aravind chandu wrote:
>           Blobs stores large amount can you please tell me 
> what is the limit i.e hw many kb of data can it store ? say 
> 4000k like that.
> 
>          For suppose if a 4000kb data can be stored using 
> blob and the data stored in blob is 3600k what about the 
> remaining data? will it allocates all the 4000kb data or will 
> it allocates only 3600kb data? Like char(100) it will 
> allocates all 100 bytes in memory and  varchar(100) which is 
> variable memory?

There are actually two data types that provide BLOB functionality:

Large Objects, which can be up to 2GB in size
(http://www.postgresql.org/docs/current/static/lo-intro.html)
and bytea, which can be up to 1GB in size
(http://www.postgresql.org/docs/current/static/datatype-binary.html).

Read the documentation for the pros and cons of each.

Both will only use (about) as much disk space as the actual object needs.

Yours,
Laurenz Albe

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