Monday, October 26, 2009

remove outdated files based on minor build number

I've created a script to remove old installation file based on the minor build number.
In one project I'm working on, we need to keep the file with the largest build number. Here's a sample to check which build number is the latest one.

for file in `find . -name \*$ESBPREFIX\*.isvp`
do
# echo $file
NAMELENGTH=`expr length $file`
POSITION=`expr $NAMELENGTH - 7`
ESBVERSION=`expr substr $file $POSITION 3`
if [ `expr index $ESBVERSION "."` -eq 1 ]; then
ESBVERSION=`expr substr $ESBVERSION 2 2`
fi
if [ `expr index $ESBVERSION "."` -eq 2 ]; then
ESBVERSION=`expr substr $ESBVERSION 3 1`
fi
# echo "[CO Build Number: $ESBVERSION]"
if [ $ESBVERSION -gt $MAXESBBDNR ]; then
MAXESBBDNR=$ESBVERSION
fi
done

Tuesday, October 06, 2009

Firing SOAP requests via Excel

Here's a tutorial about how to fire a soap request via Excel
http://www.brainbell.com/tutorials/ms-office/excel/Access_SOAP_Web_Services_From_Excel.htm .
The prerequisite is to get "Office Web Services Toolkit" from Microsoft website; then you can use it in VBA.
It'll be quite handy for those guys who work with SOA projects. A simple VBA can be built within excel worksheet to load soap request from OS and send it to the web service endpoint.

Monday, May 18, 2009

A tricky problem for xml validation

There's an interesting article about XML Schema nillable=”true” vs minOccurs=”0″ in Dimithu's blog. minOccurs is an xml attribute that most people understand; but for nillable="true", people might understand its meaning; however, how to use it in a correct way is not well known. By "correct way", I mean "the way that complies with W3C specifications".
Actually, a lot of software vendors are not clear about its usage as well. This leads to interoperability problems. Some BPM/SOA vendors implement different validation rules for a "nillable" tag, which are not in accordance with W3C specifications. 

Imagine an application is built which utilizes web services from different external system, and those web services require web service validation. The problem occurs that some systems send out the message which they consider as valid, while it's rejected by other systems due to different interpretation of "wsdl/soap validity". 

In short, the problem can be described as follows:
When an element is defined in wsdl using  xs:element name="nilint" nillable="true" type="xs:int"

The nilint element in the soap message should look like this if it's an empty node:
nilint xsi:nil="true" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"/
If it's not an empty node, we can remove the contained attribute because by default the value for nil is "false".

Considering the aforementioned scenario, if some development tools that are used to build the SOA application don't provide support for the nil tag, we need to find some way to workaround the issue. The normal way to do it is to create an interceptor class whenever the soap message is being sent out.
This looks like a minor issue, but indeed a lot tools have problems with it; for example, wsdl validation function in SoapUI does not work in a correct way.

Friday, May 08, 2009

Check Oracle tablespace

Here's the script to check oracle table space:

select d.status,   db.name dbname,   d.tablespace_name tsname,   d.extent_management,   d.allocation_type,   to_char(nvl(d.min_extlen / 1024, 0),     '99G999G990D90', 'NLS_NUMERIC_CHARACTERS = '',.'' ')     "ALLOC_SIZE (K)",   d.contents "Type", case when(d.contents = 'TEMPORARY') then   to_char(nvl(a.bytes / 1024 / 1024, 0),   '99G999G990D90', 'NLS_NUMERIC_CHARACTERS = '',.'' ') else   to_char(nvl(t.bytes / 1024 / 1024, 0),   '99G999G990D90', 'NLS_NUMERIC_CHARACTERS = '',.'' ') end as "Size (M)",   to_char(nvl((a.bytes - nvl(f.bytes, 0)) / 1024 / 1024,   0),   '99G999G990D90', 'NLS_NUMERIC_CHARACTERS = '',.'' ')   "Used (M)",   to_char(nvl((a.bytes - nvl(f.bytes, 0)) / a.bytes * 100,   0),   '990D90', 'NLS_NUMERIC_CHARACTERS = '',.'' ')   "Used (%)" from sys.dba_tablespaces d,     (select tablespace_name,      sum(bytes) bytes    from dba_data_files    group by tablespace_name) a,     (select tablespace_name,      sum(bytes) bytes    from dba_temp_files    group by tablespace_name) t,     (select tablespace_name,      sum(bytes) bytes    from dba_free_space    group by tablespace_name) f,   v$database db where d.tablespace_name = a.tablespace_name(+)  and d.tablespace_name = f.tablespace_name(+)  and d.tablespace_name = t.tablespace_name(+) order by 10 desc;

Monday, April 20, 2009

check tcp traffic between servers

Here's the troubleshooting command for tcpdump:

tcpdump -A -s 0 -l 'dst host hostname'

Another example:
tcpdump -nnvvXSs 1024 src 10.94.242.73 and dst port 80 and greater 512


It'll capture 1024 bytes for the request with the size bigger than 512 bytes, and from a specific source server to the http port (80)

drop all tables in an Oracle schema

Here's the script to drop all tables in a schema:

SET NEWPAGE 0
SET SPACE 0
SET LINESIZE 80
SET PAGESIZE 0
SET ECHO OFF
SET FEEDBACK OFF
SET HEADING OFF
SET MARKUP HTML OFF
SET ESCAPE \
SPOOL DELETEME.SQL
select 'drop table ', table_name, 'cascade constraints \;' from user_tables;
SPOOL OFF
@DELETEME

Friday, January 16, 2009

PL/SQL Tips - 1

1. Create procedure, function
procedure (...) is begin end;
function (...) return ... is ... begin end;
in, out, in out parameters.
2. Create package
package header (interface): create or replace package pkg as ... end;
package body (implementation): create or replace package body pkg as ... end;
3. Check objects created by user
select object_type, object_name, status from user_objects where object_type in ('FUNCTION','PROCEDURE','PACKAGE','PACKAGE BODY') order by object_type;
It's stored in the table called "user_objects".
4. Check implementations
select text from user_source where name= 'F_GETAREA_NR' order by line;
It's stored in the table called "user_source".