Sun Java System Application Server Enterprise Edition 8.1 2005Q2 Administration Reference

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## jdbc-connection-pool

Defines the properties that are required for creating a JDBC connection pool.

### Superelements

resources

### Subelements

The following table describes subelements for the `jdbc-connection-pool` element.

Table 1–74 `jdbc-connection-pool` Subelements

Element | Required | Description
--- | --- | ---
description | zero or one | Contains a text description of this element.
property | zero or more | Specifies a property or a variable.

### Attributes

The following table describes attributes for the `jdbc-connection-pool` element.

Table 1–75 `jdbc-connection-pool` Attributes

Attribute | Default | Description
--- | --- | ---
`name` | none | Specifies the name of the connection pool. A jdbc-resource element’s `pool-name` attribute refers to this `name`.
`datasource-classname` | none | Specifies the class name of the associated vendor-supplied data source. This class must implement `java.sql.DataSource`, `java.sql.XADataSource` , `javax.sql.ConnectionPoolDatasource`, or a combination.
`res-type` | `javax.sql. DataSource` | (optional) Specifies the interface the data source class implements. The value of this attribute can be `javax.sql.DataSource`, `javax.sql.XADataSource` , or `javax.sql.ConnectionPoolDatasource`. If the value is not one of these interfaces, the default is used. An error occurs if this attribute has a legal value and the indicated interface is not implemented by the data source class.
`steady-pool-size` | `8` | (optional) Specifies the initial and minimum number of connections maintained in the pool.
`max-pool-size` | `32` | (optional) Specifies the maximum number of connections that can be created to satisfy client requests.
`max-wait-time-in-millis` | `60000` | (optional) Specifies the amount of time, in milliseconds, that the caller is willing to wait for a connection. If `0`, the caller is blocked indefinitely until a resource is available or an error occurs.
`pool-resize-quantity` | `2` | (optional) Specifies the number of connections to be destroyed if the existing number of connections is above the `steady-pool-size` (subject to the `max-pool-size` limit). This is enforced periodically at the `idle-time-out-in-seconds` interval. An idle connection is one that has not been used for a period of `idle-time-out-in-seconds` .
`idle-timeout-in-seconds` | `300` | (optional) Specifies the maximum time that a connection can remain idle in the pool. After this amount of time, the pool can close this connection.
`transaction-isolation-level` | default JDBC driver isolation level | (optional) Specifies the transaction isolation level on the pooled database connections. Allowed values are `read-uncommitted`, `read-committed` , `repeatable-read`, or `serializable`. Applications that change the isolation level on a pooled connection programmatically risk polluting the pool, which can lead to errors. See `is-isolation-level-guaranteed` for more details.
`is-isolation-level-guaranteed` | `true` | (optional) Applicable only when `transaction-isolation-level` is explicitly set. If `true`, every connection obtained from the pool is guaranteed to have the desired isolation level. This might impact performance on some JDBC drivers. Only set this attribute to `false` if you are certain that the hosted applications do not return connections with altered isolation levels.
`is-connection-validation-required` | `false` | (optional) Specifies whether connections have to be validated before being given to the application. If a resource’s validation fails, it is destroyed, and a new resource is created and returned.
`connection-validation-method` | `auto-commit` | (optional) Legal values are as follows: `auto-commit` (default), which uses `Connection.setAutoCommit(Connection.getAutoCommit())` `meta-data`, which uses `Connection.getMetaData()` `table`, which performs a query on a table specified in the `validation-table-name` attribute
`validation-table-name` | none | (optional) Specifies the table name to be used to perform a query to validate a connection. This parameter is mandatory if and only if `connection-validation-type` is set to `table`.
`fail-all-connections` | `false` | (optional) If `true`, closes all connections in the pool if a single validation check fails. This parameter is mandatory if and only if `is-connection-validation-required` is set to `true`.

### Properties

Most JDBC 3.0 drivers allow use of standard property lists to specify the user, password, and other resource configuration information. Although properties are optional with respect to the Application Server, some properties might be necessary for most databases. For details, see the JDBC 3.0 Standard Extension API.

When properties are specified, they are passed to the vendor’s data source class (specified by the `datasource-classname` attribute) as is using setName(value) methods.

The `user` and `password` properties are used as the default principal if container managed authentication is specified and a `default-resource-principal` is not found in the application deployment descriptors.

The following table describes some common properties for the `jdbc-connection-pool` element.

Table 1–76 `jdbc-connection-pool` Properties

Property | Description
--- | ---
`user` | Specifies the user name for this connection pool.
`password` | Specifies the password for this connection pool.
`databaseName` | Specifies the database for this connection pool.
`serverName` | Specifies the database server for this connection pool.
`port` | Specifies the port on which the database server listens for requests.
`networkProtocol` | Specifies the communication protocol.
`roleName` | Specifies the initial SQL role name.
`datasourceName` | Specifies an underlying `XADataSource`, or a `ConnectionPoolDataSource` if connection pooling is done.
`description` | Specifies a text description.
`url` | Specifies the URL for this connection pool. Although this is not a standard property, it is commonly used.

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