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 understands the following options:
--help
,
-?
Display a help message and exit.
--date=
,
YYMMDD
-d
YYMMDD
Select entries from the log only for the given date.
--host=
,
host_name
-h
host_name
Connect to the MySQL server on the given host.
--password=
,
password
-p
password
The password to use when connecting to the server.
Specifying a password on the command line should be considered insecure. See Section 5.3.2.2, “End-User Guidelines for Password Security”.
--printerror=1
,
-e 1
Enable error output.
--socket=
,
path
-S
path
For connections to localhost
, the Unix
socket file to use, or, on Windows, the name of the named
pipe to use.
--user=
,
user_name
-u
user_name
The MySQL user name to use when connecting to the server.
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