Linux Servers cPanel webhosting blog » Mysql + phpmyadmin

phpMyAdmin showing the foreach() error

Gunjan — Sat, 04 Feb 2012 17:18:43 +0000

After upgrading the cPanel version, the following error is occur when we are browsing the phpMyAdmin.

Warning: Invalid argument supplied for foreach() in /usr/local/cpanel/base/3rdparty/phpMyAdmin/tbl_replace.php on line 52

Warning: Invalid argument supplied for foreach() in /usr/local/cpanel/base/3rdparty/phpMyAdmin/tbl_replace.php on line 155

Warning: Cannot modify header information – headers already sent by (output started at /usr/local/cpanel/base/3rdparty/phpMyAdmin/tbl_replace.php:52) in /usr/local/cpanel/base/3rdparty/phpMyAdmin/libraries/common.lib.php on line 1154

To resolve the above error, we can simply enable the output_buffering in the following file.

/usr/local/cpanel/3rdparty/lib/php.ini

Change the “output_buffering” from Off to On.

Recreate the jos_session for Joomla script

Gunjan — Tue, 03 Jan 2012 20:32:43 +0000

Some time we face the jos_session session corrupt error message at that time, we can recreate the “jos_session” table by running the following query from the phpmyadmin.

DROP table if exist `jos_session`

CREATE TABLE `jos_session` (
`username` varchar(150) default ”,
`time` varchar(14) default ”,
`session_id` varchar(200) NOT NULL default ’0′,
`guest` tinyint(4) default ’1′,
`userid` int(11) default ’0′,
`usertype` varchar(50) default ”,
`gid` tinyint(3) unsigned NOT NULL default ’0′,
`client_id` tinyint(3) unsigned NOT NULL default ’0′,
`data` longtext,
PRIMARY KEY (`session_id`(64)),
KEY `whosonline` (`guest`,`usertype`),
KEY `userid` (`userid`),
KEY `time` (`time`)
) TYPE=MyISAM CHARACTER SET `utf8`;

But make sure that you have taken the backup for the existing database.

NOTE : If you have any issue to copy the above query, please refer to the following URL to copy the jos_session table query.

http://www.theperfectarts.com/jos_session.txt

Monitor Mysql process

Gunjan — Thu, 10 Nov 2011 14:05:05 +0000

In the daily Linux monitoring,we are facing the high mysql cpu usage problem but not sure which database or mysql query is using excessive CPU, at that time we can use the following commands to monitor the mysql process and optimize the offending database.

server@root[~]#mysqladmin proc stat

The above command will show you the current status for mysql process and if you want to check the continuously running mysql process then run the following command.

server@root[~]#mysqladmin -i3 pr

You can also install watchmysql to monitor the mysql

Change database encoding value for postgresql dataabse.

Gunjan — Sat, 05 Mar 2011 15:11:21 +0000

We can change database encoding values for postgresql database by using following steps but make sure that you have taken backup for current database.

su postgres -

To check all database run

psql -l

To switch database for example we are using support_test

psql -d support_test

Run command to check encoding

SET CLIENT_ENCODING TO ‘LATIN1′;
or
SET NAMES ‘LATIN1′;

Now check encoding

support_test=# SHOW client_encoding;
client_encoding
—————–
LATIN1
(1 row)

“unauthenticated user” problem in mysql logs?

Gunjan — Wed, 30 Jun 2010 19:54:11 +0000

While running following command.

mysqladmin -i3 pr

We are getting result.

056 | unauthenticated user | localhost | | Connect | | Reading from net |

To avoid such problem add following lines in /etc/my.cnf file to avoid access for unauthenticated user.

root@server [~]# pico /etc/my.cnf

skip-networking
skip-name-resolve
skip-host-cache
skip-locking

Now restart the mysql service and check mysql process logs again.

Database sizes shows zero in cPanel?

Gunjan — Sun, 04 Apr 2010 08:37:32 +0000

Once we upgrade from cPanel 11.24 to 11.25 version. We are receiving lots bug. One of them is database size showing zero in cPanel. To resolve this issue you have to edit following file /var/cpanel/cpanel.config

root@support[~]vi /var/cpanel/cpanel.config

Search line “disk_usage_include_sqldbs” in file “ /var/cpanel/cpanel.config “ and change it

From

disk_usage_include_sqldbs=0

disk_usage_include_sqldbs=1

And run script

-/scripts/update_db_cache

How to check mysql servers set values?

Gunjan — Sun, 21 Feb 2010 01:59:34 +0000

Most of the time we need to check the mysql value set on server and most of the techs checks /etc/my.cnf file.If you want to check all values set in mysql on server. We can use following simple command.

mysqld –no-defaults –verbose –help

phpmyadmin error “Cannot start session without errors”?

Gunjan — Wed, 02 Dec 2009 14:22:06 +0000

The most common problem in newly installed cPanel server is as follows after browsing the phpmyadmin problem.

“cannot start session without errors, please check errors given in your PHP and/or webserver log file and configure your PHP installation properly.”

To resolve above error you need to change the values in /usr/local/cpanel/3rdparty/etc/phpmyadmin/php.ini file.

root@admin[~]#pico /usr/local/cpanel/3rdparty/etc/phpmyadmin/php.ini
And than change the following values in php.ini file

FROM:
—–
session.save_handler = sqlite
session.save_path =/var/cpanel/userhomes/cpanelphpmyadmin/sessions/phpsess.sdb
—–

TO
—–
session.save_handler = files
session.save_path = /tmp
Note : To make change the values in php.ini you need to login into as root user.

How to repair mysql database table manually?

Gunjan — Mon, 16 Nov 2009 20:21:04 +0000

You can repair the database table manually from shell by using following command.

root@admin[~]mysql>mysql –u databaseusername –p databasename

For example if we are using database gunjan_db

root@admin[~]mysql

mysql> use gunjan_db;
Database changed

mysql> show tables;

| counter

For example we need to repair table orders_status

mysql> q
Bye

Backup of mysql database using cron job.

Gunjan — Tue, 06 Oct 2009 08:30:58 +0000

To generate the backup of mysql database using cron job refer following three format as per your requirement.

1) Cron job to generate database backup in .sql format

* * * * * /usr/bin/mysqldump -u databaseusername databasename -ppassword > /path of database database.sql

2) Cronjob to compress database backup in .bz2 format

* * * * * /usr/bin/mysqldump -u datbaseusername databasename -pdatbasepassword|bzip2 -c > /path of database database.bz2

3) Cronjob to compress database backup in .gz format

* * * * * /usr/bin/mysqldump -u databaseusername databasename -ppassword|gzip > /path of databasedatabase.gz

If you have any problem or idea about this thread than contact me at linux7802@gmail.com