Performance Problem in Procedure
Hello All,
Env: 10gR2 on Solaris
I have a procedure in my TEST and PROD. In TEST it takes around 5 secs and in PROD it takes around 40 secs.
I put a trace on both.
PROD*
OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 39.74 38.81 0 0 0 1
Fetch 0 0.00 0.00 0 0 0 0
total 2 39.74 38.81 0 0 0 1
Misses in library cache during parse: 0
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
log file sync 2 0.00 0.00
SQL*Net message to client 2 0.00 0.00
SQL*Net message from client 2 12.16 12.17
TEST*
OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 5.72 5.63 0 0 0 1
Fetch 0 0.00 0.00 0 0 0 0
total 2 5.72 5.63 0 0 0 1
Misses in library cache during parse: 0
Elapsed times include waiting on following events:
Event waited on Times Max. Wait Total Waited
log file sync 2 0.05 0.05
SQL*Net message to client 2 0.00 0.00
SQL*Net message from client 2 3.72 3.74The cost is more while its run on the prod.
The trace file shows many sql's, almost all the tables used are tables of very small (count = 9 or 30 etc).
The plan for most the sql's are same in both DB's, but the time taken per step is more in PROD.
One the sql is below.
PROD*
DELETE FROM GTT_REPAYMENT_SCHEDULE
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 2 0.00 0.00 0 3 1 1
Fetch 0 0.00 0.00 0 0 0 0
total 3 0.00 0.00 0 3 1 1
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 118 (recursive depth: 1)
Rows Row Source Operation
0 DELETE GTT_REPAYMENT_SCHEDULE (cr=3 pr=0 pw=0 time=429 us)
1 TABLE ACCESS FULL GTT_REPAYMENT_SCHEDULE (cr=3 pr=0 pw=0 time=161 us)
TEST*
DELETE FROM GTT_REPAYMENT_SCHEDULE
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 2 0.00 0.00 0 3 1 1
Fetch 0 0.00 0.00 0 0 0 0
total 3 0.00 0.00 0 3 1 1
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 64 (recursive depth: 1)
Rows Row Source Operation
0 DELETE GTT_REPAYMENT_SCHEDULE (cr=3 pr=0 pw=0 time=276 us)
1 TABLE ACCESS FULL GTT_REPAYMENT_SCHEDULE (cr=3 pr=0 pw=0 time=112 us)The 'time' varies in both the plans, what is this *'us'*. How many 'us' is 1 second ?
Its the same for all the sql's. The 'time' varies largely.
How would i improve the performance in Prod. Any clue?
TIA,
JJ
Hi,
I have removed all the DBMS_OUTPUT lines and executed. But there isn't any difference.
I have uploaded the trace Prod without DBMS_OUTPUT : http://biscut.wordpress.com/2008/10/17/trace-in-prod-without-dbms_output/
gejcllcal_jw_100_01 is a procedure which is called in my plsql, which in turn calls a couple of procs
Procedure :http://biscut.wordpress.com/2008/10/17/procedure/
As you said, if the total execution time comes only until 1.12 secs, what constitutes the rest? :(
TIA,
JJ
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I am using Oracle 8i.
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The skeleton of the code which we have written looks like this
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Thanks
Ashwin N.Do this intead of ditching the PL/SQL.
DECLARE
TYPE NumTab IS TABLE OF NUMBER(4) INDEX BY BINARY_INTEGER;
TYPE NameTab IS TABLE OF CHAR(15) INDEX BY BINARY_INTEGER;
pnums NumTab;
pnames NameTab;
t1 NUMBER(5);
t2 NUMBER(5);
t3 NUMBER(5);
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Hi,
I am looking for inputs in tuning stored procedure using sql server 2008. l am new to performance tuning in sql,plsql and oracle. currently facing issue in stored procedure - need to increase the performance by code optmization/filtering the records using where clause in larger table., the requirement is Stored procedure generate Audit Report which is accessed by approx. 10 Admin Users typically 2-3 times a day by each Admin users.
It has got CTE ( common table expression ) which is referred 2 time within SP. This CTE is very big and fetches records from several tables without where clause. This causes several records to be fetched from DB and then needed processing. This stored procedure is running in pre prod server which has 6gb of memory and built on virtual server and the same proc ran good in prod server which has 64gb of ram with physical server (40sec). and the execution time in pre prod is 1min 9seconds which needs to be reduced upto 10secs or so will be the solution. and also the exec time differs from time to time. sometimes it is 50sec and sometimes 1min 9seconds..
Pl provide what is the best option/practise to use where clause to filter the records and tool to be used to tune the procedure like execution plan, sql profiler?? I am using toad for sqlserver 5.7. Here I see execution plan tab available while running the SP. but when i run it throws an error. Pl help and provide inputs.
Thanks,
VijiYou've asked a SQL Server question in an Oracle forum. I'm expecting that this will get locked momentarily when a moderator drops by.
