Manual:Profiling table

The profiling table is used to store profiling-related data. This table doesn't exist unless created, e.g. by setting  in your StartProfiler.php and running.

pf_count
Event count (an integer).

pf_time
Time sum (milliseconds).

pf_memory
Memory sum (kb).

pf_name
Method name (e.g. Title::getNamespace).

pf_server
Host (e.g. lucy-HP-Compaq-Elite-8300-SF).

Schema
DESCRIBE profiling; +---+--+--+-+-+---+ +---+--+--+-+-+---+ +---+--+--+-+-+---+
 * Field    | Type         | Null | Key | Default | Extra |
 * pf_count | int(11)      | NO   |     | 0       |       |
 * pf_time  | float        | NO   |     | 0       |       |
 * pf_memory | float       | NO   |     | 0       |       |
 * pf_name  | varchar(255) | NO   | PRI |         |       |
 * pf_server | varchar(30) | NO   | PRI |         |       |