On Sun, 13 Nov 2005, Joost Kraaijeveld wrote:
I have a connection that is created with prepareThreshold=1 in the
connection string. I use a prepared statement that I fill with
addbatch() and that I execute with executeBatch() (for full source: see
application.java attachment).
LOG:
Hi Kris,
You have tested this with an insert statement. Could you do that also for an
update (or try to tell me how I can do that)? I am getting very strange
differences in running time between inserts and update ( 26 inserts are
measured in seconds, 26 updates over 1 column in the
On Saturday 12 November 2005 04:06, Matteo Beccati wrote:
Tom Lane wrote:
Peter Eisentraut [EMAIL PROTECTED] writes:
It seems to me that it has always been implicitly assumed around here
that the MERGE command would be a substitute for a MySQL-like REPLACE
functionality. After rereading
On 11/13/05, Robert Treat [EMAIL PROTECTED] wrote:
On Saturday 12 November 2005 04:06, Matteo Beccati wrote:
| 1 |1 | NULL |
Wow, that seems ugly maybe there's a reason for it, but I'm not sure we
could deviate from my$ql's behavior on this even if we wanted... they are the
standard
On Sat, Nov 12, 2005 at 10:46:33PM -0800, Kevin Brown wrote:
Hmm...but isn't the version number also something that can be stored
in the shared library itself during link time (e.g., via the -soname
option to the linker)? The manpage for ld under Linux implies that
this will cause the
Christopher Kings-Lynne [EMAIL PROTECTED] writes:
Maybe the solution is to make inherited tables actually the same table,
and jank it with an extra per-row attribute to differentiate them or
something :)
Aside from destroying the inheritance-for-partitioning stuff, this
wouldn't work for
Oliver Jowett [EMAIL PROTECTED] writes:
The driver does not actually issue PREPARE or EXECUTE statements; the
server is pretending that the protocol-level Prepare/Bind/Execute
messages are actually something issuing PREPARE/EXECUTE at the SQL level
I had not realized that the logging code
Tom Lane wrote:
Matt Newell [EMAIL PROTECTED] writes:
BTW, i'm on the list now, so no need to cc me.
Common practice around here is to cc people anyway --- this has grown
out of a history of occasionally-slow list mail delivery. If you don't
want it, best to fix it in your mail
Joe Conway [EMAIL PROTECTED] writes:
Jim C. Nasby wrote:
Instead of bending over backwards to try and support older cases, would
a compatability mode be possible? Seems that would solve a lot of
problems.
Last time I thought about this problem, that's what I concluded. I don't
think there
On 11/12/05, Matteo Beccati [EMAIL PROTECTED] wrote:
Tom Lane wrote:
Peter Eisentraut [EMAIL PROTECTED] writes:
It seems to me that it has always been implicitly assumed around here
that the MERGE command would be a substitute for a MySQL-like REPLACE
functionality. After rereading the
On Sun, 13 Nov 2005, Joost Kraaijeveld wrote:
I have a connection that is created with prepareThreshold=1 in the
connection string. I use a prepared statement that I fill with
addbatch() and that I execute with executeBatch() (for full source: see
application.java attachment).
LOG: statement:
On Sunday 13 November 2005 10:01, Gregory Maxwell wrote:
On 11/13/05, Robert Treat [EMAIL PROTECTED] wrote:
On Saturday 12 November 2005 04:06, Matteo Beccati wrote:
| 1 |1 | NULL |
Wow, that seems ugly maybe there's a reason for it, but I'm not sure
we could deviate from
Robert Treat [EMAIL PROTECTED] writes:
I disagree in that REPLACE is advertised as a solution for the INSERT else
UPDATE problem, but has a different behavior than a true INSERT else UPDATE
would produce. Maybe that's a problem with the implementation, or maybe
it's a problem in the
I was just looking briefly at doing drop if exists as we discussed
recently.
The MySQL syntax is actually drop table if exists foo
Implementing this unfortunately generates a shift/reduce conflict,
unless I put IF in the func_name_keyword list, which strikes me as a bad
idea.
Tom Lane wrote:
It'd be useful to look at what comparable functionality is offered by
other DBs besides MySQL. Anyone know what DB2 or Oracle have in this
area?
IIRC they both have MERGE.
--
Regards
Petr Jelinek (PJMODOS)
---(end of
Petr Jelinek wrote:
Tom Lane wrote:
It'd be useful to look at what comparable functionality is offered by
other DBs besides MySQL. Anyone know what DB2 or Oracle have in this
area?
Oracle:
http://www.psoug.org/reference/merge.html
http://www.psoug.org/reference/translate_replace.html
On Sun, 13 Nov 2005, Joost Kraaijeveld wrote:
You have tested this with an insert statement. Could you do that also
for an update (or try to tell me how I can do that)? I am getting very
strange differences in running time between inserts and update ( 26
inserts are measured in seconds,
I wrote:
Martijn van Oosterhout kleptog@svana.org writes:
In this particular case the syntax makes it unclear that the substring
is the problem. Perhaps here the solution would be to put a cast in the
grammer, like so:
...
But I think we could do this in substr_list in the case where we have
Tom Lane wrote:
IIRC, SQL's MERGE deals with this by offering two quite separate
specifications of what to do when there is or isn't already a
matching row.
In that regard, MERGE is quite flexible, but MERGE doesn't address the
point of REPLACE, because MERGE requires *two* tables as input,
I wrote:
... Now, when the bitmap is present, it would be fairly tedious
to calculate the length of the bitmap to determine the offset to the
actual data; and that's an operation that we'd like to be cheap. What
I'm thinking of doing is commandeering the whole flags field of
ArrayType (which
Is there a way to force select * from foo to use binary values ?
Dave
---(end of broadcast)---
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
Martijn van Oosterhout wrote:
None of this applies to PostgreSQL because we open the modules
directly, and don't rely on the linker loader.
Ah, right. I forgot the context was the server, not one of the
utilities...
Sorry for the waste of bandwidth...
--
Kevin Brown
Peter Eisentraut wrote:
In that regard, MERGE is quite flexible, but MERGE doesn't address the
point of REPLACE, because MERGE requires *two* tables as input, whereas
REPLACE only takes *one*. Unless someone can show that you can trick
MERGE into doing the REPLACE job anyway, we're not
On Sun, Nov 13, 2005 at 11:32:47PM +0100, Petr Jelinek wrote:
I am really not db expert and I don't have copy of sql standard but you
don't need to use 2 tables I think - USING part can also be subquery
(some SELECT) and if I am right then you could simulate what REPLACE
does because in
Andrew Dunstan [EMAIL PROTECTED] writes:
The MySQL syntax is actually drop table if exists foo
Implementing this unfortunately generates a shift/reduce conflict,
What did you try exactly? I don't see any fundamental reason for
a conflict here. You may just need to rearrange the grammar
Dave Cramer [EMAIL PROTECTED] writes:
Is there a way to force select * from foo to use binary values ?
In what context?
There is a provision for that in the V3 extended-query protocol.
regards, tom lane
---(end of
Yeah,
I finally read it through and found it. There's some anecdotal
evidence of up to 2x performance, so I'm interested in how to
implement this in the jdbc driver. ( I'm a little skeptical about 2x)
I was thinking that it may be necessary to issue a describe before
the execute, but I'm
Dave Cramer [EMAIL PROTECTED] writes:
I was thinking that it may be necessary to issue a describe before
the execute, but I'm thinking now that the driver can only handle
specific types, so anything outside of what it knows about would be
an error anyway.
I gather it's not possible to
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