Expert Consolidation in Oracle Database 12c by Martin Bach
By Martin Bach
Professional Consolidation in Oracle Database 12c is your key to decreasing facts administration expenses and extending facts heart potency. Consolidation and cloud computing are converging tendencies sweeping the undefined. a similar applied sciences permitting cloud computing let consolidation in addition, resulting in discount rates on all fronts from the quantity of strength used for servers to the volume of ground area fed on to the variety of directors had to deal with an deploy. but the consolidation procedure could be a lengthy and winding highway. good fortune calls for making plans, and attention to the affects on assisting infrastructure.
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In such a catastrophic state communication between cluster members is interrupted while the cluster nodes are still running. Adhering to its programming, the cluster software in each of the cluster halves will try to fail over resources of the nodes it considers crashed. The danger of data corruption looms here: if the application communicates with effectively unsynchronized cluster halves, different data can be written to disk. Oracle Clusterware uses a network and disk heartbeat to prevent a split brain scenario.
SQL> At the same time the DBA wants to move the August partition from fast storage to slow storage. 2. It is also the default for 12c: SQL> alter table part_demo move partition p_may_2013 tablespace tbs_arch_01; alter table part_demo move partition p_may_2013 tablespace tbs_arch_01 * ERROR at line 1: ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired The new syntax to perform the same operation online is shown here: SQL> alter table part_demo move partition P_MAY_2013 tablespace tbs_arch_01 online; Table altered.
A common solution to this kind of problem is the use of a before insert trigger. This way you can guarantee that there will always be a key value! A trigger however always means overhead. Consider this simple example: a table that requires a new key to be added using an ID column. SQL> > desc t1 Name Null? Type ------------------------------------ -------- ------------------------VC VARCHAR2(100) T TIMESTAMP(6) SQL> alter table t1 add id number; Table altered. SQL> alter table t1 add constraint 2 pk_t1 primary key(id); Table altered.