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2
Chapter
System Architecture
In This Chapter .................... 2-7
Initialization ..................... 2-7
Initialization Commands ............... 2-8
Shared Memory Commands ............. 2-9
Disk Space Commands ............... 2-10
What Happens During Shared-Memory Initialization ..... 2-10
Shared-Memory Initialization Procedure......... 2-11
Step 1: Calculate Configuration Values ......... 2-11
Step 2: Create Shared Memory ............ 2-12
Step 3: Attach to Shared Memory ........... 2-12
Step 4: Initialize Shared Memory Structure ........ 2-12
Step 5: Wake Parent Process ............. 2-13
Steps 6 and 7: Initiate Fast Recovery and First Checkpoint . . 2-13
Step 8: Drop Temporary Tables (Optional) ........ 2-13
Step 9: Document Configuration Changes ........ 2-14
Step 10: Check for Forced Residency .......... 2-14
Step 11: Begin Looping as Master Daemon ........ 2-14
What Happens During Disk-Space Initialization ....... 2-14
Step 1: Calculate Configuration Values ......... 2-15
Step 2: Create OnLine Shared Memory ......... 2-16
Step 3: Attach to Shared Memory ........... 2-16
Step 4: Initialize Shared-Memory Structures ....... 2-16
Step 5: Initialize Disk Space ............. 2-16
Step 6: Wake Parent tbinit Process ........... 2-17
Step 7: Initiate First Checkpoint ............ 2-17
Step 8: Change to Quiescent Mode ........... 2-18
Step 9: Set Forced Residency ............. 2-18
Step 10: Loop as Master Daemon ........... 2-18
UNIX Kernel and Semaphore-Allocation Parameters ...... 2-18