Dba Paper

In: Computers and Technology

Submitted By toneking1989
Words 664
Pages 3
Database Management Gerry Waldrop/CIS 444
May 21, 2012

Abstract
This document will answer the following questions about ASM management, database segments, relationships, problems associated with Row Chaining and Migration, and threshold values. Also, included will be screenshots of the extent map in OEM and Segment Advisor Information. Lastly, SQL statements will be executed to enable row management, shrink space, and resumable space allocation.

1. Automatic Storage Management (ASM) provides vertical integration of the file system on the database and the volume manager, which is specifically built for the database files. ASM can also provide management for single SMP machines, or access multiple nodes of a cluster for Oracle Real Application Clusters (RAC) support. There are many benefits to leaving this to OEM to manage your storage. They are the following * Integrated mirroring * Data is automatically load balanced * Database files are managed without human interaction

2. Database segments are managed in a few different ways, one way is with LMT. LMT is implemented by adding the extent management local clause to the tablespace definition syntax. Oracle has the ability to move information out of the data dictionary tablespace and stores it directly within the tablespace itself. In s dictionary managed tablespace DMT, the data dictionary stores the free space details. While the free blocks list is managed in the segment of each table that is inside the tablespace.

3. ASM manages segments by providing file layout information to the database instance. This is so because an ASM instance is built on the same technology as a database instance. ASM disk group manages the metadata and provides space allocation for the ASM files that are stored.

4. Oracle allocates logical database space for all data in a database. The units…...

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