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31.1. Introduction

All large objects are placed in a single system table called pg_largeobject. PostgreSQL also supports a storage system called "TOAST" that automatically stores values larger than a single database page into a secondary storage area per table. This makes the large object facility partially obsolete. One remaining advantage of the large object facility is that it allows values up to 2 GB in size, whereas TOASTed fields can be at most 1 GB. Also, large objects can be randomly modified using a read/write API that is more efficient than performing such operations using TOAST.


July 18, 2008, 9:05 p.m.

I have successfully loaded and retrieved an 8.1 GB object using lo_create()/lo_write()/lo_close() and \lo_export with PostgreSQL 8.3.3 on Linux 86_64, so I suspect the 2 GB size limit mentioned in this article is obsolete.

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