Caché High Availability Guide - InterSystems Documentation

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1Write Image Journaling andRecoveryCaché uses write image journaling to maintain the internal integrity of your Caché database.It is the foundation of the database recovery process.This chapter discusses the following topics:• Write Image Journaling• Recovery• Error Conditions• Limitations1.1 Write Image JournalingCaché safeguards database updates by using a two-phase technique, write image journaling,in which updates are first written from memory to a transitional journal, CACHE.WIJ, andthen to the database. If the system crashes during the second phase, the updates can be reappliedupon recovery. The following topics are covered in greater detail:• Image Journal• Two-Phase Write ProtocolCaché High Availability Guide 3
Page 3 and 4: Table of ContentsIntroduction .....
Page 5 and 6: 3.3.5 Purge Journal Files .........
Page 7 and 8: 7.7 Startup Recovery Routine ......
Page 9: List of TablesConditions Affecting
Page 14 and 15: Write Image Journaling and Recovery
Page 26 and 27: Backup and Restore2.1 Backup Integr
Page 28 and 29: Backup and Restoreconfigured so tha
Page 30 and 31: Backup and Restore2.3.1.1 Concurren
Page 32 and 33: Backup and Restorepass, the system
Page 34 and 35: Backup and Restore• Configure Bac
Page 36 and 37: Backup and RestoreBackup files and
Page 38 and 39: Backup and RestoreWhile running a b
Page 40 and 41: Backup and Restore2.6 Restoring fro
Page 42 and 43: Backup and Restore2.6.4 Performing
Page 44 and 45: Backup and RestoreThis backup volum
Page 46 and 47: Backup and RestoreWe know something
Page 48 and 49: Backup and RestoreFor each database
Page 50 and 51: Backup and RestoreSuspend Updates?
Page 52 and 53: Backup and Restore%SYS>Do ^BACKUP1)
Page 54 and 55: Backup and Restore:# InterSystems C
Page 56 and 57: Backup and Restoregreater redundanc
Page 58 and 59: Backup and Restorethe application p
Page 61 and 62: 3JournalingGlobal journaling preser
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3.1.1 Differences Between Journalin
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If you need to exclude new z/Z* glo
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Configuring JournalingThis includes
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Journaling Operation Tasks3.3.3 Swi
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Journaling Utilities3.4 Journaling
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If journaling is not running when y
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Journaling UtilitiesZJRNFILT(pid,di
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Journaling Utilities1. Begin Journa
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The following is a sample journal f
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Journaling Utilities3.4.7.1 Select
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Journaling UtilitiesSYS>Do ^JRNOPTS
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Journaling UtilitiesJournal recover
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Journaling UtilitiesCAUTION:Only us
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Journaling Utilitiesc:\configs\cach
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Special Considerations for Journali
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What should you do after journaling
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Shadow Journalingof the actual Set,
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Shadow JournalingEnable the Shadowi
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Shadow Journalingdatabase mappings
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Shadow JournalingFor this example,
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Shadow Journaling4.2.3 Journaling o
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Shadow Journaling• From the Confi
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Shadow Journaling• The shadow ser
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System Failover StrategiesIt is imp
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System Failover StrategiesCold Fail
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System Failover Strategies5.4 Hot F
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6Cluster ManagementThis chapter con
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Overview of ClustersImportant:Cach
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Managing Cluster Databases6.3 Manag
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Write Image Journaling and Clusters
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6.7.1 Determining Database File Ava
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Caché ObjectScript Language Featur
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7Cluster JournalingThis chapter con
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of all the members of a cluster, es
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loss (typically less than the last
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In more complicated scenarios, thes
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Cluster ShadowingCluster Shadowing
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cannot override a redirection by sp
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this change affects only journal fi
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Cluster Journal Restore3. Perform a
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Cluster Journal Restore - Setup - M
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characters that match the partial n
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• If the current system is associ
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Cluster Journal Restore134120,_$1$D
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Cluster Journal RestoreNote:If you
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Startup Recovery RoutineBesides a l
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1) Display the list of errors from
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^%SYS("JRNINFO",1032803946,"jrninfo
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Shadow Information Global and Utili
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"intv")=10"ip")=192.9.202.5^SYS("sh
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Caché Clusters on Tru64 UNIX8.1 Tr
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Caché Clusters on Tru64 UNIXWhen a
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Caché Clusters on Tru64 UNIXTo cha
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Caché Clusters on Tru64 UNIXdlm:rh
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Caché and Windows ClustersThese cl
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Caché and Windows ClustersYou can
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Caché and Windows Clusters9.2.2 Cr
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Caché and Windows Clusters9.2.3 Cr
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Caché and Windows ClustersOnce fin
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Caché and Windows Clusters9.2.5.1
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Caché and Windows ClustersVerify t
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10ECP FailoverOne of the most power
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ECP and Clusters10.2 ECP and Cluste
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ECP and Clusters10.2.3 Network Is I
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Caché High Availability Guide - InterSystems Documentation

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