Result Cache in Oracle

Oracle 11g has introduced another feature, is RESULT_CACHE. By using this you can actually ask oracle to cache the result of the function call that you made with actual parameter values. Whenever you call the same function next time, Oracle will not execute the function again but, will return the result from Cache. This caching is at Server level. So different sessions can share their results.
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IP – Based Storage Area Network Configuration using iSCSI

Standard configuration options Tool provided by Storage vendors OpenFiler Open source DOS Manual Setup using iSCSI protocol Target is the storage server and Initiator is the client. Target (Ubuntu 12.04) Ø Install iscsitarget, iscsitarget-source, iscsitarget-dkms package Ø Format the disk and create the partitions as per your requirements. ( I have 10 GB for OCR &Voting Disk; 61 GB for oracle storage). Ø edit /etc/default/iscsitarget . Change the default value of ISCSITARGET_ENABLE=false over to ISCSITARGET_ENABLE=true. Ø Define LUNs in /etc/iet/ietd.conf Target iqn.2012-08.in.co.persistent:storage.disk0. pts0012 LUN 0 Path =/dev/cciss/c0d1p5,Type=fileio,ScsiId=lun0,ScsiSN=lun0 Node: ― 0th LUN is mandatory. ― ...

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Drop all Objects from Schema In Postgres

To Drop all objects from Postgres Schema there could be following two approaches: Drop Schema with cascade all and re-create it again. In some cases where you dont want to/not allowed to drop and recreate schema, its easy to look for objects on current schema and drop them. following script would help to do so, Create function which would do the task and then drop that function too. --- CREATE OR REPLACE FUNCTION drop_DB_objects() RETURNS VOID AS $$ DECLARE rd_object RECORD; v_idx_statement VARCHAR(500); BEGIN ---1. Dropping all stored functions RAISE NOTICE '%', 'Dropping all stored functions...'; FOR rd_object IN ( SELECT format('%I.%I(%s)', ns.nspname, p.proname, oidvectortypes(p.proargtypes)) as functionDef FROM pg_proc p INNER JOIN pg_namespace ns ON (p.pronamespace = ns.oid) WHERE ns.nspname = current_schema AND p.proname <...

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Distributed transaction in Oracle ( Over Oracle DBLink)

To fetch the data from one server to and other Oracle server over DBLink, I experienced the following facts of Oracle Distributed transactions: Security issue: - We cannot create Public synonym for the remote object accessed over Private DBLink of other Database. - It’s allowed to create private synonym for remote object, but you cannot grant the access over this synonym to any other schema. If you try to provide the grants to other schema Oracle raises an error: [ORA-02021: DDL operations are not allowed on a remote database] “In an all you can access remote objects over private DBLink in the same schema where DBLink is created”. Fetching the Ref Cursor at Remote site: Let’s say we have two site...

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Santosh Kangane

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