Sql queries - slow database

hi all,
is there a general but specific way to generate a list of sql queries that are consuming most resources and resulting in slow database performance?
thanks.

There are very few ways in this world that are "general but specific".
You can use "general" tools like StatsPack and AWR.
You can write "general" queries on V$SQL, V$SQLAREA, V$SQLSTATS.
You can use "specific" methods like Tracing.
You can use "specific" methods like Client side (or Application Server side) Logs.

Similar Messages

Storing SQL queries in database itself.

I want to store SQL queries in 9i database itself so that I just need to pass the parameters from VB.NET front end and the query will execute. How can I do this?

Possibly make use of Stored packages/procedures/functions?
Back in 97/98 I had worked with VB (version 6 at that time) application for which I had written stored procedures to do exactly that... (except for select) VB application would pass parameter values to these procedures for doing inserts/updates/deletes. No application user was given direct insert/update/delete privileges.
Also I had triggers written for each of the table involved to keep footprint (user id and date/time) for last update/insert for each of the row.
I don't remember for sure if the application deleted rows from the DB. I think the application handled delete by actually updating a flag (active/inactive) again with a foot print so that you can track back the "deletes".
my 1/2 cent worth of thought
Message was edited by:
user551318

Sql queries in database adapter

Hi,
I want to write, say, 2 select statements in the database adapter. How can I accomadate using "execute pure sql"?
Regards,
Aasta

maybe these links will help you :
Urgent : Fault Policies in 11g
http://download.oracle.com/docs/cd/E15523_01/integration.1111/e10226/soacompapp_mang.htm
http://www.it-eye.nl/weblog/2009/12/10/using-fault-management-framework-in-oracle-11g/
http://download.oracle.com/docs/cd/E12839_01/integration.1111/e10224/med_faulthandling.htm#SOASE274

How to use database control to execute sql queries which change at run time

Hi all,
I need to execute sql queries using database controls , where the sql changes
at run time
based on some condition. For eg. based on the condition , I can add some where
condition.
Eg. sql = select id,name from emp where id = ?.
based on some condition , I can add the following condition .
and location = ?.
Have anybody had this kind of situation.
thanks,
sathish

From the perspective of the database control, you've got two options:
1) use the sql: keyword to do parameter substitution. Your observation
about {foo} style sbustitution is correct -- this is like using a
PreparedStatement. To do substitution into the rest of the SQL
statement, you can use the {sql: foo} substitution syntax which was
undocumented in GA but is documented in SP2. Then, you can build up
the filter clause String yourself in a JPF / JWS / etc and pass it into
the DB control.
For example:
* @jc:sql statement="select * from product {sql: filter}"
public Product[] getProducts(String filter) throws SQLException;
This will substitute the String filter directly into the statement that
is executed. The filter string could be null, "", "WHERE ID=12345", etc.
2) you can use the DatabaseFilter object to build up a set of custom
sorts and filters and pass that object into the DB control method.
There have been other posts here about doing this, look for the subject
"DatabaseFilter example".
Hope that helps...
Eddie
Dan Hayes wrote:
"Sathish Venkatesan" <[email protected]> wrote:
Hi Maruthi,
The parameter substituion , I guess is used like setting the values for
prepared
statements.
What I'm trying to do , is change the sql at run time based on some condition.
For example ,
consider the following query :
select col1,col2 from table t where t.col3 > 1
At run time , based on some condition , I need to add one more and condition.
i.e. select col1,col2 from table t where t.col3 > 1 and t.col4 < 10.
This MAY not address your issue but if you are trying to add "optional" parameters
you may try including ALL the possible parameters in the SQL but send in null
for those params that you don't want to filter on in any particular case. Then,
if you word your query
as follows:
select col1, col2 from table t where t.col3 > 1 and (t.col4 = {col4param} or
{col4param} is null) and (t.col5 = {col5param} or {col5param} is null) ...
you will get "dynamic" filters. In other words, col4 and col5 will only be
filtered if you send in non-null parameters for those arguments.
I have not tried this in a WL Workshop database control but I've used
this strategy dozens of times in stored procedures or jdbc prepared statements.
Good luck,
Dan

How to see what SQL queries are made to my Database Server?

