Has the status of back_sql as a valid syncrepl provider changed since this conversation:
I have a back_sql producer that I want to query and populate/synchronize to a back_hdb consumer. ÂFrom the 2009 email exchange, it sounds as though it is impossible or unsupported, though some emails from 2004 made it sound as though its feasible.
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# My SQL Producer
database null
suffix "cn=admin"
rootdn "cn=admin"
rootpw password
#Clone of SQL entries for verifying syncrepl configuration
#database hdb
#suffix "ou=virtual"
#rootdn "cn=admin"
#directory /var/lib/ldap/virtual
database sql
lastmod on
readonly on
suffix "ou=virtual"
dbname dbname
dbuser dbuser
upper_func UPPER
use_subtree_shortcut Âyes
children_cond  Â"ldap_entries.dn=UPPER(?)"
subtree_cond   "UPPER(ldap_entries.dn) LIKE UPPER(CONCAT('%',?))"
has_ldapinfo_dn_ru Âno
overlay syncprov
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# My HDB Consumer
database null
suffix "cn=admin"
rootdn "cn=admin"
rootpw password
database hdb
rootdn "cn=admin"
directory /var/lib/ldap
syncrepl rid=123
    provider=ldaps://localhost:636
    type=refreshOnly
    interval=00:00:05:00
    searchbase="ou=virtual"
    schemachecking=off
    bindmethod=simple
    binddn="cn=admin"
    credentials=password
    tls_cacertdir=/etc/pki/cacerts
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# Producer logging from -d 16384
syncprov_search_response: cookie=rid=123,csn=20130724213107.411609Z#000000#000#000000
slap_queue_csn: queing 0x7fe7fbffcb70 20130724213725.653540Z#000000#000#000000
slap_graduate_commit_csn: removing 0x7fe7f4168ef0 20130724213725.653540Z#000000#000#000000
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# Consumer logging from -d 16384
do_syncrep2: rid=123 LDAP_RES_SEARCH_RESULT
do_syncrep2: rid=123 cookie=rid=123,csn=20130724213107.411609Z#000000#000#000000
slap_queue_csn: queing 0x7fba781ae900 20130724213107.411609Z#000000#000#000000
slap_graduate_commit_csn: removing 0x7fba781ae880 20130724213107.411609Z#000000#000#000000
syncrepl_updateCookie: rid=123 be_modify failed (32)