- Documentation Library
- Table of Contents
- MySQL 5.5 Manual
- MySQL 5.4 Manual
- MySQL 5.1 Manual
- MySQL 5.0 Manual
- MySQL 3.23/4.0/4.1 Manual
- Table of Contents
- 4.6 MySQL Administrative and Utility Programs
- 4.6.1 myisam_ftdump — Display Full-Text Index information
- 4.6.2 myisamchk — MyISAM Table-Maintenance Utility
- 4.6.3 myisamlog — Display MyISAM Log File Contents
- 4.6.4 myisampack — Generate Compressed, Read-Only MyISAM Tables
- 4.6.5 mysqlaccess — Client for Checking Access Privileges
- 4.6.6 mysqlbinlog — Utility for Processing Binary Log Files
- 4.6.7 mysqldumpslow — Summarize Slow Query Log Files
- 4.6.8 mysqlhotcopy — A Database Backup Program
- 4.6.9 mysqlmanagerc — Internal Test-Suite Program
- 4.6.10 mysqlmanager-pwgen — Internal Test-Suite Program
- 4.6.11 mysql_convert_table_format — Convert Tables to Use a Given Storage Engine
- 4.6.12 mysql_explain_log — Use EXPLAIN on Statements in Query Log
- 4.6.13 mysql_find_rows — Extract SQL Statements from Files
- 4.6.14 mysql_fix_extensions — Normalize Table File Name Extensions
- 4.6.15 mysql_setpermission — Interactively Set Permissions in Grant Tables
- 4.6.16 mysql_tableinfo — Generate Database Metadata
- 4.6.17 mysql_waitpid — Kill Process and Wait for Its Termination
- 4.6.18 mysql_zap — Kill Processes That Match a Pattern
mysql_explain_log reads its standard input
for query log contents. It uses
EXPLAIN to analyze
SELECT statements found in the
input. UPDATE statements are
rewritten to SELECT statements
and also analyzed with EXPLAIN.
mysql_explain_log then displays a summary of
its results.
The results may assist you in determining which queries result in table scans and where it would be beneficial to add indexes to your tables.
Invoke mysql_explain_log like this, where
log_file contains all or part of a
MySQL query log:
shell> mysql_explain_log [options] < log_file
mysql_explain_log supports the following options:
-
--help,-?Display a help message and exit.
-
--date=,YYMMDD-dYYMMDDSelect entries from the log only for the given date.
-
--host=,host_name-hhost_nameConnect to the MySQL server on the given host.
-
--password=,password-ppasswordThe password to use when connecting to the server.
Specifying a password on the command line should be considered insecure. See Section 5.4.2.2, “End-User Guidelines for Password Security”.
-
--printerror=1,-e 1Enable error output.
-
--socket=,path-SpathFor connections to
localhost, the Unix socket file to use, or, on Windows, the name of the named pipe to use. -
--user=,user_name-uuser_nameThe MySQL user name to use when connecting to the server.
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