[+/-]
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) or with --safe-mode
which
disables a lot of optimization that may cause problems. See
Abschnitt A.4.2, „Was zu tun ist, wenn MySQL andauernd abstürzt“.
If mysqld doesn't want to start, you should
verify that you don't have any my.cnf
files
that interfere with your setup! You can check your
my.cnf
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 can't 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 haven't 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 myisamchk. See
Kapitel 5, Datenbankverwaltung. You should also check
the slow queries with EXPLAIN
.
You should also read the OS-specific section in this manual for problems that may be unique to your environment. See Abschnitt 2.12, „Betriebssystemspezifische Anmerkungen“.
Dies ist eine Übersetzung des MySQL-Referenzhandbuchs, das sich auf dev.mysql.com befindet. Das ursprüngliche Referenzhandbuch ist auf Englisch, und diese Übersetzung ist nicht notwendigerweise so aktuell wie die englische Ausgabe. Das vorliegende deutschsprachige Handbuch behandelt MySQL bis zur Version 5.1.