Resetting sequences....

Hi all,
I have this table which uses sequence as pk and somehow it went out-of-sync....i try to reset it using something like...
alter sequence <seq_name>
increment by 1
minvalue <maxvalue_at_present>
my question is
--how a sequence went out-of-sync all of a sudden when it has the maxvalue set to 999999999999999999999999999 ???
-- can i reset the sequence back to some mid-number....example
say if the seq was 9000 and it got reset by next 9000 (my mistake). Now the nextval from dual is 18000. since 9000 was incremented by another 9000 which are not used, can we reset it back to 9000 and then increment it by 1 again???
Any help is highly appreciated...thanks in advance....

Totally agree with everyone that there really shouldn't be a need to reset sequences, but I do know when doing testing there can be circumstances when you want the sequence to start at a particular value in order to bring disperate things back into sync... so in answer to...
can i reset the sequence back to some mid-numberYes you can...
e.g. I want to reset my sequence to 50...
SQL> select test.nextval from dual;
   NEXTVAL
       125
SQL> var v_inc number;
SQL> var v_resetno number;
SQL> exec :v_resetno := 50;
PL/SQL procedure successfully completed.
SQL> exec execute immediate 'select -(test.nextval-:x)-1 from dual' into :v_inc using :v_resetno;
PL/SQL procedure successfully completed.
SQL> exec execute immediate 'alter sequence test increment by '||:v_inc;
PL/SQL procedure successfully completed.
SQL> select test.nextval from dual;
   NEXTVAL
        49
SQL> alter sequence test increment by 1;
Sequence altered.
-- JOB DONE. The sequence is now ready to use... and will start at 50...
SQL> select test.nextval from dual;
   NEXTVAL
        50
SQL> select test.nextval from dual;
   NEXTVAL
        51
SQL>

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JKMourya wrote:
i hve created two table. and a sequence for other table. i want to do that when i insert into a first table, entries of other table should be deleted and sequence value should reset to 1. For that i have executed the following sql code
but getting the error:
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after insert on m_sale_bill
for each row
begin
DELETE FROM M_TEMP;
<<COLUMN_SEQUENCES>>
BEGIN
Alter Sequence M_TEMP_SEQ Restart with 1;
END COLUMN_SEQUENCES;
end;
Alter Trigger m_sale_ainsert_trig enable;
Warning: execution completed with warning
Trigger m_sale_ainsert_trig Compiled.
Alter Trigger m_sale_ainsert_trig succeeded.
5/4 PLS-00103: Encountered the symbol "ALTER" when expecting one of the following:
( begin case declare exit for goto if loop mod null pragma
raise return select update while with <an identifier>
<a double-quoted delimited-identifier> <a bind variable> <<
continue close current delete fetch lock insert open rollback
savepoint set sql execute commit forall merge pipe purge
pls rectify it!!!!! what are the mistakes in this code?
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That was a useful post for resetting a base station to default settings, however it does create a problem.
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Query of the sequence

Is it possible to change sequence value on monthly basis.
ex. I want to start sequence from 1to 1000 and then reset from 1 to 1000 after month.
for every month i want to reset sequence is it possible.
Thanks in advance

Hi,
I agree with Gj. I think you should use dbms_scheduler to do this at the beginning of every month.
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PROMPT     ========== reset_seq procedure ==========
CREATE OR REPLACE PROCEDURE     reset_seq
(     in_seq_name     IN     VARCHAR2     -- Name of sequence to be reset
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AUTHID     CURRENT_USER
AS
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SHOW ERRORS
PROMPT     ========== Creating sequence ==========
DROP SEQUENCE     x_seq;
CREATE SEQUENCE     x_seq
MINVALUE     0
NOCACHE
START WITH     1;
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SELECT     x_seq.NEXTVAL
FROM     dual
CONNECT BY     LEVEL     <= 5;
PROMPT     ========== Re-setting sequence ==========
EXECUTE     reset_seq ('x_seq');
SELECT     x_seq.NEXTVAL     AS new_improved
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Primary key, column, sequence : best practice.

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Unless you know the exact number of rows your table will have, it is not convenient to limit the size. Now it all depend on what you mean by limiting the size and which column type you are talking about.
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In general, it is a bad idea to try to encode information into a key because it
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- complicates updates to the data in the future
- can easily be generated on the fly from other data elements
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Can we restart the sequence at any moment without define max val

Hi all
can we restart the sequence without define the max value
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Hi,
Refer to : http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:1119633817597
http://www.jaredstill.com/content/reset-sequence.html
- Pavan Kumar N

Can not create a sequence inside procedure

I have a procedure like this:
CREATE OR REPLACE PROCEDURE P_reset_Sequences AS
BEGIN
execute immediate '
DROP SEQUENCE ADMIN_AUTORESPONSES_SEQ';
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There are two reasons to reset a sequence in code.
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Running out of numbers is a problem every [3,000,000,000,000,000,000,000,000,000 years|Re: What kind of transaction in procedure? or thereabouts.
Looking at the sequence definition with NOCACHE , ORDER and an INCREMENT by 1 it appears the OP mistakenly believes you can use a sequence as a gap free counter ignoring rollbacks, exceptions and shutdowns amongst other things, when all those setting have really done is [make the sequence as slow as possible|http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:6393918681776].

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