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2-2
IBM Informix OnLine Database Server Administrator’s Guide
OnLine User Processes. . . . . . . . . . . . . . . . . .
2-22
How User Processes Attach to Shared Memory . . . . . . . .
2-24
Step 1: Obtain SERVERNUM . . . . . . . . . . . . .
2-24
Step 2: Calculate Shared-Memory Key Value . . . . . . .
2-25
Steps 3 and 4: Request Shared-Memory Segment and
Attach to SHMBASE . . . . . . . . . . . . .
2-25
Step 5: Attach Additional Segments
. . . . . . . . . .
2-27
User Processes and Critical Sections . . . . . . . . . . . .
2-28
OnLine User Process Status and States . . . . . . . . . . .
2-29
OnLine Database Server Process . . . . . . . . . . . . .
2-30
Orphaned Database Server Processes . . . . . . . . . . .
2-31
OnLine Daemon Processes . . . . . . . . . . . . . . . .
2-33
tbinit Daemon . . . . . . . . . . . . . . . . . . .
2-33
tbundo Daemon
. . . . . . . . . . . . . . . . . .
2-34
tbpgcl Daemon . . . . . . . . . . . . . . . . . . .
2-34
Shared Memory and Process Communication. . . . . . . . . .
2-36
Shared Memory and Buffer Locks
. . . . . . . . . . . .
2-38
Buffer Share Lock . . . . . . . . . . . . . . . . .
2-38
Buffer Update Lock . . . . . . . . . . . . . . . .
2-38
Buffer Exclusive Lock . . . . . . . . . . . . . . .
2-39
Managing Shared-Memory Resources . . . . . . . . . . .
2-39
Shared-Memory Latches . . . . . . . . . . . . . .
2-41
OnLine Timestamps . . . . . . . . . . . . . . . .
2-44
Hash Tables and the Hashing Technique . . . . . . . . .
2-46
Shared-Memory Header . . . . . . . . . . . . . . . .
2-47
Shared-Memory Internal Tables . . . . . . . . . . . . .
2-48
OnLine Buffer Table . . . . . . . . . . . . . . . .
2-48
OnLine Chunk Table. . . . . . . . . . . . . . . .
2-49
OnLine Dbspace Table . . . . . . . . . . . . . . .
2-50
OnLine Latch Table . . . . . . . . . . . . . . . .
2-51
OnLine Lock Table . . . . . . . . . . . . . . . .
2-51
OnLine Page-Cleaner Table . . . . . . . . . . . . .
2-52
OnLine Tblspace Table . . . . . . . . . . . . . . .
2-52
OnLine Transaction Table . . . . . . . . . . . . . .
2-54
OnLine User Table
. . . . . . . . . . . . . . . .
2-54
Shared-Memory Buffer Pool
. . . . . . . . . . . . . .
2-55
Regular Buffers
. . . . . . . . . . . . . . . .
.
2-56
Big Buffers . . . . . . . . . . . . . . . . . . .
2-56
OnLine LRU Queues . . . . . . . . . . . . . . . . .
2-57
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