how to alter sequence.

On 4 Dec 2002 at 4:29, raja kumar thatte wrote:

Hai friends,
I have a sequence called raj_seq with max value 3000.
I have a table, with one field haveing
nextvalu('raj_seq') as default value.;
now i wanted to increase the max value of the raj_seq
to 9999999.
How to do this change?

http://www.postgresql.org/idocs/index.php?functions-sequence.html
Look for setval
--
Dan Langille : http://www.langille.org/

Hai friend,
Thanks. But I wanted to change the maximum value but
not current value. How to change the maximum value of
a sequence

raja

--- Dan Langille <dan@langille.org> wrote:

On 4 Dec 2002 at 4:29, raja kumar thatte wrote:

Hai friends,
I have a sequence called raj_seq with max value

3000.

I have a table, with one field haveing
nextvalu('raj_seq') as default value.;
now i wanted to increase the max value of the

raj_seq

to 9999999.
How to do this change?

http://www.postgresql.org/idocs/index.php?functions-sequence.html

Look for setval
--
Dan Langille : http://www.langille.org/

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On 4 Dec 2002 at 5:20, raja kumar thatte wrote:

Hai friend,
Thanks. But I wanted to change the maximum value but
not current value. How to change the maximum value of
a sequence

I'm sorry. I shouldn't reply to questions first thing in the
morning.

That I don't know, but I'm sure it can be done.... someone else will
know.
--
Dan Langille : http://www.langille.org/

Drop the sequence and recreate with a min. value greater your last value and
the new max. value.

Egon

raja kumar thatte wrote:

I meant start value (inst. min.).

Egon Reetz wrote:

Thsnkd
--- Egon Reetz <reetz@usco.de> wrote:

I meant start value (inst. min.).

Egon Reetz wrote:

Drop the sequence and recreate with a min. value

greater your last value and

the new max. value.

Egon

raja kumar thatte wrote:

Hai friends,
I have a sequence called raj_seq with max value

3000.

I have a table, with one field haveing
nextvalu('raj_seq') as default value.;
now i wanted to increase the max value of the

raj_seq

to 9999999.
How to do this change?
If i drop and recreate the raj_seq, then i have

to

recreate the table and all triggers working on

that

table.But it is not an acceptable solution.
So with out droping raj_seq , how do I solve

this

problem.
Thanks in advance.
have a nice time.
raja

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Thanks
--- Egon Reetz <reetz@usco.de> wrote:

I meant start value (inst. min.).

Egon Reetz wrote:

Drop the sequence and recreate with a min. value

greater your last value and

the new max. value.

Egon

raja kumar thatte wrote:

Hai friends,
I have a sequence called raj_seq with max value

3000.

I have a table, with one field haveing
nextvalu('raj_seq') as default value.;
now i wanted to increase the max value of the

raj_seq

to 9999999.
How to do this change?
If i drop and recreate the raj_seq, then i have

to

recreate the table and all triggers working on

that

table.But it is not an acceptable solution.
So with out droping raj_seq , how do I solve

this

problem.
Thanks in advance.
have a nice time.
raja

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On Wed, 2002-12-04 at 12:29, raja kumar thatte wrote:

Hai friends,
I have a sequence called raj_seq with max value 3000.

...

now i wanted to increase the max value of the raj_seq
to 9999999.
How to do this change?
If i drop and recreate the raj_seq, then i have to
recreate the table and all triggers working on that
table.But it is not an acceptable solution.
So with out droping raj_seq , how do I solve this
problem.

Unfortunately there doesn't seem to be any easy way to do this. There
is no ALTER SEQUENCE command and you can't use UPDATE on a sequence.

Hackers: Could this be a TODO item for 7.4?

The easiest way to do this at present is probably to dump the database,
edit the dump to change the sequence max_value and then recreate the
database from the edited dump. I presume you used CREATE SEQUENCE in
order to get such a low max_value. If it were created from a SERIAL
datatype, you would also have to edit the table definition to use a
pre-created sequence. There is no means of specifying a max_value using
SERIAL.

--
Oliver Elphick <olly@lfix.co.uk>
LFIX Limited

Oliver Elphick kirjutas K, 04.12.2002 kell 19:06:

On Wed, 2002-12-04 at 12:29, raja kumar thatte wrote:

Hai friends,
I have a sequence called raj_seq with max value 3000.

...

now i wanted to increase the max value of the raj_seq
to 9999999.
How to do this change?
If i drop and recreate the raj_seq, then i have to
recreate the table and all triggers working on that
table.But it is not an acceptable solution.
So with out droping raj_seq , how do I solve this
problem.

