JDBCConnectionPoolParamsBean


Overview  |   Related MBeans  |   Attributes  |   Operations

Overview

Contains the connection pool parameters of a data source.

Configuration parameters for a data source's connection pool are specified using the connection pool parameters bean.

       
Security rolesThe following roles have read, write, and invoke permission for all non-encrypted attributes and operations in this MBean:
  • Deployer
Fully Qualified Interface NameIf you use the getMBeanInfo operation in MBeanTypeServiceMBean, supply the following value as this MBean's fully qualified interface name:
weblogic.j2ee.descriptor.wl.JDBCConnectionPoolParamsBean
Factory Methods No factory methods. Instances of this MBean are created automatically.


Attributes

This section describes the following attributes:


CapacityIncrement

The number of connections created when new connections are added to the connection pool.

When there are no more available physical connections to satisfy connection requests, WebLogic Server creates this number of additional physical connections and adds them to the connection pool.

       
Privileges Read/Write
Typeint
Default Value1
Minimum value1
Maximum value2147483647

ConnectionCreationRetryFrequencySeconds

The number of seconds between attempts to establish connections to the database.

If you do not set this value, data source creation fails if the database is unavailable. If set and if the database is unavailable when the data source is created, WebLogic Server will attempt to create connections in the pool again after the number of seconds you specify, and will continue to attempt to create the connections until it succeeds.

When set to 0, connection retry is disabled.

       
Privileges Read/Write
Typeint
Default Value0
Minimum value0
Maximum value2147483647

ConnectionReserveTimeoutSeconds

The number of seconds after which a call to reserve a connection from the connection pool will timeout.

When set to 0, a call will never timeout.

When set to -1, a call will timeout immediately.

       
Privileges Read/Write
Typeint
Default Value10
Minimum value-1
Maximum value2147483647

CredentialMappingEnabled

Enables credential mapping for the data source. When an application requests a database connection, WebLogic Server sets a light-weight client ID on the database connection based on a map of database IDs.

You must also specify the map of WebLogic Server user IDs to database user IDs (credential mapping).

This feature relies on features in the JDBC driver and DBMS. It is not supported with all drivers and DBMSs.

       
Privileges Read/Write
Typeboolean

DriverInterceptor

Specifies the absolute name of the application class used to intercept method calls to the JDBC driver. The application specified must implement the weblogic.jdbc.extensions.DriverInterceptor interface.

Weblogic Server will invoke the preInvokeCallback(), postInvokeExceptionCallback(), and postInvokeCallback() methods of the registered application before and after invoking any method inside the JDBC driver. You can use this feature to profile JDBC driver usage and monitor:

       
Privileges Read/Write
Typejava.lang.String

HighestNumWaiters

The maximum number of connection requests that can concurrently block threads while waiting to reserve a connection from the data source's connection pool.

       
Privileges Read/Write
Typeint
Default Value2147483647
Minimum value0
Maximum value2147483647

IdentityBasedConnectionPoolingEnabled

Enables identity-based-connection-pooling for the data source. When an application requests a database connection, WebLogic Server picks or creates a physical connection with requested DBMS identity based on a map of WebLogic user IDs and database IDs.

You must also specify the map of WebLogic Server user IDs to database user IDs (credential mapping).

       
Privileges Read/Write
Typeboolean

IgnoreInUseConnectionsEnabled

Enables the data source to be shutdown even if connections obtained from the pool are still in use.

       
Privileges Read/Write
Typeboolean
Default Valuetrue

InactiveConnectionTimeoutSeconds

The number of inactive seconds on a reserved connection before WebLogic Server reclaims the connection and releases it back into the connection pool.

You can use the Inactive Connection Timeout feature to reclaim leaked connections - connections that were not explicitly closed by the application. Note that this feature is not intended to be used in place of properly closing connections.

When set to 0, the feature is disabled.

       
Privileges Read/Write
Typeint
Default Value0
Minimum value0
Maximum value2147483647

InitialCapacity

The number of physical connections to create when creating the connection pool in the data source. If unable to create this number of connections, creation of the data source will fail.

