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In this parameter, n refers to the number of redo log files or control files that you want Oracle to create If you want to multiplex your online redo log files as Oracle recommends, you should set n to 2 DB_RECOVERY_FILE_DEST: This parameter defines the default location for control files, archived redo log files, RMAN backups, and flashback logs If you omit the DB_CREATE_ONLINE_LOG_DEST_n parameter, this parameter will determine the location of the online redo log files and control files The directory location you specify using this parameter is also known as the flash recovery area, which I explain it in detail in 10 In addition to the preceding three initialization parameters, the DB_RECOVERY_FILE_DEST_SIZE parameter specifies the size of your flash recovery area If you don t specify any of these initialization parameters in your init.

ora file or SPFILE, you can still use the ALTER SYSTEM command to dynamically enable the creation of OMF files, as shown in the following example: SQL> ALTER SYSTEM SET DB_CREATE_FILE_DEST = 2 '/test01/app/oracle/oradata/finance1'; System altered SQL> As long as you specify the DB_CREATE_FILE_DEST parameter, you can have Oracle create OMF files for you, and you can use both the user-managed and OMF files simultaneously without a problem..

Optimizer statistics include both object (table and index) statistics and system statistics. Without accurate system statistics, the optimizer can t come up with valid cost estimates to evaluate alternative execution plans.

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Oracle optimizes the throughput of queries by default. Optimizing throughput means using the fewest resources to process the entire SQL statement. You can also ask Oracle to optimize the response time, which usually means using the fewest resources to get the first (or first n) row(s). For batch jobs, response time for individual SQL statements is less important than the total time it takes to complete the entire operation. For interactive applications, response time is more critical.

You can use any of the following three modes for the optimizer with the CBO. The value you set for the OPTIMIZER_MODE initialization parameter is the default mode for the Oracle optimizer. The rule-based optimizer is a deprecated product, and I don t even mention it here. ALL_ROWS: This is the default optimizer mode, and it directs Oracle to use the CBO whether you have statistics on any of the tables in a query (derived by you through using the DBMS_STATS package or automatically by the Oracle database) or not, with the express goal of maximizing throughput.

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Tip In the case of all three values for the optimizing mode discussed here, I state that cost optimization is used regardless of whether there are any statistics on the objects that are being accessed in a query. What this means is that in the absence of any statistics collected with the help of the DBMS_STATS package, Oracle uses dynamic sampling techniques to collect the optimizer statistics at run time. For certain types of objects, such as external tables and remote tables, Oracle uses simple default values, instead of dynamic sampling, for the optimizer statistics. For example, Oracle uses a default value of 100 bytes for row length. Similarly, the number of rows in a table is approximated by using the number of storage blocks used by a table and the average row length. However, neither dynamic sampling nor default values give results as good as using comprehensive statistics collected using the DBMS_STATS package. Whether you collect statistics manually, or rely on Oracle s Automatic Optimizer Statistics Collection feature (which uses the DBMS_STATS package internally), optimizer statistics are collected through the DBMS_STATS package.

FIRST_ROWS_n: This optimizing mode uses cost optimization regardless of the availability of statistics. The goal is the fastest response time for the first n number of rows of output, where n can take the value of 10, 100, or 1000. FIRST_ROWS: The FIRST_ROWS mode uses cost optimization and certain heuristics (rules of thumb), regardless of whether you have statistics or not. You use this option when you want the first few rows to come out quickly so response time can be minimized. Note that the FIRST_ROWS mode is retained for backward compatibility purposes only, with the FIRST_ROWS_n mode being the latest version of this model.