[root@localhost ~]# mysqladmin -u root shutdown
mysqladmin: connect to server at ‘localhost’ failed
error: ‘Can’t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock’ (2)’
Check that mysqld is running and that the socket: ‘/var/lib/mysql/mysql.sock’ exists!

Using following command I checked the mysql directory.
[root@localhost ~]# ll /var/lib/mysql/

I did not found the mysql.sock file there.

[root@localhost ~]# cd /var/lib/mysql/
Created file in that location.
[root@localhost mysql]# touch mysql.sock
Gave the executabe permission the sock file.
[root@localhost mysql]# chmod +x mysql.sock
Changed the permission to mysql user
[root@localhost mysql]# chown mysql:mysql -R *

After that restarted the machine
[root@localhost mysql]# /etc/init.d/mysqld start
Starting mysqld:                                           [  OK  ]
[root@localhost mysql]# mysql -uroot
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.1.52 MySQL Community Server (GPL) by Remi

Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL v2 license

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.

mysql> show databases;

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For creating new user use the following commands.

CREATE USER 'wordpressapi'@'localhost' IDENTIFIED BY 'Test@123456';
GRANT ALL ON *.* TO 'wordpressapi'@'localhost';

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Using following command I checked the mysql directory.
[root@localhost ~]# ll /var/lib/mysql/

I did not found the mysql.sock file there.

[root@localhost ~]# cd /var/lib/mysql/
Created file in that location.
[root@localhost mysql]# touch mysql.sock
Gave the executabe permission the sock file.
[root@localhost mysql]# chmod +x mysql.sock
Changed the permission to mysql user
[root@localhost mysql]# chown mysql:mysql -R *

After that restarted the machine
[root@localhost mysql]# /etc/init.d/mysqld start
Starting mysqld:                                           [  OK  ]
[root@localhost mysql]# mysql -uroot
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.1.52 MySQL Community Server (GPL) by Remi

Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
This software comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to modify and redistribute it under the GPL v2 license

Type ‘help;’ or ‘\h’ for help. Type ‘\c’ to clear the current input statement.

mysql> show databases;

Incoming search terms:

• cant connect to local mysql server through socket /var/lib/mysql/mysql sock (2)
• check that mysqld is running and that the socket: \/var/lib/mysql/mysql sock\ exists!
• centos Cannot connect to MySQL server on localhost
• Could not connect to database: Cant connect to local MySQL server through socket /var/run/mysqld/mysqld sock (2)

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If you want to optimize the all tables of database then use following script.

<?php
$dbconnect = mysql_connect('localhost', 'mysql_user', 'mysql_password');
if (!$dbconnect) {
 die('Could not connect: ' . mysql_error());
}
echo 'Connected to database successfully';

mysql_select_db('YOUR_DATABASE',$dbconnect);

dbConnect();
$alltables = mysql_query("SHOW TABLES");

while ($table = mysql_fetch_assoc($alltables))
{
 foreach ($table as $db => $tablename)
 {
 mysql_query("OPTIMIZE TABLE '".$tablename."'")
 or die(mysql_error());
 }
}
echo 'All tables optimized successfully';

mysql_close($dbconnect);
?>

The MySQL Optimize Table command will effectively de-fragment a mysql table and is very useful for tables which are frequently updated and/or deleted.

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I found some major reasons for mysql sleep processes. Here I am giving some reasons:

1. apache requests increase
2. mysql queries increase
3. mysql slow queries increase
4. apache connections start to wait on slow mysql queries
5. apache connections take longer to close
6. more apache connections are opened
7. with each apache request a new sleeping mysql connection is made
8. mysql & apache reach max_connections
9. server slows to a crawl

Using linux top command you can check the load average and which process is taking so much memory of your server. If you saw mysqld is taking much memory of server then you should check using following mysql commands:

> show full processlist;

using this command you can check the mysql processes. Which sql queries being fired on mysql server. If you found so much sleep processes then you should check your mysql variables and settings. If so much mysql queries being fired on specific table then you should change the table storage engine type.

Using following command you can change the storage engine type.
> ALTER TABLE tablename ENGINE = MYISAM;

MYISAM storage engine type is faster then inodb. you can create the mediator tables also for big size table to handing a load of table.

