IBM 000-8697 Uživatelský manuál stáhnout pdf (Strana 97)

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101

System Architecture 2-3

LRU Queues and Buffer Pool Management..........2-58

LRU_MAX_DIRTY .................2-59

LRU_MIN_DIRTY .................2-59

How a User Process Acquires a Buffer ...........2-60

Step 1: Identify the Data ...............2-61

Step 2: Determine Lock-Access Level ..........2-61

Step 3: Locate the Page in Memory ...........2-61

Step 4: Read the Page in from Disk ...........2-62

Steps 5-7: Lock Buffer, Release Lock, and Wake

Waiting Processes ..............2-62

Physical Log Buffer ..................2-63

Double Buffering .................2-64

Causes of Flushing .................2-64

Flushing a Full Buffer ................2-65

Logical Log Buffer ..................2-66

Triple Buffering ..................2-66

Buffer Contents ..................2-68

Causes of Flushing .................2-68

Flushing a Full Buffer ................2-69

OnLine Checkpoints .................2-70

Main Events During a Checkpoint ...........2-70

Initiating a Checkpoint ...............2-70

Fast Recovery...................2-71

Archive Checkpoints ................2-71

What Happens During a Checkpoint ............2-72

When the Daemons Flush the Buffer Pool ..........2-73

How OnLine Synchronizes Buffer Flushing..........2-74

Write Types Describe Flushing Activity ...........2-75

Sorted Write ...................2-76

Idle Write ....................2-76

Foreground Write .................2-77

LRU Write ....................2-77

Chunk Write ...................2-77

Big-Buffer Write ..................2-78

Writing Data to a Blobspace ...............2-78

Disk Data Structures ...................2-81

OnLine Disk Space Terms and Deﬁnitions ..........2-81

Chunk .....................2-82

Page ......................2-82

Blobpage ....................2-84

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