Re: [ADMIN] SqlServer to PostgreSql

2002-07-10 Thread Ludwig Lim


--- Luis Felipe Acevedo Fernandez
<[EMAIL PROTECTED]> wrote:
> Hi!
> I triyed to migrate a database from SqlServer to
> PostgreSql, but I have a 
> problem with char or varchar data types cos If I try
> to insert or select some 
> information from a table the program retrieve blank
> spaces, my program was 
> develop in PowerBuilder 7
> 
> Example If there is a table with a column char(5)
> and I insert the word "Hi" 
> with 2 character when the program try to retrieve
> the information 
> it gets "Hi   " 
> 

  I also encountered the same problem in Oracle when
porting char(n) datatypes.  Since char(n) datatypes
pads the string with spaces until it has n number of
characters.  What you can do is you can use either
ltrim,rtrim in selecting the data from SQL Server, or
use the trim() function in the PowerBuilder before
inserting it to a postgres database.

ludwig



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Re: [ADMIN] Database Diagrams.

2002-07-18 Thread Ludwig Lim


--- Geoff <[EMAIL PROTECTED]> wrote:
> Sorry if this is a question that has been answered
> in some form or another,
> but I need to know if there is a toold of some
> description that will help me
> get a diagram of my 7.2.1 database with the
> relationships. 
  -- There is a tool call ERWin (by Platinum
software).You can draw you ER Diagram and the program
will automatically generate the schema based on the ER
diagram you draw. This software is not open source and
is not free.

  -- I think there are free/open source alternatives.
Try searching under the category "CASE tool", "ER
diagram", etc.

-- ludwig

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Re: [ADMIN] Auto-Commit

2002-07-18 Thread Ludwig Lim


--- Roger Mathis <[EMAIL PROTECTED]> wrote:
> Hi
> 
> Is there a possibility to shut down the
> Auto-Commit-Funktion?
> Thanks

Use "BEGIN WORK" or "BEGIN TRANSACTION" statement
before typing other SQL statements. This will ensure
that the database will only commit if you type
"COMMIT"

ludwig.


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Re: [ADMIN] Opening 5432 port

2002-10-18 Thread Ludwig Lim

--- Benny <[EMAIL PROTECTED]> wrote:
> I can't access postegresl via ODBC, because 5432
> port seems to be closed.
> How can I open it?

  --> Try checking your firewall settings (IPChains /
IPTables) and see if its blocking port 5432.

Hope that helps,

ludwig.


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Re: [ADMIN] FATAL 1: configuration file 'postgresql.conf' has wrong permissions

2002-10-27 Thread Ludwig Lim
Hi:

--- Michiel Lange <[EMAIL PROTECTED]> wrote:
> seems like:
> there's read/write, write, write access on the file.
> I think the others might want to be able to read the
> file instead of writing
> to it.
> 
> "Andrey Romanchenko" <[EMAIL PROTECTED]>
> schreef in bericht
> news:a4t5vu$1jt2$1@;jupiter.hub.org...
> > hi all!
> >
> > when I attempt to start postgresql
> > i see error message
> >
> > FATAL 1: configuration file 'postgresql.conf' has
> wrong permissions
> >
> >
> > -rw--w--w-1 postgres postgres 3148 Feb 19
> 11:19 postgresql.conf

-- Try doing the following:
   su postgres
   chmod 600 postgresql.conf

Hope that helps,

ludwig.


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[ADMIN] Logging RAISE statement to a logfile aside from syslog

2002-11-03 Thread Ludwig Lim
Hi:

   Is there a way of logging the RAISE statements in a
plpgsql function to a logfile (aside from syslog)? I
noticed that all RAISE statments are only logged in
the syslog.

   The following is a portion my current configuration
related to logging:
   log_connection = true
   log_timestamp = true
   debug_level = 3
  
   syslog = 2
   syslog_facility = 'LOCAL0'
   syslog_ident = 'postgres'

   I did not raise the log level to 4 since it create
large volumes of logfile.

  The following is the portion of the script that
start my postgresql daemon at boot in /etc/rc.d/init.d
:

start() {
su postgres -c "/usr/local/pgsql/bin/pg_ctl start
-l /var/log/postgres/postgres.log -D /data 2>
/var/log/postgres/postgres.log"
}

 - I noticed that postgres.log does not contain
anything when the debug level is at 3.
   
  Version :  PostgreSQL 7.2.2 on i686-pc-linux-gnu,
compiled by GCC 2.96
  Platform : Redhat 7.1

Thank you in advance,
ludwig



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Re: [ADMIN] how sub queries and joins differs funcationally

2003-01-26 Thread Ludwig Lim
Hi shreedhar :

--- shreedhar <[EMAIL PROTECTED]> wrote:
> Can any body tell that how sub queries and joins
> differs funcationally.
> Because sub queries taking lot of time than joins.
>  
  The following could be the probable reasons:
  a) Your are using correlated queries - Correlated
queries always re-evaluate the sub-query for each row
processed.
b) You have an IN clause - try using EXISTS clause,
since it IN clause doesn't utilize the index when your
subquery is another SELECT statement. 

ludwig.



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[ADMIN] Error Messages

2003-07-04 Thread Ludwig Lim
Hi:

  I found the following snippets of error messages in
the log file of a computer that is running
Postgresql-7.2:

 NOTICE:  Message from PostgreSQL backend:
The Postmaster has informed me that some other
backend died abnormally and possibly corrupted shared
memory.I have rolled back the current transaction and
am going to terminate your database system connection
and exit. Please reconnect to the database system and
repeat your query.

Is the error message above related to the following
error messages below :
DEBUG:  pq_recvbuf: recv() failed: Connection timed
out
DEBUG:  pq_flush: send() failed: Connection reset by
peer
DEBUG:  pq_recvbuf: unexpected EOF on client
connection
DEBUG:  pq_flush: send() failed: Broken pipe

By the way, I didn't issue a kill to the
postgreSQL processes so I'm surpise by the "unexpected
EOF on client connection".

 Do I need to upgrade Postgresql? By the way there
are some errors if backup a 7.2 db and restore in 7.3
db. In 7.2 you can do something like "SELECT
CURRENT_TIMESTAMP()" in a plpgsql function, while this
will cause in an error in 7.3. 

  Do I need to change the hardware?

ludwig lim

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[ADMIN] Stuck Spinlock Error Message

2003-07-07 Thread Ludwig Lim
Hi:

   I notice the following error message in my
postgresql log file:

FATAL : s_lock (0x401db020) at lwlock.c Stuck
spinlock. Aborting

Version of my postgresql :

PostgreSQL 7.2.3 on i686-pc-linux-gnu compiled by GCC
2.96

Operating System : RedHat 7.1

Thanks in advance,
ludwig lim


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