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newbie question for openldap tuning issue

Hi group,

I have a server with dual xeon 2 GB Ram (Linux OS). Earlier I was
runing openldap 2.0.x after which I migrated to 2.3.4. It has been
running fine until recetly it started giving problems. All of a sudden
all lookup fail and I have to restart all the services.

here is my slapd config file.
[root@host]# grep -v '^#' slapd.conf | grep -v '^$'
---------------------------
include         /usr/local/etc/openldap/schema/core.schema
include         /usr/local/etc/openldap/schema/cosine.schema
include         /usr/local/etc/openldap/schema/inetorgperson.schema
include         /usr/local/etc/openldap/schema/nis.schema
include         /usr/local/etc/openldap/schema/qmail.schema
include         /etc/openldap/schema/LDAP.schema
pidfile         /usr/local/var/run/slapd.pid
argsfile        /usr/local/var/run/slapd.args
allow bind_v2
sizelimit 3000
loglevel 0
database        bdb
suffix          "o=domain,c=in"
rootdn          "cn=Manager,o=domain,c=in"
cachesize     5000
checkpoint      1024    5
rootpw          password
directory       /usr/local/var/openldap-data
index   objectClass     eq
index   mailAlternateAddress pres,eq
index   cn              pres,eq
index   mail            pres,eq
index   uid            pres,eq
index  mailQuotaSize,mailForwardingAddress,accountStatus,mailHost,deliveryMode
      pres,eq
database monitor
 access to dn.subtree="cn=Monitor"
        by dn.exact="cn=Manager,o=domain,c=in" write
        by users read
        by * none
---------------------------
my DB_CONFIG file in /usr/local/var/openldap-data/ dir
[root@host ]# grep -v '^#' DB_CONFIG | grep -v '^$'
----------------------------------
set_cachesize 0 72428800  0
set_lg_regionmax 1048576
set_lg_max       10485760
set_lg_bsize 2097152
set_lg_dir       /var/lib/ldap/logs
-----------------------------------
db_stat details:
---------------------------------------
[root@host]# export LD_LIBRARY_PATH=/usr/local/BerkeleyDB.4.3/lib
[root@host]# /usr/local/BerkeleyDB.4.3/bin/db_stat -h
/usr/local/var/openldap-data/ -m
86MB 354KB 112B Total cache size
1       Number of caches
86MB 360KB      Pool individual cache size
0       Maximum memory-mapped file size
0       Maximum open file descriptors
0       Maximum sequential buffer writes
0       Sleep after writing maximum sequential buffers
0       Requested pages mapped into the process' address space
1513070 Requested pages found in the cache (99%)
586     Requested pages not found in the cache
2       Pages created in the cache
586     Pages read into the cache
200     Pages written from the cache to the backing file
0       Clean pages forced from the cache
0       Dirty pages forced from the cache
0       Dirty pages written by trickle-sync thread
588     Current total page count
588     Current clean page count
0       Current dirty page count
16381   Number of hash buckets used for page location
1514243 Total number of times hash chains searched for a page
1       The longest hash chain searched for a page
1513069 Total number of hash buckets examined for page location
0       The number of hash bucket locks that required waiting (0%)
0       The maximum number of times any hash bucket lock was waited for
1       The number of region locks that required waiting (0%)
636     The number of page allocations
0       The number of hash buckets examined during allocations
0       The maximum number of hash buckets examined for an allocation
0       The number of pages examined during allocations
0       The max number of pages examined for an allocation
Pool File: mailForwardingAddress.bdb
4096    Page size
0       Requested pages mapped into the process' address space
7119    Requested pages found in the cache (99%)
5       Requested pages not found in the cache
0       Pages created in the cache
5       Pages read into the cache
0       Pages written from the cache to the backing file
Pool File: accountStatus.bdb
4096    Page size
0       Requested pages mapped into the process' address space
55589   Requested pages found in the cache (99%)
14      Requested pages not found in the cache
0       Pages created in the cache
14      Pages read into the cache
8       Pages written from the cache to the backing file
Pool File: deliveryMode.bdb
4096    Page size
0       Requested pages mapped into the process' address space
46049   Requested pages found in the cache (99%)
14      Requested pages not found in the cache
0       Pages created in the cache
14      Pages read into the cache
12      Pages written from the cache to the backing file
Pool File: mailQuotaSize.bdb
4096    Page size
0       Requested pages mapped into the process' address space
54784   Requested pages found in the cache (99%)
17      Requested pages not found in the cache
0       Pages created in the cache
17      Pages read into the cache
6       Pages written from the cache to the backing file
Pool File: mailHost.bdb
4096    Page size
0       Requested pages mapped into the process' address space
32617   Requested pages found in the cache (99%)
10      Requested pages not found in the cache
0       Pages created in the cache
10      Pages read into the cache
8       Pages written from the cache to the backing file
Pool File: cn.bdb
4096    Page size
0       Requested pages mapped into the process' address space
75267   Requested pages found in the cache (99%)
27      Requested pages not found in the cache
0       Pages created in the cache
27      Pages read into the cache
7       Pages written from the cache to the backing file
Pool File: id2entry.bdb
16384   Page size
0       Requested pages mapped into the process' address space
7701    Requested pages found in the cache (96%)
258     Requested pages not found in the cache
1       Pages created in the cache
258     Pages read into the cache
13      Pages written from the cache to the backing file
Pool File: dn2id.bdb
4096    Page size
0       Requested pages mapped into the process' address space
321056  Requested pages found in the cache (99%)
95      Requested pages not found in the cache
1       Pages created in the cache
95      Pages read into the cache
19      Pages written from the cache to the backing file
Pool File: objectClass.bdb
4096    Page size
0       Requested pages mapped into the process' address space
624425  Requested pages found in the cache (99%)
62      Requested pages not found in the cache
0       Pages created in the cache
62      Pages read into the cache
24      Pages written from the cache to the backing file
Pool File: mail.bdb
4096    Page size
0       Requested pages mapped into the process' address space
105670  Requested pages found in the cache (99%)
25      Requested pages not found in the cache
0       Pages created in the cache
25      Pages read into the cache
7       Pages written from the cache to the backing file
Pool File: mailAlternateAddress.bdb
4096    Page size
0       Requested pages mapped into the process' address space
92298   Requested pages found in the cache (99%)
36      Requested pages not found in the cache
0       Pages created in the cache
36      Pages read into the cache
89      Pages written from the cache to the backing file
Pool File: uid.bdb
4096    Page size
0       Requested pages mapped into the process' address space
90495   Requested pages found in the cache (99%)
23      Requested pages not found in the cache
0       Pages created in the cache
23      Pages read into the cache
7       Pages written from the cache to the backing file
----------------------------------------
I don't know from where to start debugging, so please help.
If any more info has to be provided please let me known

Thanx Regards
Ramdas