SQLite Object Cache vs Country Caching Extension

DUE TO PERSONAL CIRCUMSTANCES I AM NO LONGER ABLE TO DEVELOP OR SUPPORT THIS PLUGIN. IF YOU ARE INTERESTED IN ADOPTING THIS PLUGIN SEE https://developer.wordpress.org/plugins/wordpress-org/take-over-an-existing-plugin/ Solves wrong country content for visitor Geo-Location issues. Enables Comet Cache to display the correct page and widget content for a visitor’s country. Bonus also makes Cookie Notice work correctly with Comet Cache (whether using country/EU geolocation or not). If you need country caching with other caching plugins then see “Advice” below. This plugin adds an extension to Comet Cache enabling it to create separate snapshots (cache) for each page based on country location. Extra caching can be restricted to specific countries and/or a group of countries. E.g. if you are based in the US but show different content to Canadian,Mexican & EU country visitors, you can set separate caching for CA & MX visitors + single group cache for EU visitors; the remainder of your visitors will standard cache (“US”) content. It works on normal WordPress and on Multisite (see FAQ). Comet Cache is designed to work with add-on scripts and should work seamlessly with this plugin. Identification of visitor country for caching Via Cloudflare or Maxmind. (this product includes GeoLite2 data created by MaxMind, available from http://www.maxmind.com ) It is also possible to connect a different GeoLocation sytem of your choice (see documentation). If you use Cloudflare and have “switched on” their GeoLocation option ( see Cloudflare’s instructions ) then it will be used to identify visitor country. If not, then the Maxmind Country Database will be used. Updating (If not using Cloudflare for country) The installed Maxmind Country/IP data file will lose accuracy over time. To automate a monthly update of this file, install and enable the Category Country Aware (CCA) plugin (Country Caching and the Cataegory Country Aware (CCA) plugins use the same Maxmind data file in the same folder and the CCA plugin includes code for its update). The CCA plugin has many other features and functionality you may find useful. Alternatively you can manually update (FAQ below). Additional Info and support ADVICE: Don’t use ANY Caching plugin UNLESS you know how to use an FTP program (e.g. Filezilla). Support forums show that Caching plugins including Comet Cache can result in “white screen” problems for some users; the only solution may be to delete files using FTP/Cpanel or OS command line. The Country Caching plugin deletes files on deactivation/delete, but in “white screen” situations you may have to resort to “manual” deletion – see FAQ for instructions. WP Super Cache: is also designed to work with “add-ons” and an equivalent of this plugin is available in the WordPress repository. W3 Total Cache does not currently provide a suitable hook for plugin country caching. Others have requested this facility. License This program is free software licensed under the terms of the GNU General Public License version 2 as published by the Free Software Foundation. In particular please note the following: This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

A persistent object cache helps your site perform well. This one uses the widely available SQLite3 extension, and optionally the igbinary and APCu extensions to php. Many hosting services offer those extensions, and they are easy to install on a server you control. What is this about? It’s about making your site’s web server perform better. An object cache does that by reducing the workload on your MariaDB or MySQL database. This is not a page cache; these persistent objects go into a different kind of cache. These objects aren’t chunks of web pages ready for people to view in their browsers, they are data objects for use by the WordPress software. Caches are ubiquitous in computing, and WordPress has its own caching subsystem. Caches contain short-term copies of the results of expensive database lookups or computations, and allow software to use the copy rather than repeating the expensive operation. This plugin (like other object-caching plugins) extends WordPress’s caching subsystem to save those short-term copies from page view to page view. WordPress’s cache happens to be a memoization cache. Without a persistent object cache, every WordPress page view must use your MariaDB or MySQL database server to retrieve everything about your site. When a user requests a page, WordPress starts from scratch and loads everything it needs from your database server. Only then can it deliver content to your user. With a persistent object cache, WordPress immediately loads much of the information it needs. This lightens the load on your database server and delivers content to your users faster. Who should use this? If your site runs on a single web server machine, and that server provides the SQLite3 and igbinary extensions to php, this plugin will almost certainly make your site work faster. And if that server provides the APCu extension, this plugin uses it too. Some hosting providers offer redis cache servers. If your provider offers redis, it may be a good choice. You can use it via the Redis Object Cache plugin. Sites using redis have one SQL database and another non-SQL storage server: redis. Other hosting providers offer memcached, which has the Memcached Object Cache plugin. And some large multipurpose cache plugins, such as the LiteSpeed Cache, also offer object caching based on one of those cache server software packages. The cache-server approach to object caching comes into its own when you have multiple load-balanced web server machines handling your site. SQLite doesn’t work correctly in a multiple-web-server environment. But, for single-server site configurations, SQLite, possibly assisted by APCu, performs well. And the vast majority of sites are single-server. APCu APCu is an in-memory storage medium. It lets php programs, like WordPress, store data in shared memory so it’s very fast to retrieve when needed. If APCu is available on your host server, you can configure this plugin to use it. It reduces the typical cache lookup time to one-fifth or less of the SQLite lookup time, which is itself a few tens of microseconds. Performance counts, especially on busy web sites. Please look at Installation to learn how to configure this plugin to use APCu. The plugin works fast without it, and faster with it. WP-CLI: Even if APCu is in use, caching with SQLite is necessary when your web site uses WP-CLI, because WP-CLI programs do not have access to the APCu cache. This plugin writes all cached data both to APCu and to SQLite and makes sure the two are synchronized. WP-CLI You can control this plugin via WP-CLI once you activate it. Please type this command into your shell for details. wp help sqlite-object-cache Credits Thanks to Till Krüss. His Redis Object Cache plugin serves as a model for this one. And thanks to Ari Stathopoulos and Jonny Harris for reviewing this. Props to Matt Jones for finding and fixing a bug that appeared on a heavily loaded system. Thanks to Massimo Villa for testing help, and to nickchomey for a comprehensive code review. All defects are, of course, entirely the author’s responsibility. And thanks to Jetbrains for the use of their software development tools, especially PhpStorm. It’s hard to imagine how a plugin like this one could be developed without PhpStorm’s tools for exploring epic code bases like WordPress’s. How can I learn more about making my WordPress site more efficient? We offer several plugins to help with your site’s database efficiency. You can read about them here.