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OMF redo log file creation is similar to control file creation. If you don t specify a location for the redo log files, and you set either the DB_CREATE_FILE_DEST or the DB_CREATE_ONLINE_LOG_DEST_n parameter in the init.ora file, Oracle automatically creates OMF-based redo log files.

Write to Temp File()

If you don t specify a datafile location in the CREATE or ALTER statements for a regular datafile, or a tempfile for a temporary tablespace, tempfile, or an undo tablespace datafile, but instead specify the DB_CREATE_FILE_DEST parameter, all these files will be OMF files.

Let s look at a small example to see how OMF files can really simplify database creation. When you create a new database, you need to provide the control file, redo log file, and datafile locations to Oracle. You specify some file locations in the initialization file (control file locations) and some file locations at database creation (such as redo log locations). However, if you use OMF-based files, database creation can be a snap, as you ll see in the sections that follow.

Rename Temp File to Shared File()

For the new OMF-based database, named nicko, let s use the following initialization parameters: db_name=nicko DB_CREATE_FILE_DEST = '/u01/app/oracle/oradata' DB_RECOVERY_FILE_DEST_SIZE = 100M DB_RECOVERY_FILE_DEST = '/u04/app/oracle/oradata' LOG_ARCHIVE_DEST_1 = 'LOCATION = USE_DB_RECOVERY_FILE_DEST' Note that of the four OMF-related initialization parameters, I chose to use only the DB_CREATE_FILE_DEST, DB_RECOVERY_FILE_DEST_SIZE, and DB_RECOVERY_FILE_DEST parameters. I didn t have to use the fourth parameter, DB_CREATE_ONLINE_LOG_DEST_n, in this example. When this parameter is left out, Oracle creates a copy of the log file and the redo log file in the locations specified for the DB_CREATE_FILE_DEST and the DB_RECOVERY_FILE_DEST parameters. I thus have two copies of the control file and the online redo log files. The setting for the last parameter, LOG_ARCHIVE_DEST_1, tells Oracle to send the archived redo logs for storage in the flash recovery area specified by the DB_RECOVERY_FILE_DEST parameter.

Using the simple init.ora file shown in the preceding section, you can start an instance as shown in Listing 6-10. Listing 6-10. Creating the OMF-Based Instance SQL> connect sys/sys_passwd as sysdba Connected to an idle instance. SQL> STARTUP NOMOUNT PFILE='initnicko.ora'; ORACLE instance started. Total System Global Area 188743680 bytes Fixed Size 1308048 bytes Variable Size 116132464 bytes Database Buffers 67108864 bytes Redo Buffers 4194304 bytes SQL>

Note Oracle strongly recommends that you just use the Oracle-created GATHER_STATS_JOB, run by the Scheduler during the scheduled maintenance window, to collect optimizer statistics. You may want to collect optimizer statistics manually under an extreme situation, such as the database not being up during the scheduled maintenance window, or if you want to analyze a newly created table right away.

Wait Until Shared File Is Present Read Shared File()

One of the trickiest and most satisfying aspects of a DBA s job is helping to improve the quality of SQL code in the application. Efficient code means fast performance, and an easy way to decrease the I/O your query requires is to try to lower the number of rows that the optimizer has to examine. The optimizer is supposed to find the optimal plan based on your query. This means the optimizer won t rewrite an inefficiently written query it only produces the execution plan for that query. Also, even if your query is efficiently written, the optimizer may not always end up producing the best execution plan. You have better knowledge of your application and data than the optimizer does, and you can, with hints, force the optimizer to use that knowledge. The following sections cover some of the best guidelines for writing good SQL.