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Download Berkeley DB by SLEEPYCAT Sleepycat Software PDF

By SLEEPYCAT Sleepycat Software

This can be the legitimate details at the Berkeley DB, written via the creators. It indicates easy methods to upload and enforce this database procedure into present structures with no logging on for guide.

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Extra info for Berkeley DB

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The only fields that the routines may examine in the DBT structures are data and size fields. An example prefix comparison routine follows: u_int32_t compare_prefix(dbp, a, b) DB *dbp; const DBT *a, *b; { size_t cnt, len; u_int8_t *p1, *p2; cnt = 1; len = a size > b size ? = *p2) return (cnt); /* * They match up to the smaller of the two sizes. * Collate the longer after the shorter. */ if (a size < b size) return (a size + 1); if (b size < a size) return (b size + 1); return (b size); } The usefulness of this functionality is data-dependent, but in some datasets, it can produce significantly reduced tree sizes and faster search times.

The latter is fairly rare almost all applications show some form of locality of reference. That said, it is important not to increase your cache size beyond the capabilities of your system because it will result in reduced performance. Under many operating systems, tying down enough virtual memory will cause your memory and potentially your program to be swapped. This is especially likely on systems without unified OS buffer caches and virtual memory spaces because the buffer cache was allocated at boot time and so cannot be adjusted based on application requests for large amounts of virtual memory.

The Berkeley DB distribution includes complete source code for the Berkeley DB library, including all three Berkeley DB products and their supporting utilities, as well as complete documentation in HTML format. Part I: Reference Guide 35 36 Part I: Reference Guide The distribution does not include prebuilt binaries or libraries, or hard-copy documentation. Prebuilt libraries and binaries for some architecture/compiler combinations are available as part of Sleepycat Software's Berkeley DB support services.

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