Free Ebooks Download
Mba Ebooks
By Edhole
Mba ebooks
Free ebooks download
http://ebooks.edhole.com
DBMS Physical Design
Physical design is
concerned with the
placement of data and
selection of access
methods for efficienc...
File Organization
Physical arrangement of the records of a file on
secondary storage devices
•Sequential
•Linked List
•Ind...
Sequential File
addr
00 Ayers ACCT
01 Buckley MGT
02 Daley ACCT
03 Dejoie MGT
04 Kenderdine MKT
05 Linn FIN
06 Lusch MKT
0...
Sequential File Processing
Transaction
Old Master
New MasterProcess
Sequential files must be recopied from the point of
an...
Linked List
addr pointer
00 Price MGT 01
01 Schwarzkopf MGT 02
02 Kenderdine MKT 03
03 Lusch MKT 08
04 Buckley MGT 09
05 A...
Linked List File Processing
The next record in a linked list is found at the address
stored in the record. Records are add...
Indexed File
(sequential index)
addr
00 Price MGT Ayers ACCT
01 Schwarzkopf MGT Daley ACCT
02 Kenderdine MKT Linn FIN
03 L...
Indexed File Processing
Index
Data File
When a record is inserted or deleted in a file the data
can be added at any locati...
Segmented Index
addr
00 Price MGT Ayers ACCT
01 Schwarzkopf MGT Daley ACCT
02 Kenderdine MKT Linn FIN
03 Lusch MKT Razook ...
Indexed File Processing
(segmented index)
Data File
Index
Data can be inserted or deleted at any location in the
data file...
Physical Design
Volume and Usage analysis
Distribution Strategy
File Organizations
Indexes and Access Methods
Integrity Co...
Physical Design Issues
Size
Speed of access
Speed of update
Growth issues: performance and
degradation
Security
Maintenanc...
DBMS Organization
Relationships: physical
address pointers
Links generated when data is
entered
Efficient but not flexible...
DBMS Technology
• CPU
• Components
• Operation
• DASD
• Technology
• Organization
• Data Transfer
• Access methods
http://...
Physical Design
Data Distribution
Centralized
Partitioned
Horizontal
Vertical
Replicated
Hybrid
http://ebooks.edhole.com
Free Ebooks Download
Mba Ebooks
By Edhole
Mba ebooks
Free ebooks download
http://ebooks.edhole.com
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Mba Ebooks ! Edhole

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Mba Ebooks ! Edhole

  1. 1. Free Ebooks Download Mba Ebooks By Edhole Mba ebooks Free ebooks download http://ebooks.edhole.com
  2. 2. DBMS Physical Design Physical design is concerned with the placement of data and selection of access methods for efficiency and ongoing maintenance http://ebooks.edhole.com
  3. 3. File Organization Physical arrangement of the records of a file on secondary storage devices •Sequential •Linked List •Indexed •Hashed http://ebooks.edhole.com
  4. 4. Sequential File addr 00 Ayers ACCT 01 Buckley MGT 02 Daley ACCT 03 Dejoie MGT 04 Kenderdine MKT 05 Linn FIN 06 Lusch MKT 07 Price MGT 08 Razook MKT 09 Schwarzkopf MGT Sequential file sorted in alphabetical order. Sequential files are usually sorted in ID sequence order to facilitate batch processing. http://ebooks.edhole.com
  5. 5. Sequential File Processing Transaction Old Master New MasterProcess Sequential files must be recopied from the point of any insertion or deletion to the end of the file. They are commonly used in batch processing where a new master file will be generated each time the file is updated. http://ebooks.edhole.com
  6. 6. Linked List addr pointer 00 Price MGT 01 01 Schwarzkopf MGT 02 02 Kenderdine MKT 03 03 Lusch MKT 08 04 Buckley MGT 09 05 Ayers ACCT 06 06 Daley ACCT 07 07 Linn FIN 04 08 Razook MKT ## 09 Dejoie MGT 00 Linked list to sort data alphabetically within department. An external reference must point to the start record (05). http://ebooks.edhole.com
  7. 7. Linked List File Processing The next record in a linked list is found at the address stored in the record. Records are added at any location in the DASD and pointers adjusted to include them. Deletions are not erased, but pointers changed to omit the deleted record.http://ebooks.edhole.com
  8. 8. Indexed File (sequential index) addr 00 Price MGT Ayers ACCT 01 Schwarzkopf MGT Daley ACCT 02 Kenderdine MKT Linn FIN 03 Lusch MKT Razook MKT 04 Buckley MGT Dejoie MGT ACCT 00 ACCT 01 FIN 02 MGT 00 MGT 01 MGT 04 MKT 03 Index to access data by department abbreviation. http://ebooks.edhole.com
  9. 9. Indexed File Processing Index Data File When a record is inserted or deleted in a file the data can be added at any location in the data file. Each index must also be updated to reflect the change. For a simple sequential index this may mean rewriting the index for each insertion. Index http://ebooks.edhole.com
  10. 10. Segmented Index addr 00 Price MGT Ayers ACCT 01 Schwarzkopf MGT Daley ACCT 02 Kenderdine MKT Linn FIN 03 Lusch MKT Razook MKT 04 Buckley MGT Dejoie MGT 05 Van Horn MGT addr pointer pointer pointer 100 101 Kenderdine 102 Razook 103 101 200 Buckley 201 Dejoie 204 102 203 Lusch 202 103 205 Schwarzkopf 206 200 00 Ayers 04 Buckley 201 201 01 Daley 04 Dejoie 204 202 00 Price 03 Razook 205 203 02 Linn 03 Lusch 202 204 02 Kenderdine 203 205 01 Schwarzkopf 206 206 5 Van Horn Index Data Leaf Root Nodes http://ebooks.edhole.com
  11. 11. Indexed File Processing (segmented index) Data File Index Data can be inserted or deleted at any location in the data file. The index(es) must be updated for each change, but only the affected segments need to be rewritten. http://ebooks.edhole.com
  12. 12. Physical Design Volume and Usage analysis Distribution Strategy File Organizations Indexes and Access Methods Integrity Constraints http://ebooks.edhole.com
  13. 13. Physical Design Issues Size Speed of access Speed of update Growth issues: performance and degradation Security Maintenance http://ebooks.edhole.com
  14. 14. DBMS Organization Relationships: physical address pointers Links generated when data is entered Efficient but not flexible Ad hoc design Query dependent on specific DBMS (may support SQL) Relationships: logical data references Links generated when data is retrieved Flexible but not efficient Theoretical base SQL Structured Relational http://ebooks.edhole.com
  15. 15. DBMS Technology • CPU • Components • Operation • DASD • Technology • Organization • Data Transfer • Access methods http://ebooks.edhole.com
  16. 16. Physical Design Data Distribution Centralized Partitioned Horizontal Vertical Replicated Hybrid http://ebooks.edhole.com
  17. 17. Free Ebooks Download Mba Ebooks By Edhole Mba ebooks Free ebooks download http://ebooks.edhole.com
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