database, we find that it is advantageous to add an index to that table to speed up queries involving this table.

    function wpdocs_mwb_make_fetch_fast()
        global $wpdb;
        // Add some Clean up indices
        add_clean_index( $wpdb->posts, 'post_name' );
        add_clean_index( $wpdb->categories, 'category_nicename' );
        add_clean_index( $wpdb->comments, 'comment_approved' );
        add_clean_index( $wpdb->posts, 'post_status' );

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