Tracing APEX SQL
I'm having a problem with a bit of complex SQL in an Apex region.
I've been pasting bits of SQL into SQL Developer to debug the statements but this is a bit tedious when there are a lot of parameters to manually put in.
Is there a quick way to see the actual SQL statements that Apex is sending to the database (a trace or something)?
Hi Varad
I've found the trace files in udump but as I say there is no sign of any of the SQL Apex is running in page regions.
The files show SQL statements I run through SQL Plus and SQL Developer only.
I also tried adding &p_trace=YES to the end of my URLs but still no sign of any APEX SQL in the trace files.
Edit - I'm looking in the wrong directory. As you say they're in bdump - I'm looking in udump.
Thank you I've found them now.
Edited by: Antilles on Jan 6, 2009 5:50 AM
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Jari -
Hi guys:
I'm not an expert in SQL and I saw what Apex is doing is very useful.
Can I see the SQL code generated by Apex -by woking in Apex environment-With a little research on tracing, you should be able to easily get back the SQL statements that APEX uses, but not the PL/SQL. The PL/SQL is wrapped, so you won't be able to see that. With that said, the SQL is nothing special. That's is not a knock on the APEX team (I used to be on it), it's just nothing you couldn't find examples of throughout asktom.oracle.com.
The APEX Team follows some pretty simple and well known design principals that keeps the code very efficient. Above all else, the principal of designing the data structures for how they'll be accessed, not how they make sense to the developers is key. Since the nature of the APEX data structures is 95% read, they may make the edit of a page less efficient and do some extra work up front to make the display of that page as efficient and fast as possible.
In keeping with that theme, they will create indexes on tables that makes the reads as fast as possible, but again may make the create / edit of a page much slower due to additional index maintenance.
You'll notice that all of the tables have a single primary key column; none of this 3 column composite key stuff you see discussed all over this forum. This makes foreign keys, queries, updates, and deletes much easier on the programmers. I've stopped responding to the questions about DML on tables with 3+ composite key columns or tables with no primary key at all. IMHO it's just not good database design, but people get very defensive of their data models. So, I've given up. My advise to you is to stick with a single, random primary key that will never ever be changed. Also please ignore the flame war this is likely to start in this thread ;)
I'm also a big believer in instrumenting your code. This is definately Tom Kyte's influence on me, but also the APEX team's. Notice that APEX has a debug mode with timing, so they've clearly instrumented their code. You can see an example of this in a wiki project I'm working on now. Take a look at this package. Notice how every procedure in there has 2 "$IF $$debug $THEN" blocks, 1 at the beginning and one at the end. This is using conditional compilation and allows me to recompile this package with debug on so I can see how much time each procedure is taking. I can't stress this enough, instrument your code.
Other good SQL principals to keep in mind include:
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- Do everything in bulk SQL operations that you can. A lot of people resort to PL/SQL loops for processing. Tom Kyte refers to this as "row-by-row or slow-by-slow".
- Don't call functions in SQL at all if you are returning a lot of rows. That function will be called once for every row and you'll context switch between SQL and PL/SQL once for every row.
- For your most popular queries, particularly on "wide" tables, if you index every column in the select and predicates section, the data can be returned from just the index without going back to the table.
- Materialized views are your friend when you want to pre-compute the answers to your most expensive questions.
- Buy Tom Kyte's books. This is not a commercial for them, but the philosophy contained in those books has absolutely influenced the philosophy of the APEX team... They all used to work together on a daily basis.
Hope this helps,
Tyler -
제품 : SQL*NET
작성날짜 : 1997-10-10
Introduction
~~~~~~~~~~~~
For most problems you need to identify the relevant parts of a
connection to trace. To do this consider which scenario you are
having problems with and where tracing needs to be enabled.
Note that tracing produces a lot of output , especially at higher
trace levels.
