To: General Discussion of SQLite Database
Subject: Re: [sqlite] commit time
thanks for the discussion. i'll keep my eyes open for lock contention. i'm
going to start w/ the simple approach first and see how it goes.
thanks
tom
-Original Message-
From: sqlite-users-boun...@sqlite.org
: Wednesday, October 21, 2009 11:00 PM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] commit time
Dangerous and disturbing this puzzle is. Only a bug could have locked
those connections.
If I discover anything useful I'll report it separately (no need to
hijack this topic
] On Behalf Of Dan Kennedy
Sent: Thursday, October 22, 2009 1:27 AM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] commit time
On Oct 22, 2009, at 11:37 AM, John Crenshaw wrote:
> An open cursor will block. I've watched it. It was a major problem,
> and
> I spent
Dan.
>
> John
>
> -Original Message-
> From: sqlite-users-boun...@sqlite.org
> [mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Dan Kennedy
> Sent: Thursday, October 22, 2009 12:06 AM
> To: General Discussion of SQLite Database
> Subject: Re: [sqlite] commit time
[mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Dan Kennedy
Sent: Thursday, October 22, 2009 12:06 AM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] commit time
On Oct 22, 2009, at 5:21 AM, Tom Broadbent wrote:
> if thread 1 opens a read cursor in read uncommitted mode it
ral Discussion of SQLite Database
> Subject: Re: [sqlite] commit time
>
> Good, a single write thread saves you all the hassle involved with
> yielding. Unfortunately, even without multiple writers blocking is
> still
> possible. If thread 1 opens a cursor, and thread 2 tries
: Re: [sqlite] commit time
if thread 1 opens a read cursor in read uncommitted mode it can block a
write lock? i thought the read happens w/o a lock?
-Original Message-
From: sqlite-users-boun...@sqlite.org
[mailto:sqlite-users-boun...@sqlite.org] On Behalf Of John Crenshaw
Sent
:03 PM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] commit time
Good, a single write thread saves you all the hassle involved with
yielding. Unfortunately, even without multiple writers blocking is still
possible. If thread 1 opens a cursor, and thread 2 tries to write before
Database
Subject: Re: [sqlite] commit time
Yes, you have to call sqlite3_enable_shared_cache before opening any
database connections, then execute "PRAGMA read_uncommitted = true;" on
each connection. Blocking can still happen in some situations, but you
can handle it as I described in my orig
To: General Discussion of SQLite Database
Subject: Re: [sqlite] commit time
My understanding is that the shared cache allows table level locking for
multiple threads in a single process, and can do so efficiently because
the threads all share the same memory space, but if multiple processes
attempt
dbent
Sent: Wednesday, October 21, 2009 12:03 PM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] commit time
reading up on shared cache mode and found this:
"The locking protocol used to arbitrate between multiple shared-caches
or regular database users is described _else
al Message-
From: sqlite-users-boun...@sqlite.org
[mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Tom Broadbent
Sent: Wednesday, October 21, 2009 12:05 PM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] commit time
it sounds like this is the feature you recommend using:
&
users-boun...@sqlite.org [sqlite-users-boun...@sqlite.org] On
Behalf Of John Crenshaw [johncrens...@priacta.com]
Sent: Tuesday, October 20, 2009 7:18 PM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] commit time
Sounds like a great candidate for shared cache with PRAGMA
read_uncommit
lite-users-boun...@sqlite.org] On
Behalf Of John Crenshaw [johncrens...@priacta.com]
Sent: Tuesday, October 20, 2009 7:18 PM
To: General Discussion of SQLite Database
Subject: Re: [sqlite] commit time
Sounds like a great candidate for shared cache with PRAGMA
read_uncommitted = true.
If other thread
Message-
From: sqlite-users-boun...@sqlite.org
[mailto:sqlite-users-boun...@sqlite.org] On Behalf Of Tom Broadbent
Sent: Tuesday, October 20, 2009 8:05 PM
To: sqlite-users@sqlite.org
Subject: [sqlite] commit time
i have a simple join table containing two ids from two other tables. i
have an index
i have a simple join table containing two ids from two other tables. i have an
index on each of the ids in the join table.
CREATE TABLE ContentWordItem (word_id INT, item_id INT);
CREATE INDEX idx_ContentWordItem_word ON ContentWordItem(word_id); //
index to perform fast queries by
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