Berkeley db lost data when using autocommit

Question

I has written an app which uses berkeley db 4.5.20(libdb_cxx-4.5.so). There are serveral threads reading and writing the same db using autocommit. All the reading threads share one db handle and All writing threads have their own db handles. In reading threads, cursor and explicit transaction are used to retrieve data. In write thread, the db->put method is used to write data. In the app, the return value of put is checked to see whether success.
After serveral days running, the app definitely lost some data(there is a thread to dump the imcomming data to disk for comparison), and the return value of put method seems all ok. Can someone point out the possible reason or how to debug this from log files or something else?
The DBENV is opened with flags,
DB_INIT_TXN | DB_INIT_MPOOL |
DB_INIT_LOCK | DB_INIT_LOG |
DB_CREATE | DB_RECOVER |
DB_THREAD
The DB handle is opened with flags, DB_CREATE | DB_AUTO_COMMIT | DB_THREAD
thanks
Edited by: user13262865 on 2010-8-19 下午10:20
Edited by: user13262865 on 2010-8-19 下午10:28

Answer 1

Hi,
Thanks for your reply. Actually i got no hint from the link :). Today, i found the db->put method throw DB_RUNRECOVERY exception when a check point thread is on-going after the app runs about ten days. The check point thread stack is as follows,
Thread 12 (Thread 26744):
#0 0x000000368accc5f2 in select () from /lib64/libc.so.6
#1 0x00002b367aa29043 in __os_sleep ()
from /usr/local/BerkeleyDB.4.5/lib/libdb_cxx-4.5.so
#2 0x00002b367aa24090 in __memp_sync_int ()
from /usr/local/BerkeleyDB.4.5/lib/libdb_cxx-4.5.so
#3 0x00002b367aa2470e in __memp_sync ()
from /usr/local/BerkeleyDB.4.5/lib/libdb_cxx-4.5.so
#4 0x00002b367aa316aa in __txn_checkpoint ()
from /usr/local/BerkeleyDB.4.5/lib/libdb_cxx-4.5.so
#5 0x00002b367aa319f1 in __txn_checkpoint_pp ()
from /usr/local/BerkeleyDB.4.5/lib/libdb_cxx-4.5.so
#6 0x00002b367a965257 in DbEnv::txn_checkpoint(unsigned int, unsigned int, unsigne
d int) () from /usr/local/BerkeleyDB.4.5/lib/libdb_cxx-4.5.so
#7 0x0000000000437e1f in DBEnv::checkPoint (this=0x676ae0)
at ../source/DBEnv.cpp:46
#8 0x000000000043e436 in thread_check_point (arg=0x7fffcce2b6b0)
at ../source/ChkPointer.cpp:43
#9 0x000000368b806367 in start_thread () from /lib64/libpthread.so.0
#10 0x000000368acd30ad in clone () from /lib64/libc.so.6
My Berkeley version is db-4.5.20.NC
Edited by: user13262865 on 2010-8-31 上午4:50
Edited by: user13262865 on 2010-8-31 上午4:51