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Table of Contents ix
Change the Maximum Number of Dbspaces ....... 3-111
Change the Maximum Number of Locks ........ 3-112
Change the Maximum Number of Tblspaces....... 3-113
Change the Maximum Number of Users ........ 3-114
Change the Number of Page Cleaners ......... 3-115
Things to Avoid .................. 3-116
Chapter 4 Data Consistency, Recovery, and Migration
In This Chapter .................. 4-5
Consistency Checking ................ 4-6
Using the tbcheck Commands............ 4-6
Using the OnLine Message Log ........... 4-8
Setting Consistency-Checking Variables ........ 4-9
Recovering from Corruption ............ 4-12
Mirroring .................... 4-14
Beginning................... 4-15
Processing .................. 4-16
Recovery ................... 4-17
Ending .................... 4-17
OnLine Logging Overview .............. 4-18
Dbspace Logging ................ 4-19
Blobspace Logging................ 4-22
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
Synchronize tbtape and tbinit Activities ........ 4-33
Write Tape Header Page .............. 4-35
Archive Reserved Pages .............. 4-36
Determine Archive Criteria............. 4-37
Archive Disk Pages That Meet Criteria......... 4-38