% dbxreport -indexdir . 
Validate index and report internals for dbx databases
EMBOSS database name: embl
Index fields [id]: id,acc
Output file [embl.dbxreport]: 

Validate index and report internals for dbx databases
Version: EMBOSS:6.6.0.0

   Standard (Mandatory) qualifiers:
  [-dbname]            string     EMBOSS database name (Any string from 2 to
                                  19 characters, matching regular expression
                                  /[A-z][A-z0-9_]+/)
  [-fields]            string     [id] A list of index fields separated by
                                  spaces or commas. (Any string)
   -outfile            outfile    [*.dbxreport] Output file name

   Additional (Optional) qualifiers: (none)
   Advanced (Unprompted) qualifiers:
   -indexdir           directory  Index directory (optional)
   -fullreport         boolean    [N] Write full details to debug file

   Associated qualifiers:

   "-indexdir" associated qualifiers
   -extension          string     Default file extension

   "-outfile" associated qualifiers
   -odirectory         string     Output directory

   General qualifiers:
   -auto               boolean    Turn off prompts
   -stdout             boolean    Write first file to standard output
   -filter             boolean    Read first file from standard input, write
                                  first file to standard output
   -options            boolean    Prompt for standard and additional values
   -debug              boolean    Write debug output to program.dbg
   -verbose            boolean    Report some/full command line options
   -help               boolean    Report command line options and exit. More
                                  information on associated and general
                                  qualifiers can be found with -help -verbose
   -warning            boolean    Report warnings
   -error              boolean    Report errors
   -fatal              boolean    Report fatal errors
   -die                boolean    Report dying program messages
   -version            boolean    Report version number and exit

Index 'id' (.xid)
  compressed:  Yes (Compressed)
   cachesize: 20000 (Size of primary cache)
seccachesize: 20000 (Size of secondary cache)
    pagesize: 2048 (Page size)
 secpagesize:  512 (Secondary page size)
   pagecount:    3 (Primary page count)
   pagecount:    0 (Secondary page count)
    refcount:    0 (Number of reference files)
       order:   71 (Tree order)
      sorder:   22 (Order of secondary tree)
       level:    0 (Level of tree)
      slevel:    0 (Level of secondary tree)
        fill:   56 (Entries per bucket)
       sfill:   41 (Entries per secondary bucket)
    keylimit:   15 (Max key size)
     idlimit:    0 (Max secondary id size)
       count:    6 (Unique entries in index)
   fullcount:    6 (Total entries in index)
Identifier index 'id' index found with 3 pages
      COUNT: 6
   COUNTALL: 6
       root: 1
     bucket: 2
...       keys: 1
...      bkeys: 6
...   total_size: 6144
...    freespace: 5871, 95.6% of uncompressed 6144
      FOUND: 6
   FOUNDALL: 6
Index 'acc' (.xac)
  compressed:  Yes (Compressed)
   cachesize: 20000 (Size of primary cache)
seccachesize: 20000 (Size of secondary cache)
    pagesize: 2048 (Page size)
 secpagesize:  512 (Secondary page size)
   pagecount:    3 (Primary page count)
   pagecount:    3 (Secondary page count)
    refcount:    0 (Number of reference files)
       order:   71 (Tree order)
      sorder:   22 (Order of secondary tree)
       level:    0 (Level of tree)
      slevel:    0 (Level of secondary tree)
        fill:   56 (Entries per bucket)
       sfill:   41 (Entries per secondary bucket)
    keylimit:   15 (Max key size)
     idlimit:    0 (Max secondary id size)
       count:    7 (Unique entries in index)
   fullcount:    9 (Total entries in index)
Identifier index 'acc' index found with 6 pages
      COUNT: 7
   COUNTALL: 9
       root: 1
    numroot: 1
     bucket: 2
  numbucket: 2
...       keys: 2
...      bkeys: 7
...      bdups: 1
...      bxtra: 2
...      nkeys: 3 (0)
...   total_size: 7680
...    freespace: 7236, 94.2% of uncompressed 7680
      FOUND: 7
   FOUNDALL: 9