BEA recommends using one of the following methods of handling failover instead. The following sections describe configuration options and requirements:. The following table may help you as you try to determine which configuration is right for your particular application:. Does Your Application Require.
MultiPools offer failover for global transactions without the limitations and known issues associated with a connection pool configuration with connect-time failover. When WebLogic Server tests a connection and the connection fails, it attempts to recreate the connection.
If that attempt fails, the server disables the connection pool and routes connection requests to other connection pools which correspond to other RAC nodes in the MultiPool. WebLogic Server periodically tries to recreate the database connections in the disabled connection pool.
When WebLogic Server is successful in recreating the connections, it next re-enables the connection pool and begins routing connection requests to the connection pool again. Because of the connection request routing and automatic health checking features, there is minimal delay in satisfying connection requests after a failure compared to when relying on the Oracle Thin driver connect-time failover configuration. When WebLogic Server tests a connection and the connection fails, the server replaces it by getting a new connection, and the driver again determines which RAC instance to use based on instance availability.
With this attribute setting, when a connection fails a connection test the first time, WebLogic Server automatically closes all connections in the connection pool. WebLogic Server replaces the connection with a new one, relying on the driver to determine to which node it should connect.
WebLogic Server tests the new connection before satisfying the request. Occasionally, when one RAC node fails over to another, there may be a delay before the data associated with a transaction branch in progress on the now failed node is available throughout the cluster.
This prevents incomplete transactions from being properly completed, which could further result in data locking in the database. XARetryDurationSeconds controls the period of time during which WebLogic Server will repeatedly retry XA operations such as recover, commit and rollback for pending transactions. XARetryIntervalSeconds controls the frequency of the retry attempts within the established time period.
To enable this feature, you must manually edit your config. Admin command line utility or a JMX program. Note: It is generally better to set XARetryDurationSeconds higher than minimally necessary to make sure that all transactions are completed properly. Setting the value higher than minimally required should not affect application performance during normal operations.
The additional processing only affects transactions that have been prepared but have failed to complete. This value determines the time between XA retry calls.
By default, the value is 60 seconds. Decreasing the value will decrease the amount of time between XA retry attempts. The default value should suffice in most cases. What happens to inflight transactions to a database node if that node fails? When the primary Oracle RAC node fails? Does WebLogic Server support transparent failover? To answer these and other questions about how WebLogic Server handles failures, let's walk through the transaction processing steps and describe how a failure would be handled at each stage along the way.
The first stage at which a failure may occur is before the application calls for the transaction to be committed. If a database or RAC node fails at this stage, the application receives an exception and must get a new connection and make a new attempt at processing the transaction.
WebLogic Server does not support transparent failover. If a failure occurs after the application has called for the transaction to be committed, the handling of any in-flight transaction depends upon whether the PREPARE operation is complete. If the PREPARE operation is not complete, the transaction manager rolls back the transaction and sends the application an exception for the failed transaction.
If the PREPARE operation is complete, the transaction manager attempts to drive the in-flight transaction to completion using another node. Note that the connection is blocked during these attempts. If the COMMIT operation is not successful during the first set of retry attempts, the application receives an exception. The transaction manager then continues to retry the COMMIT operation periodically until it is successful; if the transaction cannot be completed successfully within the abandon time period, the transaction is driven to completion heuristically.
Then configure a MultiPool, using either the algorithm for load balancing or the algorithm for high availability, and add the connection pools to it. Figure A-3 shows a typical MultiPool configuration. Share Tweet Share. Oracle WebLogic Server 10g R3 Oracle recently released WebLogic Server 10g Release 3 Thank you Phani Reply.
Regards, Harry D Reply. Thanks in advance, Naveen. Ranjithkumar says June 13, Hello every one, 1 we have one Managed Server, in that we have deployed the application and that MS maintenance the log file size up to 1mb. SD says February 21, I need one help from you in Weblogic version From here you can download the historical BEA releases.
You get the following releases that can be downloaded from here. Oracle Weblogic Server - Version: 6. Hope this helps. Thanks, Vipin. Eduardo Plata. Does someone know where can I get weblogic 8. Oracle has restricted downloads and I have no metalink account. I need AIX version Thanks in advance.
I wan't the weblogic 8. It works for me, as do the instructions I posted on March 04, Do you have a CID? The number OracleCallableStatement extends java. Table OraclePreparedStatement Interface. The following tables list the extensions to the java.
Table OracleThinBlob Interface. Table OracleThinClob Interface. All rights reserved. Required browser: Netscape 4. Supports Local Transaction. OracleConnection extends java. Connection continued. SQLException; java. Properties getDBAccessProperties throws java. SQLException; void archive int i, int j, String s throws java.
SQLException; void logicalClose throws java. SQLException; void needLine throws java. SQLException; void printState throws java. SQLException; void releaseLine throws java. SQLException; void shutdown int i throws java. SQLException; void startup String s, int i throws java. OracleStatement extends java. String getOriginalSql throws java. SQLException; int creationState throws java. SQLException; int sendBatch throws java. SQLException; void clearDefines throws java.
SQLException; void describe throws java. OracleResultSet extends java. ResultSet getCursor int n throws java.
ResultSet getCursor int i throws java. InputStream getAsciiStream int i throws java. InputStream getBinaryStream int i throws java.
0コメント