Hi all,
I'm a newbie. I'd like to know if there's a way to find out what SQL queries are being made to my Database server at the server end.
Is it possible that Oracle Database Manager logs this information (including the exact query/SQL)somewhere in its logs? How to enable such an option and/or view the recent SQL queries made ?
Please enlighten me. Thanks in advance.
Thanks and Regards
Sharat

"I checked the V$SQLTEXT view too. It has only 64 characters for SQL_TEXT field." Yes yes but you might have noticed that it also has the column called piece. The view shows the full SQL statement broken up into little pieces. Use ADDRESS and HASH_VALUE to link to v$sql. There is also a view V$SQLTEXT_WITH_NEWLINES that throws in some line separators to make it "easier" to read.
Example below shows full text of SQL statements currently executing.
SQL> column address noprint
SQL> column hash_value noprint
SQL> break on hash_value skip 1
SQL> select
2     a.address, a.hash_value, b.sql_text
3 from
4     v$sql a, v$sqltext b
5 where
6     a.users_executing > 0
7     and b.address = a.address
8     and b.hash_value = a.hash_value
9 order by
10     a.address, a.hash_value, b.piece ;
SQL_TEXT
select    a.address, a.hash_value, b.sql_text from    v$sql a, v
$sqltext b where    a.users_executing > 0    and b.address = a.a
ddress    and b.hash_value = a.hash_value order by    a.address,
a.hash_value, b.piece
begin quest_exec.get_message(:cmd, :peer, :owner, :folder, :scri
pt, :delay); end;
6 ligne(s) sélectionnée(s).
SQL> select
2     a.address, a.hash_value, b.sql_text
3 from
4     v$sql a, v$sqltext_with_newlines b
5 where
6     a.users_executing > 0
7     and b.address = a.address
8     and b.hash_value = a.hash_value
9 order by
10     a.address, a.hash_value, b.piece ;
SQL_TEXT
select
   a.address, a.hash_value, b.sql_text
from
   v$sql a, v
$sqltext_with_newlines b
where
   a.users_executing > 0
   and b
.address = a.address
   and b.hash_value = a.hash_value
order by
   a.address, a.hash_value, b.piece
begin quest_exec.get_message(:cmd, :peer, :owner, :folder, :scri
pt, :delay); end;
6 ligne(s) sélectionnée(s).

Can I use Microsoft SQL Server Management Studio version 11.0 to write SQL queries for "SQL Server Compact 4.0 Local Database"

Hi, Can I use Microsoft SQL Server Management Studio version 11.0 to write SQL queries for "SQL Server Compact 4.0 Local Database" ?
When I use Connect Object Explorer, the "Connect to Server" dialog box which pops up has only 4 selections in the Server Type Drop Down List. They are Database Engine, Analysis Services, Reporting Services & Integration Services. I have read
somewhere that there should be a compact database option. but I do not see it.
What I would like to do is use free form SQL Queries against the tables in "SQL Server Compact 4.0 Local Database" .
Once I have validated these queries, then I will use them in my Visual Studio 2012 C#, ASP.NET application. I created the Local Database using Visual Studio 2012 for use by my application.
Thank you for your help..
diana4

Hello,
With SSMS 2005 we have had the Option to work with SQL CE database files, but not with higher Version of SSMS.
You can use the free SQL CE Toolbax instead; see
http://sqlcetoolbox.codeplex.com/
Olaf Helper
[ Blog] [ Xing] [ MVP]

SQL queries from a Citadel database

We are retrieving data with third-party package SQL queries from a Citadel database. Certain queries for some object members will not return data, but the SQL search application software returns an "error". An analysis of the error from the SQL end does not find problem on SQL side. I suspect corruption of Citadel database. The link to database is good, as most tags do return a value as expected.
This problem occurred at the time of re-location of the database to a replacement computer. Any ideas on how to fix such a problem?

Can you give an example of the "bad" SQL statement and a good one?
Ryan Shi
National Instruments

SQL queries against a database view from an external system?