Then major change for solving the issue of sleep processes is, you should change the wait_timeout variable. Default value is 2800 seconds.

mysql> show variables;

you can change the setting using following  mysql command. Best value is 60 second need to be set for wait timeout.
mysql> show variables like ‘wait_timeout’;

mysql> set global wait_timeout=60;

mysql>show variables like ‘wait_timeout’;

After doing above changes you can check the mysql processlist. If you are still facing issues with mysql then please write to me.

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In this tutorial I will show you how to created mysql log file for checking the SELECT, UPDATE, DELETE or any types of mysql queries.

If you are using the linux then use the my.cnf file which will be located in etc folder. If you are using the windows then use the my.ini file. That file you will find in following location in case of wamp server.

c:\wamp\bin\mysql\mysql5.0.45\my.ini

I am using the Linux so here I am giving that example.  use following command.

[root@siwank-pc mysql]# mkdir /var/log/mysql
[root@siwank-pc mysql]# chown mysql:mysql /var/log/mysql

[root@siwank-pc mysql]# vim /etc/my.cnf

[mysqld]
log = /var/log/mysql/mysqld.log //This log file will give you the full mysql access log

log-error=/var/log/mysql/mysqld-error.log // this log file will give you the error log of mysql

log-slow-queries=/var/log/mysql/log-slow-queries.log // this log file will give you the slow queries log

If you need the more information about mysql logs then write to me.

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If you want to use the mongodb with php then you need to install pecl libraries. Mongo extension is not bundled with PHP.
For installing the Mongo use following URL:
If you dont have pecl installed on your linux machine then use following command.
# yum install php-pecl*
then use following command
# pecl install mongo
Then open the php.ini file. if you are using the linux then use following command.
# vim /etc/php.ini

## Add following lines, end of php.ini file ##
# MongoDB Driver
extension=mongo.so

Restart the apache webserver using following command
# /etc/init.d/httpd restart
If Mongodb server is running then use can test your mongodb database using following code:
Create the mongotest.php file

<?php
// connect
$m = new Mongo();
// select a database
$db = $m->wordpress;
$collection = $db->wordpressapi;
// add an element
$obj = array( "title" => "Sony this Good.\n", "author" => "Wordpressapi.com" );
$collection->insert($obj);
// add another element, with a different "shape"
$obj = array( "title" => "Wordpressapi.com", "online" => true );
$collection->insert($obj);
// find everything in the collection
$cursor = $collection->find();
// iterate through the results
foreach ($cursor as $obj) {
echo $obj["title"] . "\n";
echo $obj["author"] . "\n";
}
// disconnect
$m->close();
?>

If you open this file in browser then you can see the following words in browser:
Sony this Good. WordPressapi.com Sony this Good. WordPressapi.com
If you want to use the mongodb with php then you need to install pecl libraries. Mongo extension is not bundled with PHP.
For installing the Mongo use following URL:
If you dont have pecl installed on your linux machine then use following command.# yum install php-pecl*
then use following command# pecl install mongo
Then open the php.ini file. if you are using the linux then use following command.
# vim /etc/php.ini

## Add following lines, end of php.ini file ### MongoDB Driverextension=mongo.so

Restart the apache webserver using following command
# /etc/init.d/httpd restart
If Mongodb server is running then use can test your mongodb database using following code:
Create the mongotest.php file

<?php
// connect$m = new Mongo();
// select a database$db = $m->wordpress;$collection = $db->wordpressapi;
// add an element$obj = array( "title" => "Sony this Good.\n", "author" => "Wordpressapi.com" );$collection->insert($obj);
// add another element, with a different "shape"$obj = array( "title" => "Wordpressapi.com", "online" => true );$collection->insert($obj);
// find everything in the collection$cursor = $collection->find();
// iterate through the resultsforeach ($cursor as $obj) {    echo $obj["title"] . "\n";     echo $obj["author"] . "\n";}
// disconnect$m->close();
?>

If you open this file in browser then you can see the following words in browser:Sony this Good. WordPressapi.com Sony this Good. WordPressapi.com

Incoming search terms:

• wordpress mongodb

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Before installing the Mongodb on linux box you need to install following packages on box.

[root@sonyk-pc Download]# sudo yum -y install git tcsh scons gcc-c++ glibc-devel
[root@sonyk-pc Download]# sudo yum -y install boost-devel pcre-devel js-devel readline-devel
[root@sonyk-pc Download]# sudo yum -y install boost-devel-static readline-static ncurses-static

For 32bit user use following command

[root@sonyk-pc Download]# wget http://fastdl.mongodb.org/linux/mongodb-linux-i686-1.6.2.tgz

For 64bit use following command

[root@sonyk-pc Download]# wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-1.6.2.tgz
[root@sonyk-pc Download]# tar xzf mongodb-linux-i686-1.6.2.tgz
[root@sonyk-pc Download]#  cd mongodb-linux-i686-1.6.2

Mongo stores database in data/db folder. so we need to create those folder using following command.