There are 3 main areas of SQL*Net that can produce trace output:
1 = the SQL*Net 'client'
2 = the 'listener' process
3 = the SQL*Net 'server'.
a) Establishing a connection:
Client ----> Listener ----> Server
1 2 3
b) An established connection:
Client --------> Server
1 3
c) Opening a database link:
Client ----> Server ----> Listener -----> Server2
1 3 1 2 3
Note here that the Oracle server process is also a SQL*Net
client when it makes an outgoing call to a listener to
open a database link. Database links are OPENED when first
used. They should then remain open until closed.
d) An established database link:
Client ----> Server -----> Server2
1 3 1 3
In each case here there are several potential sampling points. You
should be able to identify quickly which of these scenarios matches
your setup. As these scenarios are likely to involve connections
between different machines you should remember that tracing for any
process is controlled by the configuration details that the process
reads WHEN IT IS STARTED. This is especially important when looking
at MTS connections as the SQL*Net server is the 'dispatcher' process.
Some dispatchers are started when the database instance is started
and others may start at a later time (on demand). Each dispatcher will
read their SQL*Net configuration WHEN THEY START.
7.2 Client Tracing
~~~~~~~~~~~~~~
For client TOOLS edit or create the file $HOME/.sqlnet.ora and add
the lines:
trace_level_client=16
trace_file_client=cli
trace_directory_client=/tmp # Or a known directory
trace_unique_client=true # Add '_pid' to trace filename
This will turn on FULL tracing for your user account only producing
output in a file called /tmp/cli_<PID>.trc .
(For some SQL*Net versions the file will be just /tmp/cli.trc)
For client 'ORACLE' process (as in the case of database links) put this
same information into $TNS_ADMIN/sqlnet.ora file.
On versions up to and including Oracle 7.0.16 client trace may not
add a process ID to the name of the trace file. This means two
processes may end up writing to the same trace file unless you
take care to control which processes write trace output to each file.
7.3 Listener Tracing
~~~~~~~~~~~~~~~~
Listener tracing can ONLY be configured in the listener.ora file.
Add the lines below to the listener.ora file:
trace_level_listener=16
trace_file_listener=listener
trace_directory_listener=/tmp # Or a known directory
This will define FULL listener tracing to the file /tmp/listener.trc.
You can enable this tracing by either:
lsnrctl reload
OR
lsnrctl stop;
lsnrctl start;
TCP/IP
~~~~~~
It is often useful to confirm that a listener is listening on a
specified address. Most Unix machines include a command called
'netstat' (Often in /etc or in /usr/etc). The command netstat -a
should list all TCP/IP end points on which a listener is listening.
Eg:
For a listener listening on HOST=... PORT=1580 there should be a
netstat entry of the form:
RecvQ SendQ Local Address Foreign Address TCP state
0 0 *.1580 *.* LISTEN
Note: Some versions of netstat will only list established connections
and not listen end points. See the man page on your machine.
7.4 Server Tracing
~~~~~~~~~~~~~~
Server side trace is not required as often as the other two traces
mainly because most problems are related to establishing a connection.
Once a connection has been established the client and server processes
are communicating. It is sometimes useful to see exactly what SQL
commands have been received by the server, and what data it has sent
back out.
The file $TNS_ADMIN/sqlnet.ora controls the server side tracing. Add
the lines below to this file:
trace_level_server=16
trace_file_server=server
trace_directory_server=/tmp # Or a known directory
Output should be sent to the file /tmp/server_<PID>.trc
Note: Server side tracing acts on the SQL*Net server side.
For dedicated connections this is the Oracle process on the
server machine.
For MTS connections this is the DISPATCHER and NOT the shared
server. Data is passed between the dispatcher and the shared
servers via the SGA and this does NOT involve SQL*Net.
It is also important to note that as a dispatcher handles
several client processes the dispatcher trace output can be a
mix of trace from many client processes making it VERY difficult
to follow. The general advice for such problems is:
a) See if the problem reproduces WITHOUT using MTS - if
so the trace is much cleaner
b) If a problem ONLY reproduces under MTS ensure the machine
is in a controlled environment so you can be sure that only
YOUR process is using the dispatcher.
7.5 Trace Summary
~~~~~~~~~~~~~
1) Identify where you need to trace.
2) Identify which files on which machines control tracing at these
points. Tracing is controlled in the following files:
Client Server Listener
~~~~~~ ~~~~~~ ~~~~~~~~
Files: $HOME/.sqlnet.ora sqlnet.ora listener.ora
sqlnet.ora
3) Add in the relevant trace parameters (See Below)
4) Restart any processes that need to read the new trace values.
