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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.

Very few transactions in an OLTP database issue the same query multiple times, so phantom reads and nonrepeatable reads are rare Serializable modes of concurrency are more appropriate for databases with mostly read-only transactions that run for a long time..

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>

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A high number of recursive SQL statements may also indicate that Oracle is busy with space management activities, such as allocating extents. This has a detrimental effect on performance. You can avoid this problem by increasing the extent sizes for your database objects. This is another good reason to choose locally managed tablespaces, which cut down on the number of recursive SQL statements.

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.

Operating system physical memory holds all the data and programs by loading them from disk. System CPU executes programs only if they re loaded into the physical memory. If excessive memory usage occurs, the operating system will use virtual memory, which is storage space on secondary storage media such as disks, to hold temporarily some of the data and/or programs being used. The space for the virtual memory is called swap space. When the system needs room in the physical or main memory, it swaps out some programs to the swap area, thus freeing up additional physical memory for an executing program. The operating system swaps out data in units called pages, which are the smallest units of memory that can be used in transferring memory back and forth between physical memory and the swap area. When the operating system needs a page that has been swapped out to the swap area, a page fault is said to occur. Page faults are commonly referred to as simply paging, and involve the transfer of data from virtual memory back to the physical memory. An excessive amount of paging results in degradation of operating system performance, and thus affects Oracle instance performance as well. One of the best ways to check operating system memory performance is by using the vmstat utility, which was explained in 3.

# Use the local clock (the impersonator or the local "master") #if the timeservers become unavailable server 12712710 fudge 12712710 stratum 10 #Restrict run-time modifications, peering, queries, #and trap service from IPs beginning with 127 # ie, all possible reference clocks restrict 127000 mask 255000 nomodify nopeer noquery notrap #Define the location for a drift file Make sure the location permits write access driftfile /etc/ntpdrift The restrict command facilitates access control to this host Even though this host synchronizes with multiple servers (identified via the XXXXXXXXXXXX, YYYYYYYYYYYY, ZZZZZZZZZZZZ IP addresses), it also restricts those servers with respect to the NTP services and/or operations they can perform on and/or with it.

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