Re: Question about TEMP tables

>  Make sure to show your full command(s) and the full, exact text of any errors.

OK, I use PostgreSQL version 9.4.1.

I create cluster 'main' and connect to it. After cluster init we have those shemas:

postgres=# SELECT nspname FROM pg_namespace ;
      nspname
--------------------
 pg_toast
 pg_temp_1
 pg_toast_temp_1
 pg_catalog
 public
 information_schema
(6 rows)

Owner of those schemas is postgres (OID 10).

Now we try to create TEMP TABLE, for example:

postgres=# CREATE TEMP TABLE temptable();
CREATE TABLE

Show namespaces:

postgres=# SELECT nspname FROM pg_namespace ;
      nspname
--------------------
 pg_toast
 pg_temp_1
 pg_toast_temp_1
 pg_catalog
 public
 information_schema
 pg_temp_2
 pg_toast_temp_2
(8 rows)

Now we create a new database testdb and connect to it:

CREATE DATABASE testdb;
\c testdb

SHOW namespaces of testdb (we already connect to it):

testdb=# SELECT nspname FROM pg_namespace ;
      nspname
--------------------
 pg_toast
 pg_temp_1
 pg_toast_temp_1
 pg_catalog
 public
 information_schema
(6 rows)

OK, namespaces pg_temp_2 and pg_toast_temp_2 are not visible. But pg_temp_1 and pg_toast_temp_1 are visible. WHY?

If we create some temp objects in testdb Postgres wiil create namespaces pg_temp_3 and pg_toast_temp_3.

Try to create temp table at pg_temp_1:

CREATE TEMP TABLE pg_temp_1.temptable();
ERROR: cannot create relations in temporary schemas of other sessions

I catch those error if I create some TEMP objects in postgres database.

-- 
Best regards, Dmitry Voronin