Reload the listener as required.
5) Reproduce your problem
6) Save all your trace output immediately
7) Disable the tracing
7.6 Main Trace Parameters
~~~~~~~~~~~~~~~~~~~~~
trace_level_listener = off
trace_file_listener = Filename *1
trace_directory_listener = Directory *2
*1 Unquoted (") filenames will be translated into lower case.
*2 You CANNOT use environment variables in the Filename or Directory
name.
7.7 Diagnosing Trace output
~~~~~~~~~~~~~~~~~~~~~~~
Trace output can be very difficult to follow. Before looking at a
trace file make sure:
a) You are familiar with the sequence of events in setting up
a connection. SQL*Net connections follow a sequence of
events - you will need to determin where in the sequence
the problem occurs.
b) Do not be misled by error reports in the trace files. You
must follow the context of the errors - an error may be
quite valid at that point in a sequence. Eg: For client
connections a list of addresses to call is built - if the
first address yeilds no response the next address is tried.
This next address may yeild a response and the 'true' error
occurs at this point in the sequence.
c) Do not be misled by unusual 'Bequeath' connections in the
trace. If an error is received over SQL*Net the client
may use a "Bequeath" operation to spawn an oracle process
which it then uses to get the TEXT of the error. A very short
exchange of packets occurs and the bequethed process exits.
The 'TRUE' problem is likely to be before this bequeath
operation.
Useful trace 'tags':
The following are useful items to follow in trace files - these
are not guaranteed to be valid across all SQL*Net releases and
are for guidance only. Entries are assumed to be taken at trace
level 16 to allow data packets to be seen. This will produce a
LOT of trace output.
-<ERROR>-
Error information follows. Remember the error may be acceptable
osntns: Calling address
Shows address list constructed for a call OUT to a listener
nricall: Making call with following address information: ...
Shows the ACTUAL address being called from the above list
nsopen: entry
We are about to try and open a connection.
nsopen: transport is open
nsopen: error exit
A connection to the called address has been made / failed.
nsclose: ...
An established connection is being closed - check nearby
for errors.
nscall: redirected
The client has been redirected to a differenct address.
The next step should be to call the new address. The address
should appear in an earlier data packet.
nspsend / nsprecv
Outgoung / Incoming dataThis forum is for Oracle Migration Workbench issues, i.e. migration using the workbench from a non Oracle database to an Oracle database.
Here are some pointers that may be useful, but you may need to get more information elsewhere, for example Oracle Customer Support.
a Oracle 7.1 client (including your example) will connect to an Oracle 8.1.5 server.
Is the server correctly configured (can a client connect from another machine)?
Tracing can be turned on in the client, server and/or listener to get further information.
Turloch -
CLIENT SIDE TRACING IN SQL*NET V2
제품 : SQL*NET
작성날짜 : 1997-10-10
Client Tracing
~~~~~~~~~~~~~~
1) Set the environment variable TNS_ADMIN to the directory where the
tnsnames.ora and listener.ora files exist.
The default location is $ORACLE_HOME/network/admin. Set $TNS_ADMIN
to this if it is not set. This ENSURES you know which files you are
using.
2) Start the listener: lsnrctl
> set password <password>
> start
Note any errors. If you do not have a password set then ignore the
set password command.
3) If the listener started, start the database.
4) Create a file in $HOME called .sqlnet.ora and add the lines:
trace_level_client= 16
trace_file_client=client
trace_directory_client= /tmp (or similar)
trace_unique_client=true
5) Try to connect from SQL*Plus thus:
sqlplus username/password@alias
or
sqlplus username/password
substituting a suitable alias.
6) If you get an error we may need to see the client trace file
/tmp/client_<PID>.trc where <PID> is the process ID of the
client process (*1).
This will be quite large so it is best to FAX or EMAIL it.
*1 Note: On earlier versions of SQL*Net the filename may NOT have
the process ID appended to it.
