500 – An error has occurred!

DB function failed with error number 126
Incorrect key file for table ‘/tmp/#sql_54d6_0.MYI’; try to repair it SQL=SELECT c.*, g.name AS groupname, cc.title AS name, u.name AS editor, f.content_id AS frontpage, s.title AS section_name, v.name AS author FROM jos_content AS c LEFT JOIN jos_categories AS cc ON cc.id = c.catid LEFT JOIN jos_sections AS s ON s.id = c.sectionid LEFT JOIN jos_groups AS g ON g.id = c.access LEFT JOIN jos_users AS u ON u.id = c.checked_out LEFT JOIN jos_users AS v ON v.id = c.created_by LEFT JOIN jos_content_frontpage AS f ON f.content_id = c.id WHERE c.state != -2 ORDER BY section_name , section_name, cc.title, c.ordering LIMIT 0, 20

Have you ever got this? Joomla users may have seen it. Is Joomla CMS is not stable enough? Nope! This error is not caused by Joomla.

This error is come from MySQL. If you read the error message above, you may see there are several tables are involved:

• jos_content
• jos_categories
• jos_sections
• jos_groups
• jos_users
• jos_content_frontpage

The possibility is one of the tables above has been damaged by something. Failure on electricity or something else.

The solution is you need to repair one of those tables by using command REPARO, ups sorry, that’s spell for repairing stuff in Harry Potter story :D. This is the command: REPAIR TABLE. This is how to use it:

repair table jos_content;
repair table jos_categories;
repair table jos_sections;
repair table jos_groups;
repair table jos_users;
repair table jos_content_frontpage;

If the problem still exist although you have repaired all those tables, another possibility is your MySQL temporary directory. You can’t write that directory (maybe full).

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Sun - Oracle

A few days ago, Oracle, a company which is known by it’s RDBMS, Oracle Database, bought Sun Microsystems ($7.4 billion.. wheewwww), a company which is known by it’s famous programming language, Java. As we know, Sun had bought MySQL, the famous open source database. Hmm… can you imagine how big Oracle now?

I just wonder what will happen tomorrow. Oracle has the enterprice market, meanwhile MySQL has SOHO market. Now Oracle has them all. I think Microsoft will be jealous. Microsoft SQL Server will not rule the Database World. Absolutely.

There are so many opinions about the future after Oracle bought Sun. May be Oracle will stop MySQL development, or still developing but not provide it as open source anymore. Or it will be better, MySQL will have Oracle features. What about Java? Do we have to pay to use Java like Microsoft does? Some people think it will be disaster. But I hope that Oracle won’t let open source community down.

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jtablesession::Store Failed
DB function failed with error number 145
Table ‘./joomla_database/jos_session’ is marked as crashed and should be repaired SQL=INSERT INTO `jos_session` (`session_id`,`time`,`username`,`gid`,`guest`,`client_id`) VALUES (’1ecb458814b53d190db10cafee822dc0′,’1237429551′,”’0′,’1′,’0′);

Error message above usually happens to CMS Joomla. One of Joomla tables jos_session (the table name depends on prefix) is crash. Don’t worry if you experience this problem. It’s easy to overcome this problem. Just truncate the table jos_session. SQL command:

mysql> truncate jos_session;

It’s done!

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Using Command Line
If we decide to use command line, then we must know the syntax to create it. It’s pretty simple: CREATE DATABASE database_name. Of course we should have a MySQL account which has privilege to create a database.

Example:

mysql> CREATE DATABASE dagunetdb;

Don’t forget the semicolon, then press Enter. It’s Done.

Using PHPMyAdmin
PHPMyAdmin is a web-based application which is used to manage databases. PHPMyAdmin is written in PHP Language. It can be downloaded here. Don’t worry, it’s free of charge. To create a database, you need to login to PHPMyAdmin (You need MySQL account which has privilege to create a database). In the front page, there is a text box to fill the database name. If you have typed it, click Create button. It’s done.

Create database using PHPMyAdmin

Using MySQL Query Browser
PHPMyAdmin is a web-based application, but MySQL Query Browser is desktop-based application. This software is developed by mysql.com. And it’s free also. Download MySQL Query Browser here. To create a database is as simple as pressing Ctrl + N. Type database name in pop-up window. Click OK. It’s done.

Creating Database Using MySQL Query Browser

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[ Download MySQL Connector ]

Extract downloaded file (file type: *.jar). Copy that file to directory [jre installation]/lib/ext/. Ok, your Java application is ready to connect with MySQL.

Testing
Code below is used to connect between Java and MySQL.
/*
* DBConnection.java
*
* Created on 29 September 2007, 11:41
*
*/

import java.sql.*;

/**
*
* @author Dani Gunawan
*/
public class DBConnection {

/** Creates a new instance of DBConnection */
public DBConnection() {
}

public Connection connect() {
Connection conn = null;

try
{
String userName = “root”;
String password = “”;
String url = “jdbc:mysql://blog.danigunawan.com/test”;
Class.forName (“com.mysql.jdbc.Driver”).newInstance ();
conn = DriverManager.getConnection (url, userName, password);
} catch (Exception e) {
e.printStackTrace();
conn = null;
} finally {
if (conn != null)
{
try
{
conn.close ();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
}

return conn;
}
}

Code below is used to test the database connection.

/**
* TesConnection.java
*/
import java.sql.*;

public class TesConnection {

public static void main(String args[]) {

Connection dbcon = new DBConnection().connect();

if (dbcon != null) {
System.out.println(“Database connection is successfully created”);
} else {
System.out.println(“Database connection isn’t successfully created”);
}
}

}

How to Use Them?
Put those two source in the same directory. Compile DBConnection.java and TesConnection.java respectively.

javac DBConnection.java
javac TesConnection.java

If you want to compile all of them, use wildcard asterisk (*).

javac *.java

Run TesConnection:

java TesConnection

If the result:

Database connection is successfully created

Then your database is has been connected. But if:

Database connection isn’t successfully created

means your Java application isn’t connected yet with the database.
Possibility:
- MySQL isn’t installed yet
- Database hasn’t been created yet (or maybe wrong database name)
- Wrong database user or password

Both source can be downloaded from link below:

[ Download example file ]

P.S.:
Code had been tested in Windows XP SP 2 Operating System, never been done in other operating systems.

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2. Creating Database in MySQL
3. After Oracle Bought Sun