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Oracle RAC Cluster Tips by Burleson Consulting

This is an excerpt from the bestselling book Oracle Grid & Real Application Clusters.  To get immediate access to the code depot of working RAC scripts, buy it directly from the publisher and save more than 30%.

At the highest level of the logical structure chain, there is the tablespace. It is a logical administrative unit and is composed of many Oracle Data Files. Within the tablespace area, the extents are created which are assigned to the segments. Structures like Tables and Index are created out of the tablespace.

The traditional tablespace is referred to as a small-file tablespace (SFT). A small-file tablespace contains multiple, relatively small files.  However with 10g release, a new concept of bigfile tablespace (BFT) was introduced. A BFT tablespace contains a single file that can have a very large size.

The big-file tablespace has the following characteristics:

* An Oracle database can contain both big file and small file tablespaces.

* System default is to create the traditional small-file tablespace.

* The SYSTEM and SYSAUX tablespaces are always created using the system default type.

* Bigfile tablespaces are supported only for locally managed tablespaces with automatic segment-space management. 

There are two exceptions when bigfile tablespace segments are managed manually:

* Locally managed undo tablespace

* Temporary tablespace

Bigfile tablespaces are intended to be used with Automated Storage Management (ASM) or other logical volume managers that support RAID.  However, they can also be used without ASM.

Bigfile Tablespace Benefits are as follows:

* It simplifies large database tablespace management by reducing the number of data files needed.

* It simplifies data file management with Oracle-managed files and Automated Storage Management (ASM) by eliminating the need for adding new data files and dealing with multiple files.

* It allows the creation of a big file tablespace of up to eight exabytes (eight million terabytes) in size, and significantly increases the storage capacity of an Oracle database.

* It follows the concept that a tablespace and a data file are logically equivalent.

* Provides the Maximum Database Size

The maximum number of data files in Oracle9i and Oracle 10g Database is 65,536.  However, the maximum number of blocks in a data file increase from 4,194,304 (4 million) blocks to 4,294,967,296 (4 billion) blocks.

The maximum amount of data for a 32K block size database is eight petabytes (8,192 Terabytes) in Oracle9i.




32 K

128 GB

8,388,608 GB

16 K

64 GB

4,194,304 GB

8 K

32 GB

2,097,152 GB

4 K

16 GB

1,048,579 GB

2 K

8 GB

524,288 GB

Table 4.2: Maximum Database Size in Oracle9i

The maximum amount of data for a 32K block size database is eight exabytes (8,388,608 Terabytes) in Oracle 10g.




32 K

131,072 GB

8,589,934,592 GB

16 K

65,536 GB

4,294,967,296 GB

8 K

32,768 GB

2,147,483,648 GB

4 K

16,384 GB

1,073,741,824 GB

2 K

8,192 GB

536,870,912 GB

Table 4.3:  Maximum Database Size in Oracle 10g

With the new BFT addressing scheme, Oracle 10g can contain astronomical amounts of data within a single database.


This is an excerpt from the bestselling book Oracle Grid & Real Application Clusters, Rampant TechPress, by Mike Ault and Madhu Tumma.

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.


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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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