New answers tagged hosting
You should try to avoid using so many pages, especially if you have hierarchy between them, as the code for the pages admin page is not efficient. 45000 pages will just not work. The alternatives are Use a CPT Write your own page admin Use one of the management consoles (I think that one is part of jetpack) that let you manage the site via XML-RPC
If you are on any environment you did not personally set up, you may not have the permissions to override the php.ini file. Also some plugins can manually do: ini_set( 'memory_limit', '512M');
I had this same problem, first put this in the bottom of your wp-config file to force url location: define('WP_HOME','yourSiteUrlHere'); define('WP_SITEURL','yourSiteUrlHere'); The ONLY thing that worked for me to log in is using the "emergency.php" script. It forces WP to let you in. Go here for more info on making the script: ...
This is a hosting question, as mentioned above. However, if you are going to host your DNS for the addon domain on Siteground, then you need to specify the nameservers for Siteground on your registrar. If your DNS will be hosted somewhere other than Siteground, then you will specify the IP address of the installation on Siteground.
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