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This bug is created as a clone of upstream ticket:
https://fedorahosted.org/389/ticket/48383

db2index currently allocates a buffer as a derivative of cachememsize.

This value should be independent for the index process and documented clearly, so that server re-tuning isn't needed just to run db2index.

See  ./ldap/servers/slapd/back-ldbm/import.c:48:    job->fifo.bsize = (inst->inst_cache.c_maxsize/10) << 3;

Build tested:
389-ds-base-1.3.5.10-3.el7.x86_64

=========================== test session starts ===========================
platform linux2 -- Python 2.7.5, pytest-2.9.2, py-1.4.31, pluggy-0.3.1 -- /usr/bin/python
cachedir: dirsrvtests/tests/tickets/.cache
rootdir: /mnt/tests/rhds/tests/upstream/ds/dirsrvtests/tests/tickets, inifile:
plugins: html-1.9.0, cov-2.3.0
collected 1 items

dirsrvtests/tests/tickets/ticket48383_test.py::test_ticket48383 PASSED

======================== 1 passed in 74.67 seconds ========================

Marking as verified.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2016-2594.html