- 22.214.171.124 Compiling MySQL for Debugging
- 126.96.36.199 Creating Trace Files
- 188.8.131.52 Using WER with PDB to create a Windows crashdump
- 184.108.40.206 Debugging mysqld under gdb
- 220.127.116.11 Using a Stack Trace
- 18.104.22.168 Using Server Logs to Find Causes of Errors in mysqld
- 22.214.171.124 Making a Test Case If You Experience Table Corruption
If you are using some functionality that is very new in MySQL,
you can try to run mysqld with the
--skip-new (which disables all new, potentially
unsafe functionality). See Section B.5.3.3, “What to Do If MySQL Keeps Crashing”.
If mysqld does not want to start, verify that
you have no
my.cnf files that interfere
with your setup! You can check your
arguments with mysqld --print-defaults and
avoid using them by starting with mysqld --no-defaults
If mysqld starts to eat up CPU or memory or if it “hangs,” you can use mysqladmin processlist status to find out if someone is executing a query that takes a long time. It may be a good idea to run mysqladmin -i10 processlist status in some window if you are experiencing performance problems or problems when new clients cannot connect.
The command mysqladmin debug dumps some information about locks in use, used memory and query usage to the MySQL log file. This may help solve some problems. This command also provides some useful information even if you have not compiled MySQL for debugging!
If the problem is that some tables are getting slower and slower
you should try to optimize the table with
OPTIMIZE TABLE or
Chapter 5, MySQL Server Administration. You should also check
the slow queries with
You should also read the OS-specific section in this manual for problems that may be unique to your environment. See Section 2.1, “General Installation Guidance”.