Column count of mysql.proc is wrong. Expected 20, found 16. The table is probably corrupted

Question

I am using 000webhost.com and I am using phpMyAdmin there. I am getting this error from MySQL when I run my PHP script as the title says:

Column count of

Answer 1

I was using a windows 10 system and the solution that worked for me was mysql_upgrade -u root -p

But you need to ensure that the path to the mysql_upgrade script which is present in the mysql/bin folder of your installation directory needs to be added in the environment variable path for this command to work

Answer 2

Although you may be correct about the necessity for upgrade, that's not the only reason this error occurs.

When the following is called with a query that returns 1 row

 my $rv = $sth_indexq->fetchall_arrayref;

the following error is reported:

DBD::mysql::st execute failed: Column count of mysql.proc is wrong. Expected 20, found 16. Created with MySQL 50520, now running 50528. Please use mysql_upgrade to fix this error. at 
...

However, the real cause of the error was use of fetchall_arrayref instead of fetchrow_arrayref. The following worked without errors:

my $rv = $sth_indexq->fetchrow_arrayref;

The data in $rv was only 1 level deep, not 2.

The mysql_upgrade solution may very well solve this issue, but the simple solution is know your data and use the right retrieval code.

J.White