OK, per https://bbs.archlinux.org/viewtopic.php?id=84077 and then http://dbaspot.com/forums/berkeley-db/265933-how-upgrade-4-2-4-3-a.html, I installed db4.7-utils and ran
cd /var/lib cp -a ldap ldap.bak cd ldap db4.7_checkpoint -1 db4.7_recover
After that, slapd started normally.
OK, per https:/ /bbs.archlinux. org/viewtopic. php?id= 84077 and then http:// dbaspot. com/forums/ berkeley- db/265933- how-upgrade- 4-2-4-3- a.html, I installed db4.7-utils and ran
cd /var/lib
cp -a ldap ldap.bak
cd ldap
db4.7_checkpoint -1
db4.7_recover
After that, slapd started normally.