TAILIEUCHUNG - Oracle Database 2 Day DBA 11g Release- P8

Oracle Database 2 Day DBA 11g Release- P8:Oracle Database 2 Day DBA is a database administration quick start guide that teaches you how to perform day-to-day database administrative tasks. The goal of this guide is to help you understand the concepts behind Oracle Database. It teaches you how to perform all common administrative tasks needed to keep the database operational, including how to perform basic troubleshooting and performance monitoring activities. | Managing Tables After partitions are defined certain operations become more efficient. For example for some queries the database can generate query results by accessing only a subset of partitions rather than the entire table. This technique called partition pruning can provide order-of-magnitude gains in improved performance. In addition data management operations can take place at the partition level rather than on the entire table. This results in reduced times for operations such as data loads index creation and rebuilding and backup and recovery. Each partition can be stored in its own tablespace independent of other partitions. Because different tablespaces can be on different disks this provides a table structure that can be better tuned for availability and performance. Storing partitions in different tablespaces on separate disks can also optimize available storage usage because frequently accessed data can be placed on high-performance disks and infrequently retrieved data can be placed on less expensive storage. Partitioning is useful for many types of applications that manage large volumes of data. Online transaction processing OLTP systems often benefit from improvements in manageability and availability while data warehousing systems benefit from increased performance and manageability. Compressed Tables Table Compression is suitable for both OLTP applications and data warehousing applications. Compressed tables require less disk storage and result in improved query performance due to reduced I O and buffer cache requirements. Compression is transparent to applications and incurs minimal overhead during bulk loading or regular DML operations such as INSERT UPDATE or DELETE. You can configure table compression on the Storage subpage of the Create Table page. See Also Oracle Database Administrator s Guide for design and management considerations for different table types Oracle Database Concepts and Oracle Database VLDB and Partitioning Guide for more .

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