IBM 000-8697 用户手册

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4-2

IBM Informix OnLine Database Server Administrator’s Guide

What Happens During Logical Log Backup . . . . . . . . . .

Ready LTAPEDEV . . . . . . . . . . . . . . . . . .

Locate the Next Logical Log

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Place Log Header on Tape . . . . . . . . . . . . . . .

Write Log Records to Tape . . . . . . . . . . . . . . .

Write Trailer Page . . . . . . . . . . . . . . . . . .

What Happens During an Archive

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Read Archive History Information . . . . . . . . . . . .

Mount a Tape on TAPEDEV

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Verify the Archive Level . . . . . . . . . . . . . . . .

Check Free Space in the Logical Log. . . . . . . . . . . .

Force a Checkpoint

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Purpose of Checkpoint Timestamp . . . . . . . . . . .

Purpose of Data Snapshot . . . . . . . . . . . . . .

Synchronize tbtape and tbinit Activities . . . . . . . . . .

Archive Disk Pages . . . . . . . . . . . . . . . .

Archive blobpages

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Write Tape Header Page . . . . . . . . . . . . . . . .

Archive Reserved Pages . . . . . . . . . . . . . . . .

Determine Archive Criteria . . . . . . . . . . . . . . .

Archive Disk Pages That Meet Criteria . . . . . . . . . . .

Monitor and Archive Physical Log Pages . . . . . . . . . .

Write a Trailer Page

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Update the Reserved Pages . . . . . . . . . . . . . . .

Fast Recovery . . . . . . . . . . . . . . . . . . . . .

How Does OnLine Initiate Fast Recovery?

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Fast Recovery and Logging . . . . . . . . . . . . . . .

Step 1: Checkpoint Condition . . . . . . . . . . . . . .

Step 2: Find Checkpoint Record in Logical Log . . . . . . . .

Step 3: Roll Forward Log Records

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Step 4: Roll Back Incomplete Transactions . . . . . . . . . .

Data Restore: When Should You Do It? . . . . . . . . . . . .

Steps That Occur During a Data Restore . . . . . . . . . .

Gather All Tapes Needed for Restore . . . . . . . . . . .

Verify OnLine Configuration . . . . . . . . . . . . . .