This is also the minimum number of physical connections the connection pool will keep available.

       
Privileges Read/Write
Typeint
Default Value1
Minimum value0
Maximum value2147483647

InitSql

SQL statement to execute that will initialize newly created physical database connections. Start the statement with SQL followed by a space.

If the Init SQL value begins with "SQL ", then the rest of the string following that leading token will be taken as a literal SQL statement that will be used to initialize database connections. If the Init SQL value does not begin with "SQL ", the value will be treated as the name of a table and the following SQL statement will be used to initialize connections:
"select count(*) from InitSQL"

The table InitSQL must exist and be accessible to the database user for the connection. Most database servers optimize this SQL to avoid a table scan, but it is still a good idea to set InitSQL to the name of a table that is known to have few rows, or even no rows.

       
Privileges Read/Write
Typejava.lang.String

JDBCXADebugLevel

Specifies level of JDBC debugging for XA drivers, where larger values in the range provide more debugging information.

       
Privileges Read/Write
Typeint
Default Value10
Minimum value0
Maximum value100

LoginDelaySeconds

The number of seconds to delay before creating each physical database connection. This delay supports database servers that cannot handle multiple connection requests in rapid succession.

The delay takes place both during initial data source creation and during the lifetime of the data source whenever a physical database connection is created.

       
Privileges Read/Write
Typeint
Default Value0
Minimum value0
Maximum value2147483647

MaxCapacity

The maximum number of physical connections that this connection pool can contain.

       
Privileges Read/Write
Typeint
Default Value15
Minimum value1
Maximum value2147483647

PinnedToThread

PinnedToThread is an option that can improve performance by enabling execute threads to keep a pooled database connection even after the application closes the logical connection.

When PinnedToThread is enabled, WebLogic Server pins a database connection from the connection pool to an execution thread the first time an application uses the thread to reserve a connection. When the application finishes using the connection and calls connection.close(), which otherwise returns the connection to the connection pool, WebLogic Server keeps the connection with the execute thread and does not return it to the connection pool. When an application subsequently requests a connection using the same execute thread, WebLogic Server provides the connection already reserved by the thread.

With PinnedToThread, there is no locking contention on the connection pool that occurs when multiple threads attempt to reserve a connection at the same time and there is no contention for threads that attempt to reserve the same connection from a limited number of database connections.

If an application concurrently reserves more than one connection from the connection pool using the same execute thread, WebLogic Server creates additional database connections and pins them to the thread, as well.

       
Privileges Read/Write
Typeboolean

ProfileHarvestFrequencySeconds

The number of seconds between when WebLogic Server harvests profile data.

When set to 0, harvesting of data is disabled.

       
Privileges Read/Write
Typeint
Default Value300
Minimum value0
Maximum value2147483647

ProfileType

Specifies that type of profile data to be collected for the JDBC subsystem.

You can specify combinations of the following profile types:

       
Privileges Read/Write
Typeint
Default Value0

RemoveInfectedConnections

Specifies whether a connection will be removed from the connection pool after the application uses the underlying vendor connection object.

If you disable removing infected connections, you must make sure that the database connection is suitable for reuse by other applications.

When set to true (the default), the physical connection is not returned to the connection pool after the application closes the logical connection. Instead, the physical connection is closed and recreated.

When set to false, when the application closes the logical connection, the physical connection is returned to the connection pool and can be reused by the application or by another application.

       
Privileges Read/Write
Typeboolean
Default Valuetrue

SecondsToTrustAnIdlePoolConnection

The number of seconds within a connection use that WebLogic Server trusts that the connection is still viable and will skip the connection test, either before delivering it to an application or during the periodic connection testing process.

This option is an optimization that minimizes the performance impact of connection testing, especially during heavy traffic.

       
Privileges Read/Write
Typeint
Default Value10
Minimum value0
Maximum value2147483647

ShrinkFrequencySeconds

The number of seconds to wait before shrinking a connection pool that has incrementally increased to meet demand.

