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Re: How to get the physical locations of tables, views, functions etc of Postgresql in Windows & Linux?

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Hi Raghavendra,

 

Is it sure that we can copy only the data of Postgresql from one disk to other seamlessly and then I can reuse the content without any hassle? If so, tablespace is what I should create first?

Please clarify me on this.

 

Thanks & Regards,

Siva.

 

From: Raghavendra [mailto:raghavendra.rao@xxxxxxxxxxxxxxxx]
Sent: Thursday, May 03, 2012 7:09 PM
To: Siva Palanisamy
Cc: pgsql-general@xxxxxxxxxxxxxx
Subject: Re: How to get the physical locations of tables, views, functions etc of Postgresql in Windows & Linux?

 

On Thu, May 3, 2012 at 6:52 PM, Siva Palanisamy <siva_p@xxxxxxx> wrote:

Hi there! I'm interested to get the physical locations of tables, views, functions, data/content available in the tables of PostgreSQL in Linux OS. I've a scenario that PostgreSQL could be installed in SD-Card facility and Hard-Disk. If I've tables, views, functions, data in SD, I want to get the physical locations of the same and merge/copy into my hard-disk whenever I wish to replace the storage space. I hope the storage of database should be in terms of plain files architecture.

You first step should start from $PGDATA/base/, you find OID's as directories which are related to each database of your cluster. In OID's directory, you find all the objects ID's for Tables/indexes/view etc., 

 

To know the object id, you can use a system defined function.

 

postgres=# select pg_relation_filepath('foo');

 pg_relation_filepath 

----------------------

 base/12780/16407

(1 row)

 

12780, is database OID.

 

For moving objects from one drive to other, you need to use tablespaces.

 

Also, can I able to see the contents by opening its files? I mean, can I able to access it? Please help me on this. Thanks!

 

You cannot know the contents in files, unless u are good hacker :)

---

Regards,

Raghavendra

EnterpriseDB Corporation





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