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Why do we need WP _ query in WordPress?
As WordPress developers, we often need to retrieve posts, pages and other content matching specific criteria from the WordPress database. Usually, we don’t need to build SQL queries (and often we shouldn’t) because the WP_Query class and its methods provide us with a safe and efficient way to retrieve data from the database.
When to consider the efficiency of a WordPress query?
When traffic and content are limited, we usually don’t care about the efficiency of our queries. WordPress builds well-optimized SQL queries and provides a caching system out of the box. When traffic and site content grow significantly – up to thousands of posts – then we must consider query execution time.
How to optimize SQL queries in WordPress?
I will focus on parameters provided by the WP_Query class specifically to optimize SQL queries, reducing execution time and resource consumption. When traffic and content are limited, we usually don’t care about the efficiency of our queries. WordPress builds well-optimized SQL queries and provides a caching system out of the box.
How to merge two queries together in WordPress?
What you need is actually a third query to get all the posts at once. Then you change your first two queries to not return the posts, but only the post IDs in a format that you can work with. The ‘fields’=>’ids’ parameter will make a query actually return an array of matching post ID numbers.
How can I fix slow SQL queries in WordPress?
The first step in fixing slow SQL queries is to find them. Ashley has sung the praises of the debugging plugin Query Monitor on the blog before, and it’s the databases queries feature of the plugin that really makes it an invaluable tool for identifying slow SQL queries and improving database performance.
How to improve the performance of SQL queries?
Ashley has sung the praises of the debugging plugin Query Monitor on the blog before, and it’s the databases queries feature of the plugin that really makes it an invaluable tool for identifying slow SQL queries and improving database performance. The plugin reports on all the database queries executed during the page request.
How to filter the result of a WP query?
We can do a lot of more, and filter the returning result set granularly, just by passing an array of parameters to a new instance of the WP_Query class, as we’ll do in the following example:
What are the most common problems with WordPress?
Here is a list of the 10 WordPress problems we will tackle. This common WordPress problem most often occurs when adding code snippets to your site via functions.php. Upon reload, instead of your site you see something like the screen above. No good!
Why is my WordPress not connecting to my database?
When you see the above message, the problem is clear: WordPress can not connect to the site’s database. In case you didn’t know, the database is where WordPress saves all your content, like posts and pages and other vital information.