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My MySql server currently has 235 databases. Should I worry?
They all have same structure with MyISAM tables.
The hardware is a virtual machine with 2 GB RAM running on a Quad-Core AMD Opteron 2.2GHz.
Recently cPanel sent me an email saying that MySql has failed and a restart has been made.
New databases are being expected to be created and I wonder if I should add more memory or if I should simply add another virtual machine.
The “databases” in mysql are really catalogues, is has no effect on its limits whether you put all the tables in one or each in its own.
The main problem is the table cache. Without tuning it, you’re going to have the default table cache (=64 typically), which means you will be closing a table every time you open one. This is incredibly bad.
Except in MyISAM, it’s even worse, because closing a table throws its key blocks out of the key cache, which means subsequent index lookups or scans will be reading actual blocks from disc, which is horrible and slow and really needs to be avoided.
My advice is: