IBM 000-8697 Manuale Utente

IBM

2

Chapter

System Architecture

In This Chapter . . . . . . . . . . . . . . . . . . . .

Initialization . . . . . . . . . . . . . . . . . . . . .

Initialization Commands

. . . . . . . . . . . . . . .

Shared Memory Commands . . . . . . . . . . . . .

Disk Space Commands . . . . . . . . . . . . . . .

What Happens During Shared-Memory Initialization

Shared-Memory Initialization Procedure. . . . . . . . .

Step 1: Calculate Configuration Values . . . . . . . . .

Step 2: Create Shared Memory . . . . . . . . . . . .

Step 3: Attach to Shared Memory . . . . . . . . . . .

Step 4: Initialize Shared Memory Structure . . . . . . . .

Step 5: Wake Parent Process . . . . . . . . . . . . .

Steps 6 and 7: Initiate Fast Recovery and First Checkpoint

Step 8: Drop Temporary Tables (Optional) . . . . . . . .

Step 9: Document Configuration Changes . . . . . . . .

Step 10: Check for Forced Residency . . . . . . . . . .

Step 11: Begin Looping as Master Daemon . . . . . . . .

What Happens During Disk-Space Initialization . . . . . . .

Step 1: Calculate Configuration Values . . . . . . . . .

Step 2: Create OnLine Shared Memory . . . . . . . . .

Step 3: Attach to Shared Memory . . . . . . . . . . .

Step 4: Initialize Shared-Memory Structures

Step 5: Initialize Disk Space . . . . . . . . . . . . .

Step 6: Wake Parent tbinit Process . . . . . . . . . . .

Step 7: Initiate First Checkpoint . . . . . . . . . . . .

Step 8: Change to Quiescent Mode . . . . . . . . . . .

Step 9: Set Forced Residency . . . . . . . . . . . . .

Step 10: Loop as Master Daemon . . . . . . . . . . .

UNIX Kernel and Semaphore-Allocation Parameters . . . . . .