The following sections describe how to replace the default H2 databases with IBM DB2:
Download the latest version of DB2 Express-C and install it on your computer.
Setting up the database and users
Using the DB2 command processor
- Run DB2 console and execute the
db2startcommand in CLI to open DB2.
- Create the database using the following command:
create database <DB_NAME>
- Before issuing a SQL statement, establish the connection to the database using the following command:
connect to <DB_NAME> user <USER_ID> using <PASSWORD>
Grant required permissions for users as follows:
For more information on DB2 commands, see the DB2 Express-C Guide.
Using the DB2 control center
- Open the DB2 control center using the
db2cccommand as follows:
- Right-click All Databases in the control center tree (inside the object browser), click Create Database, and then click Standard and follow the steps in the Create New Database wizard.
- Click User and Group Objects in the control center tree to create users for the newly created database.
- Give the required permissions to the newly created users.
Setting up DB2 JDBC drivers
Copy the DB2 JDBC drivers (
<DB2_HOME>/SQLLIB/java/ directory to the
<DB2_HOME> refers to the installation directory of DB2 Express-C, and <
_HOME> refers to the directory where you run the WSO2 product instance.
Setting up datasource configurations
A datasource is used to establish the connection to a database. By default,
WSO2_CARBON_DB datasource is used to connect to the default H2 database, which stores registry and user management data. After setting up the IBM DB2 database to replace the default H2 database, either change the default configurations of the
WSO2_CARBON_DB datasource, or configure a new datasource to point it to the new database as explained below.
Edit the default datasource configuration in the <
aster-datasources.xmlfile as shown below.
The elements in the above configuration are described below:
Element Description url The URL of the database. The default port for a DB2 instance is 50000. username and password The name and password of the database user 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.
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. defaultAutoCommit
This property is not applicable to the Carbon database in WSO2 products because auto committing is usually handled at the code level, i.e., the default auto commit configuration specified for the RDBMS driver will be effective instead of this property element. Typically, auto committing is enabled for an RDBMS drivers by default.
When auto committing is enabled, each SQL statement will be committed to the database as an individual transaction, as opposed to committing multiple statements as a single transaction.
For more information on other parameters that can be defined in the <
master-datasources.xmlfile, see Tomcat JDBC Connection Pool.
- Add a new datasource with similar configurations as the
WSO2_CARBON_DBdatasource above to the <
master-datasources.xmlfile. Change its elements with your custom values. For instructions, see Setting up datasource configurations.
If you are setting up a separate database to store registry-related data, update the following configurations in the <
If you are setting up a separate database to store user management data, update the following configurations in the <
Creating database tables
To create the database tables, connect to the database that you created earlier and run the following scripts in the DB2 Express-C command editor.
To create tables in the registry and user manager database (
WSO2CARBON_DB), use the below script:
Restart the server.
You can create database tables automatically when starting the product for the first time by using the
-Dsetup parameter as follows:
Changing the product-specific/identity/storage databases
The topics above show how to change the
WSO2_CARBON_DB, which is used to store registry and user manager information. If you changed the product-specific database that come by default or set up a separate database for identity related data, the instructions are the same. In summary:
Add the datasource to the
master-datasources.xmlfile. The datasource for the product-specific database is already there in the
master-datasources.xmlfile by the name
Create the database tables using the following scripts:
For the product-specific database
Use the scripts in
For the identity database
Use the scripts in