Download presentation
Presentation is loading. Please wait.
Published byIwan Hendri Agusalim Modified over 6 years ago
1
Database Programming Sections 11-12–Sequences, Indexes & Synonyms, Controlling User Access, Creating & Revoking Object Privileges 11/25/08
2
Marge Hohly
3
Database objects include:
Tables View Sequence – a shareable object used to automatically generate unique numbers Can be used for primary keys Can set increment interval Increment by (specifies interval between sequence numbers, need to be integer dft = 1) Start with (initial number of sequence, dft = 1) MAXVALUE (max. value of sequence) NOMAXVALUE (max of 10^27 for ascending & -1 fir descending) MinValue (min. sequence value) NoMinValue (min value of 1 for ascending, and –(10^27) for descending (default)) Cycle|NoCycle (specifies whether the sequence continues to generate values after reaching its max or min values (Dft = NoCycle)) Cahce n |NoCache (# of values Oracle server pre-allocates and keep in memory. Dft = 20 values. If system crashes, the values are lost) Marge Hohly
4
Marge Hohly
5
Marge Hohly
6
NEXTVAL – must qualify with sequence name. Sequence.NEXTVAL
Marge Hohly
7
Marge Hohly
8
Marge Hohly
9
Marge Hohly
10
Marge Hohly
11
Marge Hohly
12
Marge Hohly
13
Marge Hohly
14
Marge Hohly
15
Marge Hohly
16
Marge Hohly
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.