help kindly scenario performance
My requirment is simple(1) I have table with 10 crore data records
2) there are 30 columns
(3) I add 1 more columns with the name "PAVILION".
(4) if the individual has 10 columns set to zero then update the flag with TRUE column
pls help
S
Published by: oraclehema on July 7, 2011 23:02
OK, I really strongly suggest that you do not store the flag on the table
We have all these indicators and flags on the tables where I work and their maintenance
is a nightmare.
It would be so much better to just drift indicator or indicator as needed by using a view, regardless of the function.
However if you really have to put this flag on the table you need a trigger to keep it.
This script should add column, relaxation and then update the appropriate indicator.
/* Formatted on 7/7/2011 9:15:46 AM (QP5 v5.149.1003.31008) */
ALTER TABLE
crore_data
ADD
flag NUMBER(1);
ALTER TABLE crore_data
ADD CONSTRAINT check_flag
CHECK (NVL(flag,0) BETWEEN 0 AND 1);
CREATE OR REPLACE TRIGGER crore_data
BEFORE INSERT or UPDATE
ON crore_data
FOR EACH ROW
BEGIN
:new.flag :=
CASE ABS (:new.col1)
+ ABS (:new.col2)
+ ABS (:new.col3)
+ ABS (:new.col4)
+ ABS (:new.col5)
+ ABS (:new.col6)
+ ABS (:new.col7)
+ ABS (:new.col8)
+ ABS (:new.col9)
+ ABS (:new.col10)
WHEN 0
THEN
1
ELSE
0
END;
END;
UPDATE crore_data
SET col1 = col1;
Tags: Database
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Hello everyone,
First of all to introduce myself. My name is Ivan and I recently started to learn the SQL and PL/SQL. Then don't go hard on me. :)
Now let's move on to the problem. What we have here is a table (a large, but we will need only a few fields) with some information about the calls. 'S called it table1. There is also another, absolutely the same structure, which is empty and we must transfer the recordings of the first.
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So far so good. Now we need to insert these call records in the second table. The C1 are easy - a record = one call. But those partial we must combine so that they become a single whole call. This means that we must be one of the first pieces (C21), find if there is a middle part (C22) with the same caller/called numbers and with the difference in 30 minutes time, then additional research if there is an another C22 and so on. And finally, we search for the last part of the call (C23). As part of this research we sum the length of each part, so we can have the duration of the call at the end. Then, we are ready to be inserted into the new table as a single record, just with the new duration.
But here's the problem with my code... The table a LOT of files and this solution, despite the fact that it works (at least in tests I've done so far), it is REALLY slow.
As I said I am new to PL/SQL and I know that this solution is really newbish, but I can't find another way to do this.
So I decided to come here and ask for some advice on how to improve the performance of this.
I think you're getting confused already, so I'll just put some comments in the code.
I know this isn't a procedure as at present, but it will be once I have create better code. I don't think it's important for now.
I'm using version 1.5.5 Developer SQL and Oracle 11 g.DECLARE CURSOR cur_c21 IS select * from table1 where segmentID = 'C21' order by start_date_of_call; // in start_date_of_call is located the beginning of a specific part of the call. It's date format. CURSOR cur_c22 IS select * from table1 where segmentID = 'C22' order by start_date_of_call; CURSOR cur_c22_2 IS select * from table1 where segmentID = 'C22' order by start_date_of_call; cursor cur_c23 is select * from table1 where segmentID = 'C23' order by start_date_of_call; v_temp_rec_c22 cur_c22%ROWTYPE; v_dur table1.duration%TYPE; // using this for storage of the duration of the call. It's number. BEGIN insert into table2 select * from table1 where segmentID = 'C1'; // inserting the calls which are less than 30 minutes long -- and