Listener Tracing:
~~~~~~~~~~~~~~~~~
1) Edit your $TNS_ADMIN/listener.ora file and add the lines:
TRACE_LEVEL_LISTENER = 16
TRACE_DIRECTORY_LISTENER = /tmp
TRACE_FILE_LISTENER = "listener"
2) Stop and restart the listener:
lsnrctl stop
lsnrctl start
Output should go to /tmp/listener.trcBy default in 11g traces will go to the ADR which is a new feature.
To disable that feature add the following line to your sqlnet.ora
diag_adr_enabled =OFF
[oops] saw that this is over a month old this post - sorry about that!
hope that helps
John
Edited by: Johnsung on Sep 27, 2012 3:59 PM -
APEX SQL Reports bug? Apex 3.0.1 Oracle 10g XE
Hi
I have a few SQL Based reports and I'm having performance problems with showing them over remote connections.
I have looked at the HTML for the page produced from these reports and I see something very strange.
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rowStyle[50]='';This goes on for pages and pages and in fact it takes up 6.60MB of data on a single webpage. After a bit of testing, I discovered this only happens on reports that have grouping.
Is there a workaround for this?
Regards
AdamI note that the Licensing document at http://www.oracle.com/pls/xe102/homepage does not specify the version of Application Express.
I also note that the APEX version information is not found on the XE product page http://www.oracle.com/technology/products/database/xe/index.html
I also note that Oracle publishes the upgrade and the upgrade steps - specifically for XE - and still does not discuss any restrictions by version.
I also note that there is no license restriction or fee required for Apex at any version based on the XE specific and the regular 10gR2 licensing doc at http://www.oracle.com/pls/db102/homepage
For ME, the above is sufficient to assume that Apex 3 is included. Especially if I take a soft copy of the referenced license doc PDFs. -
Hi,
Apex - 4.0 and Oracle -11g
I m having a SQL Query report.
Query
SELECT htmldb_item.hidden(1,id) id,
htmldb_item.select_list_from_query_xl(2,name,'SELECT name ,
deptid
FROM emp
WHERE name like ''E%''') name,
htmldb_item.select_list_from_query_xl(3,deptname,'SELECT deptname from dept where deptid = ???') deptname
FROM tabel
My problem, in the report when the Select list for 'name' has been choosen , then it should retrieve the deptname based on the 'name'.
Is it possible ?you want select list value should affected in SQL report? i mean redirect and set value to SQL report?
-
UTL_HTTP, different error codes: APEX SQL Commands vs. Oracle SQL Developer
Hi, omniscient all!
I have a code sample where I try to request some URL from an inactive server:
declare
l_text varchar2(32000);
begin
l_text := utl_http.request('http://inactive.url:7777');
exception
when others then
declare
l_errcode number := utl_http.get_detailed_sqlcode;
begin
dbms_output.put_line(l_errcode);
dbms_output.put_line(sqlerrm(l_errcode));
end;
end;
/When I run it in Oracle SQL Developer it shows:
anonymous block completed
-12541
ORA-12541: TNS:no listenerWhen I run it in the APEX 4.0 SQL Commands window it shows:
-29263
ORA-29263: HTTP protocol error
Statement processed.The question is: why?
In real world, I need to make a HTTP POST request (no problem) and catch some exceptions. But instead of the usual ORA-12541 error APEX throws an ORA-29261 one.Any thoughts?
-
Apex & SQL server reporting services
Hi,
Has anyone integrated SQL server reporting services with apex?
I have a client that is running both Microsoft dynamics using SQL server reporting services and oracle.
I am building them a web application on the oracle database and would like to use apex for the application and piggy bank onto the SSRS.
The alternative is pl/PDF, which is too complex, jasper - can't see my client going down this road or bi publisher which is too expensive.
I would love to use apex as it is a great tool, but unless I can integrate with SSRS I suspect I'll have to use ASP.net
Thanks & happy new yearPLPDF is not complex at all. Just skim through their sample reports and try to build some of yours, Then you'll realize how easy and powerful it is.
-
Does CTAS evaluate "order by" in APEX SQL Command window?
I need to recreate my table in order to change the column order. When I use the SQL Commands window and run the SQL, it runs successfully, creates the new table, but doesn't reorder the columns.