Unfortunately there doesn't seem to be any easy way to do this. There
is no ALTER SEQUENCE command and you can't use UPDATE on a sequence.

Hackers: Could this be a TODO item for 7.4?

This seems to work - as an example why we need the TODO ;)

hannu=# update seq set max_value = 99;
ERROR: You can't change sequence relation seq
hannu=# update pg_class set relkind = 'r' where relname = 'seq';
UPDATE 1
hannu=# update seq set max_value = 99;
UPDATE 1
hannu=# update pg_class set relkind = 'S' where relname = 'seq';
UPDATE 1
hannu=# select * from seq;
sequence_name | last_value | increment_by | max_value | min_value |
cache_value | log_cnt | is_cycled | is_called
---------------+------------+--------------+-----------+-----------+-------------+---------+-----------+-----------
seq | 1 | 1 | 99 | 1
| 1 | 1 | f | f
(1 row)

I can't really recommend it, because it may (or may not ;) have some
unwanted behaviours as well;

The easiest way to do this at present is probably to dump the database,
edit the dump to change the sequence max_value and then recreate the
database from the edited dump. I presume you used CREATE SEQUENCE in
order to get such a low max_value. If it were created from a SERIAL
datatype, you would also have to edit the table definition to use a
pre-created sequence. There is no means of specifying a max_value using
SERIAL.

--
Hannu Krosing <hannu@tm.ee>

On 4 Dec 2002 at 20:41, Hannu Krosing wrote:

hannu=# update seq set max_value = 99;
ERROR: You can't change sequence relation seq
hannu=# update pg_class set relkind = 'r' where relname = 'seq';
UPDATE 1
hannu=# update seq set max_value = 99;
UPDATE 1
hannu=# update pg_class set relkind = 'S' where relname = 'seq';
UPDATE 1
hannu=# select * from seq;
sequence_name | last_value | increment_by | max_value | min_value |
cache_value | log_cnt | is_cycled | is_called
---------------+------------+--------------+-----------+-----------+-------------+---------+-----------+-----------
seq | 1 | 1 | 99 | 1
| 1 | 1 | f | f

That makes me wonder. If sequense is treated like a single column single row
table and it's value is guarenteed to be increasing even in case of aborted
transaction, is it correct to say that postgresql already has nested
transactions, albeit dormant?

Bye
Shridhar

--
Zero Defects, n.: The result of shutting down a production line.

Shridhar Daithankar kirjutas K, 04.12.2002 kell 20:51:

On 4 Dec 2002 at 20:41, Hannu Krosing wrote:

hannu=# update seq set max_value = 99;
ERROR: You can't change sequence relation seq
hannu=# update pg_class set relkind = 'r' where relname = 'seq';
UPDATE 1
hannu=# update seq set max_value = 99;
UPDATE 1
hannu=# update pg_class set relkind = 'S' where relname = 'seq';
UPDATE 1
hannu=# select * from seq;
sequence_name | last_value | increment_by | max_value | min_value |
cache_value | log_cnt | is_cycled | is_called
---------------+------------+--------------+-----------+-----------+-------------+---------+-----------+-----------
seq | 1 | 1 | 99 | 1
| 1 | 1 | f | f

I just discovered that changing these numbers does not change how the
sequence behaves ;(

Even after restarting the backend! Sorry!

That makes me wonder. If sequense is treated like a single column single row
table and it's value is guarenteed to be increasing even in case of aborted
transaction, is it correct to say that postgresql already has nested
transactions, albeit dormant?

No. Sequences live outside of transactions. I have no idea why there is
also a ingle column single row table created.

The output of \d command is also weird, for all sequences I get:

hannu=# \d seq
Sequence "public.seq"
Column | Type
---------------+---------
sequence_name | name
last_value | bigint
increment_by | bigint
max_value | bigint
min_value | bigint
cache_value | bigint
log_cnt | bigint
is_cycled | boolean
is_called | boolean

with only the Sequence name changing ...

---------------
Hannu

On Wed, 2002-12-04 at 09:06, Oliver Elphick wrote:

On Wed, 2002-12-04 at 12:29, raja kumar thatte wrote:

Hai friends,
I have a sequence called raj_seq with max value 3000.

...

now i wanted to increase the max value of the raj_seq
to 9999999.
How to do this change?
If i drop and recreate the raj_seq, then i have to
recreate the table and all triggers working on that
table.But it is not an acceptable solution.
So with out droping raj_seq , how do I solve this
problem.

Unfortunately there doesn't seem to be any easy way to do this. There
is no ALTER SEQUENCE command and you can't use UPDATE on a sequence.

