1.What are new features of datapump in 12c? https://oracle-base.com/articles/12c/data-pump-enhancements-12cr1 2.which case we need to use flashback_time or flashback_scn parameter? If you need consistent backup for example when you do initial load using datapump for golden gate. 3.During impdp with full=y caluse , do we need to create user before import? No.User will be automatically created. 4.which memory area expdp and […]
Listener related questions:- Answer Credit:- https://www.linkedin.com/in/saibal-ghosh-ccsk-prince2-%C2%AE-469b0a7/ 1.Can we manually force a particular scan ip (out of the three) to relocate on a particular host (lets say – on node 5 of 5 node RAC) ? Ans:- srvctl relocate scan_LISTENER -i 1 -n node1 $ srvctl relocate scan -h Usage: srvctl relocate scan -i <ordinal_number> [-n <node_name>] -i <scan_ordinal_number> Ordinal number […]
Clustering Factor and it’s effect on non-assm and assm tablespace. The clustering factor is a measure of the ordernesss of an index in comparison to the table that it is based on. It is used to check the cost of a table lookup following an index access (multiplying the clustering factor by the index’s selectivity gives you the cost of […]
A. B-Tree Indexes I have discussed more details in the below blog. http://clouddba.co/index-internal-oracle-using-simple-test-case/ B.Invisible Indexes Deciding which columns to index is hard. The primary key is automatically indexed, the foreign keys should also be indexed, but then what? Even more difficult is deciding which index to remove that might be a bad index. Every time a record is inserted, all […]
Index internal oracle using simple test case First of all I will create a table with char(1000) so that in one block I can fit 6-7 entries . Here are some relevant notes regarding Index split For Leaf block kdxlespl: bytes of uncommitted data at time of block split that have been cleaned out kdxlende: number of deleted entries kdxlenxt: […]