here starts the mess FOR rec_c21 IN cur_c21 LOOP // taking the first part of the call v_dur := rec_c21.duration; // recording it's duration FOR rec_c22 IN cur_c22 LOOP // starting to check if there is a middle part for the call IF rec_c22.callingnumber = rec_c21.callingnumber AND rec_c22.callednumber = rec_c21.callednumber AND (rec_c22.start_date_of_call - rec_c21.start_date_of_call) = (1/48) /* if the numbers are the same and the date difference is 30 minutes then we have a middle part and we start searching for the next middle. */ THEN v_dur := v_dur + rec_c22.duration; // updating the new duration v_temp_rec_c22:=rec_c22; // recording the current record in another variable because I use it for the next check FOR rec_c22_2 in cur_c22_2 LOOP IF rec_c22_2.callingnumber = v_temp_rec_c22.callingnumber AND rec_c22_2.callednumber = v_temp_rec_c22.callednumber AND (rec_c22_2.start_date_of_call - v_temp_rec_c22.start_date_of_call) = (1/48) /* logic is the same as before but comparing with the last value in v_temp... And because the data in the cursors is ordered by date in ascending order it's easy to search for another middle parts. */ THEN v_dur:=v_dur + rec_c22_2.duration; v_temp_rec_c22:=rec_c22_2; END IF; END LOOP; END IF; EXIT WHEN rec_c22.callingnumber = rec_c21.callingnumber AND rec_c22.callednumber = rec_c21.callednumber AND (rec_c22.start_date_of_call - rec_c21.start_date_of_call) = (1/48); /* exiting the loop if we have at least one middle part. (I couldn't find if there is a way to write this more clean, like exit when (the above if is true) */ END LOOP; FOR rec_c23 IN cur_c23 LOOP IF (rec_c23.callingnumber = rec_c21.callingnumber AND rec_c23.callednumber = rec_c21.callednumber AND (rec_c23.start_date_of_call - rec_c21.start_date_of_call) = (1/48)) OR v_dur != rec_c21.duration /* we should always have one last part, so we need this check. If we don't have the "v_dur != rec_c21.duration" part it will execute the code inside only if we don't have middle parts (yes we can have these situations in calls longer than 30 and less than 60 minutes). */ THEN v_dur:=v_dur + rec_c23.duration; rec_c21.duration:=v_dur; // updating the duration rec_c21.segmentID :='C1'; INSERT INTO table2 VALUES rec_c21; // inserting the whole call in table2 END IF; EXIT WHEN (rec_c23.callingnumber = rec_c21.callingnumber AND rec_c23.callednumber = rec_c21.callednumber AND (rec_c23.start_date_of_call - rec_c21.start_date_of_call) = (1/48)) OR v_dur != rec_c21.duration; // exit the loop when the last part has been found. END LOOP; END LOOP; END;
This is my first post here so I hope it's the right subforum.
I tried to explain it as deep as possible (sorry if it's too long) and I kinda think that code got a bit hard to read with all these comments. If you want I can delete them.
I know that I'm missing a lot of knowledge for all the help is really appreciated.
I thank very you much in advance!Hi and welcome to the forums.
Thanks for posting your code (and using code tags... it's a miracle of a novice!).
What would be nice would be if you could provide some example data and expected results; as described in the FAQ: {message identifier: = 9360002}
Your code is very likely to be slow because of the number of nested loops cursor that you use. Which is known in the trade as treatment of rank by rank (more affectionately known as slow-by-slow transformation, as he was known to be slow). It is slow because the PL engine must keep going back and forth between himself and the SQL engine and the INSERT you in a loop called SQL much time to insert data.
Usually this kind of thing can be achieved by using something like a single INSERT... ... SELECT statement where the SELECT all the treatment that you put in the language PL, or sometimes a SQL MERGE statement if a conditional is sort of insert/update.
If you post your data so people can get an idea of what is the logic (and have something to test with and know what results should be) then we can help.