[root@sonyk-pc mongodb-linux-i686-1.6.2]# sudo mkdir -p /data/db/
[root@sonyk-pc mongodb-linux-i686-1.6.2]# sudo chown `id -u` /data/db

[root@sonyk-pc mongodb-linux-i686-1.6.2]# ./bin/mongod
./bin/mongod --help for help and startup options
Thu Sep  9 13:10:55 MongoDB starting : pid=22159 port=27017 dbpath=/data/db/ 32-bit
** NOTE: when using MongoDB 32 bit, you are limited to about 2 gigabytes of data
**       see http://blog.mongodb.org/post/137788967/32-bit-limitations
Thu Sep  9 13:10:55 db version v1.6.2, pdfile version 4.5

If you want to create mongodb service in linux then use following steps:

[root@sonyk-pc Download]# wget http://fastdl.mongodb.org/linux/mongodb-linux-i686-1.6.2.tgz
[root@sonyk-pc Download]# tar xzf http://fastdl.mongodb.org/linux/mongodb-linux-i686-1.6.2.tgz
[root@sonyk-pc Download]# mv mongodb-linux-i686-1.6.2 /opt/mongodb
[root@sonyk-pc Download]# mkdir -p /srv/db/mongodb
[root@sonyk-pc Download]# touch /srv/db/mongodb.log
[root@sonyk-pc Download]# mkdir /opt/bin/
[root@sonyk-pc Download]# mkdir /opt/config/

create the File: /opt/bin/mongodb-stop
Put following code in that file:

#!/bin/bash
pid=`ps -o pid,command ax | grep mongod | awk '!/awk/ && !/grep/ {print $1}'`;
if [ "${pid}" != "" ]; then
kill -2 ${pid};
fi

create the File: /opt/bin/mongodb-start
Put following code in that file:

#!/bin/sh
/opt/mongodb/bin/mongod --config /opt/config/mongodb \
## --upgrade \ ##runs a database upgrade option if needed \

File: /opt/config/mongodb
Put following code in that file:

# Configuration Options for MongoDB
#
# For More Information, Consider:
# - Configuration Parameters: http://www.mongodb.org/display/DOCS/Command+Line+Parameters
# - File Based Configuration: http://www.mongodb.org/display/DOCS/File+Based+Configuration
dbpath = /srv/db/mongodb
logpath = /srv/db/mongodb.log
logappend = true
bind_ip = 127.0.0.1
port = 27017
fork = true
auth = true
# noauth = true

Do that file as linux executable
chmod +x /opt/bin/mongodb-start
chmod +x /opt/bin/mongodb-stop
We’ve also created a very basic “init script” as a wrapper around the mongodb-start and mongo-stop scripts described above. You will still need to modify and manage the configuration of your MongoDB server in the files above. This script only provides a means for ensuring that MongoDB will start at boot. Issue the following commands:
wget http://library.linode.com/databases/mongodb/reference/init-rpm.sh
mv init-rpm.sh /etc/rc.d/init.d/mongodb
chmod +x /etc/rc.d/init.d/mongodb /etc/init.d/mongodb
chkconfig –add mongodb
chkconfig –level 35 mongodb on
You will also need to create a user and group for mongodb; issue the following command:

useradd -M -r --home-dir /opt/mongodb mongodb

Now issue the following command to ensure that the MongoDB user you just created will have access to all required files in the /srv/db/ hierarchy:
chown mongodb:mongodb -R /srv/db/
To start and stop MongoDB using the init script, issue the appropriate command from the following:
/etc/init.d/mongodb start
/etc/init.d/mongodb stop
For checking the web admin interface of Mongodb – listening on port 28017
Check this URL : http://localhost:28017/
Before installing the Mongodb on linux box you need to install following packages on box.[root@sonyk-pc Download]# sudo yum -y install git tcsh scons gcc-c++ glibc-devel[root@sonyk-pc Download]# sudo yum -y install boost-devel pcre-devel js-devel readline-devel[root@sonyk-pc Download]# sudo yum -y install boost-devel-static readline-static ncurses-static