Microsoft has its own forums for SQL Server, you'll have more luck over there. When you do go there, however, you'll almost certainly get more help if you can pare down the problem (or at least better explain what your code is doing). Very few people want to read hundreds of lines of code, guess what's it's supposed to do, guess what is slow, and then guess at how to improve things. Posting query plans, the results of profiling, cutting out any code that is unnecessary to the performance problem, etc. will get you much better answers.
Justin -
How to avoid performance problems in PL/SQL?
How to avoid performance problems in PL/SQL?
As per my knowledge, below some points to avoid performance proble in PL/SQL.
Is there other point to avoid performance problems?
1. Use FORALL instead of FOR, and use BULK COLLECT to avoid looping many times.
2. EXECUTE IMMEDIATE is faster than DBMS_SQL
3. Use NOCOPY for OUT and IN OUT if the original value need not be retained. Overhead of keeping a copy of OUT is avoided.Susil Kumar Nagarajan wrote:
1. Group no of functions or procedures into a PACKAGEPutting related functions and procedures into packages is useful from a code organization standpoint. It has nothing whatsoever to do with performance.
2. Good to use collections in place of cursors that do DML operations on large set of recordsBut using SQL is more efficient than using PL/SQL with bulk collects.
4. Optimize SQL statements if they need to
-> Avoid using IN, NOT IN conditions or those cause full table scans in queriesThat is not true.
-> See to queries they use Indexes properly , sometimes Leading index column is missed out that cause performance overheadAssuming "properly" implies that it is entirely possible that a table scan is more efficient than using an index.
5. use Oracle HINTS if query can't be further tuned and hints can considerably help youHints should be used only as a last resort. It is almost certainly the case that if you can use a hint that forces a particular plan to improve performance that there is some problem in the underlying statistics that should be fixed in order to resolve issues with many queries rather than just the one you're looking at.
Justin -
Hi, I'm having a performance problem I cannot solve, so I'm hoping anyone here has some advice.
Our system consists of a central database server, and many applications (on various servers) that connect to this database.
Most of these applications are older, legacy applications.
They use a special mechanism for concurrency that was designed, also a long time ago.
This mechanism requires the applications to lock a specific table with a TABLOCKX before making any changes to the database (in any table).
This is of course quite nasty as it essentially turns the database into single user mode, but we are planning to phase this mechanism out.
However, there is too much legacy code to simply migrate everything right away, so for the time being we're stuck with it.
Secondly, this central database may not become too big because the legacy applications cannot cope with large amounts of data.
So, a 'cleaning' mechanism was implemented to move older data from the central database to a 'history' database.
This cleaning mechanism was created in newer technology; C# .NET.
It is actually a CLR stored procedure that is called from a SQL job that runs every night on the history server.
But, even though it is new technology, the CLR proc *must* use the same lock as the legacy applications because they all depend on the correct use of this lock.
The cleaning functionality is not a primary process, so it does not have high priority.
This means that any other application should be able to interrupt the cleaning and get handled by SQL first.
Therefore, we designed the cleaning so that it cleans as few data as possible per transaction, so that any other process can get the lock right after committing each cleaning transaction.
On the other hand, this means that we do have a LOT of small transactions, and because each transaction is distributed, they are expensive and so it takes a long time for the cleaning to complete.
Now, the problem: when we start the cleaning process, we notice that the CPU shoots up to 100%, and other applications are slowed down excessively.
It even caused one of our customer's factories to shut down!
So, I'm wondering why the legacy applications cannot interrupt the cleaning.
Every cleaning transaction takes about 0.6 seconds, which may seem long for a single transaction, but this also means any other application should be able to interrupt within 0,6 seconds.
This is obviously not the case; it seems the cleaning session 'steals' all of the CPU, or for some reason other SQL sessions are not handled anymore, or at least with serious delays.
I was thinking about one of the following approaches to solve this problem:
1) Add waits within the CLR procedure, after each transaction. This should lower the CPU, but I have no idea whether this will allow the other applications to interrupt sooner. (And I really don't want the factory to shut down twice!)
2) Try to look within SQL Server (using DMV's or something) and see whether I can determine why the cleaning session gets more CPU. But I don't know whether this information is available, and I have no experience with DMV's.
So, to round up:
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- The cleaning statements themselves are already as simple as possible so I don't think more query tuning is possible.
- I don't think it's possible to tell SQL Server that specific SQL statements have low priority.
Can anyone offer some advice on how to handle this?
Regards,
StefanHi Stefan,
Have you solved this issue after follow up Bob's suggestion? I’m writing to follow up with you on this post, please let us know how things go.
If you have any feedback on our support, please click
here.
Elvis Long
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Performance Problem, RPC Call auf SQLServer 2000
Hi,
we have a performance problem with SQLServer 2000. We use Bea WLS 6.1, SQLServer
2000, and JDBC Driver mssqlserver4v65.jar from Bea.
we use this for performance optimization as in Documetation at
"http://www.datadirect-technologies.com/download/docs/jdbc/Jdbcref/jdbcdesign.html"
case 2
Stored Procedure can be optimized to use a server-side RPC. Because the application
calls the procedure by name and the argument values are already encoded, the load
on the database server is less
CallableStatement cstmt = conn.prepareCall ("Call getCustName (?)");
cstmt.setLong (1,12345);
ResultSet rs = cstmt.executeQuery();
But the checking in the SQlServer 2000 with SQL Profiler don't show the use of
RPC Call.
