Oracle Interview Questions And Answers

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Oracle Interview Questions And Answers Page 19 of 95 Export the user Perform import using the command imp system/manager file=export.dmp indexfile=newrite.sql. This will create all definitions into newfile.sql. Drop necessary objects. Run the script newfile.sql after altering the tablespaces. Import from the backup for the necessary objects. 19. List the Optional Flexible Architecture (OFA) of Oracle database ? or How can we organise the tablespaces in Oracle database to have maximum performance ? SYSTEM - Data dictionary tables. DATA - Standard operational tables. DATA2- Static tables used for standard operations INDEXES - Indexes for Standard operational tables. INDEXES1 - Indexes of static tables used for standard operations. TOOLS - Tools table. TOOLS1 - Indexes for tools table. RBS - Standard Operations Rollback Segments, RBS1,RBS2 - Additional/Special Rollback segments. TEMP - Temporary purpose tablespace TEMP_USER - Temporary tablespace for users. USERS - User tablespace. 20. How will you force database to use particular rollback segment ? SET TRANSACTION USE ROLLBACK SEGMENT rbs_name. 21. What is meant by free extent ? A free extent is a collection of continuous free blocks in tablespace. When a segment is dropped its extents are reallocated and are marked as free. 22. How free extents are managed in Ver 6.0 and Ver 7.0 ? Free extents cannot be merged together in Ver 6.0. Free extents are periodically coalesces with the neighboring free extent in Ver 7.0 23.Which parameter in Storage clause will reduce no. of rows per block? PCTFREE parameter Row size also reduces no of rows per block. 24. What is the significance of having storage clause ?