For 32bit user use following command[root@sonyk-pc Download]# wget http://fastdl.mongodb.org/linux/mongodb-linux-i686-1.6.2.tgz
For 64bit use following command[root@sonyk-pc Download]# wget http://fastdl.mongodb.org/linux/mongodb-linux-x86_64-1.6.2.tgz

[root@sonyk-pc Download]# tar xzf mongodb-linux-i686-1.6.2.tgz [root@sonyk-pc Download]# cd mongodb-linux-i686-1.6.2
Mongo stores database in data/db folder. so we need to create those folder using following command.
[root@sonyk-pc mongodb-linux-i686-1.6.2]# sudo mkdir -p /data/db/[root@sonyk-pc mongodb-linux-i686-1.6.2]# sudo chown `id -u` /data/db
Using following command you can start the mongo database.
[root@sonyk-pc mongodb-linux-i686-1.6.2]# ./bin/mongod./bin/mongod –help for help and startup optionsThu Sep 9 13:10:55 MongoDB starting : pid=22159 port=27017 dbpath=/data/db/ 32-bit
** NOTE: when using MongoDB 32 bit, you are limited to about 2 gigabytes of data** see http://blog.mongodb.org/post/137788967/32-bit-limitations
Thu Sep 9 13:10:55 db version v1.6.2, pdfile version 4.5

If you want to create mongodb service in linux then use following steps:
[root@sonyk-pc Download]# wget http://fastdl.mongodb.org/linux/mongodb-linux-i686-1.6.2.tgz [root@sonyk-pc Download]# tar xzf http://fastdl.mongodb.org/linux/mongodb-linux-i686-1.6.2.tgz[root@sonyk-pc Download]# mv mongodb-linux-i686-1.6.2 /opt/mongodb[root@sonyk-pc Download]# mkdir -p /srv/db/mongodb[root@sonyk-pc Download]# touch /srv/db/mongodb.log
[root@sonyk-pc Download]# mkdir /opt/bin/[root@sonyk-pc Download]# mkdir /opt/config/
create the File: /opt/bin/mongodb-stopPut following code in that file;

#!/bin/bash
pid=`ps -o pid,command ax | grep mongod | awk '!/awk/ && !/grep/ {print $1}'`;if [ "${pid}" != "" ]; then    kill -2 ${pid};fi

create the File: /opt/bin/mongodb-startPut following code in that file:

#!/bin/sh
/opt/mongodb/bin/mongod --config /opt/config/mongodb \## --upgrade \ ##runs a database upgrade option if needed \

File: /opt/config/mongodbPut following code in that file:

# Configuration Options for MongoDB## For More Information, Consider:# - Configuration Parameters: http://www.mongodb.org/display/DOCS/Command+Line+Parameters# - File Based Configuration: http://www.mongodb.org/display/DOCS/File+Based+Configuration
dbpath = /srv/db/mongodblogpath = /srv/db/mongodb.loglogappend = true
bind_ip = 127.0.0.1port = 27017fork = true
auth = true# noauth = true

Do that file as linux executatblechmod +x /opt/bin/mongodb-startchmod +x /opt/bin/mongodb-stop

We’ve also created a very basic “init script” as a wrapper around the mongodb-start and mongo-stop scripts described above. You will still need to modify and manage the configuration of your MongoDB server in the files above. This script only provides a means for ensuring that MongoDB will start at boot. Issue the following commands:
wget http://library.linode.com/databases/mongodb/reference/init-rpm.shmv init-rpm.sh /etc/rc.d/init.d/mongodbchmod +x /etc/rc.d/init.d/mongodb /etc/init.d/mongodbchkconfig –add mongodbchkconfig –level 35 mongodb on

You will also need to create a user and group for mongodb; issue the following command:

useradd -M -r --home-dir /opt/mongodb mongodb

Now issue the following command to ensure that the MongoDB user you just created will have access to all required files in the /srv/db/ hierarchy:
chown mongodb:mongodb -R /srv/db/
To start and stop MongoDB using the init script, issue the appropriate command from the following:
/etc/init.d/mongodb start/etc/init.d/mongodb stop

For checking the web admin interface of Mongodb – listening on port 28017Check this URL : http://localhost:28017/