I can test the different from Query Analyser:
exec IF_GetBueroStatistik 1 -> SQLProfiler: SQL:BatchCompleted
{call IF_GetBueroStatistik(1)} -> SQlProfiler: RPC:Completed
But the Call from Bea Aplication make in SQlProfiler alwasy SQl:BatchCompleted.
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is that a bug in the driver implementation?
can any help me with a solution or workaround?
thanks HalimHi,
thank you very much Joe.
Halim.
Joseph Weinstein <[email protected]> wrote:
>
>
Halim wrote:
Hi,
we have a performance problem with SQLServer 2000. We use Bea WLS 6.1,SQLServer
2000, and JDBC Driver mssqlserver4v65.jar from Bea.You shouldn't be using the 6.5 version of the driver anyway. The 7.0
version is better,
but what you are seeing is that our driver does send fresh SQL for PreparedStatements,
which is not as fast as using the RPC protocol. It's not a bug, but it
is a feature we didn't
implement.
You should probably download and use the free driver from MS. It does
implement
the procedure protocol.
Joe
we use this for performance optimization as in Documetation at
"http://www.datadirect-technologies.com/download/docs/jdbc/Jdbcref/jdbcdesign.html"
case 2
Stored Procedure can be optimized to use a server-side RPC. Becausethe application
calls the procedure by name and the argument values are already encoded,the load
on the database server is less
CallableStatement cstmt = conn.prepareCall ("Call getCustName (?)");
cstmt.setLong (1,12345);
ResultSet rs = cstmt.executeQuery();
But the checking in the SQlServer 2000 with SQL Profiler don't showthe use of
RPC Call.
I can test the different from Query Analyser:
exec IF_GetBueroStatistik 1 -> SQLProfiler: SQL:BatchCompleted
{call IF_GetBueroStatistik(1)} -> SQlProfiler: RPC:Completed
But the Call from Bea Aplication make in SQlProfiler alwasy SQl:BatchCompleted.
The RPC ist faster from the Batch call.
is that a bug in the driver implementation?
can any help me with a solution or workaround?
thanks Halim -
Performance Problem - MS SQL 2K and PreparedStatement
Hi all
I am using MS SQL 2k and used PreparedStatement to retrieve data. There is strange and serious performance problem when the PreparedStatement contains "?" and using PreparedStatement.setX() functions to set its value. I have performed the test with the following code.
for (int i = 0; i < 10; i ++) {
try {
con = DBConnection.getInstance();
statement = con.prepareStatement("SELECT * FROM cardno WHERE car_no = '" + cardNo + "'");
// statement = con.prepareStatement("SELECT * FROM cardno WHERE car_no = ?");
// statement.setString(1, cardNo);
rs = statement.executeQuery();
if (rs.next()) {
catch(SQLException e) {
e.printStackTrace();
finally {
try {
rs.close();
statement.close();
catch(SQLException e) {
e.printStackTrace();
Iteration Time (ms)
1 961
10 1061
200 1803
for (int i = 0; i < 10; i ++) {
try {
con = DBConnection.getInstance();
// statement = con.prepareStatement("SELECT * FROM cardno WHERE car_no = '" + cardNo + "'");
statement = con.prepareStatement("SELECT * FROM cardno WHERE car_no = ?");
statement.setString(1, cardNo);
rs = statement.executeQuery();
if (rs.next()) {
catch(SQLException e) {
e.printStackTrace();
finally {
try {
rs.close();
statement.close();
catch(SQLException e) {
e.printStackTrace();
Iteration Time (ms)
1 1171
10 2754
100 18817
200 36443
The above test is performed with DataDirect JDBC 3.0 driver. The one uses ? and setString functions take much longer to execute, which supposed to be faster because of precompilation of the statement.
I have tried different drivers - the one provided by MS, data direct and Sprinta JDBC drivers but all suffer the same problem in different extent. So, I am wondering if MS SQL doesn't support for precompiled statement and no matter what JDBC driver I used I am still having the performance problem. If so, many O/R mappings cannot be used because I believe most of them if not all use the precompiled statement.
Best regards
EdmondEdmond,
Most JDBC drivers for MS SQL (and I think this includes all the drivers you tested) use sp_executesql to execute PreparedStatements. This is a pretty good solution as the driver doesn't have to keep any information about the PreparedStatement locally, the server takes care of all the precompiling and caching. And if the statement isn't already precompiled, this is also taken care of transparently by SQL Server.
The problem with this approach is that all names in the query must be fully qualified. This means that the driver has to parse the query you are submitting and make all names fully qualified (by prepending a db name and schema). This is why creating a PreparedStatement takes so much using these drivers (and why it does so every time you create it, even though it's the same PreparedStatement).
