Fatal error: Allowed memory size of 12582912 bytes exhausted (tried to allocate 23456789 bytes) in somefile.php
Fatal Error: PHP Allowed Memory Size Exhausted
These errors occur when PHP tries to process a large database record, or when importing or exporting a database.
To fix the problem, please modify the memory_limit line in php.ini to match this example:
We do set the maximum memory limit at 64 MB (67108864 bytes). If you want to go higher, you will need a VPS plan or dedicated server.
So, if you see "Allowed memory size of 67108864 bytes exhausted..." in the error, then you cannot increase the limit any higher without a VPS plan or Dedicated Server
Important Update: Memory limit has now been increased to 128M across all shared servers.