The Directory Server now automatically generates an Index Summary Statistics
Table, which can be used to determine the optimal configuration for your system's indexes. This
table is only generated when the rebuild-index
tool is run in offline mode. The
table is generated after any LDIF import or an index rebuild, and is written to system out and to
logs/tools/rebuild-index-summary.txt. The table lists the current index
entry limit (set by the index-entry-limit
property on the local DB
configuration), the number of keys whose entry count exceeds this limit if any, and the maximum
entry count for any key in the index. The table then displays a histogram of the number of keys
whose entry falls within a range of values. An example of the Index Summary Statistics table is
show below for the sn.equality
and the sn.substring
indexes.
The following figure shows that there are seven substrings whose entry counts exceed the
index-entry-limit
of 4000. Six of the substrings are in the 10000-99999 range
with the maximum entry count being 13419. By deduction, one more substring must be present in the
1000-9999 range that exceeds the index-entry-limit
of 4000. These substrings
could be expensive for search operations.