Better way of populating Z-Table....

Hi
I am loading delta from Customer data file to BI DSO & also populating this delta records to some Z-Table (say: Shadow Table) like follows:
1st way)
Loopu2026
u2026..
u2026u2026
MODIFY ZMD_MANUFACTURER FROM WA_SHADOW.
Endloop.
2ND Way) We can also follow this method instead of following above mentioned 1st way as:
Loopu2026u2026
     u2026u2026u2026u2026.
     u2026u2026u2026u2026u2026
     APPEND WA_SHADOW TO ITAB_SHADOW.
ENDLOOP.
MODIFY ZMD_MANUFACTURER FROM TABLE ITAB_SHADOW.
Which is better way in terms of Performance?
Thanks...

Hi Harpal,
The 2nd way should be good in terms of performs and the simple reason behind that is, in first approach everytime you want to update record it will hit to database but in second approach it will hit database only once.
So 2nd approach would be better from perfromance point of view.
Regards,
Durgesh.

Similar Messages

A better way than a global temp table to reuse a distinct select?

I get the impression from other threads that global temp tables are frowned upon so I'm wondering if there is a better way to simplify what I need to do. I have some values scattered about a table with a relatively large number of records. I need to distinct them out and delete from 21 other tables where those values also occur. The values have a really low cardinality to the number of rows. Out of 500K+ rows there might be a dozen distinct values.
I thought that rather than 21 cases of:
DELETE FROM x1..21 WHERE value IN (SELECT DISTINCT value FROM Y)
It would be better for performance to populate a global temp table with the distinct first:
INSERT INTO gtt SELECT DISTINCT value FROM Y
DELETE FROM x1..21 WHERE value IN (SELECT value FROM GTT)
People asking questions about GTT's seem to get blasted so is this another case where there's a better way to do this? Should I just have the system bite the bullet on the DISTINCT 21 times? The big table truncates and reloads and needs to do so quickly so I was hoping not to have to index it and meddle with disable/rebuild index but if that's better than a temp table, I'll have to make do.
As far as I understand WITH ... USING can't be used to delete from multiple tables or can it?

Almost, but not quite, as efficient as using a temporary table would be to use a PL/SQL collection and FORALL statements and/or referencing the collection in your subsequent statements). Something like
DECLARE
TYPE value_nt IS TABLE OF y.value%type;
l_values value_nt;
BEGIN
SELECT distinct value
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FORALL i IN 1 .. l_values.count
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FORALL i IN 1 .. l_values.count
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END;or
CREATE TYPE value_nt
IS TABLE OF varchar2(100); -- Guessing at the type of y.value
DECLARE
l_values value_nt;
BEGIN
SELECT distinct value
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DELETE FROM x1
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DELETE FROM x2
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END;Justin

Is there any better way for updating table other than this?

Hi all, I need to update a row in the table that require me to search for it first (the table will have more than hundred thousands of row). Now, I am using a LOV that will return the primary key of the row and put that primary key to DEFAULT_WHERE property in the block and execute query command to fetch the row that need updating. This works fine except that it require 2-query-trip per update (the lov and the execute_query). Is there any better way to doing this? This update is the main objective for my application and I need to use the most effective way to do it since we need to update many records per hour.

Thanks Rama, I will try your method. Others, how to query row instead of primary key? I thought that querying primary key is faster due to the index?
BTW, what people do if you need to update a table using Form? I have been using the LOV then execute query since I first developing form. But I am building a bigger database recently that I start worrying about multiple query trip to dbms.
FYI my table will have up to million rows on it. Each row will be very active (updated) within 1-2 weeks after it creation. After that it will exist for records purposes only (select only). The active rows are probably less than 1% of all the rows.

