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Binary BLOB storage

thread756-369277

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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