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Binary BLOB storage

Binary BLOB storage

Binary BLOB storage

(OP)
Hi!
Anybody knows the way Interbase stores its binary BLOBs? Does it store the binary data itself or only points to a DB-outside storage place?

RE: Binary BLOB storage

Hi,

All data is stored inside the datafile (database). In each row with a BLOB value, a pointer to the actual blob is stored. If you retrieve the BLOB (via components or whatever), InterBase fetches the blob stream by following the pointer.

The pointer means that a blob is not stored "inline" - at the same data-page as the rest of the row(s). So you can easily have a lot of blobs per table and as long as you don't retrieve them, it won't harm speed fetching data from disk...

Martijn Tonies
InterBase Workbench - the developer tool for InterBase and Firebird
http://www.interbaseworkbench.com

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