Very clear article about oracle dataguard
http://www.dbazine.com/oracle/or-articles/liu4
Category: Oracle
oracle fast start failover best practice
http://www.oracle.com/technology/deploy/availability/pdf/MAA_WP_10gR2_FastStartFailoverBestPractices.pdf
Difference between SYNC and AFFIRM
LGWR SYNC AFFIRM in Oracle Data Guard is used for zero data loss. How does one ensure zero data loss? Well, the redo block generated at the primary has to reach the standby across the network (that’s where the SYNC part comes in – i.e. it is a synchronous network call), and then the block…
useful dg links
http://www.oracle.com/technology/obe/11gr2_db_prod/ha/dataguard/dg_broker/dg_broker.htm http://www.oracle.com/technology/obe/11gr2_db_prod/ha/dataguard/activedg/activedg.htm http://www.oracle.com/technology/obe/11gr2_db_prod/ha/dataguard/physstby/physstdby.htm
Does DBMS_JOB recompute the NEXT_DATE interval after or before
goal: Does DBMS_JOB recompute the NEXT_DATE interval after or before executing the procedure or job? fact: PL/SQL fix: The NEXT_DATE is computed AFTER the job gets executed successfully. The INTERVAL date function is evaluated immediately before a job is executed. If the job completes successfully, the date calculated from INTERVAL becomes the new NEXT_DATE. If…
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Committing distributed transaction using commit force
Committing Using Only the Transaction ID The following SQL statement commits an in-doubt transaction: COMMIT FORCE ‘transaction_id’; The variable transaction_id is the identifier of the transaction as specified in either the LOCAL_TRAN_ID or GLOBAL_TRAN_ID columns of the DBA_2PC_PENDING data dictionary view. For example, assume that you query DBA_2PC_PENDING and determine that LOCAL_TRAN_ID for a distributed…
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Rollback force for distributed transactions
FORCE Clause Specify FORCE to manually roll back an in-doubt distributed transaction. The transaction is identified by the text containing its local or global transaction ID. To find the IDs of such transactions, query the data dictionary view DBA_2PC_PENDING. A ROLLBACK statement with a FORCE clause rolls back only the specified transaction. Such a statement…
How to find password change date for user
Check user$ table for same.
switchover for primary database
ALTER DATABASE commit TO switchover TO physical PRIMARY WITH session shutdown nowait;
Physical Standby switchover with session active
In order to perform a switchover all sessions to the database need to be disconnected. In version 901 this was a manual process. In version 9.2.0 this process has been automated with the “with session shutdown” clause that has been added to the alter database commit to switchover command. If SWITCHOVER_STATUS returns SESSIONS ACTIVE then…
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