Guillaume Drolet wrote:
>>>> If you want to move a whole database to a different tablespace (the only 
>>>> reason
>>>> I can think of for doing what you are trying to so), use the command
>>>> ALTER DATABASE ... SET TABLESPACE ...

>>> Thanks Laurenz. I tried your suggestion:
>>>
>>> psql -U postgres -c "ALTER DATABASE mydb SET TABLESPACE pg_default;"
>>>
>>> I get this message:
>>> ERROR:  some relations of database "mortalite" are already in tablespace 
>>> "pg_default"
>>> HINT : You must move them back to the database's default tablespace before 
>>> using this command.
>>>
>>> But if I do "SHOW default_tablespace;" in mydb, it showed "pg_default" as 
>>> the default tablespace.
>>>
>>> So I tried changing it back to the tablespace I want to get rid of to 
>>> subsequently moved everything
>>> back there so that ultimately, it lets me move everything to pg_default:
>>> ALTER DATABASE mydb SET default_tablespace = diamonds;
>>>
>>> And then:
>>> psql -U postgres -c "ALTER DATABASE mydb SET TABLESPACE diamonds;"
>>>
>>> ALTER DATABASE is issued but nothing gets physically moved to diamonds. Why?
>> 
>> I guess the problem is that you already moved a lot of tables around.
>> 
>> Could you connect to the database and try the following:

>> SELECT t.relname, t.reltablespace, sp.spcname
>> FROM pg_class t LEFT JOIN
>>      pg_tablespace sp ON sp.oid = t.reltablespace;

>                          relname                          | reltablespace |  
> spcname
> ----------------------------------------------------------+---------------+------------
[...]
>  mod09a1_sur_refl_b05_amonth_idx                          |          1663 | 
> pg_default
>  mod44b_cloud_rid_seq                                     |             0 |
>  pg_toast_2619                                            |             0 |
>  pg_type                                                  |             0 |
>  pg_authid_rolname_index                                  |          1664 | 
> pg_global
>  pg_authid_oid_index                                      |          1664 | 
> pg_global
[...]

Like Tom suggested, you should move the tables from "pg_default" back to the 
database's
default tablespace and then use ALTER DATABASE to move the database tablespace.

Yours,
Laurenz Albe


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