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[root@sonyk-pc sony]# yum –enablerepo=remi install mysql-workbench
Loaded plugins: refresh-packagekit
remi | 3.0 kB 00:00
remi/primary_db | 198 kB 00:01
Setting up Install Process
Resolving Dependencies
–> Running transaction check
—> Package mysql-workbench.i586 0:5.2.26-1.fc11.remi set to be updated
–> Processing Dependency: mysql-connector-c++ >= 1.1.0-0.1.bzr888 for package: mysql-workbench-5.2.26-1.fc11.remi.i586
–> Processing Dependency: python-paramiko for package: mysql-workbench-5.2.26-1.fc11.remi.i586
–> Running transaction check
—> Package mysql-connector-c++.i586 0:1.1.0-0.1.bzr888.fc11.remi set to be updated
—> Package python-paramiko.noarch 0:1.7.5-1.fc11 set to be updated
–> Finished Dependency Resolution

Dependencies Resolved

==================================================================================================================================================================================================================================
Package Arch Version Repository Size
==================================================================================================================================================================================================================================
Installing:
mysql-workbench i586 5.2.26-1.fc11.remi remi 14 M
Installing for dependencies:
mysql-connector-c++ i586 1.1.0-0.1.bzr888.fc11.remi remi 252 k
python-paramiko noarch 1.7.5-1.fc11 updates 982 k

Transaction Summary
==================================================================================================================================================================================================================================
Install 3 Package(s)
Upgrade 0 Package(s)

Total download size: 15 M
Is this ok [y/N]: y
Downloading Packages:
(1/3): mysql-connector-c++-1.1.0-0.1.bzr888.fc11.remi.i586.rpm | 252 kB 00:03
(2/3): mysql-workbench-5.2.26-1.fc11.remi.i586.rpm | 14 MB 02:17
http://fedoramirror.hnsdc.com/updates/11/i386/python-paramiko-1.7.5-1.fc11.noarch.rpm: [Errno 14] HTTP Error 404: Not Found
Trying other mirror.
(3/3): python-paramiko-1.7.5-1.fc11.noarch.rpm | 982 kB 00:09
———————————————————————————————————————————————————————————————————————————-
Total 98 kB/s | 15 MB 02:34
warning: rpmts_HdrFromFdno: Header V3 DSA signature: NOKEY, key ID 00f97f56
remi/gpgkey | 1.3 kB 00:00
Importing GPG key 0x00F97F56 “Remi Collet ” from /etc/pki/rpm-gpg/RPM-GPG-KEY-remi
Is this ok [y/N]: y
Running rpm_check_debug
Running Transaction Test
Finished Transaction Test
Transaction Test Succeeded
Running Transaction
Installing : python-paramiko-1.7.5-1.fc11.noarch 1/3
Installing : mysql-connector-c++-1.1.0-0.1.bzr888.fc11.remi.i586 2/3
Installing : mysql-workbench-5.2.26-1.fc11.remi.i586 3/3

Installed:
mysql-workbench.i586 0:5.2.26-1.fc11.remi

Dependency Installed:
mysql-connector-c++.i586 0:1.1.0-0.1.bzr888.fc11.remi python-paramiko.noarch 0:1.7.5-1.fc11

Complete!
[root@sonyk-pc sony]#

After installation you will find the mysql workbench under application-> programming  menu

After that you will you will see the following screen.

clicking on new connection you can create the new connections and after that If you want to create the ER diagram then go to database Option and reverse engineering.

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Using following article You can find the largest tables from Mysql database.

Finding largest tables on MySQL instance is no brainier in MySQL 5.0+ thanks to Information Schema but I still wanted to post little query I use for the purpose so I can easily find it later, plus it is quite handy in a way it presents information:

I do some converting and rounding to see number of rows in millions and data and index size in GB so I can save on counting zeros.
The last column shows how much does the index take compared to the data which is mainly for informational purposes but for MyISAM can also help you to size your key buffer compared to operating system cache.

I also use it to see which tables may be worth to review in terms of indexes. Large index size compared to data size often indicates there is a lot of indexes (so it is well possible there are some duplicates, redundant or simply unused indexes among them) or may be there is long primary key with Innodb tables. Of course it also could be perfectly fine tables but it is worth to look.

Changing the query a bit to look for different sorting order or extra data – such as average row length you can learn quite a lot about your schema this way.

It is also worth to note queries on information_schema can be rather slow if you have a lot of large tables. On this instance it took 2.5 minutes to run for 450 tables.

UPDATE: To make things easier I’ve added INFORMATION_SCHEMA to the query so it works whatever database you have active. It does not work with MySQL before 5.0 still of course

Incoming search terms:

• how to create pdf file from mysql query in wordpress blog

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