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When you use the Message Broker profile in WSO2 EI, a separate database is required for storing data specific to the broker. This is in addition to the default /wiki/spaces/ADMIN5xx/pages/22151545Carbon database. By default, the EI Message Broker is shipped with an embedded H2 database (WSO2MB_DB.ht.db) for this purpose. These databases are stored in the <EI_HOME>/wso2/broker/repository/database directory.

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A datasource is used to establish the connection to a database. By default,  the WSO2_MB_CARBONSTORE_DB datasource is configured in the master-datasources.xml file for the purpose of connecting to the default  H2 database , which stores registry and user management that stores MB-specific data. 

After setting up the MySQL database to replace the default H2 database, either change the default configurations of the WSO2_MB_CARBONSTORE_DB datasource, or configure a new datasource to point it to the new database as explained below.

Follow the steps below to change the type of the default WSO2_CARBON_DB datasource.

1. Open the <EI_HOME>/wso2/broker/conf/datasources/m aster-datasources.xml file and locate the <datasource> configuration element.

2. You You simply have to update the the url pointing  pointing to your MySQL database, the the username and  and password required  required to access the database and the MySQL driver details  driver details as shown below. Further, be sure to set the <defaultAutoCommit> element to false for the MB database. 

   Localtabgroup

   Localtab title MySQL Code Block language html/xml <datasource> <name>WSO2_MB_STORE_DB</name> <description>The datasource used for message broker database</description> <description></description> <jndiConfig> <name>WSO2MBStoreDB<<name>jdbc/WSO2MBStoreDB</name> </jndiConfig> <definition type="RDBMS"> <configuration> <url>jdbc:h2mysql:repository//databaselocalhost:3306/WSO2MB_DB;DB_CLOSE_ON_EXIT=FALSE;LOCK_TIMEOUT=60000<wso2_mb</url> <username>wso2carbon<<username>regadmin</username> <password>wso2carbon<<password>regadmin</password> <driverClassName>org.h2<driverClassName>com.mysql.jdbc.Driver</driverClassName> <maxActive>80</maxActive> <maxActive>50</maxActive> <maxWait>60000</maxWait> <maxWait>60000</maxWait> <minIdle>5</minIdle> <testOnBorrow>true</testOnBorrow> <validationQuery>SELECT 1</validationQuery> <validationInterval>30000</validationInterval> <defaultAutoCommit>false</defaultAutoCommit> </configuration> </definition> </datasource> Localtab title MS SQL Code Block language xml <datasource> <name>WSO2_MB_STORE_DB</name> <description></description> <jndiConfig> <name>WSO2MBStoreDB</name> </jndiConfig> <definition type="RDBMS"> <configuration> <url>jdbc:jtds:sqlserver://localhost:1433/wso2_mb</url> <username>sa</username> <password>sa</password> <driverClassName>com.microsoft.sqlserver.jdbc.SQLServerDriver</driverClassName> <maxActive>200</maxActive> <maxWait>60000</maxWait> <minIdle>5</minIdle> <testOnBorrow>true</testOnBorrow> <validationQuery>SELECT 1</validationQuery> <validationInterval>30000</validationInterval> <defaultAutoCommit>false</defaultAutoCommit> </configuration> </definition> </datasource> Localtab title Oracle Code Block language xml <datasource> <name>WSO2_MB_STORE_DB</name> <description></description> <jndiConfig> <name>WSO2MBStoreDB</name> </jndiConfig> <definition type="RDBMS"> <configuration> <driverClassName>oracle.jdbc.driver.OracleDriver</driverClassName> <url>jdbc:oracle:thin:@localhost:1521/orcl</url> <maxActive>100</maxActive> <maxWait>60000</maxWait> <minIdle>5</minIdle> <testOnBorrow>true</testOnBorrow> <validationQuery>SELECT 1 FROM DUAL</validationQuery> <validationInterval>30000</validationInterval> <username>scott</username> <password>tiger</password> <defaultAutoCommit>false</defaultAutoCommit> </configuration> </definition> </datasource>

3. Optionally, you can update the configuration elements given below for your database connection.

   The name and password of the database user

   Element	Description
   url	The URL of the database. The default port for MySQL is 3306
   username and password
   driverClassName	The class name of the database driver
   maxActive	The maximum number of active connections that can be allocated at the same time from this pool. Enter any negative value to denote an unlimited number of active connections.
   maxWait	The maximum number of milliseconds that the pool will wait (when there are no available connections) for a connection to be returned before throwing an exception. You can enter zero or a negative value to wait indefinitely.
   minIdle	The minimum number of active connections that can remain idle in the pool without extra ones being created, or enter zero to create none.
   testOnBorrow	The indication of whether objects will be validated before being borrowed from the pool. If the object fails to validate, it will be dropped from the pool, and another attempt will be made to borrow another.
   validationQuery	The SQL query that will be used to validate connections from this pool before returning them to the caller.
   validationInterval	The indication to avoid excess validation, and only run validation at the most, at this frequency (time in milliseconds). If a connection is due for validation but has been validated previously within this interval, it will not be validated again.
   Anchor default_auto_commit default_auto_commit defaultAutoCommit	It is required to disable auto committing by setting this property to false for the MB database. This means that multiple SQL statements will be committed to the database as one transaction, as opposed to committing each SQL statement as an individual transaction.

   Info
   For more information on other parameters that can be defined in the <EI_HOME>/wso2/broker/conf/datasources/ master-datasources.xml file, see Tomcat JDBC Connection Pool.

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