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Flush Tables


What exactly does the command FLUSH TABLES do? I'm not sure if its a SQL command, but it does exist as a mysqladmin command.


View 1 Replies (Posted: Feb 4, 2009, 21:37)

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Related Forum Messages for MySQL:
Flush Tables - Current Or Every Database?
Does the MySQL command: FLUSH TABLES; flush every table in the current database, or every table on the server? I'm using MySQL 5.0 - the documentation is unclear, although it does mention that: FLUSH TABLES WITH READ LOCK; will do so for ALL databases.

Posted: Dec 3 08 at 12:21

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Detection Of 'flush Tables With Read Lock' In Php?
I would like to know from my application if a myisam table can accept writes (i.e. not locked). If an exception is thrown, everything is fine as I can catch this and log the failed statement to a file. However, if a 'flush tables with read lock' command has been issued (possibly for backup), the query I send will pretty much hang out forever. If one table is locked at a time, insert delayed works well. But when this global lock is applied, my query just waits. The query I run is an insert statement. If this statement fails or hangs, user experience is degraded. I need a way to send the query to the server and forget about it (pretty much). Does anyone have any suggestions on how to deal with this? -set a query timeout?-run asyncronous request and allow for the lock to expire while application continues?-fork my php process?

Posted: Mar 30 10 at 10:52

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Backup Error: Cannot Flush Tables With Read Lock
I have scheduled mysql backup using the following in crontab on linux:

/usr/bin/mabackup -d /ozg/mysql_backup -x mysql -c myconnection profile_bkup

But this fails with following error:

"Backup error: Cannot flush tables with read lock "

Posted: July 13, 2009 12:58AM

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Mysql -uroot -p -e 'FLUSH TABLES WITH READ LOCK;' Not Working
$ mysql -uroot -p -e 'FLUSH TABLES WITH READ LOCK;'

is not working for me.

- I tried another command like 'show tables;' and that worked.
- when im inside mysql it works just as it should.
- I know the tables aren't being locked because I've run similar UPDATE scripts for both; issuing in mysql and outside.

version is: 5.0.45-6

Posted: August 15, 2008 11:54PM

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PHP Flush
is it posiable to flush MySQL in php?

Posted: May 7th, 2005, 07:25 PM

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Flush Logs
MySql version 5.0.27 on Windows 2003

I tried:
I log in to my cmd with: mysql -h localhost -u user -p

mysql> cd mysql-data-directory
mysql> mv mysql.log mysql.old
mysql> mv mysql-slow.log mysql-slow.old
mysql> mysqladmin flush-logs

and
C:> mysql -h localhost -u user -p -e "cd mysql-data-directory;mv mysql.log mysql.old;mv mysql-slow.log mysql-slow.old;mysqladmin flush-logs;"
Enter password: ******
Error 1064 (42000) at line 1: You have an error in your SQL syntax...

My server.log (in the example mysql.log) is 2 GB now and the server-slow.log (mysql-slow.log) about 650mb.

Posted: August 13, 2008 02:20AM

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Flush Privelege
The problem began with that I had trouble to log in to the server, because my local IP address changed. My user id at the new client IP address was not allowed to connect to the server.I then logged in to the unix box, run the mysql through unix command line as root.Then I tried to grant the access to the my user id at my new local IP address.
I was told that user root@localhost doesn't have the access right.
I checked the grant privilege of the root@localhost, it had all the rights.
Don't know where is the error. Until I run the flush priviledge command, sign of the mysql, and sign in back to mysql (all these activities are run through unix command line at the localhost.), then i run the grant command, now everything was fine. access was granted to my user id at the new IP address and then I could access to the mysql server from my desktop pc again.

Posted: September 12, 2005 06:31PM

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Flush Hosts
Here's the session for my flush-hosts attempt:

login as: root
Password:
root@delphi:~# mysqladmin -uroot -p flush-hosts
Enter password:
root@delphi:~# mysqladmin -uroot -p refresh
Enter password:
root@delphi:~#

I am getting this error:

Error

MySQL said:
#1129 - Host '' is blocked because of many connection errors. Unblock with 'mysqladmin flush-hosts'

Posted: 10-06-2004, 11:45 AM

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Flush Privileges
When this code gets to the FLUSH PRIVILEGES, it dies (displays Error, insert query failed flush)?