However, the speed advantage of PreparedStatements only becomes visible if you reuse the statement a lot of times.
As about why the PreparedStatement with no placeholder is much faster, I think is because of internal optimisations (maybe the statement is run as a plain statement (?) ).
As a conclusion, if you can reuse the same PreparedStatement, then the performance hit is not so high. Just ignore it. However, if the PreparedStatement is created each time and only used a few times, then you might have a performance issue. In this case I would recommend you try out the jTDS driver ( http://jtds.sourceforge.net ), which uses a completely different approach: temporary stored procedures are created for PreparedStatements. This means that no parsing is done by the driver and PreparedStatement caching is possible (i.e. the next time you are preparing the same statement it will take much less as the previously submitted procedure will be reused).
Alin. -
Performance problem while CPU is 80% Idel ?
Hi,
My end users are claim for performance problem during execution of batch process.
As you can see there are 1,745 statement executing each second.
Awr report shows 98.1% of the time , waits on CPU .
Also Awr report shows that Host CPU is :79.9% Idel.
The second wait event shows only 212 seconds waits on db file sequential read.
Yet , 4 minute in 1 hour period is seems not an issue.
Please advise
DB Name DB Id Instance Inst Num Startup Time Release RAC
QERP xxx erp 1 21-Jan-13 15:40 11.2.0.2.0 ; NO
Host Name Platform CPUs Cores Sockets Memory(GB)
erptst HP-UX IA (64-bit) 16 16 4 127.83
Snap Id Snap Time Sessions Curs/Sess
Begin Snap: 40066 22-Jan-13 20:00:52 207 9.6
End Snap: 40067 22-Jan-13 21:00:05 210 9.6
Elapsed: 59.21 (mins)
DB Time: 189.24 (mins)
Cache Sizes Begin End
~~~~~~~~~~~ ---------- ----------
Buffer Cache: 8,800M 8,800M Std Block Size: 8K
Shared Pool Size: 1,056M 1,056M Log Buffer: 49,344K
Load Profile Per Second Per Transaction Per Exec Per Call
~~~~~~~~~~~~ --------------- --------------- ---------- ----------
DB Time(s): 3.2 ; 0.1 ; 0.00 ; 0.05
DB CPU(s): 3.1 ; 0.1 ; 0.00 ; 0.05
Redo size: 604,285.1 ; 27,271.3
Logical reads: 364,792.3 ; 16,463.0
Block changes: 3,629.5 ; 163.8
Physical reads: 21.5 ; 1.0
Physical writes: 95.3 ; 4.3
User calls: 68.7 ; 3.1
Parses: 212.9 ; 9.6
Hard parses: 0.3 ; 0.0
W/A MB processed: 1.2 ; 0.1
Logons: 0.3 ; 0.0
Executes: 1,745.2 ; 78.8
Rollbacks: 1.2 ; 0.1
Transactions: 22.2
Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Buffer Nowait %: 100.00 ; Redo NoWait %: 100.00
Buffer Hit %: 99.99 ; In-memory Sort %: 100.00
Library Hit %: 99.95 ; Soft Parse %: 99.85
Execute to Parse %: 87.80 ; Latch Hit %: 99.99
Parse CPU to Parse Elapsd %: 74.76 ; % Non-Parse CPU: 99.89
Shared Pool Statistics Begin End
Memory Usage %: 75.37 ; 76.85
% SQL with executions>1: 95.31 ; 85.98
% Memory for SQL w/exec>1: 90.33 ; 82.84
Top 5 Timed Foreground Events
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Avg
wait % DB
Event Waits Time(s) (ms) time Wait Class
DB CPU 11,144 98.1
db file sequential read 52,714 214 4 1.9 User I/O
SQL*Net break/reset to client 29,050 6 0 .1 Applicatio
log file sync 2,536 6 2 .0 Commit
buffer busy waits 4,338 2 1 .0 Concurrenc
Host CPU (CPUs: 16 Cores: 16 Sockets: 4)
~~~~~~~~ Load Average
Begin End %User %System %WIO %Idle
0.34 ; 0.33 ; 19.7 ; 0.4 ; 1.8 ; 79.9Nikolay Savvinov wrote:
if the users are complaining about performance of the batch process, then that's what you should be looking at, not the entire system.I find it strange to see "end users" and "the batch process" in the same sentence (as it was in the first post). "End users" gives me the feeling of a significant number of concurrent sessions with people waiting for results in real time at the far end, while "batch process" carries the image a small number of large scale processes running overnight to prepare the data for the following morning.
I mention this because my first view of the AWR output was: you've got 16 CPUs, only three in use, virtually no users, and doing very little work, how can the users complain. (One answer, of course, is that the 13 CPUs could be locked out of use as far as Oracle is concerned). On the second read I decided that the "users" had gone home, and the complaint was simply that the batch process wasn't completing in time.
