Re: table names

On 16 Nov 2001 at 16:08 (+0000), K. Ari Krupnikov wrote:
| from 7.1 release notes:
|
| > Store tables as files named by OID (Vadim)
|
| until i upgraded to 7.1(.3), i used to track table sizes simply with ls
| -l. is there a simple way to see how much space a table takes on disk,
| short of
|
| select 'ln -s ' || oid || ' ' || relname from pg_class
| where relname not like 'pg%';

I've written some functions to enable:

brent=# SELECT oid, datname, pg_du_db(datname)
brent-# AS diskusage FROM pg_database;
oid | datname | diskusage
--------+-----------+-----------
190550 | brent | 1788
1 | template1 | 1714
16555 | template0 | 1714
(3 rows)

brent=# select relname,pg_du_rel(relname) as diskusage from pg_class
brent-# where (relkind='r' or relkind='i') and relname not like 'pg_%';
relname | diskusage
-------------+-----------
test_id_key | 17
test | 9
(2 rows)

the 'diskusage' is only an approximate value in Kb. The first query
returns diskusage by database name; the second returns diskusage by
relation name (on the current database connection). This is/was
largely done out of needing to track database size (for billing
purposes) -- I know a small shell script could do it, but I felt
like cutting my teeth on a simple c module, so the implementation
is less than perfect...

Tested on 7.1 and 7.2b2 -- no (major) problems encountered.

Read the README.

cheers.
brent

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