Re: mdb_dbi_open and threads

To: Klaus Malorny <Klaus.Malorny@knipp.de>

Subject: Re: mdb_dbi_open and threads

From: Muhammed Muneer <elendilm@gmail.com>

Date: Mon, 19 Jun 2017 20:22:14 +0530

Cc: Howard Chu <hyc@symas.com>, openldap-technical@openldap.org, Hallvard Breien Furuseth <h.b.furuseth@usit.uio.no>

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In-reply-to: <2c181331-fa75-288c-5d59-cc6c66ab6f05@knipp.de>

References: <CAMvTE2PoED94-ZiGjCHt+akiYSjqQvFqkYe3Z7DHdkGdcwdSQA@mail.gmail.com> <450e4835-9c54-0c5c-29cd-ab081eee8bd0@symas.com> <CAMvTE2N2k-O-_f-u-ChdBv+BZmkkidqUMsp4pp9PmcWRSOaCiA@mail.gmail.com> <CAMvTE2MjUBZ0YdzYxXVUnDGuawicuUDH3Y4Vy-pt3PidFgxrXg@mail.gmail.com> <4ee53713-f261-7efe-97cb-66e834f0f86b@knipp.de> <CAMvTE2OdV_MxeH=F1NfTjSOXe48zow330v4e1c185yvVedeREg@mail.gmail.com> <WM!fca24ec35fb2ea6029fe6df0c81746209810835b76c57bfceee80ab2ef6796789549c5df115c82370b14612c57e1d98e!@mailstronghold-1.zmailcloud.com> <611b7680-366a-6ad6-3b6f-47922bf88940@symas.com> <f7441608-0c22-6ebd-5c85-dde1ead68fdd@usit.uio.no> <WM!233e16a5e3ba4174ba4546004358dfbbf29cec9059486b9a0982c3561a2342529c272b5c17bbce035ad5074ff377f5a3!@mailstronghold-3.zmailcloud.com> <8db837aa-51bf-39af-1217-55d69cc20099@symas.com> <CAMvTE2PFDczxGFTVCpZHgjYWDGtoRu=jYaEtxYy3PwZbwg5Z7w@mail.gmail.com> <2c181331-fa75-288c-5d59-cc6c66ab6f05@knipp.de>

I know. But that is not my problem.

On Mon, Jun 19, 2017 at 2:31 PM, Klaus Malorny <Klaus.Malorny@knipp.de> wrote:

On 6/19/17 10:31 AM, Muhammed Muneer wrote:

Sorry for the late reply, I was on vacation.

Klaus wrote:
"I am still unsure what you are trying to achieve. If you are in a read transaction and discover that your database does not exist, what can you do anyway? You cannot create the database at this point, since it is a write operation."

When I discover a dbi does not exist in a read transaction, I can assume it to be the same as a dbi which is empty and create it when and only when there is a write-request into that dbi later.

To my understanding, the API does not prevent you from doing so. As long as you do not specify the MDB_CREATE flag, you can call mdb_dbi_open and will get informed whether the database exists or not (MDB_NOTFOUND).

Klaus

References:

Re: mdb_dbi_open and threads
- From: Muhammed Muneer <elendilm@gmail.com>
Re: mdb_dbi_open and threads
- From: Klaus Malorny <Klaus.Malorny@knipp.de>