Hello,

I tried to create a single file containing many databases.
Creating environnement then handle works well but opening the
database gives me an EINVAL error.

The documentation say that I must set up many things:

-locking
-pool
-page size
-encryption and checksum
-byte order
etc...


Could you tell me how to setu up the environnement and what
customizations
are realy required to build multiple database in a single files.

Thank you

------------------
OS: Linux slackware

intmail01 (AT) gmail (DOT) com writes:

Your code is probably giving some bad parameter to the open call.
Maybe we could guess what, if you would show us the relevant code.

I open my environment with these flags:

DB_INIT_MPOOL | DB_INIT_LOG | DB_INIT_LOCK | DB_INIT_TXN | DB_CREATE

Then I create a transaction tx, create the database handles dbA and dbB,
with no special flags, and open the databases like this:

dberr = dbA->open(dbA, tx, "filename", "dbA", DB_BTREE, DB_CREATE, 0644);
dberr = dbB->open(dbB, tx, "filename", "dbB", DB_BTREE, DB_CREATE, 0644);

Never failed me.

best regards
Patrick

to Patrick Schaaf

When I open an env. I just use DB_CREATE flags.
I did not use transaction. Could you tell me more about tx ?

What home path have you created when you open env ? for me I set it
"." (point)

Intmail01

intmail01 (AT) gmail (DOT) com writes:

I don't know what happens with such usage.

I set it to "db", but "." should be a directory just as valid.

Unfortunately, due to time constrains, your request for explaining about tx
cannot be met. May I suggest you study the relevant documentation that
comes with Berkeley DB? It is much much better than anybody could be
in a Usenet posting.

best regards
Patrick

The things I want to know is it realy important to use transaction ?

intmail01 (AT) gmail (DOT) com writes:

Sometimes it is, and sometimes it isn't. There is no one answer.
It there were one answer, transactions would probably not be optional.

best regards
Patrick