Sam Dave wrote:
> Hello,
>
> 1. I create a read-only transaction on an environment with mdb_txn_begin().
> 2.Then I get a database handle on the same environment (using mdb_dbi_open()
> within a separate transaction).
> 3. Finally I try to create and use a cursor using the database in 2. and
> transaction in 1. but I get various runtime errors ("Segmentation fault" or
> "double
> free or corruption").
>
> However, if I switch 1. and 2., everything works.
>
> Must a database really be created before a transaction? If so, curious to
> learn if this is mentioned anywhere in the docs (I didn't see it)
The docs are quite explicit:
http://www.lmdb.tech/doc/group__mdb.html#gac08cad5b096925642ca359a6d6f0562a
####
The database handle will be private to the current transaction until the
transaction is
successfully committed.
After a successful commit the handle will reside in the shared environment, and
may be
used by other transactions.
####
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