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Re: Repairing a lmdb database

Tim Uckun wrote:

The language is Crystal which is still a very young language. It does not have
threading at this time so there should be no issues with mutexes. While
writing the code I never opened up a database but did repeatedly open up the
environment and if the app ran into an error while coding didn't properly
close the environment.


I didn't ask about languages, I asked about OS and LMDB version.

LMDB uses mutexes internally to serialize write transactions.


Howard while I have you on the line....

The documentation says to be very careful about closing databases and says
it's not normally necessary. I am going to omit those calls from my wrapper.
Is this OK?  I will probably omit a bunch of other calls too at least from the
first release but I want to make sure I don't omit anything crucial.


Probably a good idea to omit dbi_close.


Thanks.

On Tue, Nov 22, 2016 at 7:42 AM, Howard Chu <hyc@symas.com
<mailto:hyc@symas.com>> wrote:

    Tim Uckun wrote:

        Hi All.

        I am writing a wrapper for Lmdb for the Crystal language.  During the
        process
        of writing my code started hanging when attempting to open a
        transaction.  At
        first I thought I was calling the C functions wrong but it turned out
        to be
        some sort of a corruption in the database itself. I deleted the database
        directory and the code started working fine again.


    Sounds like you're not using robust mutexes. Just a guess, since you
    didn't provide any info about your OS / platform or LMDB version.

    --
      -- Howard Chu
      CTO, Symas Corp.           http://www.symas.com
      Director, Highland Sun     http://highlandsun.com/hyc/
      Chief Architect, OpenLDAP  http://www.openldap.org/project/
    <http://www.openldap.org/project/>





--
  -- Howard Chu
  CTO, Symas Corp.           http://www.symas.com
  Director, Highland Sun     http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP  http://www.openldap.org/project/