In this case I think "the entire system" IS "the batch process"
Determine which stored procedures and/or SQL statements took longer than usual and then find out why. Most likely you'll be able to find
everything you need in AWR views (DBA_HIST_SQL%) and ASH archive (DBA_HIST_ACTIVE_SESS_HISTORY).
If the batch process has changed dramatically and recently, then a simple first step might be to look at the current AWR report, find the few most time-consuming SQL statements, and use the awrsqrpt.sql script to find their history of execution plans.
But I'd also just look at the expensive SQL - bearing in mind, particularly, that there are very few user calls per second, yet many hundred executions per second: it strikes me that there could be quite a lot of PL/SQL going on doing something a little bit expensive many times or some PL/SQL function that calls some SQL that used to be called rarely from an SQL statement but is now (due, perhaps to a change in plan) being called much more frequently - so check SQL Ordered by Executions.
Regards
Jonathan Lewis -
JDBC performance problem with Blob
Hi,
I've some performance problem while inserting Blob in an Oracle
8i database. I'm using JVM 1.17 on HP-UX 11.0 with Oracle thin
client
The table I used contains only two columns : an integer (the
primary key) and a blob.
First I insert a row in the table with an empty_blob()
Then I select back this row to get the blob
and finally I fill in the blob with the data.
But it takes an average 4.5 seconds to insert a blob of 47 Kb.
Am I doing something wrong?
Any suggestion or hint will be welcome.
Thanks in advance
Didier
nullDon S. (guest) wrote:
: Didier Derck (guest) wrote:
: : Hi,
: : I've some performance problem while inserting Blob in an
Oracle
: : 8i database. I'm using JVM 1.17 on HP-UX 11.0 with Oracle
thin
: : client
: : The table I used contains only two columns : an integer (the
: : primary key) and a blob.
: : First I insert a row in the table with an empty_blob()
: : Then I select back this row to get the blob
: : and finally I fill in the blob with the data.
: : But it takes an average 4.5 seconds to insert a blob of 47
Kb.
: : Am I doing something wrong?
: : Any suggestion or hint will be welcome.
: : Thanks in advance
: : Didier
: In our testing if you use blob.putBytes() you will get better
: performance. The draw back we found was the 32k limit we ran
in
: to. We had to chunk things larger than that and make calls to
: the append method. I was dissappointed in Oracle's phone
support
: on what causes the 32k limit. In addition the getBytes() for
: retrieve doesn't seem to work. You'll have to use the
: InputStream for that. Oh, and FYI. We ran into a 2k limit on
: putChars() for CLOB's.
the thin drivers currently use the package "dbms_lob" behind the
scenes while the jdbc oci 815 drivers and higher uses the native
oci calls which makes them much faster.
there also is a 32k limit on pl/sql stored procedures/functions
for parms.
you may have run into that.
null -
Hello,
I have a Macbrook Pro Retina (late 2013) running Yosemite (I updated using the Appstore) with a lot of performance problems :
I can't write a text without frame drops
Showing the notification center takes a long time than usual
Opening finder is a hard task to do, it keeps showing parts of the window
I have a problem with the heat of the Macbook Pro, it doesn't go below 50° even if I'm not running anything at all while the ram the used at 80% all the time.
I can't open mail and chrome at the same time, it makes the macbook completely useless
... I can't do what I'm supposed to do using this Macbook Pro anymore...
Do you think that everyone is having the same problem ? is there any solution to downgrade to Mavericks ? I hate unfinished software, I feel like I'm using A copy of Android or Windows on a Mac,
Regards,
Reda,You have a botched installation probably due to a defective Mavericks installation that you updated. Since downgrading to Mavericks requires that you erase your hard drive, what you might try is to reinstall Yosemite using the Recovery HD:
Install or Reinstall Mavericks, Mountain Lion, or Lion from Scratch
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
OS X Mavericks- Erase and reinstall OS X
OS X Mountain Lion- Erase and reinstall OS X
OS X Lion- Erase and reinstall Mac OS X
Note: You will need an active Internet connection. I suggest using Ethernet if possible
because it is three times faster than wireless. -
Hello,
I've been having performance problems with one query using XMLAGG. Explain plan shows that all tables are joined using correct indexes - there is nothing wrong with it. After series of experiments with the query I found out that the problem is in use of XMLAGG function. It aggregates the data before submitting it to the result XML document.
I there any way to generate something like
<Main attr1="...">
<el1>...</el1>
<el2>...</el2>
<SubElement>
<row>row1 from the database</row>
<row>row2 from the database</row>
<row>rowN from the database</row>
</SubElement>
<Main>
without using XMLAGG in the subquery or somehow switch the aggregation off? I dont really need the records to be aggregated, all I need is to be able to generate multiple record based XML in the subquery which would have normally failed on (single-row query returned more than one record exception) without XMLAGG.
Thanks in advance
AlexeyTKPROF: Release 9.2.0.1.0 - Production on Wed Jan 31 15:21:34 2007
Copyright (c) 1982, 2002, Oracle Corporation. All rights reserved.
