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| Slide 1:
Alex Kodat
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| Slide 2:
Model 204 Records
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| Slide 3:
Ways Model 204 Groups Records
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| Slide 4:
Bitmaps and Segments
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| Slide 5:
Bitmaps and Segments
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| Slide 6:
The Record Locking Table
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| Slide 7:
The Record Locking Table
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| Slide 8:
Record Locking Table - System Header
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| Slide 9:
Record Locking Table - File Headers
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| Slide 10:
Record Locking Table - RETD's
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| Slide 11:
Record Locking Table - RSXD's
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| Slide 12:
Record Locking Table - RSXD Allocation
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| Slide 13:
Record Locking Table Compaction
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| Slide 14:
Record Locking Table RSXD Allocation After Compaction
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| Slide 15:
Record Locking Table Compaction
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| Slide 16:
Record Locking Table RETD and RSXD allocation
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| Slide 17:
Record Locking Table RETD and RSXD allocation
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| Slide 18:
Record Locking Table RETD and RSXD allocation
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| Slide 19:
Record Locking Table RETD and RSXD allocation
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| Slide 20:
Record Locking Table Bitmap Page Allocation
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| Slide 21:
Record Locks - What are they ?
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| Slide 22:
How Records are Locked
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| Slide 23:
How Records are Locked
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| Slide 24:
How Records are Locked
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| Slide 25:
The Pending Update Chain
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| Slide 26:
The Pending Update Chain
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| Slide 27:
The Pending Update Chain
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| Slide 28:
The Pending Update Chain Does it make sense as bitmap ?
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| Slide 29:
Record Locking Conflicts
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| Slide 30:
Record Locking Conflicts
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| Slide 31:
Protecting Record Lockers The Problem
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| Slide 32:
Protecting Record Lockers The Solution
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| Slide 33:
Protecting Record Lockers The Solution
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| Slide 34:
The RECENQ Critical File Resource
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| Slide 35:
Why Record Locks are Useful
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| Slide 36:
Why Record Locks are Useful
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| Slide 37:
Model 204 Feature
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| Slide 38:
Reasons for Accessing Unlocked Records
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| Slide 39:
Reasons for Accessing Unlocked Records
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| Slide 40:
Reasons for Accessing Unlocked Records
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| Slide 41:
Minimizing Impact of Batch/Adhocs Technique 1
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| Slide 42:
Minimizing Impact of Batch/Adhocs Technique 1
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| Slide 43:
Minimizing Impact of Batch/Adhocs Technique 2
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| Slide 44:
Minimizing Impact of Batch/Adhocs Technique 2
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| Slide 45:
Deadly Embrace Example
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| Slide 46:
Deadly Embrace Example Solution 1
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| Slide 47:
Deadly Embrace Example Solution 2
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| Slide 48:
Application Level Locks
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| Slide 49:
Using FDR and FD for an Application Level Lock
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| Slide 50:
Using FDR and FD for an Application Level Lock
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| Slide 51:
Using FDR and FD for an Application Level Lock
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| Slide 52:
Using FDR and FD for an Application Level Lock - Example (From Sirius
Customer
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| Slide 53:
Record Locking Conclusions
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| Slide 54:
Record Locking Conclusions
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| Slide 55:
Record Locking Conclusions
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| Slide 56:
Questions, comments ?
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