tablespace.source

postgresql8.3.4源码,开源数据库

-- create a tablespace we can use
CREATE TABLESPACE testspace LOCATION '@testtablespace@';
-- create a schema we can use
CREATE SCHEMA testschema;
-- try a table
CREATE TABLE testschema.foo (i int) TABLESPACE testspace;
SELECT relname, spcname FROM pg_catalog.pg_tablespace t, pg_catalog.pg_class c
    where c.reltablespace = t.oid AND c.relname = 'foo';
 relname |  spcname  
---------+-----------
 foo     | testspace
(1 row)

INSERT INTO testschema.foo VALUES(1);
INSERT INTO testschema.foo VALUES(2);
-- tables from dynamic sources
CREATE TABLE testschema.asselect TABLESPACE testspace AS SELECT 1;
SELECT relname, spcname FROM pg_catalog.pg_tablespace t, pg_catalog.pg_class c
    where c.reltablespace = t.oid AND c.relname = 'asselect';
 relname  |  spcname  
----------+-----------
 asselect | testspace
(1 row)

PREPARE selectsource(int) AS SELECT $1;
CREATE TABLE testschema.asexecute TABLESPACE testspace
    AS EXECUTE selectsource(2);
SELECT relname, spcname FROM pg_catalog.pg_tablespace t, pg_catalog.pg_class c
    where c.reltablespace = t.oid AND c.relname = 'asexecute';
  relname  |  spcname  
-----------+-----------
 asexecute | testspace
(1 row)

-- index
CREATE INDEX foo_idx on testschema.foo(i) TABLESPACE testspace;
SELECT relname, spcname FROM pg_catalog.pg_tablespace t, pg_catalog.pg_class c
    where c.reltablespace = t.oid AND c.relname = 'foo_idx';
 relname |  spcname  
---------+-----------
 foo_idx | testspace
(1 row)

-- let's try moving a table from one place to another
CREATE TABLE testschema.atable AS VALUES (1), (2);
CREATE UNIQUE INDEX anindex ON testschema.atable(column1);
ALTER TABLE testschema.atable SET TABLESPACE testspace;
ALTER INDEX testschema.anindex SET TABLESPACE testspace;
INSERT INTO testschema.atable VALUES(3);	-- ok
INSERT INTO testschema.atable VALUES(1);	-- fail (checks index)
ERROR:  duplicate key value violates unique constraint "anindex"
SELECT COUNT(*) FROM testschema.atable;		-- checks heap
 count 
-------
     3
(1 row)

-- Will fail with bad path
CREATE TABLESPACE badspace LOCATION '/no/such/location';
ERROR:  could not set permissions on directory "/no/such/location": No such file or directory
-- No such tablespace
CREATE TABLE bar (i int) TABLESPACE nosuchspace;
ERROR:  tablespace "nosuchspace" does not exist
-- Fail, not empty
DROP TABLESPACE testspace;
ERROR:  tablespace "testspace" is not empty
DROP SCHEMA testschema CASCADE;
NOTICE:  drop cascades to table testschema.atable
NOTICE:  drop cascades to table testschema.asexecute
NOTICE:  drop cascades to table testschema.asselect
NOTICE:  drop cascades to table testschema.foo
-- Should succeed
DROP TABLESPACE testspace;