Hi,
I have a question about Database views in se11.
Is it possible to create a database view and that do SQL queries against this view from an
external system, Not a SAP system?
Please, I need you help.
Best Regards
Annika

Hi Annika,
it is possible , yes... but depends on your database systems in the SAP source DB and the external DB
(easier if they are the same, i.e. both ORACLE) - check out with your BASIS team (they have to create something like a "database link" in the external DB system that you can use to access the tables in the SAP source).
In the external DB you sure can create a view on these "remote" tables.
We used this to pull data form SAP DB to another DB system (both ORACLE based).
But this is NOT supported by SAP , so be carefull. Below is the restriction for ORACLE (as well for other DB systems )
see SAP note 581312 "Oracle database: licensing restrictions"
As of point 3, it follows that direct access to the Oracle database is
only allowed for tools from the areas of system administration and
monitoring. If other software is used, the following actions, among
other things, are therefore forbidden at database level:
* Querying/changing/creating data in the database
* Using ODBC or other SAP external access methods
This means that additional application software is only allowed if this
accesses the database through SAP interfaces (for example, RFC, SAP J2EE
or BAPI).
I would say if you KNOW the tables involved (using valid WHERE conditions and joins )
and don't start queries from hell (ad-hoc type) wich can bring down your SAP system performance
you can try it.
But be warned...
good luck...
bye
yk

Sql queries for this database schema

1) Patient—PatientID, Name, DOB
2) Doctor—DoctorID, Name, MedLicenseNumber, Phone
3) Medication—MedicationID, BrandName, GenericName
4) Prescription—PrescriptionID, Date, PatientID, PrescriberID, MedicationID
Specify the SQL queries to retrieve:
a) The prescription information along with patient name, DOB, medication brand name, and prescribing doctor name sorted by most recent date.
b) The most prescribed generic medication name

Looks like assignment question to me
a, seems to be a case of straight forward join among all the involved tables on common fields. Suggest you learn about joins and try it out yourself.
see below link
http://www.w3schools.com/sql/sql_join.asp
b, Have a look at GROUP BY. you need to apply group by and take medicine name which repeats maximum (ie largest count value)
see
http://www.w3schools.com/sql/sql_groupby.asp
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs

SQL Queries in Code V/s Stored Procedures

Hi Friend,
Can any one of you guide me with following..
What is faster ? using SQL Queries in Java code or using Stored Procedures which are called from code?
I understnd Stroed Procedures are faster and definitely it provides more maintainability.
If any one can give me any links or resources which outlines pros and cons of using Stored Proc and SQL Queries embedded in Java than it would be a great help..
If there are any articles which proves either of the above is a preferred way, that would also help..
Appreciate the effort in advance !!
Thanks
Gurudatt

Well one benefit of Stored Procs is that you "compile" it on the database whereas you might build your query on the fly in java... test coverage is important in order not to have such things as a typo in a column name....
Still, if you change a table, you have to go through all the procedures in SQL and likely to do so in some of your business object... and trust me, that can be hell!
It all depends on the use of the app...
From my experience, Stored procedure are much faster than built-on-the-fly SQL (and quite faster than prepared statements depending on the JDBC driver, the re-use of connections etc...)....
IMHO, you'd probably be wise to start of with prepared statements, and when the schema seems stable enough (ie unlikely to change), look for the slower queries and convert them to stroed procedures.
If you don't have to support several databases and are tight on performance, you can even include some logic in your stored procedure (e.g. update several tables, based on various selects...etc...). The language is usually quite powerful, and that can save you the run-time of selecting, converting to object , process and update (i.e. several roud-trip between DB and app)...
Tshcuss!
Chris

Monitoring SQL Queries

I work with IBM Cognos Business Intelligence software. Clients create reports. The data is on SQL Server 2008 R2. The client writes reports and behind the scenes Cognos creates SQL queries to retrieve the data for the report. I do not have access within
Cognos to view all the SQL queries used to create a report. Sometimes the reports are really complicated, with many calculations on large amounts of data, and they can run for hours. How can i see the actual queries that are causing the problems? I would
need to limit it to a specific database at a minimum.

