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42.21. pg_largeobject

The catalog pg_largeobject holds the data making up "large objects". A large object is identified by an OID assigned when it is created. Each large object is broken into segments or "pages" small enough to be conveniently stored as rows in pg_largeobject. The amount of data per page is defined to be LOBLKSIZE (which is currently BLCKSZ/4, or typically 2 kB).

Table 42-21. pg_largeobject Columns

Name Type References Description
loid oid   Identifier of the large object that includes this page
pageno int4   Page number of this page within its large object (counting from zero)
data bytea   Actual data stored in the large object. This will never be more than LOBLKSIZE bytes and may be less.

Each row of pg_largeobject holds data for one page of a large object, beginning at byte offset (pageno * LOBLKSIZE) within the object. The implementation allows sparse storage: pages may be missing, and may be shorter than LOBLKSIZE bytes even if they are not the last page of the object. Missing regions within a large object read as zeroes.


 
 
  Published courtesy of The PostgreSQL Global Development Group Design by Interspire