Hackers: Could this be a TODO item for 7.4?

I'm hoping to do that one sooner than later, unless Neil beats me to it.

--
Rod Taylor <rbt@rbt.ca>

PGP Key: http://www.rbt.ca/rbtpub.asc

Around 20:41 on Dec 4, 2002, Hannu Krosing said:

What's wrong with this:

dustin=# create sequence test_seq;
CREATE SEQUENCE
dustin=# select nextval('test_seq');
nextval
---------
1
(1 row)

dustin=# select setval('test_seq', 9999);
setval
--------
9999
(1 row)

dustin=# select nextval('test_seq');
nextval
---------
10000
(1 row)

# Oliver Elphick kirjutas K, 04.12.2002 kell 19:06:
# > On Wed, 2002-12-04 at 12:29, raja kumar thatte wrote:
# > > Hai friends,
# > > I have a sequence called raj_seq with max value 3000.
# > ...
# > > now i wanted to increase the max value of the raj_seq
# > > to 9999999.
# > > How to do this change?
# > > If i drop and recreate the raj_seq, then i have to
# > > recreate the table and all triggers working on that
# > > table.But it is not an acceptable solution.
# > > So with out droping raj_seq , how do I solve this
# > > problem.
# >
# > Unfortunately there doesn't seem to be any easy way to do this. There
# > is no ALTER SEQUENCE command and you can't use UPDATE on a sequence.
# >
# > Hackers: Could this be a TODO item for 7.4?
#
# This seems to work - as an example why we need the TODO ;)
#
# hannu=# update seq set max_value = 99;
# ERROR: You can't change sequence relation seq
# hannu=# update pg_class set relkind = 'r' where relname = 'seq';
# UPDATE 1
# hannu=# update seq set max_value = 99;
# UPDATE 1
# hannu=# update pg_class set relkind = 'S' where relname = 'seq';
# UPDATE 1
# hannu=# select * from seq;
# sequence_name | last_value | increment_by | max_value | min_value |
# cache_value | log_cnt | is_cycled | is_called
# ---------------+------------+--------------+-----------+-----------+-------------+---------+-----------+-----------
# seq | 1 | 1 | 99 | 1
# | 1 | 1 | f | f
# (1 row)
#
# I can't really recommend it, because it may (or may not ;) have some
# unwanted behaviours as well;
#
#
# >
# > The easiest way to do this at present is probably to dump the database,
# > edit the dump to change the sequence max_value and then recreate the
# > database from the edited dump. I presume you used CREATE SEQUENCE in
# > order to get such a low max_value. If it were created from a SERIAL
# > datatype, you would also have to edit the table definition to use a
# > pre-created sequence. There is no means of specifying a max_value using
# > SERIAL.
# --
# Hannu Krosing <hannu@tm.ee>
#
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#
#

--
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pub 1024/3CAE01D5 1994/11/03 Dustin Sallings <dustin@spy.net>
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L_______________________ I hope the answer won't upset her. ____________

On Wed, Dec 04, 2002 at 09:33:52AM -0800, Dustin Sallings wrote:

Around 20:41 on Dec 4, 2002, Hannu Krosing said:

What's wrong with this:

dustin=# create sequence test_seq;
CREATE SEQUENCE
dustin=# select nextval('test_seq');
nextval
---------
1
(1 row)

dustin=# select setval('test_seq', 9999);
setval
--------
9999
(1 row)

dustin=# select nextval('test_seq');
nextval
---------
10000
(1 row)

Dustin --

The thread here is about how to raise the *max* value for the sequence,
not how to set the current value higher. The sequence in question was
created with a too-low maximum value (see help on CREATE SEQUENCE for
options); the user now wants to raise it.

- J.
--

Joel BURTON | joel@joelburton.com | joelburton.com | aim: wjoelburton
Independent Knowledge Management Consultant

Around 12:44 on Dec 4, 2002, Joel Burton said:

# The thread here is about how to raise the *max* value for the sequence,
# not how to set the current value higher. The sequence in question was
# created with a too-low maximum value (see help on CREATE SEQUENCE for
# options); the user now wants to raise it.

