Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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CHAPTER 3 ■ FILES 95 dictionary tables. However, once an extent was allocated in a temporary tablespace, the system would hold on to it (i.e., it would not give the space back). The next time someone requested space in the temporary tablespace for any purpose, Oracle would look for an already allocated extent in its internal list of allocated extents. If it found one there, it would simply reuse it, or else it would allocate one the old-fashioned way. In this manner, once the database had been up and running for a while, the temporary segment would appear full but would actually just be “allocated.” The free extents were all there; they were just being managed differently. When someone needed temporary space, Oracle would look for that space in an in-memory data structure, instead of executing expensive, recursive SQL. In Oracle 8.1.5 and later, Oracle goes a step further in reducing this space management overhead. It introduced the concept of a locally-managed tablespace as opposed to a dictionarymanaged one. Local management of space effectively did for all tablespaces what Oracle 7.3 did for temporary tablespaces: it removed the need to use the data dictionary to manage space in a tablespace. With a locally-managed tablespace, a bitmap stored in each data file is used to manage the extents. Now to get an extent, all the system needs to do is set a bit to 1 in the bitmap. To free space, the system sets a bit back to 0. Compared to using dictionarymanaged tablespaces, this is incredibly fast. We no longer serialize for a long-running operation at the database level for space requests across all tablespaces. Rather, we serialize at the tablespace level for a very fast operation. Locally-managed tablespaces have other nice attributes as well, such as the enforcement of a uniform extent size, but that is starting to get heavily into the role of the DBA. Going forward, the only storage management method you should be using is a locallymanaged tablespace. In fact, in Oracle9i and above, if you create a database using the database configuration assistant (DBCA), it will create SYSTEM as a locally-managed tablespace, and if SYSTEM is locally managed, all other tablespaces in that database will be locally managed as well, and the legacy dictionary-managed method will not work. It is not that dictionarymanaged tablespaces are not supported in a database where SYSTEM is locally managed, it is that they simply cannot be created: ops$tkyte@ORA10G> create tablespace dmt 2 datafile '/tmp/dmt.dbf' size 2m 3 extent management dictionary; create tablespace dmt * ERROR at line 1: ORA-12913: Cannot create dictionary managed tablespace ops$tkyte@ORA10G> !oerr ora 12913 12913, 00000, "Cannot create dictionary managed tablespace" // *Cause: Attempt to create dictionary managed tablespace in database // which has system tablespace as locally managed // *Action: Create a locally managed tablespace. This is a positive side effect, as it prohibits you from using the legacy storage mechanism, which was less efficient and dangerously prone to fragmentation. Locally-managed tablespaces, in addition to being more efficient in space allocation and de-allocation, also prevent tablespace fragmentation from occurring. This is a side effect of the way space is allocated and managed in locally-managed tablespaces. We’ll take an in-depth look at this in Chapter 10.
96 CHAPTER 3 ■ FILES Temp Files Temporary data files (temp files) in Oracle are a special type of data file. Oracle will use temporary files to store the intermediate results of a large sort operation and hash operations, as well as to store global temporary table data, or result set data, when there is insufficient memory to hold it all in RAM. Permanent data objects, such as a table or an index, will never be stored in a temp file, but the contents of a temporary table and its indexes would be. So, you’ll never create your application tables in a temp file, but you might store data there when you use a temporary table. Temp files are treated in a special way by Oracle. Normally, each and every change you make to an object will be recorded in the redo logs; these transaction logs can be replayed at a later date in order to “redo a transaction,” which you might do during recovery from failure, for example. Temp files are excluded from this process. Temp files never have redo generated for them, although they can have undo generated. Thus, there will be redo generated working with temporary tables since UNDO is always protected by redo, as you will see in detail in Chapter 9. The undo generated for global temporary tables is in order to support rolling back some work you have done in your session, either due to an error processing data or because of some general transaction failure. A DBA never needs to back up a temporary data file, and in fact to attempt to do so would be a waste of time, as you can never restore a temporary data file. It is recommended that your database be configured with locally-managed temporary tablespaces. You’ll want to make sure that as a DBA, you use a CREATE TEMPORARY TABLESPACE command. You do not want to just alter a permanent tablespace to a temporary one, as you do not get the benefits of temp files that way. One of the nuances of true temp files is that if the OS permits it, the temporary files will be created sparse—that is, they will not actually consume disk storage until they need to. You can see that easily in this example (on Red Hat Linux in this case): ops$tkyte@ORA10G> !df Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda2 74807888 41999488 29008368 60% / /dev/hda1 102454 14931 82233 16% /boot none 1030804 0 1030804 0% /dev/shm ops$tkyte@ORA10G> create temporary tablespace temp_huge 2 tempfile '/d01/temp/temp_huge' size 2048m 3 / Tablespace created. ops$tkyte@ORA10G> !df Filesystem 1K-blocks Used Available Use% Mounted on /dev/hda2 74807888 41999616 29008240 60% / /dev/hda1 102454 14931 82233 16% /boot none 1030804 0 1030804 0% /dev/shm
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Expert Oracle Database Architecture
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Contents Foreword . . . . . . . . .
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■CONTENTS v Block Buffer Cache .
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■CONTENTS vii ■CHAPTER 9 Redo a
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■CONTENTS ix ■CHAPTER 12 Dataty
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338 CHAPTER 10 ■ DATABASE TABLES
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