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Thread: system table/view and sequence

system table/view and sequence

From
Olivier Baheux
Date:
i'm trying to find where are stored sequence definition
(increment,minvalue,maxvalue,start,cache) in system tables. Atm I
found everything exept sequence.

Thanks in advance.

Re: system table/view and sequence

From
Nicolas Barbier
Date:
2010/4/7 Olivier Baheux <olivierbaheux@gmail.com>:

> i'm trying to find where are stored sequence definition
> (increment,minvalue,maxvalue,start,cache) in system tables. Atm I
> found everything exept sequence.

It's in the sequence itself (which can be accessed like a table). The
fact that this "table" is in fact a sequence is stored in pg_class:

--------8<--------
itsme=# CREATE TABLE a (i serial);
HINWEIS:  CREATE TABLE erstellt implizit eine Sequenz »a_i_seq« für
die »serial«-Spalte »a.i«
CREATE TABLE
itsme=# SELECT * FROM a_i_seq;sequence_name | last_value | increment_by |      max_value      |
min_value | cache_value | log_cnt | is_cycled | is_called

---------------+------------+--------------+---------------------+-----------+-------------+---------+-----------+-----------a_i_seq
     |          1 |            1 | 9223372036854775807 |   1 |           1 |       1 | f         | f 
(1 Zeile)

itsme=# SELECT relkind FROM pg_class WHERE relname = 'a_i_seq';relkind
---------S
(1 Zeile)
-------->8--------

Nicolas

Re: system table/view and sequence

From
Olivier Baheux
Date:
On 7 avr, 17:44, nicolas.barb...@gmail.com (Nicolas Barbier) wrote:
> 2010/4/7 Olivier Baheux <olivierbah...@gmail.com>:
>
> > i'm trying to find where are stored sequence definition
> > (increment,minvalue,maxvalue,start,cache) in system tables. Atm I
> > found everything exept sequence.
>
> It's in the sequence itself (which can be accessed like a table). The
> fact that this "table" is in fact a sequence is stored in pg_class:
>
> --------8<--------
> itsme=# CREATE TABLE a (i serial);
> HINWEIS:  CREATE TABLE erstellt implizit eine Sequenz »a_i_seq« für
> die »serial«-Spalte »a.i«
> CREATE TABLE
> itsme=# SELECT * FROM a_i_seq;
>  sequence_name | last_value | increment_by |      max_value      |
> min_value | cache_value | log_cnt | is_cycled | is_called
>
---------------+------------+--------------+---------------------+-----------+-------------+---------+-----------+-----------
>  a_i_seq       |          1 |            1 | 9223372036854775807 |
>     1 |           1 |       1 | f         | f
> (1 Zeile)
>
> itsme=# SELECT relkind FROM pg_class WHERE relname = 'a_i_seq';
>  relkind
> ---------
>  S
> (1 Zeile)
> -------->8--------
>
> Nicolas
>
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it work, thanx so much