Trace file: lnsqd1_ora_7350_perfoamance_test_01.trc
Sort options: default
count = number of times OCI procedure was executed
cpu = cpu time in seconds executing
elapsed = elapsed time in seconds executing
disk = number of physical reads of buffers from disk
query = number of buffers gotten for consistent read
current = number of buffers gotten in current mode (usually for update)
rows = number of rows processed by the fetch or execute call
ALTER SESSION SET EVENTS '10046 trace name context forever, level 1'
call count cpu elapsed disk query current rows
Parse 0 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 0 0
Fetch 0 0.00 0.00 0 0 0 0
total 1 0.00 0.00 0 0 0 0
Misses in library cache during parse: 0
Optimizer goal: ALL_ROWS
Parsing user id: 113
create table tmp_003
as
select a.*, 'NEW ' as eventtype
from v_deal_xml a
where a.deal_id in
select a.pk_value
from da_history a, gx_type b
where a.evtime <= to_date('1/22/2007 12:59:26', 'MM/DD/RRRR HH24:MI:SS')
and a.type_id = b.type_id
and b.xmltype = 'GDP/DEAL'
and a.eventtype = 'NEW'
call count cpu elapsed disk query current rows
Parse 1 0.12 0.12 0 60 1 0
Execute 1 108.30 105.87 0 6343 1387 172
Fetch 0 0.00 0.00 0 0 0 0
total 2 108.42 106.00 0 6403 1388 172
Misses in library cache during parse: 1
Optimizer goal: ALL_ROWS
Parsing user id: 113
insert into tmp_003
select a.*, 'UPDATE' as eventtype
from v_deal_xml a
where a.deal_id in
select a.pk_value --b.xmltype, a.*
from da_history a, gx_type b
where a.evtime <= to_date('1/22/2007 12:59:26', 'MM/DD/RRRR HH24:MI:SS')
and a.type_id = b.type_id
and b.xmltype = 'GDP/DEAL'
and a.eventtype = 'UPDATE'
call count cpu elapsed disk query current rows
Parse 1 0.13 0.13 0 60 0 0
Execute 1 256.74 250.96 0 18752 3815 381
Fetch 0 0.00 0.00 0 0 0 0
total 2 256.87 251.09 0 18812 3815 381
Misses in library cache during parse: 1
Optimizer goal: ALL_ROWS
Parsing user id: 113
Rows Row Source Operation
381 NESTED LOOPS (cr=1194 pr=0 pw=0 time=26458 us)
381 VIEW VW_NSO_1 (cr=430 pr=0 pw=0 time=6665 us)
381 SORT UNIQUE (cr=430 pr=0 pw=0 time=6285 us)
381 MERGE JOIN (cr=430 pr=0 pw=0 time=3761 us)
1 TABLE ACCESS BY INDEX ROWID GX_TYPE (cr=2 pr=0 pw=0 time=67 us)
5 INDEX FULL SCAN XPKGX_TYPE (cr=1 pr=0 pw=0 time=24 us)(object id 71282)
381 SORT JOIN (cr=428 pr=0 pw=0 time=3698 us)
603 TABLE ACCESS FULL DA_HISTORY (cr=428 pr=0 pw=0 time=1339 us)
381 TABLE ACCESS BY INDEX ROWID DEAL (cr=764 pr=0 pw=0 time=16692 us)
381 INDEX UNIQUE SCAN DEAL_PK (cr=383 pr=0 pw=0 time=8926 us)(object id 71236)
commit
call count cpu elapsed disk query current rows
Parse 1 0.00 0.00 0 0 0 0
Execute 1 0.00 0.00 0 0 1 0
Fetch 0 0.00 0.00 0 0 0 0
total 2 0.00 0.00 0 0 1 0
Misses in library cache during parse: 0
Parsing user id: 113
OVERALL TOTALS FOR ALL NON-RECURSIVE STATEMENTS
call count cpu elapsed disk query current rows
Parse 3 0.25 0.25 0 120 1 0
Execute 4 365.04 356.84 0 25095 5203 553
Fetch 0 0.00 0.00 0 0 0 0
total 7 365.29 357.10 0 25215 5204 553
Misses in library cache during parse: 2
OVERALL TOTALS FOR ALL RECURSIVE STATEMENTS
call count cpu elapsed disk query current rows
Parse 83 0.01 0.01 0 0 0 0
Execute 125 0.03 0.03 0 108 201 46
Fetch 114 0.01 0.00 0 221 0 72
total 322 0.05 0.04 0 329 201 118
Misses in library cache during parse: 3
Misses in library cache during execute: 3
4 user SQL statements in session.
125 internal SQL statements in session.
129 SQL statements in session.
Trace file: lnsqd1_ora_7350_perfoamance_test_01.trc
Trace file compatibility: 9.00.01
Sort options: default
1 session in tracefile.
4 user SQL statements in trace file.
125 internal SQL statements in trace file.
