

Changing to PostgreSQL¶

By default, MWARE ESB uses the embedded H2 database as the database for storing user management and registry data. Given below are the instructions you need to follow in order to use PostgreSQL for this purpose.

Setting up PostgreSQL¶

The following sections describe how to set up PostgreSQL database to replace the default H2 database in your MWARE product.

Setting up the database and users
Setting up the drivers
Executing db scripts to create tables on PostgreSQL database

Setting up the database and users¶

Follow the instructions below to set up the PostgreSQL database and users.

Login to PostgreSQL using a client (e.g. psql). Enter the following command in a command prompt, where USER_NAME is the username that you will use to access the databases and POSTGRE_HOST_IP is the IP of the host of PostgreSQL server.

psql -h <POSTGRE_HOST_IP> -U <USER_NAME> -W

When prompted, specify the password that will be used to access the databases with the username you specified.
In the PostgreSQL command prompt, create the database using the following command:

postgres# CREATE DATABASE <DATABASE_NAME>;

Give authorization to the user you use to access the databases as follows.

For example, let's consider apimadmin as the user.
```
postgres# grant all privileges on database <DATABASE_NAME> to apimadmin;
```
Log out from the Postgres command prompt by executing the following command:

postgres# quit;

Setting up the drivers¶

Unzip the MWARE ESB pack. Let's refer to it as <API-M_HOME>.
Download the PostgreSQL JDBC driver.
Copy it to the <API-M_HOME>/repository/components/lib/ directory.

Executing db scripts to create tables on PostgreSQL database¶

To create tables in the registry and user manager database (WSO2_SHARED_DB), execute the relevant script as shown below.

For example, take shared_db as the database.
```
psql -U <USER_NAME> -d shared_db -f <API-M_HOME>/dbscripts/postgresql.sql -W
```
To create tables in the apim database (WSO2AM_DB), execute the relevant script as shown below.

For example, take apim_db as the database
```
psql -U <USER_NAME> -d apim_db -f <API-M_HOME>/dbscripts/apimgt/postgresql.sql  -W
```

Note

As the WSO2_MB_STORE DB is not shared and does not contain data that needs to be migrated, it is recommended to use the default H2 for WSO2_MB_STORE_DB even in production.

Troubleshooting

If you encounter the following error while using the default H2 database as the MB store database, follow the instructions in this section. Note that this error will only occur if the MB store database is corrupted.

ERROR ApplicationRegistry org.wso2.andes.kernel.AndesException: Connecting to database failed with jndi lookup : WSO2MBStoreDB. data source username : wso2carbon. SQL Error message : General error: java.lang.ArrayIndexOutOfBoundsException

Replace the MB store database with the default H2 MB store database from a fresh MWARE ESB distribution.
Restart the server.

Changing the database to PostgreSQL¶

Creating the datasource connection to PostgreSQL

Creating the datasource connection to PostgreSQL¶

A datasource is used to establish the connection to a database. By default, WSO2_SHARED_DB and WSO2AM_DB datasource are configured in the deployment.toml file for the purpose of connecting to the default H2 databases.

After setting up the PostgreSQL database to replace the default H2 database, either change the default configurations of the WSO2_SHARED_DB and WSO2AM_DB datasources, or configure a new datasource to point it to the new database as explained below.

Note

If you are configuring API-M in a distributed setup, do the changes in all the MWARE ESB components.

Follow the instructions below to change the type of the default datasource.

Open the <API-M_HOME>/repository/conf/deployment.toml configuration file and locate the [database.shared_db] and [database.apim_db] configuration elements.

You simply have to update the URL pointing to your PostgreSQL database, the username, and password required to access the database and the PostgreSQL driver details as shown below.

Element	Description
type	The database type used
url	The URL of the database. The default port for PostgreSQL is 5432
username and password	The name and password of the database user
driverClassName	The class name of the database driver
validationQuery	The SQL query that will be used to validate connections from this pool before returning them to the caller.

Sample configuration is shown below:

Format

type = "postgre"
url = "jdbc:postgresql://localhost:5432/<DATABASE_NAME>"
username = "<USER_NAME>"
password = "<PASSWORD>"
driver = "org.postgresql.Driver"
validationQuery = "SELECT 1"

Example

[database.shared_db]
type = "postgre"
url = "jdbc:postgresql://localhost:5432/shared_db"
username = "sharedadmin"
password = "sharedadmin"
driver = "org.postgresql.Driver"
validationQuery = "SELECT 1"

[database.apim_db]
type = "postgre"
url = "jdbc:postgresql://localhost:5432/apim_db"
username = "apimadmin"
password = "apimadmin"
driver = "org.postgresql.Driver"
validationQuery = "SELECT 1"

You can update the configuration elements given below for your database connection.

Element	Description
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.
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 MWARE 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 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.
commitOnReturn	If `defaultAutoCommit =false`, then you can set `commitOnReturn =true`, so that the pool can complete the transaction by calling the commit on the connection as it is returned to the pool. However, If `rollbackOnReturn =true` then this attribute is ignored. The default value is false.
rollbackOnReturn	If `defaultAutoCommit =false`, then you can set `rollbackOnReturn =true` so that the pool can terminate the transaction by calling rollback on the connection as it is returned to the pool. The default value is false.

Sample configuration is shown below:

Format

type = "postgre"
url = "jdbc:postgresql://localhost:5432/<DATABASE_NAME>"
username = "<USER_NAME>"
password = "<PASSWORD>"
driver = "org.postgresql.Driver"
validationQuery = "SELECT 1"
pool_options.<OPTION-1> = <VALUE-1>
pool_options.<OPTION-2> = <VALUE-2>
...

Example

[database.shared_db]
type = "postgre"
url = "jdbc:postgresql://localhost:5432/shared_db"
username = "sharedadmin"
password = "sharedadmin"
driver = "org.postgresql.Driver"
validationQuery = "SELECT 1"
pool_options.maxActive = 100
pool_options.maxWait = 10000
pool_options.validationInterval = 10000

[database.apim_db]
type = "postgre"
url = "jdbc:postgresql://localhost:5432/apim_db"
username = "apimadmin"
password = "apimadmin"
driver = "org.postgresql.Driver"
validationQuery = "SELECT 1"
pool_options.maxActive = 50
pool_options.maxWait = 30000

Info

For more information on other parameters that can be defined in the <API-M_HOME>/repository/conf/deployment.toml file, see Tomcat JDBC Connection Pool.

Restart the server.

Note

To give the Key Manager, Publisher, and Developer Portal components access to the user management data with shared permissions, JDBCUserStoreManager has been configured by default. For more information, refer Configuring Userstores.
Info

Changing WSO2CARBON_DB to PostgreSQL

By default WSO2CARBON_DB will be an embedded H2 database and it is not necessary to change it to another database. But if you have a requirement to change it, you can follow the below steps. (When changing the carbon database, make sure that each server node have its own WSO2CARBON_DB. If you don't want to change the carbon database, then you can ignore this section.)
- Create tables in the carbon database (WSO2CARBON_DB) using the script <API-M_HOME>/dbscripts/postgresql.sql.
- Open the <API-M_HOME>/repository/conf/deployment.toml configuration file. Locate the [database.local] configuration element and update the URL pointing to your PostgreSQL database, the username, and password required to access the database and the PostgreSQL driver details similarly as explained before.
Example
```
[database.local]
type = "postgre"
url = "jdbc:postgresql://localhost:5432/carbon_db"
username = "carbonadmin"
password = "carbonadmin"
driver = "org.postgresql.Driver"
validationQuery = "SELECT 1"
```

Top