In my server I noticed that I have mysqld and mysqld_safe processes running simultaneously. Is mysqld_safe supposed to run always, together with mysqld?
It is best that does. If you read the the code for mysqld_safe, there is basic startup initialization in the beginning and an indefinite loop at the bottom. Here is the pseudocode description of the Loop
Start the Loop
run mysqld inside the loop
once mysqld terminates, check for how terrmination occurred
if normally terminated, exit loop (such as service mysql stop)
if abnormally terminated on startup, exit loop (errmsg posted in error file)
if abnormally terminated otherwise, errmsg posted why mysqld died
retry mysqld
End of Loop
This is an oversimplified description of what mysqld_safe does
It is best that does. If you read the the code for mysqld_safe, there is basic startup initialization in the beginning and an indefinite loop at the bottom. Here is the pseudocode description of the Loop
Start the Loop
service mysql stop)End of Loop
This is an oversimplified description of what mysqld_safe does