April 2008
Intermediate to advanced
566 pages
21h 55m
English
Content preview from MySQL in a Nutshell, 2nd Edition
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Name
FLUSH
Synopsis
FLUSH [LOCAL|NO_WRITE_TO_BINLOG] option[, ...]Options:
DES_KEY_FILE, HOSTS, LOGS, MASTER, PRIVILEGES, QUERY_CACHE, STATUS, TABLE, TABLES, TABLES WITHOUT READ LOCK, USER_RESOURCES
Use this statement to clear and reload temporary caches in MySQL. It
requires RELOAD privileges. To prevent this
statement from writing to the binary log file, the NO_WRITE_TO_BINLOG flag or its
LOCAL alias may be given. A particular cache to
flush may be given as an option. Multiple options (see Table 4-1) may be given in a comma-separated list.
As of version 5.1 of MySQL, FLUSH cannot be
used in stored functions and triggers, but can be used in stored procedures. As an alternative to the FLUSH statement, you can use
the mysqladmin command (see Chapter 16).
Table 4-1. Options for FLUSH statement
Option | Explanation |
|---|---|
| Reloads the DES encryption file, which is given
with the |
| Clears the hosts cache, which is used to minimize host/IP address lookups. The hosts cache may need to be flushed if a host has been blocked from accessing the server. |
| Used to close all of the log files and reopen
them. If the server has binary logging enabled, it will change
the binary log file to the next in numeric sequence. If the
error log was enabled, it will rename the error log to the
same name, but with the ending |
| This option is not logged and has been
deprecated. Use the |
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