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From: ron@manta.UUCP (Ron Broersma)
Newsgroups: comp.unix.wizards
Subject: ndbm(3) question.  4.3 BSD.
Message-ID: <256@manta.UUCP>
Date: Wed, 30-Sep-87 14:41:40 EDT
Article-I.D.: manta.256
Posted: Wed Sep 30 14:41:40 1987
Date-Received: Sun, 4-Oct-87 22:45:19 EDT
Organization: Naval Ocean Systems Center, San Diego
Lines: 21

We have an application which uses ndbm and recently grew to where key/content
pairs were larger than 1K.  This caused dbm_store to return an error.  But
the man page says this shouldn't happen until you hit 4K.

So, my questions are:

1.  Why does the man page say that the internal block size is 4096 when
    ndbm.h has PBLKSIZ set to 1024.  DBLKSIZ is already 4096.

2.  Are there any problems with changing this to 4096 other than it being
    incompatible with old databases?

3.  Wouldn't it make more sense to set DBLKSIZ to to whatever the filesystem
    blocksize is (st_blksize).

We did try to run it with PBLKSIZ set to 4096.  It seemed to work fine. The
other observation was that the .dir file was much smaller.

--Ron
ron@nosc.mil		(ARPA)
sdcsvax!nosc!ron	(UUCP)