strange message in the cyrus log

[Eric Doutreleau]

i m using cyrus2.3.6 in an RHEL box and this evening i saw the folowing 
message in the cyrus log files

Dec  6 18:49:44 pasargades lmtp[18170]: skiplist: checkpointed 
/var/lib/imap/deliver.db (1381 records, 126228 bytes) in 8 seconds
Dec  6 18:49:49 pasargades lmtp[18166]: skiplist: recovered 
/var/lib/imap/deliver.db (1381 records, 126228 bytes) in 5 seconds
Dec  6 18:49:57 pasargades lmtp[18169]: skiplist: checkpointed 
/var/lib/imap/deliver.db (1394 records, 127436 bytes) in 8 seconds
Dec  6 18:50:02 pasargades lmtp[18673]: skiplist: recovered 
/var/lib/imap/deliver.db (1394 records, 127436 bytes) in 5 seconds
Dec  6 18:50:13 pasargades lmtp[18167]: skiplist: checkpointed 
/var/lib/imap/deliver.db (1441 records, 131392 bytes) in 10 seconds
Dec  6 18:50:18 pasargades lmtp[18169]: skiplist: recovered 
/var/lib/imap/deliver.db (1441 records, 131392 bytes) in 5 seconds
Dec  6 18:51:13 pasargades lmtp[18666]: skiplist: checkpointed 
/var/lib/imap/deliver.db (2876 records, 263196 bytes) in 13 seconds
Dec  6 18:51:22 pasargades lmtp[18673]: skiplist: recovered 
/var/lib/imap/deliver.db (2876 records, 263196 bytes) in 9 seconds
Dec  6 18:51:36 pasargades lmtp[18170]: skiplist: checkpointed 
/var/lib/imap/deliver.db (2945 records, 270112 bytes) in 12 seconds
Dec  6 18:51:45 pasargades lmtp[18169]: skiplist: recovered 
/var/lib/imap/deliver.db (2945 records, 270112 bytes) in 9 seconds
Dec  6 18:52:03 pasargades lmtp[18167]: skiplist: checkpointed 
/var/lib/imap/deliver.db (3050 records, 279660 bytes) in 16 seconds
Dec  6 18:52:13 pasargades lmtp[18673]: skiplist: recovered 
/var/lib/imap/deliver.db (3050 records, 279660 bytes) in 10 seconds
Dec  6 18:53:59 pasargades lmtp[18666]: skiplist: checkpointed 
/var/lib/imap/deliver.db (5741 records, 532436 bytes) in 29 seconds
Dec  6 18:54:14 pasargades lmtp[18673]: skiplist: recovered 
/var/lib/imap/deliver.db (5741 records, 532436 bytes) in 15 seconds
Dec  6 18:54:51 pasargades lmtp[18170]: skiplist: checkpointed 
/var/lib/imap/deliver.db (5992 records, 556372 bytes) in 27 seconds
Dec  6 18:55:08 pasargades lmtp[18169]: skiplist: recovered 
/var/lib/imap/deliver.db (5992 records, 556372 bytes) in 17 seconds
Dec  6 18:55:45 pasargades lmtp[19599]: skiplist: checkpointed 
/var/lib/imap/deliver.db (6253 records, 580284 bytes) in 32 seconds
Dec  6 18:56:05 pasargades lmtp[18169]: skiplist: recovered 
/var/lib/imap/deliver.db (6253 records, 580284 bytes) in 20 seconds
Dec  6 18:56:33 pasargades lmtp[19182]: skiplist: checkpointed 
/var/lib/imap/deliver.db (6284 records, 583028 bytes) in 28 seconds
Dec  6 18:56:53 pasargades lmtp[19599]: skiplist: recovered 
/var/lib/imap/deliver.db (6284 records, 583028 bytes) in 20 seconds

as you can see there s a lot of checkpoint and recovery of the 
deliverd.db database
i can see during these operation a deliver.db file and a deliver.db.NEW 
file.

the problem is that during this operation the delivery of mail is stopped.

Should i upgrade to 2.3.7 version and has anybody have alrady that problem?

thanks in advance for any help