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Traditionally, organizations have spent considerable amounts of effort on laborious performancetuning exercises. Oracle Database 11g provides you with powerful and accurate automatic performance-tuning capabilities. The heart of this functionality is the new statistics collection facility, the Automatic Workload Repository (AWR), which automatically collects and saves crucial performance statistics (including those for SQL statements that use the most resources in the database) to help detect performance problems and self-tune the database. AWR saves its data in the Sysaux tablespace. I explain the AWR in detail in 18. Instead of running myriad SQL performance-tuning scripts, just go to the Automatic Database Diagnostic Monitor (ADDM, pronounced adam ) as the first source for all your performance troubleshooting work. You ll save a lot of time that you might otherwise spend looking at extraneous issues that really don t have a bearing on performance. Since the ADDM ranks both the problems and its

You use the TEMPFILE clause, not the DATAFILE clause, when you allocate space to a temporary tablespace.

It s common to create a single temporary tablespace (usually named Temp) for each database, but you can have multiple temporary tablespaces, which are part of a temporary tablespace group, if your database needs them to support heavy sorting operations. In order to drop a default temporary tablespace, you must first use the ALTER TABLESPACE command to create a new default tablespace for the database. You can then drop the previous default temporary tablespace like any other tablespace.

The easiest way to describe algorithmic logic coupling (ALC) is with an example. Let T1 and T2 be two classes. T1 uses an algorithm F to encrypt data, which is then sent to T2. If T2 needs to decrypt the data, it needs a decryption algorithm that I ll call G. It is obvious that the algorithm G is dependent on the algorithm F. If T1 changes the way it encrypts the data, then T2 also needs to change the way it decrypts the data. Class T2 is said to have algorithmic logic coupling, or simply algorithmic coupling, to T1, as shown in Figure 1-9.

Oracle recommends that you use a locally managed temporary tablespace with a 1MB uniform extent size as your default temporary tablespace.

You can issue the ALTER TEMPORARY TABLESPACE statement to perform various temporary tablespace management tasks, including adding a tempfile to grow a temporary tablespace. Here s an example showing how you can make the temporary tablespace larger: SQL> ALTER TABLESPACE temp ADD TEMPFILE '/u01/app/oracle/tempfile/tempo3.dbf' size 1000M reuse; You can similarly use the following ALTER TABLESPACE command to resize a tempfile: SQL> ALTER DATABASE TEMPFILE '/u01/app/oracle/tempfile/temp03.dbf' RESIZE 200M; And you can use the following statement to drop a tempfile and remove the operating system file: SQL> ALTER DATABASE TEMPFILE '/u01/app/oracle/tempfile/temp03.dbf' DROP INCLUDING DATAFILES; When you drop a tempfile belonging to a temporary tablespace, the tablespace itself will remain in use. You can shrink a temporary tablespace, just as you can a normal tablespace. The following example shows how to issue the ALTER TABLESPACE statement to shrink a temporary tablespace: SQL> ALTER TABLESPACE temp SHRINK SPACE KEEP 500m;

You may have to increase the size of a temporary tablespace to accommodate an unusually large job that makes use of the temporary tablespace. After the completion of the job, you can shrink the temporary tablespace using the clause SHRINK SPACE in an ALTER TABLESPACE statement. Here s an example: SQL> ALTER TABLESPACE temp SHRINK SPACE; Tablespace altered. SQL> The SHRINK SPACE clause will shrink all tempfiles to a minimum size, which is about 1MB. You can employ the KEEP clause to specify a minimum size for the tempfiles, as shown here: SQL> ALTER tablespace temp SHRINK SPACE KEEP 250m; Oracle uses a peculiar logic when shrinking tempfiles in a temporary tablespace. Let s say you have a temporary tablespace that contains two 1GB tempfiles. You issue a command to shrink the tablespace to 1GB, a shown here: SQL> ALTER TABLESPACE temp SHRINK SPACE KEEP 1000M; Tablespace altered. SQL> If you query the V$TEMPFILE view, you ll see this:

Figure 1-9. Algorithmic logic coupling between T1 and T2 As you can see in the diagram, the symbol is subscripted with the letters La to denote ALC. The coupling arrow in the figure is double-headed to indicate that T1 and T2 are mutually coupled. One class doesn t depend on the other; both classes depend on each other. If you change the coupled algorithms in either class, you must change the algorithm in the other class as well (if you want the system to work correctly). Encryption and decryption algorithms are special cases of a broader set of algorithms called complementary algorithms. I need to make a small digression at this point to describe the properties of complementary algorithms and other types of algorithms involved in algorithmic logic coupling.

SQL> SELECT file#, name, bytes/1024/1024 mb FROM v$tempfile; FILE# ----1 2 NAME -----------------------------------/u01/app/oracle/tempfile/temp01.dbf /u01/app/oracle/tempfile/temp02.dbf' MB --------999.9375 1.0625