Description of problem:
Question from Community:
I found a file called dbtest.c in fds source code.
The actual purpose the file written is - “ldbm database test program”. (from the comment inside file)

The function dbtest_help() inside the dbtest.c clearly shows some command line help messages such as

i => traverse index keys and ID list values" 
t => traverse index keys and values" ;
T => traverse index keys";
u => traverse id2entry keys and values" ;
U => traverse id2entry keys";
l<c> => lookup index";
L<c> => lookup index (all)";
t<c> => traverse index keys… etc,

But I could not find any specific tool which uses the functions which exists inside dbtest.c. I tried using all the available tools in FDS I didn’t find any tool which invokes this dbtest_help () function.

Other than dbverify, dbscan, is there really any testing tool available for database testing OR 
This file is in the source code as an intention of using it in future FDS releases.

Can somebody clarify my doubt?
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1) Stop the server
2) Run the command line.  Then, I put "i" to dbtest, then "sn" to attr:
# /usr/sbin/ns-slapd dbtest -D /etc/dirsrv/slapd-your_instance_name -n userRoot
ldbm database test mode

index key prefixes:
          +  presence      (sn=*)
          =  equality      (sn=jensen)
          ~  approximate   (sn~=jensin)
          *  substring     (sn=jen*)
          :  matching rule (sn:1.2.3.4.5:=Jensen)
          \  continuation

commands: i => traverse index keys and ID list values
          t => traverse index keys and values
          T => traverse index keys
          u => traverse id2entry keys and values
          U => traverse id2entry keys
dbtest: i
 attr: sn
        key: * al
        data: Regular block (count=60, max=1202)
                id: 18482912
                id: 0
                id: 32
                id: 0
                id: 49
                id: 0
                id: 18891783

But it eventually crashed on my test machine.

[Stacktrace]
Program received signal SIGSEGV, Segmentation fault.
0x00007f3143fc42c5 in dbtest_print_idlist (keystr=0x179b1c0 "* an", 
    p=0x17acf20, size=4, outfp=0x3c1cb66780)
    at ldap/servers/slapd/back-ldbm/dbtest.c:280
280			for ( i = 0; idl->b_ids[i] != NOID; ++i ) {
(gdb) bt
#0  0x00007f3143fc42c5 in dbtest_print_idlist (keystr=0x179b1c0 "* an", 
    p=0x17acf20, size=4, outfp=0x3c1cb66780)
    at ldap/servers/slapd/back-ldbm/dbtest.c:280
#1  0x00007f3143fc4167 in dbtest_traverse (db=0x17a1930, 
    filename=0x7fff4dcc8510 "sn", options=13, outfp=0x3c1cb66780)
    at ldap/servers/slapd/back-ldbm/dbtest.c:254
#2  0x00007f3143fc3e35 in ldbm_back_db_test (pb=0x7fff4dcc8630)
    at ldap/servers/slapd/back-ldbm/dbtest.c:147
#3  0x0000000000420c99 in slapd_exemode_dbtest ()
    at ldap/servers/slapd/main.c:2748
#4  0x000000000041d1ac in main (argc=6, argv=0x7fff4dcc8cc8)
    at ldap/servers/slapd/main.c:951
(gdb) p i
$1 = 128054
(gdb) p idl->b_ids[i]
Cannot access memory at address 0x182a000