Tim Uckun wrote:
Hi.
Sorry for being so dense but...
The document says
The transaction handle is freed. It and its cursors must not be used again
after this call, except with mdb_cursor_renew().
I am still very confused about reusing transactions.
Keep reading.
If I commit or abort a read write transaction I can't reuse the transaction
but I can re use the cursor? In the cursor documentation it says
Cursors that are only used in read-only transactions may be re-used, to avoid
unnecessary malloc/free overhead.
So this indicates only read only cursors can be reused right?
Yes.
So can you confirm my understanding? This is what I get from reading the docs.
A transaction can either be read write or read only.
If a transaction is read only you can commit or abort the transaction and then
re-open it again for further use.
No. Once a transaction is committed or aborted it is freed and cannot be
reused. Period, end of story. Both the commit() and abort() docs are quite
explicit about this.
If a transaction is read write then it can't be used again after you commit or
abort the transaction.
On Tue, Nov 22, 2016 at 3:17 PM, Howard Chu <[email protected]
<mailto:[email protected]>> wrote:
Tim Uckun wrote:
No. You can perform multiple write operations in a single
transaction.
But once the commit has been called the next write operation has to be
a newly
opened transaction right? The write transactions can't be re-opened.
http://lmdb.tech/doc/group__mdb.html#ga846fbd6f46105617ac9f4d76476f6597
<http://lmdb.tech/doc/group__mdb.html#ga846fbd6f46105617ac9f4d76476f6597>
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