Code:
...
<?php
if(isset($_POST['submit']))
{
include '../library/config.php';
include '../library/opendb.php';

$title = $_POST['title'];
$body = $_POST['body'];

$query = "INSERT INTO articles (title, body, authorid) VALUES ('$title', '$body', '1')";
mysql_query($query) or die('Error, insert query failed');

$query = "FLUSH PRIVILEGES";
mysql_query($query) or die('Error, insert query failed flush');

include '../library/closedb.php';
echo "<p>New article added.</p><a href='index.php'>Go to all articles.</a>";
}
else
{
?>
<form method="post">
...

Posted: Jan 12, 2008, 20:56

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Commit/Flush Or Somethink Like This
I'm using MySQL with ODBC and got a question about how MySQL stores it's data to the harddisk.

What I do is the following. I call the ODBC interface with LOAD DATA INFILE to add some data. Now, what is if MySQL or the whole pc crashes at this running process and direcly after it? Do I have to call somethink like flush or commit after this command to ensure that the information has written to the disk? Or does MySQL automatic flush the database?

Posted: November 11, 2008 07:38AM

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MySQL Database Table - PhpMyAdmin - FLUSH
We are having problems with our banner ads - clicks deliver you to our homepage rather than the assigned URL. Our banners run on php/mysql based software and I believe the problem is a build up of logs and that cronjobs set to deal with them are not functioning as they should.

Knowing very little about such things and awaiting tech support to look into it and resolve the issue I poked around the database and noticed the "Table Maintenance" area and a "FLUSH" link. MySQL says this clears the cache. I'm tempted to flush the tables I think are having problems to see if that resolves it temporarily but don't want to mess anything up. Any thoughts on all this? Will "FLUSH" do anything I might regret?

Posted: Oct 16, 2006, 10:11

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Number Too High For Query Cache - Can't I Flush It Using PHP?
I assume it is a permissions issue because when I run mysql_query("FLUSH QUERY CACHE") from my PHP program it fails. How can I give PHP permission to run this command? Also, at what number should I flush the cache. Is 40 too high, it is OK to let it go higher? [URL]

Posted: March 13, 2011 09:45AM

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Moving Database Files Location Flush Table?
Im going to move database files location (including changing datadir in my.cnf).

but I still not clear about FLUSH TABLES;

mysql website says: "clears or reloads various internal caches used by MySQL"

some people says: "forcing all open tables (those in the table cache) to be closed"

what is open and close tables? do I need to flush table when move database files location ?

Posted: Dec 22 10 at 17:42

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Host 'X' Is Blocked Because Of Many Connection Errors; Unblock With 'mysqladmin Flush-hosts' [1129]
During a resyncing process my forum displays the following error message:

SQL ERROR [ mysqli ]

Host 'X' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts' [1129]

I want to change this message to something else but dont know where the text is stored.

Posted: July 31, 2010 08:26PM

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Database Creation Error "flush Privileges Failed"
I ran into an error since today with the creation of SQL database here is the error

. MySQL database failed! : SQL flush privileges failed : Table 'mysql.servers' doesn't exist at ../web-lib-funcs.pl line 1323.

How to fix that prorblem? I search trough the net a solution and founded this one from andrey:

"One possible fix would be to locate the "mysql_fix_privilege_tables" that's provided with your version of MySQL, and to run that -- it may be able to solve that for you."

But I don't know how to it by the command line in the shell?

Posted: November 24, 2009 05:46AM

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$connection->exec('FLUSH PRIVILEGES;');

and

$connection->query('FLUSH PRIVILEGES;');

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[CODE....]

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Tables
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CREATE TABLE `numbers` (
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Posted: July 23, 2006 11:26PM

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