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fast object chec 467 0 20 43 0.0 .2 direct path write 1,890 0 19 10 0.0 .2 Background Wait Events Avg %Time Total Wait wait Waits % bg Event Waits -outs Time (s) (ms) /txn time -------------------------- ------------ ----- ---------- ------- -------- ------ log file parallel write 71,426 0 393 5 0.6 10.3 db file parallel write 31,764 0 223 7 0.3 5.8 Backup: MML create a backu 4 0 163 40660 0.0 4.3 Backup: MML write backup p 14,976 0 153 10 0.1 4.0 control file parallel writ 5,276 0 81 15 0.0 2.1 Backup: MML commit backup 4 0 50 12598 0.0 1.3 log file sequential read 530 0 21 39 0.0 .5 db file async I/O submit 10,968 0 17 2 0.1 .5 db file sequential read 4,562 0 17 4 0.0 .4
If you actually 160 hearts, most of the drivers is inactive (so it's not one of the dozens of databases on the same server, all the competitor for the same 160 cores), you have the Enterprise edition (which I believe is required for a parallel query, but it is also a sine qua non for the Performance and Tuning Pack (, which would be necessary for the AWR report you posted) and batch processing are parallelizable, Yes, that would certainly improve the performance of the batch. If batches are parallelizazble will depend on how they are built. If they do operations based on a game, for example, Oracle can often use a parallel query to significantly improve performance. If you have a lot of line of PL/SQL, it'll take more work to run in parallel.
Justin
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Because of re-initializing DB helps improve performance
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The re-initialization DB helps improve the performance of the DS. We can do this once a year as a preventive measure?
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PauljTry this
Or
Note the / > at the end of the img tag. And with the alt attribute is a good habit.
You do not put the wwv_flow_file_mgr.get_file? p_security_group_id = 100000 & p_fname = on CBC
Kind regards
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Can someone answer me these questions or to provide me with the resource (s) where I can find this information myself.
+ As you indicate, hard numbers comparisons are the kind of the gold standard that we are looking for pipes for +.
I would be particularly interested in making a comparison, something like this:A. system - VM system with two virtual machines, each running a server is under load
B. system B-only one BONE, just above the metal, with these same two servers running on this subject under the same load nakedtake this base A against B test and compare along a bunch of parameters:
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3 CPU intensive care
4. some combinations
5. what he looked like in the 'start-up' compared to the stationary State
6. What are the boundary conditions; scenarios in each of A and B, where you can cause particularly bad claim, etc..
7. etc. Something like that seems to me that it would be particularly useful, because it would really help characterize the kind of servers that can be inserted on VM without worry. And he would bring clarity to the kind of performance degradation (or a user effect) you should expect in various scenarios. Armed with such data, it would be much easier to say "X process can be had VM without a second thought, while process there should only be VM had in these conditions... and Z process will benefit actually put itself on its own virtual machine... », etc.
Thank you
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To be honest, as this depends on many variables, but take a look at http://www.vmware.com/resources/techresources/cat/91, 96 for some docs or just google vmware performance, Dell, HP and other manufacturers/vendors have stats
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I have a similar setup (converted from the X220T) and use Evernote and Onenote on TPT2 without problems. I was concerned about the drop in performance. I think that Windows 8 in combination with the new Atom Processor improves the combination. I also had a Nokia mobile with an old Atom and Win7 - what a difference now. No problem with MS Powwerpoint or word. AVG works well and does not affect the speed. Surface Pro would have been my choice, but the battery life is not acceptable.
Good luck.
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Although there are all kinds of figures and data for the specifications of all the double channel LinkSys USB adapters that I see nothing that tells me if a newer version as the USBN900 would offer any help to the performance in the WUSBN600. I use the docking option to increase the height of the adapter, because it significantly improves the signal strength on being connected directly to a USB port on the PC. I know also that connect something on my PC that comes out that far forward or backward thereafter will take an accidental bump probably break and possibly damage the CROWD... At least in the cramped neighborhoods I'm currently in.
So, how can I determine if the adapter newest WiFi can offer so probably best speed performance?
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That's the question I need an answer to. Unfortunately the account is in the name of my father and for the moment I have no way to access this information. I'll have to ask him to find a billing statement to know that we have the package.I am very aware that my performance is limited to "the weaker or slower the link in the chain.
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my windows vista is not closed.
my windows vista is not closed. It goes through all the motions & then the screen turns black, stay that way for a long time & then starts by itself. a window of dialogue sometimes said that just recovered windows suddenly stopped and that sometimes
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Unable to start - blocked Windows updates to install updates
original title: I can not connect after restarting my computer during updates. Help, please I have a Sony Vaio laptop running windows Vista (2008). It came pre loaded so I don't have an installation disc. I was in the middle of a huge update (windows