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Gary Pendergast cfafcf3997 Multisite: Improve performance of the upgrade page on large networks.
The query to select the next 5 blogs to upgrade was ordered by `registered`, which isn't indexed. This causes the query to table scan, which will be slow on networks with many blogs.

The query only needs to be ordered by something that won't change, so ordering by `blog_id` is a good replacement. `blog_id` is indexed, and it's the only column being returned, so MySQL is able to optimize for a fast index read.

Props fliespl.
Fixes #37612.



git-svn-id: https://develop.svn.wordpress.org/trunk@38229 602fd350-edb4-49c9-b593-d223f7449a82
2016-08-09 11:38:41 +00:00
src Multisite: Improve performance of the upgrade page on large networks. 2016-08-09 11:38:41 +00:00
tests Boostrap/Load: Improve forward compatiblity of plugin global backup methods. 2016-08-09 01:44:20 +00:00
tools/i18n DOCS: Replace HTTP links with HTTPS. 2016-06-10 04:49:09 +00:00
.editorconfig Use HTTPS URLs for codex.wordpress.org. 2015-04-12 21:28:58 +00:00
.gitignore Remove accidental .svn addition to .gitignore 2015-12-12 18:26:22 +00:00
.jshintrc Build: Prevent non-breaking spaces from accidentally being inserted into JavaScript files. 2015-11-12 12:04:55 +00:00
.travis.yml Output node and npm versions on travis 2016-06-16 17:27:22 +00:00
Gruntfile.js Grunt: when running precommit use regex to check which files have been modified. 2016-06-19 12:31:15 +00:00
package.json Trunk is now 4.7-alpha. 2016-08-02 13:44:37 +00:00
phpunit.xml.dist Set a whitelist for PHPUnit code coverage. 2016-05-17 20:22:57 +00:00
wp-cli.yml Remove debug mode from WP-CLI by default, as it now outputs too much debugging information to be of use during normal development. 2015-11-28 18:36:06 +00:00
wp-config-sample.php Lightly clean up and improve inline documentation in wp-config-sample.php. 2015-05-10 00:05:30 +00:00
wp-tests-config-sample.php Unit Tests: Correct comment in wp-tests-config-sample.php. 2016-01-21 20:24:12 +00:00