Can't run db_stat

Question

A new version of our web site uses Berkeley DB with an environment and CDB mode, under FreeBSD 6.3.
Our mod_perl2 code accesses the system via the BerkeleyDB (no space) interface module.
It seems to be working but we haven't pushed it very hard yet.
First I wanted to instrument the thing a bit, which is to say, provide a status reporting mechanism.
I sent an email to the author of BerkeleyDB (no space) about whether I can get to
the DbEnV::memp_stat function via his interface.
In the meanwhile I tried the db_stat utility. It's not in my standard path, but find yielded 3 of them:
$ sudo find /usr/local -name db_stat -print
/usr/local/bin/db47/db_stat
/usr/local/bin/db42/db_stat
/usr/local/BerkeleyDB/bin/db_stat
The last one sounded like the best bet, so I tried it:
$ /usr/local/BerkeleyDB/bin/db_stat -e -h /home/yarboro/var/db/web
db_stat: DB_ENV->open: /home/yarboro/var/db/web: Permission denied
$ ll /home/yarboro/var/db/web
total 836
-rw-rw-r-- 1 yarboro www 24576 Feb 15 12:09 GBook.db
-rw-r--r-- 1 www yarboro 24576 Feb 18 20:39 __db.001
-rw-r--r-- 1 www yarboro 65536 Feb 19 01:23 __db.002
-rw-r--r-- 1 www yarboro 1318912 Feb 19 01:23 __db.003
-rw-r--r-- 1 www yarboro 499712 Feb 19 01:23 __db.004
-rw-r--r-- 1 yarboro www 12288 Feb 15 12:09 animals.db
<snip>
This is not a good sign for my future intent to run programs from
the command line that join the environment and modify the DBs.
Why should db_stat want write permission on the __db files?
Oh well I can chmod them in the server routine that creates them
(it runs as user 'www').
I escalate to sudo and get a scarier complaint:
sakomina:~ $ sudo /usr/local/BerkeleyDB/bin/db_stat -e -h /home/yarboro/var/db/web
db_stat: Build signature doesn't match environment
db_stat: DB_ENV->open: DB_VERSION_MISMATCH: Database environment version mismatch
Maybe one of the others is the version that BerkeleyDB (no space) is linked with?
sakomina:~ $ sudo /usr/local/bin/db47/db_stat -e -h /home/yarboro/var/db/web
db_stat: Build signature doesn't match environment
db_stat: DB_ENV->open: DB_VERSION_MISMATCH: Database environment version mismatch
sakomina:~ $ sudo /usr/local/bin/db42/db_stat -e -h /home/yarboro/var/db/web
db_stat: Program version 4.2 doesn't match environment version
db_stat: DB_ENV->open: /home/yarboro/var/db/web: Invalid argument
Does this mean that there is yet a fourth copy of Berkeley DB
around somewhere, that BerkeleyDB (no space) is linked to?
If so, it doesn't seem to have an accompanying db_stat.
Anything anyone can suggest will be much appreciated,
craig
www.animalhead.com

Answer 1

$ /usr/local/BerkeleyDB/bin/db_stat -V
Berkeley DB 4.7.25: (May 15, 2008)
$ /usr/local/bin/db42/db_stat -V
Sleepycat Software: Berkeley DB 4.2.52: (December 3, 2003)
$ /usr/local/bin/db47/db_stat -V
Berkeley DB 4.7.25: (May 15, 2008)
$ perl -e 'use BerkeleyDB; print $BerkeleyDB::db_version, "\n";'
4.7
The BerkeleyDB (no space) interface suppresses the 3rd part of
$db_version. The author of BerkeleyDB suggested I try the following
to get the whole version:
$ perl -e 'use BerkeleyDB; print BerkeleyDB::DB_VERSION_STRING."\n"'
Berkeley DB 4.7.25: (May 15, 2008)
SO NOW we have the exact same version string from the version that the
BerkeleyDB interface is linked with, as from two versions of db_stat.
Yet both db_stats say
db_stat: Build signature doesn't match environment
db_stat: DB_ENV->open: DB_VERSION_MISMATCH: Database environment version mismatch
PLEASE consult your DB experts as to what could cause such behavior.
The standard directory for BerkeleyDB to link to is /usr/local/BerkeleyDB/.
This is from its 'config.in' file on CPAN. I installed BerkeleyDB several months
ago and don't recall the details...
Edited by: [email protected] on Feb 25, 2009 9:45 AM