| jumping sequences [message #352510] |
Wed, 08 October 2008 02:11  |
TeiMar71
Messages: 7
Registered: February 2001
Location: AUT
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Junior Member |
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Hi,
sometimes sequences on my oracle rdbms are raising the values by 20.
I can remember a note that i read some years ago. This note said, that after a db crash or shutdown/startup or recovery sequences are raised by 20.
But in my case the sequence raises without any of these actions.
Can anyone explain this behavior!?!?!?
Regards
Mario
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| Re: jumping sequences [message #352522 is a reply to message #352517] |
Wed, 08 October 2008 03:08  |
TeiMar71
Messages: 7
Registered: February 2001
Location: AUT
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Junior Member |
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No, i'm not in a RAC!
all sequences increment by 1!
for 2 sequences i know they are not recreated, because they're mine ...
Regards
Mario
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| Re: jumping sequences [message #352548 is a reply to message #352525] |
Wed, 08 October 2008 06:29 |
TeiMar71
Messages: 7
Registered: February 2001
Location: AUT
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Junior Member |
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i have a little program that inserts rows in a table every 5 minutes. the time is continous but not the id. sometimes there is a step by 20. but it used to last a long time until i found this out.
Regards
Mario
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| Re: jumping sequences [message #352566 is a reply to message #352559] |
Wed, 08 October 2008 06:58 |
TeiMar71
Messages: 7
Registered: February 2001
Location: AUT
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Junior Member |
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this is the script of the table where this happens :
create table mylog ( id number, startdate date, text varchar2(1000));
create sequence seq_mylog increment by 1 start with 1;
create or replace trigger TMYLOG
before insert on MYLOG
for each row
begin
select seq_mylog.nextval into :new.id from DUAL;
end;
/
every 5 minutes starts a program that inserts a row using the following statement :
insert into mylog (startdate, text) values (sysdate, 'prog started');
Regards
Mario
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| Re: jumping sequences [message #352615 is a reply to message #352605] |
Wed, 08 October 2008 10:43 |
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Michel Cadot
Messages: 68718
Registered: March 2007
Location: Saint-Maur, France, https...
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Senior Member
Account Moderator |
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| TeiMar71 wrote on Wed, 08 October 2008 16:47 | that's it ... i think i should set all sequences to NOCACHE !
Regards
Mario
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This was not my question but you could do this and if course you will have overhead and possibly waits on this sequence.
Regards
Michel
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