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Subject cvs commit: apache-1.3/src/support dbmmanage.1
Date Wed, 03 Mar 1999 20:39:34 GMT
brian       99/03/03 12:39:34

  Modified:    src/support dbmmanage.1
  Scratching an itch... documenting the difference between different DBM files
  in an attempt to stave off some support questions.
  Revision  Changes    Path
  1.6       +48 -1     apache-1.3/src/support/dbmmanage.1
  Index: dbmmanage.1
  RCS file: /home/cvs/apache-1.3/src/support/dbmmanage.1,v
  retrieving revision 1.5
  retrieving revision 1.6
  diff -u -r1.5 -r1.6
  --- dbmmanage.1	1999/01/01 19:05:33	1.5
  +++ dbmmanage.1	1999/03/03 20:39:33	1.6
  @@ -86,7 +86,8 @@
   found at
   .IP \fB\fIfilename\fP
  -The filename of the DBM format file. Usually without the extension .pag or .dir.
  +The filename of the DBM format file. Usually without the 
  +extension .db, .pag, or .dir.
   .IP \fB\fIcommand\fP
   This selects the operation to perform:
   .TP 12
  @@ -118,6 +119,52 @@
   Just displays the complete contents of the DBM file.
   .IP \fB\fIusername\fP
   The user for which the update operation is performed.
  +One should be aware that there are a number of different DBM file
  +formats in existance, and with all likelihood, libraries for more than
  +one format may exist on your system.  The three primary examples are
  +NDBM, the GNU project's GDBM, and Berkeley DB 2.  Unfortunately, all
  +these libraries use different file formats, and you must make sure
  +that the file format used by
  +.I filename
  +is the same format that 
  +.B dbmmanage
  +expects to see.  
  +.B dbmmanage
  +currently has no way of determining what type of DBM file it is
  +looking at.  If used against the wrong format, 
  +will simply return nothing, or may create a different DBM file with a
  +different name, or at worst, it may corrupt the DBM file if you were
  +attempting to write to it.
  +.B dbmmanage
  +has a list of DBM format preferences, defined by the 
  +.B @AnyDBM::ISA
  +array near the beginning of the program.  Since we prefer the Berkeley
  +DB 2 file format, the order in which
  +.B dbmmanage 
  +will look for system libraries is Berkeley DB 2, then NDBM, and then
  +GDBM.  The first library found will be the library
  +.B dbmmanage
  +will attempt to use for all DBM file transactions.  This ordering is
  +slightly different than the standard 
  +.B @AnyDBM::ISA
  +ordering in perl, as well as the ordering used by the simple dbmopen()
  +call in Perl, so if you use any other utilities to manage your DBM
  +files, they must also follow this preference ordering.  Similar care
  +must be taken if using programs in other languages, like C, to 
  +access these files.
  +.B mod_auth_db.c 
  +module corresponds to Berkeley DB 2 library, while
  +.B mod_auth_dbm.c
  +corresponds to the NDBM library.  Also, one can usually use the 
  +.B file
  +program supplied with most Unix systems to see what format a DBM file is in.
   .BR httpd(8)

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