查看schema信息：
[pgsql@localhost bin]$ ./psql
psql (9.1.2)
Type "help" for help. pgsql=# create schema gaosche;
CREATE SCHEMA
pgsql=# select catalog_name,schema_name from information_schema.schemata ;
catalog_name | schema_name
--------------+--------------------
pgsql | pg_toast
pgsql | pg_temp_1
pgsql | pg_toast_temp_1
pgsql | pg_catalog
pgsql | public
pgsql | information_schema
pgsql | gaosche
(7 rows) pgsql=# select * from pg_namespace;
nspname | nspowner | nspacl
--------------------+----------+----------------------------
pg_toast | 10 |
pg_temp_1 | 10 |
pg_toast_temp_1 | 10 |
pg_catalog | 10 | {pgsql=UC/pgsql,=U/pgsql}
public | 10 | {pgsql=UC/pgsql,=UC/pgsql}
information_schema | 10 | {pgsql=UC/pgsql,=U/pgsql}
gaosche | 10 |
(7 rows) pgsql=#
故此，可以任务，schema，就是namespace。