Ahh, OK. Seemed too obvious. :)

--
SPY My girlfriend asked me which one I like better.
pub 1024/3CAE01D5 1994/11/03 Dustin Sallings <dustin@spy.net>
| Key fingerprint = 87 02 57 08 02 D0 DA D6 C8 0F 3E 65 51 98 D8 BE
L_______________________ I hope the answer won't upset her. ____________

On Wed, 2002-12-04 at 17:33, Dustin Sallings wrote:

What's wrong with this:

dustin=# create sequence test_seq;
CREATE SEQUENCE
dustin=# select nextval('test_seq');
nextval
---------
1
(1 row)

dustin=# select setval('test_seq', 9999);
setval
--------
9999
(1 row)

dustin=# select nextval('test_seq');
nextval
---------
10000
(1 row)

It's not the issue. The original question was how to change the upper
limit of the sequence's range, not its current value.

junk=# create sequence foo_seq maxvalue 3000;
CREATE SEQUENCE
junk=# select nextval('foo_seq');
nextval
---------
1
(1 row)

junk=# select setval('foo_seq', 999999);
ERROR: foo_seq.setval: value 999999 is out of bounds (1,3000)

--
Oliver Elphick <olly@lfix.co.uk>
LFIX Limited

Oliver Elphick wrote:

On Wed, 2002-12-04 at 12:29, raja kumar thatte wrote:

Hai friends,
I have a sequence called raj_seq with max value 3000.

...

now i wanted to increase the max value of the raj_seq
to 9999999.
How to do this change?
If i drop and recreate the raj_seq, then i have to
recreate the table and all triggers working on that
table.But it is not an acceptable solution.
So with out droping raj_seq , how do I solve this
problem.

Unfortunately there doesn't seem to be any easy way to do this. There
is no ALTER SEQUENCE command and you can't use UPDATE on a sequence.

Gee, I thought they could just update the sequence table, but I see:

test=> update yy set max_value = 100;
ERROR: You can't change sequence relation yy

Hackers: Could this be a TODO item for 7.4?

Added to TODO:

* Add ALTER SEQUENCE to modify min/max/increment/cache/cycle values

-- 
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 359-1001
  +  If your life is a hard drive,     |  13 Roberts Road
  +  Christ can be your backup.        |  Newtown Square, Pennsylvania 19073

Thanks everybody.

--- Bruce Momjian <pgman@candle.pha.pa.us> wrote:

Oliver Elphick wrote:

On Wed, 2002-12-04 at 12:29, raja kumar thatte

wrote:

Hai friends,
I have a sequence called raj_seq with max value

3000.

...

now i wanted to increase the max value of the

raj_seq

to 9999999.
How to do this change?
If i drop and recreate the raj_seq, then i have

to

recreate the table and all triggers working on

that

table.But it is not an acceptable solution.
So with out droping raj_seq , how do I solve

this

problem.

Unfortunately there doesn't seem to be any easy

way to do this. There

is no ALTER SEQUENCE command and you can't use

UPDATE on a sequence.

Gee, I thought they could just update the sequence
table, but I see:

test=> update yy set max_value = 100;
ERROR: You can't change sequence relation yy

Hackers: Could this be a TODO item for 7.4?

Added to TODO:

* Add ALTER SEQUENCE to modify
min/max/increment/cache/cycle values

-- 
Bruce Momjian                        | 
http://candle.pha.pa.us
pgman@candle.pha.pa.us               |  (610)
359-1001
+  If your life is a hard drive,     |  13 Roberts
Road
+  Christ can be your backup.        |  Newtown
Square, Pennsylvania 19073

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Doesn't dropping and recreating the sequence suit the bill ?

whats' the major advantage to implement em as a command?

At least one thing from which all of us can benifit in PgSQL
is replication. I just hope 7.4 give us some sort of master/slave replication.

Regds
Mallah.

On Wednesday 04 December 2002 11:53 pm, Bruce Momjian wrote:

Oliver Elphick wrote:

On Wed, 2002-12-04 at 12:29, raja kumar thatte wrote:

Hai friends,
I have a sequence called raj_seq with max value 3000.

...

now i wanted to increase the max value of the raj_seq
to 9999999.
How to do this change?
If i drop and recreate the raj_seq, then i have to
recreate the table and all triggers working on that
table.But it is not an acceptable solution.
So with out droping raj_seq , how do I solve this
problem.

Unfortunately there doesn't seem to be any easy way to do this. There
is no ALTER SEQUENCE command and you can't use UPDATE on a sequence.

Gee, I thought they could just update the sequence table, but I see:

test=> update yy set max_value = 100;
ERROR: You can't change sequence relation yy

Hackers: Could this be a TODO item for 7.4?

Added to TODO:

* Add ALTER SEQUENCE to modify min/max/increment/cache/cycle values

--
Rajesh Kumar Mallah,
Project Manager (Development)
Infocom Network Limited, New Delhi
phone: +91(11)6152172 (221) (L) ,9811255597 (M)

Visit http://www.trade-india.com ,
India's Leading B2B eMarketplace.