pg_proc.h still needs modifying, but this gets it in there so that we can
get around any compiler bugs. Will try and get the pg_proc.h entries done
up later tonight...
Now we have #define _CPU_INDEX_PAGE_WEIGHT_ 0.033 (/* CPU-index-to-page cost
weighting factor */) in addition to
#define _CPU_PAGE_WEIGHT_ 0.065 (/* CPU-heap-to-page cost weighting factor
*/).
1. Enable to have different _CPU_PAGE_WEIGHT_ for heap and index.
2. PageWeights are variables now.
3. Fixed using ceil((double)selec*indextuples) as estimation
for expected heap pages: ceil((double)selec*relpages) now.
Fix (hack) IndexSelectivity():
use sum(npages)/((nkeys == 1) ? 1 : nkeys + 1) as expected index page
estimation for multi-key quals - instead of sum(npages).
In old code npages for x > 10 and x < 20 is twice as for x > 10 - cool ?
From: Thomas Lockhart <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: [HACKERS] Fix for European dates
This apparently fixes the European date reading problem reported
by several (European) bleeding edge adopters. I tried a few test
cases and it doesn't break the non-EuroDate cases in my test suite.
This commit represents a clean compile with the new templates under
FreeBSD
The Makefile(s) have all been cleaned up such that there is a single
LDFLAGS vs LD_ADD or LDADD or LDFLAGS or LDFLAGS_BE. The Makefile(s)
should be alot more straightforward then they were before...and
consistent
Further extended Makefile.global/build/configure so that we can
have a 'template' file for each OS (and each version of OS, as in BSDi)
which is used as much as possible to generate Makefile.global
Any future ports should look at using the template file as a basis,
before moving over to Makefile.global.
This will most probably break alot of the ports, atho I've tried to
be very neat about it...
I sent in changes previously and they were rejected because they didn't
follow ANSI spec. Here is the input part of the changes again. Even
though it allows more flexibility for inputting different formats, it
is also backwards compatible with the standard version. I have also
not changed the output format so it will still output the ANSI forms.
Is this acceptable to everyone?
From: Thomas Lockhart <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: [HACKERS] Aggregate function patches
Here are the aggregate function patches I originally sent in last December.
They fix sum() and avg() behavior for ints and floats when NULL values are
involved.
I was waiting to resubmit these until I had a chance to write a v6.0->v6.1
database upgrade script to ensure that existing v6.0 databases which have
not been reloaded for v6.1 do no break with the new aggregate behavior.
These scripts are included below. It's OK with me if someone wants to do
something different with the upgrade strategy, but something like this
was discussed a few weeks ago.
Also, there were a couple of small items which cropped up in doing a clean
install of 970403 (actually 970402 + 970403 changes since the full 970403
tar file appears to be damaged or at least suspect). They are the first
two patches below and can be omitted if desired (although I think they
aren't dangerous :).
From: Thomas Lockhart <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: [HACKERS] More date time functions
Here are some additional patches mostly related to the date and time
data types. It includes some type conversion routines to move between
the different date types and some other date manipulation routines such
as date_part(units,datetime).
I noticed Edmund Mergl et al's neat trick for getting function overloading
for builtin functions, so started to use that for the date and time stuff.
Later, if someone figures out how to get function overloading directly
for internal C code, then we can move to that technique.
These patches include documentation updates (don't faint!) for the built-in
man page. Doesn't yet include mention of timestamp, since I don't know
much about it and since it may change a bit to become a _real_ ANSI timestamp
which would include parser support for the declaration syntax (what do you
think, Dan?).
The patches were developed on the 970330 release, but have been rebuilt
off of the 970402 release. The first patch below is to get libpq to compile,
on my Linux box, but is not related to the rest of the patches and you can
choose not to apply that one at this time. Thanks in advance, scrappy!
From: "Martin J. Laubach" <mjl@CSlab.tuwien.ac.at>
Subject: [HACKERS] Patch: SET var TO 'val'
Here is a patch that adds a "SET variable TO 'somevalue'" capability
to the parser, and then calls the SetPGVariable() function (which does
just issue a elog(NOTICE) to see whether it works).
