No sign up sex websites no email - Updating oracle table sequence

2)if you were designing a new app, regarding populating ID columns...

Would you create one sequence for all tables or one sequence per table?

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Table example: CREATE TABLE seqnum ( next_number NUMBER(1); 1. NEXTVAL); / / / SELECT * FROM seq_test; INSERT INTO seq_test VALUES (seq_maxval.

NEXTVAL); SELECT * FROM seq_test; INSERT INTO seq_test VALUES (seq_maxval.

NOTE: The alternative to sequences used in other RDBMS products is autonumbering and keeping the current number in a table. Unlock the seqnum table for the next transation CREATE TABLE campus_site ( site_id NUMBER(4), organization_name VARCHAR2(40), campus_name VARCHAR2(30), address_id NUMBER(10)); CREATE TABLE division ( division_id NUMBER(5), site_id NUMBER(4), division_name VARCHAR2(40), address_id NUMBER(10)); CREATE TABLE department ( department_id NUMBER(5), division_id NUMBER(5), department_name VARCHAR2(40), address_id NUMBER(10)); CREATE TABLE seq_test ( test NUMBER(10)); ; INSERT INTO campus_site (site_id, organization_name, campus_name) VALUES (seq_audit_tx. of Washington', 'Everett'); INSERT INTO division (division_id, site_id, division_name) VALUES (seq_audit_tx. CURRVAL, 'Science'); INSERT INTO department (department_id, division_id, department_name) VALUES (seq_audit_tx. CURRVAL, 'Astronomy'); SELECT * FROM campus_site; SELECT * FROM division; SELECT * FROM department; ROLLBACK; INSERT INTO campus_site (site_id, organization_name, campus_name) VALUES (seq_audit_tx. of Washington', 'Everett'); INSERT INTO division (site_id, division_id, division_name) VALUES (seq_audit_tx. NEXTVAL, 'Science'); INSERT INTO department (division_id, department_id, department_name) VALUES (seq_audit_tx. NEXTVAL, 'Astronomy'); SELECT * FROM campus_site; SELECT * FROM division; SELECT * FROM department; 10; INSERT INTO seq_test VALUES (seq_inc_by_ten.

Both of these other methods demand serialization as they can only dispense one number at a time. NEXTVAL); / / SELECT * FROM seq_test; ALTER TABLE seq_test ADD test2 NUMBER(10); desc seq_test INSERT INTO seq_test (test, test2) VALUES (seq_inc_by_ten. NEXTVAL); SELECT * FROM seq_test; INSERT INTO seq_test (test, test2) VALUES (seq_inc_by_ten. CURRVAL); SELECT * FROM seq_test; 5; INSERT INTO seq_test VALUES (seq_maxval.

I will keep any existing values for ID (If forget to disable the trigger).

The drawback is someone could insert their own non-sequence value that later gets "steped on" by the sequence. Asked: November 21, 2002 - pm UTC Answered by: Tom Kyte - Last updated: September 05, 2007 - pm UTC Category: Database - Version: 8.17 Viewed 10K times!This question is Tom, Like most, I put an "ID" column in many tables...In that fashion, you get both the new sequence and the blob locator in one trip -- it is already locked (assuming autocommit is off which it MUST be for all java programs that want to work correctly) Can we use sequence values as default values in the create table syntax, for example create table mytable(id number default my_seq.nextval, name varchar2(20)); Something like this....So when i insert rows in the table, i need not mention the id value, it should be automatically picked. It may surprise you, given this discussion, that our Oracle DBA is staunchly opposed to using Oracle sequence ID's REGARDLESS of the specifics of the implementation.More performant, 100% clear as to what is happening and export/import won't "hurt" you.

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