Setting up with Remote H2

The following sections describe how to replace the default H2 databases with Remote H2.

Preparing the remote H2 database

Follow the steps below to set up a Remote H2: database.

Download and install the H2 database engine on your computer as follows.

For instructions on installing, see the H2 installation guide.
Go to the <H2_HOME>/bin/ directory and run the H2 network server starting script as follows, where <H2_HOME> is the H2 installation directory:
Run the H2 database server with the following commands:
- For Linux:
```
$ ./h2.sh
```
- For Windows:
```
$ h2.bat
```
The script starts the database engine and opens a pop-up window.
Click Start Browser to open a web browser containing a client application, which you use to connect to a database. If a database does not already exist by the name you provided in the JDBC URL text box, H2 will automatically create a database.

Setting up drivers

WSO2 currently ships H2 database engine version h2-1.2.140.* and its related H2 database driver. If you want to use a different H2 database driver, take the following steps:

Delete the following H2 database-related JAR file, which is shipped with WSO2 products:
<MB_HOME>/repository/components/plugins/h2-database-engine_1.2.140.wso2v3.jar
Find the JAR file of the new H2 database driver (<H2_HOME>/bin/h2-*.jar, where <H2_HOME> is the H2 installation directory) and copy it to your WSO2 product's <MB_HOME>/repository/components/lib/ directory.

Setting up datasource configurations

After creating the database, you create a datasource to point to it in the following files:

Edit the default configuration for the WSO2_CARBON_DB datasource in the <MB_HOME>/repository/conf/datasources/m aster-datasources.xml file. Replace the url, username, password and driverClassName settings with your custom values and also the other values accordingly as shown below:

<datasource>
      <name>WSO2_CARBON_DB</name>
      <description>The datasource used for registry and user manager</description>
      <jndiConfig>
           <name>jdbc/WSO2CarbonDB</name>
      </jndiConfig>
      <definition type="RDBMS">
           <configuration>
               <url>jdbc:h2:tcp://localhost/~/registryDB;create=true</url>
               <username>regadmin</username>
               <password>regadmin</password>
               <driverClassName>org.h2.Driver</driverClassName>
               <maxActive>80</maxActive>
               <maxWait>60000</maxWait>
               <minIdle>5</minIdle>
               <testOnBorrow>true</testOnBorrow>
               <validationQuery>SELECT 1</validationQuery>
               <validationInterval>30000</validationInterval>
           </configuration>
      </definition>
</datasource>

Edit the WSO2_MB_STORE_DB datasource configuration in the same file as shown below.

<datasource>
    <name>WSO2_MB_STORE_DB</name>
           <jndiConfig>
                <name>WSO2MBStoreDB</name>
           </jndiConfig>
           <definition type="RDBMS">
                  <configuration>
                      <url>jdbc:h2:repository/database/WSO2MB_DB;DB_CLOSE_ON_EXIT=FALSE;LOCK_TIMEOUT=60000</url>
                      <username>wso2carbon</username>
                      <password>wso2carbon</password> 
                      <driverClassName>org.h2.Driver</driverClassName>
                      <maxActive>50</maxActive>
                      <maxWait>60000</maxWait>
                      <testOnBorrow>true</testOnBorrow>
                      <validationQuery>SELECT 1</validationQuery>
                      <validationInterval>30000</validationInterval>
                  </configuration>
            </definition>
</datasource>

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.
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.

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

Similarly, edit the database configurations in <MB_HOME>/repository/conf/ registry.xml, <MB_HOME>/repository/conf/ user-mgt.xml and<MB_HOME>/repository/conf/identity.xml files as well.

Creating database tables

To create the database tables, connect to the database that you created earlier and run the following scripts in H2 shell or web console:

To create tables in the registry and user manager database (WSO2CARBON_DB), use the below script:
```
<MB_HOME>/dbscripts/h2.sql
```

Follow the steps below to run the script in web console:

Run the ./h2.sh command to start the web console.
Copy the script text from the SQL file.
Paste it into the console.
Click Run.
Restart the server.
You can create database tables automatically when starting the product for the first time by using the -Dsetup parameter as follows:
- For Windows: <MB_HOME>/bin/wso2server.bat -Dsetup
- For Linux: <MB_HOME>/bin/wso2server.sh -Dsetup