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Oracle Flashback

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Oracle Flashback Technology is a group of Oracle Database features that let you view past states of database objects or to return database objects to a previous state without using point-in-time media recovery. Flashback feature was introduced in Oracle9i; it was limited to Flashback Query only Great improvements have been made in the Flashback functions in Oracle Database 10g. Flashback functionalities provide fast and flexible data recovery TYPES OF FLASHBACK :- 1.      flashback query          ---we can show  only the  past state of the table 2.      flashback version query    ---show the the table transaction  time  and  scn 3.      flashback transaction query  ---it show what operation is  done and which user is performed 4.      flashback table    --- to flash back a table to an earlier  scn  or  timestamp 5.      flashback drop     ---   flashback table to before drop using  recylebin 6.      flashback database  --- to flash back a table to an earlier  scn
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How to find the server is whether standby (slave) or primary(master) in Postgresql replication ?

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How to Get Table Size, Database Size, Indexes Size, schema Size, Tablespace Size, column Size in PostgreSQL Database

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How to Return a Result Set from a PostgreSQL Stored Procedure

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Both stored procedures and user-defined functions are created with CREATE FUNCTION statement in PostgreSQL. To return one or more result sets (cursors in terms of PostgreSQL), you have to use  refcursor  return type. Quick Example : -- Procedure that returns a single result set (cursor) CREATE OR REPLACE FUNCTION show_cities ( ) RETURNS refcursor AS $$ DECLARE ref refcursor; -- Declare a cursor variable BEGIN OPEN ref FOR SELECT city , state FROM cities; -- Open a cursor RETURN ref; -- Return the cursor to the caller END ; $$ LANGUAGE plpgsql; Overview : Return Multiple Result Sets Cursor Lifetime Until the  end  of transaction Auto-commit Must be  off Transaction must be active so the caller can see a result set Important Note : The cursor remains open until the end of transaction, and since PostgreSQL works
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7 Steps to configure BDR replication in postgresql

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