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i'm new to Berkeley db, i have installed the version "db-4.8.30.NC.tar.gz" but now i would like to find the configuration information by using the configuration file.

I've read in the documentations that this file is named DB_CONFIG and it exists in the database home directory.

In my system, i have uzipped the tar file under /usr/db-4.8.30.NC but i still haven't found the DB_CONFIG file.

Well, i'm trying to find where the DB_CONFIG file is located in Unix, but i can't find it.

May you please help me?

Thanks, in advance

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  • Voting to close, you should ask this on unix.stackexchange.com Commented Dec 4, 2011 at 9:24
  • @mghie: It sounds to me like programmer is trying to program an application using Berkeley DB. Commented Dec 4, 2011 at 9:55

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You (or a system administrator) writes the DB_CONFIG file by hand to modify any of the DB_ENV environment variables that can be over-ridden at runtime.

The DB_CONFIG file is stored in the db_home directory; the docs/programmer_reference/env_naming.html file has full details, but you can either pass an explicit db_home parameter in the DB_ENV->open() call or rely on the DB_HOME environment variable to locate the DB_CONFIG file, if any exists. The environment variable approach might be nice if the system administrator would reasonably want to move the storage around as they wish; the specific path name approach might be nice if you don't want to bother your system administrators with details of managing your storage.

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Thanks for replying.When you say "you can either pass an explicit db_home parameter in the DB_ENV->open() call or rely on the DB_HOME environment variable to locate the DB_CONFIG file, if any exists". Where can i locate the db_home parameter (in which dir?) or how can i rely on the DB_HOME environment in order to locate the DB_CONFIG file?Shall i open a file and find these information? I'm sorry for making these questions but i'm a new user of Berkeley and i'm confused.
It really depends upon your application. You might construct the db_env parameter to DB_ENV->open() by concatenating getenv("HOME") with ".foo/". Or, if your application runs as a dedicated user, perhaps just pass getenv("HOME"). (Similar to squid, apache, ftpd, etc. using the home directory set for their dedicated user in /etc/passwd. Maybe you provide an Upstart configuration file for your users where you could set the DB_HOME environment variable.
Let's say that i would like to open the DB_CONFIG file. How can i open it?
vim /path/to/my/applications/data/directory/DB_CONFIG.
I can't understand the path. Isn't the DB_CONFIG file in the directory /usr/db-4.8.30.NC? Cause i don't know where the path you wrote me is. I'm sorry for asking these questions but i'm trying to find out how the system is organised. Also, i tried to type some commandes under the /usr/db-4.8.30.NC directory. e.g. dbenv->repmgr_set_ack_policy(dbenv, DB_REPMGR_ACKS_ONE); and i take the output "-bash: syntax error near unexpected token `('". Am i doing something wrong?
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