Your question is very general. The slowness could be caused be missing index, resource bottleneck etc. You need start investigate where sql server is waiting the time,this can done by wait stats analysis. use the code bellow find out the wait
WITH Waits AS
(SELECT wait_type, wait_time_ms / 1000. AS wait_time_s,
100. * wait_time_ms / SUM(wait_time_ms) OVER() AS pct,
ROW_NUMBER() OVER(ORDER BY wait_time_ms DESC) AS rn
FROM sys.dm_os_wait_stats
WHERE wait_type NOT IN ('CLR_SEMAPHORE','LAZYWRITER_SLEEP','RESOURCE_QUEUE','SLEEP_TASK'
,'SLEEP_SYSTEMTASK','SQLTRACE_BUFFER_FLUSH','WAITFOR', 'LOGMGR_QUEUE','CHECKPOINT_QUEUE'
,'REQUEST_FOR_DEADLOCK_SEARCH','XE_TIMER_EVENT','BROKER_TO_FLUSH','BROKER_TASK_STOP','CLR_MANUAL_EVENT'
,'CLR_AUTO_EVENT','DISPATCHER_QUEUE_SEMAPHORE', 'FT_IFTS_SCHEDULER_IDLE_WAIT'
,'XE_DISPATCHER_WAIT', 'XE_DISPATCHER_JOIN', 'SQLTRACE_INCREMENTAL_FLUSH_SLEEP'))
SELECT W1.wait_type,
CAST(W1.wait_time_s AS DECIMAL(12, 2)) AS wait_time_s,
CAST(W1.pct AS DECIMAL(12, 2)) AS pct,
CAST(SUM(W2.pct) AS DECIMAL(12, 2)) AS running_pct
FROM Waits AS W1
INNER JOIN Waits AS W2
ON W2.rn <= W1.rn
GROUP BY W1.rn, W1.wait_type, W1.wait_time_s, W1.pct
HAVING SUM(W2.pct) - W1.pct < 99 OPTION (RECOMPILE);
Also pls see the link
http://technet.microsoft.com/en-us/library/dd672789(v=sql.100).aspx
vt
Please mark answered if I've answered your question and vote for it as helpful to help other user's find a solution quicker

Error while running the sql queries in unix as cron job..

Hi,
I've configured some sql queries to run as cronjob from unix,i'm able to excute all the sql queries with out any error,after all the queries are executed,I'm getting the following error message.
ORA-00600: internal error code, arguments: [4080], [1], [131], [], [], [], [],
Could any one advise me why this error is being thrown?
How to avoid this error?
Thanks,
Anil

Are you running these queries through TopLink?
If so, the error seems to be occurring on the database, when the query is being executed.
I have never seen that error before. Performing some websearches it seems to be a general database error, potentially something to do with synchronization. Sorry I can't be of more help, perhaps the database forum can provide more insight...

Sql query slowness due to rank and columns with null values:


Sql query slowness due to rank and columns with null values:
I have the following table in database with around 10 millions records:
Declaration:
create table PropertyOwners (
[Key] int not null primary key,
PropertyKey int not null,
BoughtDate DateTime,
OwnerKey int null,
GroupKey int null
go
[Key] is primary key and combination of PropertyKey, BoughtDate, OwnerKey and GroupKey is unique.
With the following index:
CREATE NONCLUSTERED INDEX [IX_PropertyOwners] ON [dbo].[PropertyOwners]
[PropertyKey] ASC,
[BoughtDate] DESC,
[OwnerKey] DESC,
[GroupKey] DESC
go
Description of the case:
For single BoughtDate one property can belong to multiple owners or single group, for single record there can either be OwnerKey or GroupKey but not both so one of them will be null for each record. I am trying to retrieve the data from the table using
following query for the OwnerKey. If there are same property rows for owners and group at the same time than the rows having OwnerKey with be preferred, that is why I am using "OwnerKey desc" in Rank function.
declare @ownerKey int = 40000
select PropertyKey, BoughtDate, OwnerKey, GroupKey
from (
select PropertyKey, BoughtDate, OwnerKey, GroupKey,
RANK() over (partition by PropertyKey order by BoughtDate desc, OwnerKey desc, GroupKey desc) as [Rank]
from PropertyOwners
) as result
where result.[Rank]=1 and result.[OwnerKey]=@ownerKey
It is taking 2-3 seconds to get the records which is too slow, similar time it is taking as I try to get the records using the GroupKey. But when I tried to get the records for the PropertyKey with the same query, it is executing in 10 milliseconds.
May be the slowness is due to as OwnerKey/GroupKey in the table can be null and sql server in unable to index it. I have also tried to use the Indexed view to pre ranked them but I can't use it in my query as Rank function is not supported in indexed
view.
Please note this table is updated once a day and using Sql Server 2008 R2. Any help will be greatly appreciated.

