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IBM
000-8697
Benutzerhandbuch
IBM 000-8697 Benutzerhandbuch
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4-2
IBM Informix OnLine Database Server Administrator’s Guide
What Happens During Logical Log Backup . . . . . . . . . .
4-26
Ready LTAPEDEV . . . . . . . . . . . . . . . . . .
4-27
Locate the Next Logical Log
. . . . . . . . . . . . . .
4-27
Copy Blobpages
. . . . . . . . . . . . . . . . . .
4-27
Place Log Header on Tape . . . . . . . . . . . . . . .
4-28
Write Log Records to Tape . . . . . . . . . . . . . . .
4-29
Write Trailer Page . . . . . . . . . . . . . . . . . .
4-30
What Happens During an Archive
. . . . . . . . . . . . .
4-30
Read Archive History Information . . . . . . . . . . . .
4-31
Mount a Tape on TAPEDEV
. . . . . . . . . . . . . .
4-31
Verify the Archive Level . . . . . . . . . . . . . . . .
4-32
Check Free Space in the Logical Log. . . . . . . . . . . .
4-32
Force a Checkpoint
. . . . . . . . . . . . . . . . .
4-32
Purpose of Checkpoint Timestamp . . . . . . . . . . .
4-33
Purpose of Data Snapshot . . . . . . . . . . . . . .
4-33
Synchronize tbtape and tbinit Activities . . . . . . . . . .
4-33
Archive Disk Pages . . . . . . . . . . . . . . . .
4-34
Archive blobpages
. . . . . . . . . . . . . . . .
4-35
Write Tape Header Page . . . . . . . . . . . . . . . .
4-35
Archive Reserved Pages . . . . . . . . . . . . . . . .
4-36
Determine Archive Criteria . . . . . . . . . . . . . . .
4-37
Archive Disk Pages That Meet Criteria . . . . . . . . . . .
4-38
Monitor and Archive Physical Log Pages . . . . . . . . . .
4-38
Write a Trailer Page
. . . . . . . . . . . . . . . . .
4-38
Update the Reserved Pages . . . . . . . . . . . . . . .
4-38
Fast Recovery . . . . . . . . . . . . . . . . . . . . .
4-39
How Does OnLine Initiate Fast Recovery?
. . . . . . . . .
4-39
Fast Recovery and Logging . . . . . . . . . . . . . . .
4-40
Step 1: Checkpoint Condition . . . . . . . . . . . . . .
4-41
Step 2: Find Checkpoint Record in Logical Log . . . . . . . .
4-41
Step 3: Roll Forward Log Records
. . . . . . . . . . . .
4-43
Step 4: Roll Back Incomplete Transactions . . . . . . . . . .
4-44
Data Restore: When Should You Do It? . . . . . . . . . . . .
4-45
Steps That Occur During a Data Restore . . . . . . . . .
.
4-45
Gather All Tapes Needed for Restore . . . . . . . . . . .
4-47
Verify OnLine Configuration . . . . . . . . . . . . . .
4-48
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