That's the framework for adding timezone/date format/language/...
stuff.
From: Anton de Wet <adw@obsidian.co.za>
Subject: [HACKERS] Small patch to pgtclCmds.c
Hi I have made the following small change to the extensions I made to
pgtclCmds.c quite a while ago.
At the moment there is a -assignbyidx option to pg_result assigning the
returned tuples to an array by using the 1st field of the select statement
as the key to the array.
eg "select name,age from vitalstatistics" will result in an array with
myarray(peter) = 32
myarray(paul) = 45
Often I need to have a pseudo-multi dimentional
array eg. "select name,age from vitalstatistics where occupation='plummer'
I would like to be able to generate an array
newarray(peter,overpaid) = 32
So to add a arbitrary string to the key value I have extended
here are little patches to get Postgres 6.1 works with locale stuff.
This is a patch against 970402.tar.gz, there are no problem to apply them
by hand to 6.0 release. Collate stuff tested about 1-2 months in real
working database but I'm sure there must be no problem. US hackers
could vote against locale implementation ( locale for sure will affect to
speed of postgres ), so I introduce variable USE_LOCALE which
controls locale stuff. Non-US users now could use ~* operator
for searching and <order by> for strings with nation alphabet.
Please, don't forget, as I did first time, to set environment variable
LC_CTYPE and LC_COLLATE because backend get locale information from them.
I start postmaster from a little script, assuming that shell is Bash shell
it looks like:
Marc G. Fournier [Fri, 28 Mar 1997 07:18:06 +0000 (07:18 +0000)]
From: Thomas Lockhart <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: [HACKERS] Small date patches (resubmitted)
Here a some small patches for the date/time code. They set the default
output format for the datetime type to the traditional Postgres
style, and fix a date debugging declaration. I submitted these
a couple of days ago, but they might have gotten lost...
NOTE: the second patch to dt.c is what I believe D'Arcy submitted as well,
that I claimed was taken out...sorry D'Arcy, my fault :(
Marc G. Fournier [Fri, 28 Mar 1997 07:13:21 +0000 (07:13 +0000)]
From: Thomas Lockhart <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: Re: [HACKERS] abstime "now" broken
Yes, I broke 'now' :( with an attempt at a bug fix involving
servers running in the UTC/GMT timezone. These patches fix
the problem, and have been tested in GMT (+00 hours),
PST (-08), and NZT (+12) timezones which exercized the code for
various cases including across day boundaries. btw, this code
fixes the same type of problem for 'today', 'yesterday', 'tomorrow',
for DATETIME, ABSTIME, DATE and TIME types.
The bugfix itself is quite small, but I have accumulated other
changes in the datetime data type and include them here also.
One set of changes involves printing ISO-formatted dates and
is in response to the helpful information from Kurt Lidl regarding
ANSI SQL dates. I'll send another e-mail sometime soon discussing
more issues he has raised...
Marc G. Fournier [Fri, 28 Mar 1997 07:06:53 +0000 (07:06 +0000)]
From: Dan McGuirk <mcguirk@indirect.com> Reply-To: hackers@hub.org, Dan McGuirk <mcguirk@indirect.com>
To: hackers@hub.org
Subject: [HACKERS] tmin writeback optimization
I was doing some profiling of the backend, and noticed that during a certain
benchmark I was running somewhere between 30% and 75% of the backend's CPU
time was being spent in calls to TransactionIdDidCommit() from
HeapTupleSatisfiesNow() or HeapTupleSatisfiesItself() to determine that
changed rows' transactions had in fact been committed even though the rows'
tmin values had not yet been set.
When a query looks at a given row, it needs to figure out whether the
transaction that changed the row has been committed and hence it should pay
attention to the row, or whether on the other hand the transaction is still
in progress or has been aborted and hence the row should be ignored. If
a tmin value is set, it is known definitively that the row's transaction
has been committed. However, if tmin is not set, the transaction
referred to in xmin must be looked up in pg_log, and this is what the
backend was spending a lot of time doing during my benchmark.
