Changing to Embedded H2

The following sections describe how to replace the default H2 database with Embedded H2:

Before you begin

Set up the database as explained in Setting up Embedded H2.
Download the H2 database driver and copy it to WSO2 IoT Server by following the steps under Setting up drivers.

Setting up configuration files

Configuration properties

Following are the datasource configuration properties:

Property	Description
url	The URL of the database.
userName	The name of the database user.
password	The password of the database user.
driverClassName	The class name of the database driver.
maxActive	The maximum number of active connections that can be allocated from this pool at the same time, or enter a negative value for no limit.
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 datasource xml file, see Tomcat JDBC Connection Pool.

Configuration files

Follow the steps given below to set up the configuration files:

The default datasource configuration is defined in the master-datasources.xml file, located in the <IoTS_HOME>/conf/datasources/ directory. The database configurations in registry.xml and user-mgt.xml refer to the WSO2_CARBON_DB datasource.

Edit the WSO2_CARBON_DB, WSO2_MB_STORE_DB and WSO2AM_DB datasources in the master-datasources.xml file by replacing the url, username, password and driverClassName settings with your custom values and also the other values accordingly.

WSO2_Carbon_DB Datasource

<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:repository/database/WSO2CARBON_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>
         <minIdle>5</minIdle>
         <testOnBorrow>true</testOnBorrow>
         <validationQuery>SELECT 1</validationQuery>
         <validationInterval>30000</validationInterval>
      </configuration>
   </definition>
</datasource>

WSO2_MB_STORE_DB Datasource

<datasource>
   <name>WSO2_MB_STORE_DB</name>
   <description>The datasource used for message broker database</description>
   <jndiConfig>
      <name>jdbc/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>
         <defaultAutoCommit>false</defaultAutoCommit>
      </configuration>
   </definition>
</datasource>

WSO2AM_DB Datasource

<datasource>
   <name>WSO2AM_DB</name>
   <description>The datasource used for API Manager database</description>
   <jndiConfig>
      <name>jdbc/WSO2AM_DB</name>
   </jndiConfig>
   <definition type="RDBMS">
      <configuration>
         <url>jdbc:h2:repository/database/WSO2AM_DB;DB_CLOSE_ON_EXIT=FALSE</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>

Configure the WSO2_ANALYTICS_EVENT_STORE_DB and WSO2_ANALYTICS_PROCESSED_DATA_STORE_DB datasources in the analytics-datasources.xml, located in the file <IoTS_HOME>/analytics/repository/conf/datasources directory.

Edit the WSO2_ANALYTICS_EVENT_STORE_DB and WSO2_ANALYTICS_PROCESSED_DATA_STORE_DB datasources in the analytics-datasources.xml file by replacing the url, username, password and driverClassName settings with your custom values and also the other values accordingly.

WSO2_ANALYTICS_EVENT_STORE_DB Datasource

<datasource>
   <name>WSO2_ANALYTICS_EVENT_STORE_DB</name>
   <description>The datasource used for analytics record store</description>
   <definition type="RDBMS">
      <configuration>
         <url>jdbc:h2:repository/database/ANALYTICS_EVENT_STORE;AUTO_SERVER=TRUE;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>
         <validationQuery>SELECT 1</validationQuery>
         <defaultAutoCommit>false</defaultAutoCommit>
         <initialSize>0</initialSize>
         <testWhileIdle>true</testWhileIdle>
         <minEvictableIdleTimeMillis>4000</minEvictableIdleTimeMillis>
      </configuration>
   </definition>
</datasource>

WSO2_ANALYTICS_PROCESSED_DATA_STORE_DB Datasource

<datasource>
   <name>WSO2_ANALYTICS_PROCESSED_DATA_STORE_DB</name>
   <description>The datasource used for analytics record store</description>
   <definition type="RDBMS">
      <configuration>
         <url>jdbc:h2:repository/database/ANALYTICS_PROCESSED_DATA_STORE;AUTO_SERVER=TRUE;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>
         <validationQuery>SELECT 1</validationQuery>
         <defaultAutoCommit>false</defaultAutoCommit>
         <initialSize>0</initialSize>
         <testWhileIdle>true</testWhileIdle>
         <minEvictableIdleTimeMillis>4000</minEvictableIdleTimeMillis>
      </configuration>
   </definition>
</datasource>

Configure the the WSO2_METRICS_DB datasource in the metrics-datasources.xml file, located in the file <IoTS_HOME>/conf/datasources directory.

