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Oracle Database Undo Segment Operation Concept

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Chien Chung Shen
Chien Chung Shen

Oracle Database UNDO SEGMENT operation concept

Données & analyses
1  sur  6
Extent  1 Extent  2 Tx1 Tx2 Tx3 undo  segment  1 ext1 ext2
Extent  1 Extent  2 Tx1 Tx2 Tx3 undo  segment  1 Tx4 Tx5 Tx6 ext1 ext2
Extent  1 Extent  2 Tx1 Tx2 Tx3 undo  segment  1 Tx4 Tx5 Tx6 Tx7 ext1 ext2
Extent  1 Extent  2 Tx1 Tx2 Tx3 undo  segment  1 Tx4 Tx5 Tx6 Tx7 Extent  3 ext1 ext2 ext3 Allocate     New  Extent Extent  1  is  ACTIVE/INACTIVE  extent
Extent  1 Extent  2 Tx1 Tx2 Tx3 undo  segment  1 Tx4 Tx5 Tx6 Tx7 ext1 ext2 Extent  1  is  EXPIRED  extent
Extent  1 Extent  2 undo  segment  1 Tx5 Tx6 Tx7 ext1 ext2

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Oracle Database Undo Segment Operation Concept

  • 1. Extent  1 Extent  2 Tx1 Tx2 Tx3 undo  segment  1 ext1 ext2
  • 2. Extent  1 Extent  2 Tx1 Tx2 Tx3 undo  segment  1 Tx4 Tx5 Tx6 ext1 ext2
  • 3. Extent  1 Extent  2 Tx1 Tx2 Tx3 undo  segment  1 Tx4 Tx5 Tx6 Tx7 ext1 ext2
  • 4. Extent  1 Extent  2 Tx1 Tx2 Tx3 undo  segment  1 Tx4 Tx5 Tx6 Tx7 Extent  3 ext1 ext2 ext3 Allocate     New  Extent Extent  1  is  ACTIVE/INACTIVE  extent
  • 5. Extent  1 Extent  2 Tx1 Tx2 Tx3 undo  segment  1 Tx4 Tx5 Tx6 Tx7 ext1 ext2 Extent  1  is  EXPIRED  extent
  • 6. Extent  1 Extent  2 undo  segment  1 Tx5 Tx6 Tx7 ext1 ext2