When set to 0, shrinking is disabled.

       
Privileges Read/Write
Typeint
Default Value900
Minimum value0
Maximum value2147483647

StatementCacheSize

The number of prepared and callable statements stored in the cache. (This may increase server performance.)

WebLogic Server can reuse statements in the cache without reloading the statements, which can increase server performance. Each connection in the connection pool has its own cache of statements.

Setting the size of the statement cache to 0 turns off statement caching.

       
Privileges Read/Write
Typeint
Default Value10
Minimum value0
Maximum value1024

StatementCacheType

The algorithm used for maintaining the prepared statements stored in the statement cache.

Options are:



       
Privileges Read/Write
Typejava.lang.String
Default ValueLRU
Legal Values
  • LRU
  • FIXED

StatementTimeout

The time after which a statement currently being executed will time out.

StatementTimeout relies on underlying JDBC driver support. WebLogic Server passes the time specified to the JDBC driver using the java.sql.Statement.setQueryTimeout() method. If your JDBC driver does not support this method, it may throw an exception and the timeout value is ignored.

A value of -1 disables this feature.

A value of 0 means that statements will not time out.

       
Privileges Read/Write
Typeint
Default Value-1
Minimum value-1
Maximum value2147483647

TestConnectionsOnReserve

Enables WebLogic Server to test a connection before giving it to a client. (Requires that you specify a Test Table Name.)

The test adds a small delay in serving the client's request for a connection from the pool, but ensures that the client receives a viable connection.

       
Privileges Read/Write
Typeboolean

TestFrequencySeconds

The number of seconds a WebLogic Server instance waits between attempts when testing unused connections. (Requires that you specify a Test Table Name.) Connections that fail the test are closed and reopened to re-establish a valid physical connection. If the test fails again, the connection is closed.

In the context of multi data sources, this attribute controls the frequency at which WebLogic Server checks the health of data sources it had previously marked as unhealthy.

When set to 0, the feature is disabled.

       
Privileges Read/Write
Typeint
Default Value120
Minimum value0
Maximum value2147483647

TestTableName

The name of the database table to use when testing physical database connections. This name is required when you specify a Test Frequency and enable Test Reserved Connections.

The default SQL code used to test a connection is "select count(*) from TestTableName"

Most database servers optimize this SQL to avoid a table scan, but it is still a good idea to set the Test Table Name to the name of a table that is known to have few rows, or even no rows.

If the Test Table Name begins with "SQL ", then the rest of the string following that leading token will be taken as a literal SQL statement that will be used to test connections instead of the standard query. For example: SQL BEGIN; Null; END;

       
Privileges Read/Write
Typejava.lang.String

WrapTypes

By default, data type objects for Array, Blob, Clob, NClob, Ref, SQLXML, and Struct, plus ParameterMetaData and ResultSetMetaData objects are wrapped with a WebLogic wrapper. This allows for features like debugging and connection usage to be done by the server.

The wrapping can be turned off by setting this value to false. This improves performance, in some cases significantly, and allows for the application to use the native driver objects directly.

       
Privileges Read/Write
Typeboolean
Default Valuetrue


Operations

This section describes the following operations:


    isSet

    Return true if the given property has been explicitly set in this bean.

       
    Operation Name"isSet"
    ParametersObject [] {  propertyName }

    where:

    • propertyName is an object of type java.lang.String that specifies:

      property to check

    SignatureString [] { "java.lang.String" }
    Returns boolean
    Exceptions
    • java.lang.IllegalArgumentException
      IllegalArgumentException if propertyName is not a recognized property

    unSet

    Restore the given property to its default value.

       
    Operation Name"unSet"
    ParametersObject [] {  propertyName }

    where:

    • propertyName is an object of type java.lang.String that specifies:

      property to restore

    SignatureString [] { "java.lang.String" }
    Returns void
    Exceptions
    • java.lang.IllegalArgumentException
      UnsupportedOperationException if called on a runtime implementation.