The mysql client can do these types of logging for statements executed interactively:
On Unix, mysql writes the statements to a history file. By default, this file is named
.mysql_historyin your home directory. To specify a different file, set the value of the
On all platforms, if the
--syslogoption is given, mysql writes the statements to the system logging facility. On Unix, this is
syslog; on Windows, it is the Windows Event Log. The destination where logged messages appear is system dependent. On Linux, the destination is often the
The following discussion describes characteristics that apply to all logging types and provides information specific to each logging type.
How Logging Occurs
For each enabled logging destination, statement logging occurs as follows:
Statements are logged only when executed interactively. Statements are noninteractive, for example, when read from a file or a pipe. It is also possible to suppress statement logging by using the
Statements are ignored and not logged if they match any pattern in the “ignore” list. This list is described later.
mysql logs each nonignored, nonempty statement line individually.
If a nonignored statement spans multiple lines (not including the terminating delimiter), mysql concatenates the lines to form the complete statement, maps newlines to spaces, and logs the result, plus a delimiter.
Consequently, an input statement that spans multiple lines can be logged twice. Consider this input:
mysql> SELECT -> 'Today is' -> , -> CURDATE() -> ;
In this case, mysql logs the
“SELECT”, “'Today is'”,
“,”, “CURDATE()”, and “;”
lines as it reads them. It also logs the complete statement,
SELECT 'Today is' ,
CURDATE(), plus a delimiter. Thus, these lines appear
in logged output:
SELECT 'Today is' , CURDATE() ; SELECT 'Today is' , CURDATE();
mysql ignores for logging purposes statements
that match any pattern in the “ignore” list. By
default, the pattern list is
"*IDENTIFIED*:*PASSWORD*", to ignore
statements that refer to passwords. Pattern matching is not
case-sensitive. Within patterns, two characters are special:
?matches any single character.
*matches any sequence of zero or more characters.
To specify additional patterns, use the
--histignore option or set the
MYSQL_HISTIGNORE environment variable. (If
both are specified, the option value takes precedence.) The
value should be a list of one or more colon-separated patterns,
which are appended to the default pattern list.
Patterns specified on the command line might need to be quoted
or escaped to prevent your command interpreter from treating
them specially. For example, to suppress logging for
statements in addition to statements that refer to passwords,
invoke mysql like this:
Controlling the History File
.mysql_history file should be protected
with a restrictive access mode because sensitive information
might be written to it, such as the text of SQL statements that
contain passwords. See Section 18.104.22.168, “End-User Guidelines for Password Security”.
Statements in the file are accessible from the
mysql client when the
up-arrow key is used to recall the history. See
Disabling Interactive History.
If you do not want to maintain a history file, first remove
.mysql_history if it exists. Then use
either of the following techniques to prevent it from being
MYSQL_HISTFILEenvironment variable to
/dev/null. To cause this setting to take effect each time you log in, put it in one of your shell's startup files.
.mysql_historyas a symbolic link to
/dev/null; this need be done only once:
ln -s /dev/null $HOME/.mysql_history
syslog Logging Characteristics
--syslog option is given,
mysql writes interactive statements to the
system logging facility. Message logging has the following
Logging occurs at the “information” level. This
corresponds to the
LOG_INFO priority for
syslog on Unix/Linux
syslog capability and to
EVENTLOG_INFORMATION_TYPE for the Windows
Event Log. Consult your system documentation for configuration
of your logging capability.
Message size is limited to 1024 bytes.
Messages consist of the identifier
MysqlClient followed by these values:
The operating system user name (login name) or
--if the user is unknown.
The MySQL user name (specified with the
--if the user is unknown.
The client connection identifier. This is the same as the
CONNECTION_ID()function value within the session.
The server host or
--if the host is unknown.
The default database or
--if no database has been selected.
The text of the logged statement.
Here is a sample of output generated on Linux by using
--syslog. This output is formatted for
readability; each logged message actually takes a single line.
Mar 7 12:39:25 myhost MysqlClient: SYSTEM_USER:'oscar', MYSQL_USER:'my_oscar', CONNECTION_ID:23, DB_SERVER:'127.0.0.1', DB:'--', QUERY:'USE test;' Mar 7 12:39:28 myhost MysqlClient: SYSTEM_USER:'oscar', MYSQL_USER:'my_oscar', CONNECTION_ID:23, DB_SERVER:'127.0.0.1', DB:'test', QUERY:'SHOW TABLES;'