What is tablespace management in Oracle?
What is tablespace management in Oracle?
In a locally managed tablespace, there are two methods that Oracle Database can use to manage segment space: automatic and manual. Manual segment space management uses linked lists called “freelists” to manage free space in the segment, while automatic segment space management uses bitmaps.
What is a tablespace in Oracle 11g?
An Oracle database consists of one or more logical storage units called tablespaces, which collectively store all of the database’s data. Each tablespace in an Oracle database consists of one or more files called datafiles, which are physical structures that conform to the operating system in which Oracle is running.
What is the major advantage of specifying a temporary tablespace for a user?
The correct answer is B. Most importantly, specifying a temporary tablespace for a user prevents sorts from being done in the SYSTEM tablespace.
What is the purpose of set transaction statement?
The SET TRANSACTION statement begins a read-only or read-write transaction, establishes an isolation level, or assigns the current transaction to a specified rollback segment. Read-only transactions are useful for running multiple queries against one or more tables while other users update the same tables.
How do I create a new tablespace?
Introduction to the CREATE TABLESPACE statement
- First, specify the name of the tablespace after the CREATE TABLESPACE keywords. In this example, the tablespace name is tbs1 .
- Second, specify the path to the data file of the tablespace in the DATAFILE clause.
- Third, specify the size of the tablespace in the SIZE clause.
What are the guidelines for working with tablespaces of Oracle Database?
Before working with tablespaces of an Oracle Database, familiarize yourself with the guidelines provided in the following sections: Using multiple tablespaces allows you more flexibility in performing database operations. When a database has multiple tablespaces, you can: Separate user data from data dictionary data to reduce I/O contention.
What is the default compatible setting for Oracle Database 11g Release 2?
The default setting for COMPATIBLE for a new Oracle Database 11 g Release 2 installation is 11.2.0. Any user who can create a tablespace can create an encrypted tablespace.
What is a temporary tablespace in Oracle?
A temporary tablespace contains transient data that persists only for the duration of the session. Temporary tablespaces can improve the concurrency of multiple sort operations, reduce their overhead, and avoid Oracle Database space management operations.
What are the benefits of locally managed tablespaces?
Locally managed tablespaces track all extent information in the tablespace itself by using bitmaps, resulting in the following benefits: Fast, concurrent space operations. Space allocations and deallocations modify locally managed resources (bitmaps stored in header files).