Oracle Database 11 g - Online Public Access Catalog

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408 CHAPTER 9 ■ STORAGE MANAGEMENTCurrent Diskgroup being restored: DATADiskgroup DATA created!Template DATA2 created/altered!Template TEMP2 created/altered!User Alias directory +DATA/oradatacreated!User Alias directory +DATA/oradata/WWJDcreated!User Alias directory +DATA/oradata/DBATOOLScreated!■Note In the RAC node, each instance must manually mount the diskgroup after the restore is successfullyexecuted.At this point, if you examine the alert log of the ASM instance, you will see the SQL statementsthat were executed behind the scenes. Here’s an excerpt from the alert log file located inthe new diag directory, /apps/oracle/diag/rdbms/dbatools/DBATOOLS/trace/alert_+ASM1.log:SUCCESS: diskgroup DATA was mountedSQL> alter diskgroup DATA alter template AUTOBACKUP attributes (MIRROR COARSE)SQL> alter diskgroup DATA alter template DATAGUARDCONFIG attributes (MIRROR COARSE)SQL> alter diskgroup DATA alter template CONTROLFILE attributes (HIGH FINE)SQL> alter diskgroup DATA add template DATA2 attributes (MIRROR FINE)SQL> alter diskgroup DATA alter template DUMPSET attributes (MIRROR COARSE)SQL> alter diskgroup DATA alter template PARAMETERFILE attributes (MIRROR COARSE)SQL> alter diskgroup DATA alter template ARCHIVELOG attributes (MIRROR COARSE)SQL> alter diskgroup DATA alter template TEMPFILE attributes (MIRROR COARSE)SQL> alter diskgroup DATA alter template ASM_STALE attributes (HIGH COARSE)SQL> alter diskgroup DATA add template TEMP2 attributes (UNPROTECTED FINE)SQL> alter diskgroup DATA alter template CHANGETRACKING attributes (MIRROR COARSE)SQL> alter diskgroup DATA alter template BACKUPSET attributes (MIRROR COARSE)SQL> alter diskgroup DATA alter template DATAFILE attributes (MIRROR COARSE)SQL> alter diskgroup DATA alter template ONLINELOG attributes (MIRROR FINE)SQL> alter diskgroup DATA alter template FLASHBACK attributes (MIRROR FINE)SQL> alter diskgroup DATA alter template ASMVDRL attributes (MIRROR COARSE)SQL> alter diskgroup DATA alter template XTRANSPORT attributes (MIRROR COARSE)SQL> alter diskgroup DATA alter template ASMVOL attributes (MIRROR COARSE)SQL> alter diskgroup DATA add directory '+DATA/oradata'SQL> alter diskgroup DATA add directory '+DATA/oradata/WWJD'SQL> alter diskgroup DATA add directory '+DATA/oradata/DBATOOLS'Since the DATA diskgroup is restored, you are ready to perform the RMAN restore of thedatabase!
CHAPTER 9 ■ STORAGE MANAGEMENT 409Additional md_restore ExamplesHere we provide some additional examples of the md_restore command. To perform a restoreof the DATA diskgroup from the MDB backup file, use this:md_restore –t full –g DATA –f /tmp/backupfileIf you want the md_restore command to just re-create the metadata for the DATA diskgroup,you can use the following command. The assumption is that the DATA diskgroup already exists.md_restore –t nodg –g DATA –i /tmp/backupfileNow let’s look at how to create a different diskgroup name. In this example, the diskgroupname DATA is remapped to DATA2:md_restore –t newdg -o "DGNAME=DATA:DATA2" –i /tmp/backupfileThe -of option lets you specify override options in a text file. This example will apply theoverride options as specified in the dg_over.txt file and restore from the backup file:md_restore –t newdg –of /tmp/dg_override.txt –i /tmp/backupfileBad Block Recovery with ASMCMDAnother new feature of the asmcmd utility is the bad block recovery, which runs automaticallyfor normal and high redundancy disks. When bad spots occur on disks, ASM can detect thesespots and recover them by restoring the data from its mirror extent from the other failure group(s).When ASM detects an IO error from an attempted read, it will automatically try to repair thatblock or blocks from the mirrored extents and write out a relocated copy to produce a successfulread. This process occurs only for read blocks and happens automatically.For the remap command to work, the diskgroups must be in a mounted state. The purposeof the remap command is to read mirrored extents to produce good IO for the primary extent.This is supposed to happen automatically, but you can use the asmcmd repair interface if thereare reports of disk errors on the physical block. At this point, you can use the remap commandto initiate a read on that block to trigger the repair. The syntax for the remap command is as follows:remap You can use the remap command for a range of physical—not virtual—blocks on a disk. is the name of the diskgroup in which a disk needs to be repaired. isthe V$ASM_DISK.NAME of the disk that needs to be repaired. is a range of physicalblocks to repair, in this format: from-to. Here are a couple of examples of this utility. The firstcommand repairs blocks 25 to 100 for the VOL1 disk in the DATA diskgroup. The latter commandrepairs blocks 5230 to 5300 of the VOL4 disk in the FRA diskgroup.ASMCMD> remap DATA VOL1 25-100ASMCMD> remap FRA VOL4 5230-5300ASM can repair only one extent at a time. If multiple block extents need to be repaired,asmcmd must make multiple passes to repair them one at a time. The remap command assumesthat the physical block size is 512 bytes and the allocation unit size is 1MB.
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The EXPERT’s VOIce ® IN ORACLEAl
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Contents at a GlanceAbout the Autho
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■CONTENTSixSQL*Plus New Features
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■CONTENTSxiEnterprise Manager Int
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■CONTENTSxiiiCombined Capture and
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■CONTENTSxvImprovements in Redo T
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About the Authors■SAM ALAPATI is
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xxii■ACKNOWLEDGMENTSNothing I do
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xxiv■INTRODUCTIONPerformance Mana
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xxvi■INTRODUCTION• The easy add
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xxviii■INTRODUCTION• The flashb
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2 CHAPTER 1 ■ INSTALLING, UPGRADI
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100 CHAPTER 3 ■ DATABASE ADMINIST
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226 CHAPTER 5 ■ DATABASE SECURITY
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266 CHAPTER 6 ■ BACKUP AND RECOVE
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CHAPTER 7■ ■ ■Data PumpDBAs a
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CHAPTER 7 ■ DATA PUMP 315if test
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CHAPTER 7 ■ DATA PUMP 317DBA11g1
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CHAPTER 7 ■ DATA PUMP 319Encrypti
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CHAPTER 7 ■ DATA PUMP 323Remappin
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CHAPTER 7 ■ DATA PUMP 325SELECT d
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CHAPTER 7 ■ DATA PUMP 333DBMS_OUT
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338 CHAPTER 8 ■ ORACLE STREAMSLat
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CHAPTER 12■ ■ ■Data Warehousi
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566 ■INDEXadvise failure command,
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568 ■INDEXDBMS_ADDM package, 216-
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570 ■INDEXcdump diagnostic direct
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586 ■INDEXOCISessionGet( ) method
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600 ■INDEXOracle Audit Vault, 259
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