DBAI_les09_Rev1_1.ppt - 9 Storage Structure and Relationships Copyright © Oracle Corporation 2001 All rights reserved Objectives After completing this

DBAI_les09_Rev1_1.ppt - 9 Storage Structure and...

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9 Copyright © Oracle Corporation, 2001. All rights reserved. Storage Structure and Relationships
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9-2 Copyright © Oracle Corporation, 2001. All rights reserved. Objectives After completing this lesson, you should be able to do the following: Describe the logical structure of the database List the segment types and their uses List the keywords that control block space usage Obtain information about storage structures from the data dictionary
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9-3 Copyright © Oracle Corporation, 2001. All rights reserved.
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9-4 Copyright © Oracle Corporation, 2001. All rights reserved. Storage and Relationship Structure Database PROD DISK1/SYS1.dbf DISK2/ USER1.dbf DISK3/ USER2.dbf DISK1/ ROLL1.dbf DISK1/ TEMP.dbf D.D. Table Data Seg D.D. Index Index Seg RB Seg S_DEPT Data Seg S_EMP Data Seg Temp Temp Seg 1 2 1 2 1 2 1 1 2 2 1 FREE 1 1 2 2 1 EXTENTS S_DEPT (cont'd) Data Seg S_EMP FIRST_N AME Index Index Seg Oracle DATA BLOCKS RBS1 (cont'd) RB Seg RBS2 (cont'd) RB Seg RBS1 RB Seg RBS2 RB Seg SEGMENTS SYSTEM USER_DATA RBS TEMP TABLESPACES DATAFILES
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9-5 Copyright © Oracle Corporation, 2001. All rights reserved. Types of Segments Table Cluster Table partition Index
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9-7 Copyright © Oracle Corporation, 2001. All rights reserved. Types of Segments Index-organized table Index partition Undo segment Temporary segment
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9-8 Copyright © Oracle Corporation, 2001. All rights reserved. Types of Segments LOB segment Bootstrap segment Nested table
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9-9 Copyright © Oracle Corporation, 2001. All rights reserved. Storage Clause Precedence Oracle default Tablespace Segment
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9-10 Copyright © Oracle Corporation, 2001. All rights reserved. Extent Allocation and Deallocation An extent is a chunk of space used by a segment within a tablespace.
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