Gary Pendergast 210e23a63d 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.


Built from https://develop.svn.wordpress.org/trunk@38229


git-svn-id: http://core.svn.wordpress.org/trunk@38170 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2016-08-09 11:39:36 +00:00

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about.php

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admin.php

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credits.php

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edit.php

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freedoms.php

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index.php

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menu.php

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2016-05-05 17:13:26 +00:00

plugin-editor.php

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plugin-install.php

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plugins.php

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profile.php

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settings.php

Network Admin: Replace "Options saved." notice with "Settings saved.".

2016-07-04 22:01:27 +00:00

setup.php

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site-info.php

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site-new.php

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site-settings.php

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site-themes.php

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site-users.php

Text Changes: Unify permission error messages.

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sites.php

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theme-editor.php

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theme-install.php

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themes.php

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update-core.php

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update.php

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upgrade.php

Multisite: Improve performance of the upgrade page on large networks.

2016-08-09 11:39:36 +00:00

user-edit.php

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2013-09-25 00:18:11 +00:00

user-new.php

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users.php

Text Changes: Unify permission error messages.

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