So, implementing a method suggested by Vadim, I created the following
patch that, the first time a query finds a committed row whose tmin value
is not set, sets it, and marks the buffer where the row is stored as
dirty. (It works for tmax, too.) This doesn't result in the boost in
real time performance I was hoping for, however it does decrease backend
CPU usage by up to two-thirds in certain situations, so it could be
rather beneficial in high-concurrency settings.
Back to this timezone stuff. The struct tm has a field (tm_gmtoff) which
is the offset from UTC (GMT is archaic BTW) in seconds. Is this the
value you are looking for when you use timezone? Note that this applies
to NetBSD but it does not appear to be in either ANSI C or POSIX. This
looks like one of those things that is just going to have to be hand
coded for each platform.
Why not just store the values in UTC and use localtime instead of
gmtime when retrieving the value?
Also, you assume the time is returned as a 4 byte integer. In fact,
there is not even any requirement that time be an integral value. You
should use time_t here.
The input function seems unduly restrictive. Somewhere in the sources
there is an input function that allows words for months. Can't we do
the same here?
There is a standard function, difftime, for subtracting two times. It
deals with cases where time_t is not integral. There is, however, a
small performance hit since it returns a double and I don't believe
there is any system currently which uses anything but an integral for
time_t. Still, this is technically the correct and portable thing to do.
The returns from the various comparisons should probably be a bool.
Marc G. Fournier [Tue, 25 Mar 1997 09:08:06 +0000 (09:08 +0000)]
Here's two more diffs...
The first fixes a warning from gcc about the assignment within the condition.
The extra set of parens should not make a difference, but with -Werror, they
are necessary.
The second fixes an "ln -s" invocation that assumes the current directory is
implicitly the target if not specified. Not true in all cases, and again, it
should not make a difference except to those implementation that it does.
From: "Michael P. Snyder" <msnyder@hawkeye.huntersmoon.com>
Marc G. Fournier [Tue, 25 Mar 1997 08:25:47 +0000 (08:25 +0000)]
Rather than make this a Linux test, we should just test for the existence
of endian.h. I figure that if it exists it's pretty sure that it has
the byte order information and we may catch some other ports without
any further testing.
Marc G. Fournier [Tue, 25 Mar 1997 08:11:24 +0000 (08:11 +0000)]
From: Thomas Lockhart <Thomas.G.Lockhart@jpl.nasa.gov>
Subject: [HACKERS] More patches for date/time
I have accumulated several patches to add functionality to the datetime
and timespan data types as well as to fix reported porting bugs on non-BSD
machines. These patches are:
dt.c.patch - add datetime_part(), fix bugs
dt.h.patch - add quarter and timezone support, add prototypes
globals.c.patch - add time and timezone variables
miscadmin.h.patch - add time and timezone variables
nabstime.c.patch - add datetime conversion routine
nabstime.h.patch - add prototypes
pg_operator.h.patch - add datetime operators, clean up formatting
pg_proc.h.patch - add datetime functions, reassign conflicting date OIDs
pg_type.h.patch - add datetime and timespan data types
The dt.c and pg_proc.h patches are fairly large; the latter mostly because I tried
to get some columns for existing entries to line up.
Marc G. Fournier [Tue, 25 Mar 1997 02:37:21 +0000 (02:37 +0000)]
- Renamed the variable names to something shorter, and I hope
nicer. Also, I grabbed my copy of the Informix manual, and
added a couple of variables that make sense (formats for
money, time, a language setting, a timezone).
- New functions SetPGVariable() and GetPGVariable() in tcop/*.
These don't actually do anything for the moment, but should
be enough to implement the SET var_name TO var_val in the
parser?
SetPGVariable() expects just two strings, the var_name and
the var_value from above, and is expected to do the right thing.
Returns TRUE if everything okay.
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