create table #result (PropertyKey int not null, BoughtDate datetime, OwnerKey int null, GroupKey int null, [Rank] int not null)Create index idx ON #result(OwnerKey ,rnk)
insert into #result(PropertyKey, BoughtDate, OwnerKey, GroupKey, [Rank])
select PropertyKey, BoughtDate, OwnerKey, GroupKey,
RANK() over (partition by PropertyKey order by BoughtDate desc, OwnerKey desc, GroupKey desc) as [Rank]
from PropertyOwners
go
declare @ownerKey int = 1
select PropertyKey, BoughtDate, OwnerKey, GroupKey
from #result as result
where result.[Rank]=1
and result.[OwnerKey]=@ownerKey
go
Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
MS SQL optimization: MS SQL Development and Optimization
MS SQL Consulting:
Large scale of database and data cleansing
Remote DBA Services:
Improves MS SQL Database Performance
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Business Intelligence

Need help in SQL Queries using GUI controls or variables

Hello, all
I have a big problem (I have already had with Visual Basic a few mounths ago) with Java while writing my SQL Queries.
I would like to know how I must do to use variable data or GUI control data in my SQL Query to select only some records.
Here, my first Query that works without any problem (no WHERE clause !!!) :
Statement requeteBedes = connectBedes.createStatement();
ResultSet resultatSeries = requeteBedes.executeQuery("SELECT * FROM Series");
initComboBoxSeries(resultatSeries);the method "initComboBoxSeries" fills a JComboBox with all the names of the series in my database.
Here comes my problem.I would like to use the value of the selected "series" in the JComboBox to search in another table of the same Database. I made another statement but it returns a Null ResultSet :
ResultSet resultatSearchAlbumsFromSeries = requeteBedes.executeQuery("SELECT * FROM bandes_dess WHERE ser_nom = '" + strComboBoxSeriesSelected + "' "); The variable strComboBoxSeriesSelected contains the value of the selected line in the combobox with all the series, filled after the first query that is here above and that works very well.
Could some one help me and tell me how I must use variables or GUI controls values in my SQL Queries or tell me if there is a place where I could find an explanation of that kind of problems (like more "advanced SQL Queries", as the ones currently used in all the Learning Java 2 books)
Thank you all for your help.
Christian.

executeQuery() will never return null. At least that's what the spec says. You are probably catching an exception (probably a syntax error caused by a single quote in strComboBoxSeriesSelected) and ignoring it. Or do you mean the ResultSet contains no rows?
Anyway, to use parameterized queries, take a look at PreparedStatements. Your code should look like this using PreparedStatement:Statement requeteBedes = connectBedes.prepareStatement("SELECT * FROM bandes_dess WHERE ser_nom = ?");
requeteBedes.setString(1, strComboBoxSeriesSelected);
ResultSet resultatSeries = requeteBedes.executeQuery();Alin.

Ruby code for sql queries

Hello everybody,
First off, let me apologize if my inquiry does not belong on this forum. I am confident however, that someone here has had experience with this since Oracle and ruby on rails/ruby are used frequently. My fingers are crossed, here's is my problem:
I am currently working on a database system that utilizes ruby on rails
with a oracle database. Here's the situation:
the ruby on rails web application is up and running;
my oracle database is full of tables that are populated with data;
there is a successful connection between rails and my oracle database;
however, what isn't finished is I currently have data mining queries in
sql (eg. find minimum time someone has been employed = "Select
min(time) from table...etc") and what I need to do is write one ruby
program for each of my sql queries so that the ruby program:
1) connects to the oracle database each time the query is called
2) runs the sql query on the oracle database
3) takes the results from the query and returns them in an array or
something of that nature (so that I can use the results in an html file
on the ruby on rails web application).
Again, I apologize if this question does not belong on this forum. If someone however has experience with this could you please give me example code of what this would look like (using different sql queries). Thank you

I apologize if this question does not belong on this forum. OTN does have a forum dedicated to Ruby/Ruby On Rails. I admit it doesn't seem to get much traffic. I think that's because most people working with Ruby tend to go for F/OSS products.
Cheers, APC
Blog : http://radiofreetooting.blogspot.com/

Sql queries - slow database

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