Re: Page Leak?

Andrew Spott wrote:

When looking at the code for mdb_env_copyfd1 (the copy with compaction function), there is this clause[0]:

if (rc == MDB_SUCCESS && root != new_root) {     rc = MDB_INCOMPATIBLE; /* page leak or corrupt DB */  }

Since this happens at the end of the function, and I'm seeing the mdb_copy -c takes a while, I figured this was the error that I was seeing.

If this isn't it, then what am I looking at?  If it is a corrupt DB, is there anything I can do to figure out how to fix this?

Try using mdb_dump to get a backup instead, see if it succeeds or complains.

[0] https://github.com/LMDB/lmdb/blob/c3e6b4209eed13af4a3670e5f04f42169c08e5c6/l...

-Andrew

On Sat, Nov 16, 2019 at 7:24 AM Howard Chu <hyc@symas.com mailto:hyc@symas.com> wrote:

Andrew Spott wrote:
> I apologize if this is the wrong place to ask this, let me know if there is someplace better.
>
> So, when doing a `mdb_copy -c`, I've run into the error message:
>
> mdb_copy: copying failed, error -30784 (MDB_INCOMPATIBLE: Operation and DB incompatible, or DB flags changed)
>
> When looking at the mdb_copy man page, it says that mdb_copy with compaction might fail if the database has a 'page leak'.
>
> Since that appears to be what has happened...

The error message you got has nothing to do with a page leak.

> can anyone tell me what that means?  Does this mean that the data could be corrupted?  How do I fix this?
>
> Thanks!
>
> -Andew


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  -- Howard Chu
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