Is this expected behavior?user648567 wrote:
Please update your forum profile with a real handle instead of "user648567".
I need to recreate my table in order to change the column order. When I use the SQL Commands window and run the SQL, it runs successfully, creates the new table, but doesn't reorder the columns.
What do you mean by "order by"?
Using an "ORDER BY" clause in a CTAS (in APEX or anywhare else) will have no effect on column order, which is determined by the order in which columns appear in the projection. It will affect the order in which rows are returned by that query, and it will not determine the order in which rows will be returned by querying the new table in the future.
To change the column order the columns in the SELECT clause of the CTAS would have to be in a different order from those in the original table, -
Tracing / Profiling SQL statements in Sybase
Hi Guys, I would like to capture the SQL statements that have been fired from a web app (bit like SQL Server's profiler). Is there such a tool / facility?Please note that I cannot use dbcc commands like traceon as DBA's wont grant me sa rights (in dev...crazy eh).
Is there any easy way of doing this?
ThanksGeneral comment about MDA monitoring (tools) ...
If the local DBAs don't have any tools for monitoring MDA tables there are a few 3rd party tools that can provide MDA monitoring (ie, little/no programming required by the local DBAs).
Most of these 3rd party tools cost $$ to purchase, and each one has its strengths and weaknesses.
There is one 3rd party tool (that I know of) that is free, highly configurable, and IMHO does a very good job at collecting/presenting MDA data (especially from a historical perspective): ASEMON
I personally:
- use ASEMON for P&T work
- install/configure ASEMON at my clients when a) they don't already have a MDA monitoring capability or b) they want to free up the $$ they're paying for some other 3rd party tool
NOTE: As Mike has pointed out, MDA collections can grow quite large and rather quickly. This is true with ASEMON, too. -
in the debug level normally we can trace the step by step. but how can we trace the sql statements.
In Debug mode
Go to menu Break Poiunts-> Break Point At -> Statement
Give the Break Point At Statement As SELECT
Now you will stop for each and every select in the Debug mode.
In general we use Sql trace. -
Create OS filesystem Directory Using Apex, SQL commands of SQL worshop
I am using Apex 3.0, Oracle Database 10g and IE 6.5
Code Here:
Create or replace Directory 'Data_Dir' as 'C:\temp\'
Error Message:
Insufficient Priveleges
This code runs fine when I access server remotely. Our projec team has no APex experience. our workspace administrator does not know how to grant appropriate privileges to my user accounts.
Please provide us step by step help immediately on 'How to create OS Directory from APEX'.
Thank you very much.Please provide us step by step help immediately on 'How to create OS Directory from APEX'.Please bear in mind that most people in this forum are doing it in their own time, without any financial gain from it. If you have an urgent support issue that is critical to your business and you want it answered immediately you should contact Oracle support, otherwise remember that you may need to wait some time for someone to answer your question here (especially considering it's the weekend).
However, in answer to your question, yes your DBA will need to grant 'create directory' or 'create any directory' to the user you've specified. If you're saying it runs fine when you access the server remotely (I'm assuming you mean via SQLPlus etc), that probably suggests your DBA has granted the right via a role which won't work while connected in the APEX environment (you will need to explicitly grant the permission to the user).
Hope this helps. -
Hi,
I'm trying to do a trace on a report. When I append &p_trace=YES to my URL there's no trace file generated in the udump directory. Does anyone know why this wouldn't work? Here's some information about the database and OS:
Ex URL: http://fcapex40.clarifit.com:8080/apex/f?p=101:4:4002989996060036::NO&p_trace=YES
SQL> SHOW PARAMETERS user_dump_dest
NAME TYPE VALUE
user_dump_dest string /usr/lib/oracle/xe/app/oracle/admin/XE/udumpOracle Database 10g Express Edition Release 10.2.0.1.0 - Product
Fedora release 12 - 2.6.31.5-127.fc12.i686.PAE
Martin
http://www.talkapex.comHi,
I did found this post
Re: Tracing APEX SQL
>
If your APEX installation uses the Embedded pl/sql gateway,the trace files will be in the 'bdump' directory. The file names will have the string pattern 's00' within them.
>
Regards,
Jari
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