TAILIEUCHUNG - ORACLE8i- P28

ORACLE8i- P28: We want information information.” Possibly you recognize these words as the primary interest of a somewhat clandestine group, and as told by a character called Number 2 to Patrick McGoohan’s character Number 6 (in the old TV show The Prisoner). Indeed, in this day, information is king, and the speedy, accurate, and reliable retrieval of this information is paramount. | 1082 CHAPTER 26 HIGH AVAILABILITY Configuring the Primary Instance To implement managed recovery you will need to configure the primary instance to archive redo logs to the standby host. If you plan to use manual recovery you do not need to make any configuration changes to the primary instance. To configure the primary instance to archive redo logs to the standby host you will need to set up the file for the primary instance with information about where to archive these logs. You do not need to shut down the primary instance to enable these parameters. Instead you can manually enable them using the ALTER SYSTEM command as described in the Enabling Parameters for the Primary Instance section later in this chapter. The archive destination is specified by using the LOG_ARCHIVE_DEST_n parameter where n is an integer from 1 to 5. Up to five destinations may be defined but one destination must be a local device. When setting these parameters the keyword LOCATION specifies a valid path for the local archive destination and the keyword SERVICE specifies a service name referenced in the file. The SERVICE keyword must be specified for all standby archive destinations whether local or remote. Here is an example of using the LOG_ARCHIVE_DEST_n parameters in the file of the primary instance log_archive_dest_1 location u02 arch PRMRY log_archive_dest_2 service stdby There are several options that you can set with the LOG_ARCHIVE_DEST_n parameter as described in the following sections. Setting a Mandatory or Optional Destination You can specify whether a destination is mandatory or optional by using the MANDATORY or OPTIONAL keyword respectively. Oracle recommends that you specify the local archived redo log destination as MANDATORY. The following is an example of using the MANDATORY and OPTIONAL keywords log_archive_dest_1 location u02 arch PRMRY MANDATORY log_archive_dest_2 service stdby OPTIONAL Specifying Access after a Failed Write By default

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