Edit the WSO2_METRICS_DB datasources in the metrics-datasources.xml file by replacing the url, username, password, and driverClassName settings with your custom values and also the other values accordingly.

WSO2_METRICS_DB Datasource

<datasource>
   <name>WSO2_METRICS_DB</name>
   <description>The default datasource used for WSO2 Carbon Metrics</description>
   <jndiConfig>
      <name>jdbc/WSO2MetricsDB</name>
   </jndiConfig>
   <definition type="RDBMS">
      <configuration>
         <url>jdbc:h2:repository/database/WSO2METRICS_DB;DB_CLOSE_ON_EXIT=FALSE;AUTO_SERVER=TRUE</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>
         <defaultAutoCommit>true</defaultAutoCommit>
      </configuration>
   </definition>
</datasource>

Configure the the DM_DS datasource in the cdm-datasources.xml file located in the <IoTS_HOME>/conf/datasources directory.

Edit the DM_DS datasources in the cdm-datasources.xml file by replacing the url, username, password and driverClassName settings with your custom values and also the other values accordingly.

DM_DS Datasource

<datasource>
   <name>DM_DS</name>
   <description>The datasource used for CDM</description>
   <jndiConfig>
      <name>jdbc/DM_DS</name>
   </jndiConfig>
   <definition type="RDBMS">
      <configuration>
         <url>jdbc:h2:repository/database/WSO2DM_DB;DB_CLOSE_ON_EXIT=FALSE</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>

Configure all the device plugin datasources by editing the <PLUGIN_NAME>-datasources.xml file of the respective plugin by replacing the url, username, password and driverClassName settings with your custom values and also the other values accordingly.

Example: Android plugin datasource

<datasource>
    <name>Android_DB</name>
    <description>The datasource used as the Android Device Management database</description>
    <jndiConfig>
        <name>jdbc/MobileAndroidDM_DS</name>
    </jndiConfig>
    <definition type="RDBMS">
        <configuration>
            <url>jdbc:h2:repository/database/WSO2MobileAndroid_DB;DB_CLOSE_ON_EXIT=FALSE
            </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>

Creating database tables

Create the database tables either manually by running a script or automatically by using a startup parameter as described below.

Using the script

You can create the database tables manually by executing the H2 script in the shell or web console:

Database	DB Script name and Location
`WSO2_CARBON_DB`	`<IoTS_HOME>/dbscripts//h2.sql`
`WSO2AM_DB`	`<IoTS_HOME>/dbscripts//apimgt/h2.sql`
`WSO2_MB_STORE_DB`	`<IoTS_HOME>/wso2/broker/dbscripts/mb-store/h2.sql`
`WSO2_ANALYTICS_EVENT_STORE_DB`
`WSO2_ANALYTICS_PROCESSED_DATA_STORE_DB`
`WSO2_METRICS_DB`	`<IoTS_HOME>/dbscripts//metrics/h2.sql`
`DM_DS`	`<IoTS_HOME>/dbscripts//cdm/h2.sql`
Device plugin databases Example: `Arduino_DB`	`<IoTS_HOME>/dbscripts//cdm/plugins/<PLUGIN_NAME>/h2.sql` Example: `<IoTS_HOME>/dbscripts//cdm/plugins/android/h2.sql`

Follow the steps below to run the H2 script in web console:

The following steps need to be repeated to create database tables for the various databases.

Navigate to the folder with the respective dbscripts.
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.

After setting up all the database tables, start the server by executing one of the following commands:

For Linux:
```
sh wso2server.sh
```

For Windows:
```
wso2server.bat
```

Using a startup parameter

You can create database tables automatically when starting the product for the first time by using the -Dsetup parameter as follows:

For Linux:
```
sh wso2server.sh -Dsetup
```

For Windows:
```
wso2server.bat -Dsetup
```