129 SQL statements in trace file.
45 unique SQL statements in trace file.
11196 lines in trace file. -
Problem with procedure in package
Problem with procedure in package:
create table accounts
(acno number(10),
name varchar2(20),
balance number(10,2));
create package banking is
procedure new_acct(acno NUMBER, name IN VARCHAR);
procedure acct_dep(acno IN NUMBER, amount IN NUMBER);
procedure acc_wdr(acno IN NUMBER, amount IN NUMBER);
procedure acc_bal(acno IN NUMBER, bal OUT NUMBER);
function acc_drwn(acno IN NUMBER) RETURN BOOLEAN;
end banking;
create or replace package body banking is
procedure new_acct ( acno IN number,
name IN varchar) is
begin
insert into accounts
(acno, name, balance)
values
(acno, name,0);
end;
procedure acct_dep(acno IN NUMBER,
amount IN NUMBER) is
begin
update accounts
set balance = balance + amount
where acno = acno;
end;
procedure acc_wdr(acno IN NUMBER,
amount IN NUMBER) is
begin
update accounts
set balance = balance - amount
where acno = acno;
end;
procedure acc_bal(acno IN NUMBER,
bal OUT NUMBER) is
begin
declare cursor c_balance(i_acno IN accounts.acno%type) is
select balance
from accounts
where acno = i_acno;
acc_bal accounts.balance%type;
begin
if c_balance%isopen then
close c_balance;
end if;
open c_balance(acno);
fetch c_balance into acc_bal;
close c_balance;
end;
end;
function acc_drwn(acno IN NUMBER) RETURN BOOLEAN is
begin
declare cursor c_balance(i_acno IN accounts.acno%type) is
select balance
from accounts
where acno = i_acno;
bal accounts.balance%type;
begin
if c_balance%isopen then
close c_balance;
end if;
open c_balance(acno);
fetch c_balance into bal;
close c_balance;
if bal < 0 then
return true;
else
return false;
end if;
end;
end;
end banking;
begin
banking.new_acct(123,'FRANKS');
end;
execute banking.acct_dep(123,100);
execute banking.acc_wdr(123,50);
Works fine up to this point, however when running the balance check the balance amount is not visible?
SQL> set serveroutput on
SQL> begin
2 declare
3 bal accounts.balance%type;
4 begin
5 banking.acc_bal(123,bal);
6 dbms_output.put_line('Franks balance is '||bal);
7 end;
8 end;
9 /procedure acc_bal(acno IN NUMBER,
bal OUT NUMBER)
is
cursor c_balance(i_acno IN accounts.acno%type) is
select balance
from accounts
where acno = i_acno;
l_acc_bal accounts.balance%type;
begin
open c_balance(acno);
fetch c_balance into l_acc_bal;
close c_balance;
bal := l_acc_bal;
end; -
Performance problem in Zstick report...
Hi Experts,
I am facing performance problem in Custoom Stock report of Material Management.
In this report i am fetching all the materials with its batches to get the desired output, at a time this report executes 36,000 plus unique combination of material and batch.
This report takes around 30 mins to execute. And this report is to be viewed regularly in every 2 hours.
To read the batch characteristics value I am using FM -> '/SAPMP/CE1_BATCH_GET_DETAIL'
Is there any way out to increase the performance of this report, the output of the report is in ALV.
May i have any refresh button in the report so that data may get refreshed automatically without executing it again. or is there any cache memory concept.
Note: I have declared all the itabs with type sorted, all the select queries are fetched with key and index.
Thanks
Rohit GharwarHello,
SE30 is old. Switch on trace on ST12 while running this progarm and identify where exactly most of the time is being spent. If you see high CPU time this problem with the ABAP code. You can exactly figure out the program/function module from ST12 trace where exactly time is being spent. If you see high database time in ST12, problem is with database related issue. So basically you have to analyze sql statement from performance traces in ST12. These could resolve your issue.
Yours Sincerely
Dileep -
SQL report performance problem
I have a SQL classic report in Apex 4.0.2 and database 11.2.0.2.0 with a performance problem.
The report is based on a PL/SQL function returning a query. The query is based on a view and pl/sql functions. The Apex parsing schema has select grant on the view only, not the underlying objects.
The generated query runs in 1-2 sec in sqlplus (logged in as the Apex parsing schema user), but takes many minutes in Apex. I have found, by monitoring the database sessions via TOAD, that the explain plan in the Apex and sqlplus sessions are very different.
The summary:
In sqlplus SELECT STATEMENT ALL_ROWS Cost: 3,695
In Apex SELECT STATEMENT ALL_ROWS Cost: 3,108,551
What could be the cause of this?
I found a blog and Metalink note about different explain plans for different users. They suggested to set optimizer_secure_view_merging='FALSE', but that didn't help.Hmmm, it runs fast again in SQL Workshop. I didn't expect that, because both the application and SQL Workshop use SYS.DBMS_SYS_SQL to parse the query.
Only the explain plan doesn't show anything.
To add: I changed the report source to the query the pl/sql function would generate, so the selects are the same in SQL Workshop and in the application. Still in the application it's horribly slow.
So, Apex does do something different in the application compared to SQL Workshop.
Edited by: InoL on Aug 5, 2011 4:50 PM -
Performance problem with WPF Viewer CRVS2010
Hi,
We are using Crystal Reports 2010 and the new WPF Viewer. Last week when we set up a test machine to run our integration tests (several hundred) all report tests failed (about 30 tests) with a timeout exception.
The testmachine setup:
HP DL 580 G5
WMWare ESXi 4.0
Guest OS: Windows 7 Enterprise 64-bit
Memory (guest OS): 3GB
CPU: 1
Visual Studio 2010
Crystal Reports for Visual Studio 2010 with 64 bit runtime installed
Visual Studio 2008 installed
Microsoft Office 2010 installed
Macafee antivirus
There are about 10 other virtual machines on the same HW.
I think the performance problem is related to text obejcts on a report document viewed in a WPF Viewer. I made a simple WPF GUI with 2 buttons and the first button executes a very simple report that only has a text object with a few words in it and the other button is also a simple report with only 1 text object with approx. 100 words (about 800 charchters).
The first report executes and displays almost instantly and the second report executes instantantly but displays after approx. 1 min 30 sec.
And execute in this context means that all VB.Net code runs in the compiler without any exception or performance problem. The performance problem seems to come after viewer.Show() (in the code below) has executed.
I did another test on the second report and replaced the text obejct with a formula field with the same text as the text object and this test executed and displayed the report instantly.
So the performance problem seems to have something to do with rendering of textobjects in the WPF Viewer on a virtual machine with the above setup.
I've made several tests on local machines with Windows XP (32 bit) or Winows 7 (64 bit) installed and none of them have this performance problem. Its not a critical issue for us because our users will run this application on their local PCs with Windows 7 64-bit but its a bit problematic for our project not being able to run all of our integration tests but I will probably solve this by using a local PC instead.
Here is the VB.Net code Im using to View the reports:
Private Sub LightWeight_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
Dim lightWeightReport As New CrystalDecisions.CrystalReports.Engine.ReportDocument
lightWeightReport.Load(Environment.CurrentDirectory & "\LightWeight.rpt")
' Initialize Viewer
Dim viewer As LF.LIV.PEAAT.Crystal.Views.ReportViewer = New LF.LIV.PEAAT.Crystal.Views.ReportViewer()
viewer.Owner = Me
viewer.reportViewer.ViewerCore.ReportSource = lightWeightReport
viewer.Show()
End Sub
Private Sub LightWeightSlow_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs)
Dim lightWeightReport As New CrystalDecisions.CrystalReports.Engine.ReportDocument
lightWeightReport.Load(Environment.CurrentDirectory & "\LightWeightSlow.rpt")
' Initialize Viewer
Dim viewer As LF.LIV.PEAAT.Crystal.Views.ReportViewer = New LF.LIV.PEAAT.Crystal.Views.ReportViewer()
viewer.Owner = Me
viewer.reportViewer.ViewerCore.ReportSource = lightWeightReport
viewer.Show()
End Sub
The reports are 2 empty default reports with only 1 textobject on the details section.
// ThomasSee if the KB [
[1448013 - Connecting to Oracle database. Error; Failed to load database information|http://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes_boj/sdn_oss_boj_bi/sap(bD1lbiZjPTAwMQ==)/bc/bsp/spn/scn_bosap/notes%7B6163636573733d36393736354636443646363436353344333933393338323636393736354637333631373036453646373436353733354636453735364436323635373233443330333033303331333433343338333033313333%7D.do] helps.
Also the following may not hurt to have a look at (if only for ideas):
[1217021 - Err Msg: "Unable to connect invalid log on parameters" using Oracle in VS .NET|http://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes_boj/sdn_oss_boj_bi/sap(bD1lbiZjPTAwMQ==)/bc/bsp/spn/scn_bosap/notes%7B6163636573733d36393736354636443646363436353344333933393338323636393736354637333631373036453646373436353733354636453735364436323635373233443330333033303331333233313337333033323331%7D.do]
[1471508 - Logon error when connecting to Oracle database in a VS .NET application|http://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes_boj/sdn_oss_boj_bi/sap(bD1lbiZjPTAwMQ==)/bc/bsp/spn/scn_bosap/notes%7B6163636573733d36393736354636443646363436353344333933393338323636393736354637333631373036453646373436353733354636453735364436323635373233443330333033303331333433373331333533303338%7D.do]
[1196712 - Error: "Failed to load the oci.dll" in ASP.NET application against an Oracle database|http://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes_boj/sdn_oss_boj_bi/sap(bD1lbiZjPTAwMQ==)/bc/bsp/spn/scn_bosap/notes%7B6163636573733d36393736354636443646363436353344333933393338323636393736354637333631373036453646373436353733354636453735364436323635373233443330333033303331333133393336333733313332%7D.do]
Ludek
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