Need help to get alternate or better way to write query

Hi,
I am on Oracle 11.2
DDL and sample data
create table tab1 -- 1 millions rows at any given time
id       number       not null,
ref_cd   varchar2(64) not null,
key      varchar2(44) not null,
ctrl_flg varchar2(1),
ins_date date
create table tab2 -- close to 100 million rows
id       number       not null,
ref_cd   varchar2(64) not null,
key      varchar2(44) not null,
ctrl_flg varchar2(1),
ins_date date,
upd_date date
insert into tab1 values (1,'ABCDEFG', 'XYZ','Y',sysdate);
insert into tab1 values (2,'XYZABC', 'DEF','Y',sysdate);
insert into tab1 values (3,'PORSTUVW', 'ABC','Y',sysdate);
insert into tab2 values (1,'ABCDEFG', 'WYZ','Y',sysdate);
insert into tab2 values (2,'tbVCCmphEbOEUWbxRKczvsgmzjhROXOwNkkdxWiPqDgPXtJhVl', 'ABLIOWNdj','Y',sysdate);
insert into tab2 values (3,'tbBCFkphEbOEUWbxATczvsgmzjhRQWOwNkkdxWiPqDgPXtJhVl', 'MQLIOWNdj','Y',sysdate);I need to get all rows from tab1 that does not match tab2 and any row from tab1 that matches ref_cd in tab2 but key is different.
Expected Query output
'ABCDEFG', 'WYZ'
'XYZABC',   'DEF'
'PORSTUVW', 'ABC'Existing Query
select
   ref_cd,
   key
from
    select
        ref_cd,
        key
    from
        tab1, tab2
    where
        tab1.ref_cd = tab2.ref_cd and
        tab1.key    <> tab2.key
    union
    select
        ref_cd,
        key
    from
        tab1
    where
        not exists
           select 1
           from
               tab2
           where
               tab2.ref_cd = tab1.ref_cd
    );I am sure there will be an alternate way to write this query in better way. Appreciate if any of you gurus suggest alternative solution.
Thanks in advance.

Hi,
user572194 wrote:
... DDL and sample data ...
create table tab2 -- close to 100 million rows
id       number       not null,
ref_cd   varchar2(64) not null,
key      varchar2(44) not null,
ctrl_flg varchar2(1),
ins_date date,
upd_date date
insert into tab2 values (1,'ABCDEFG', 'WYZ','Y',sysdate);
insert into tab2 values (2,'tbVCCmphEbOEUWbxRKczvsgmzjhROXOwNkkdxWiPqDgPXtJhVl', 'ABLIOWNdj','Y',sysdate);
insert into tab2 values (3,'tbBCFkphEbOEUWbxATczvsgmzjhRQWOwNkkdxWiPqDgPXtJhVl', 'MQLIOWNdj','Y',sysdate);
Thanks for posting the CREATE TABLE and INSERT statments. Remember why you go to all that trouble: so the people whop want to help you can re-create the problem and test their ideas. When you post statemets that don't work, it's just a waste of time.
None of the INSERT statements for tab2 work. Tab2 has 6 columns, but the INSERT statements only have 5 values.
Please test your code before you post it.
I need to get all rows from tab1 that does not match tab2 WHat does "match" mean in this case? Does it mean that tab1.ref_cd = tab2.ref_cd?
and any row from tab1 that matches ref_cd in tab2 but key is different.
Existing Query
select
ref_cd,
key
from
select
ref_cd,
key
from
tab1, tab2
where
tab1.ref_cd = tab2.ref_cd and
tab1.key    <> tab2.key
union
select
ref_cd,
key
from
tab1
where
not exists
select 1
from
tab2
where
tab2.ref_cd = tab1.ref_cd
Does that really work? In the first branch of the UNION, you're referencing a column called key, but both tables involved have columns called key. I would expect that to cause an error.
Please test your code before you post it.
Right before UNION, did you mean
tab1.key    != tab2.key? As you may have noticed, this site doesn't like to display the <> inequality operator. Always use the other (equivalent) inequality operator, !=, when posting here.
I am sure there will be an alternate way to write this query in better way. Appreciate if any of you gurus suggest alternative solution.Avoid UNION; it can be very inefficient.
Maybe you want something like this:
SELECT       tab1.ref_cd
,       tab1.key
FROM           tab1
LEFT OUTER JOIN tab2 ON tab2.ref_cd     = tab1.ref_cd
WHERE       tab2.ref_cd IS NULL
OR       tab2.key     != tab1.key
;

Can some one tell me a better way...

Hi All..
I work on a web application. I create user ids for people logging into my application. here I have a small problem.. This is what I am currently doing...
When I create a new user, I assign a new user id to the user and store all hi info.
All our user ids are stored in User_ID table and user info in User_Info table.
First I get the max user id from the User_Id table.
int iuserid = select max(User_ID) from User_ID;
Then I add ' 1 ' to this and assign it to new user.
iuserid = iuserid+1;
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Then I store all user info in User_info table..
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Both these SQLs are executed as a transaction.
The problem that I have...
It works fine in a normal environment and in my testing.
But when the load inceases, before I insert into the User_info, another user tries to get the max User_id from User_ID table, then it conflicts..
I have seen occurences of User_Info storing the info of a different user against the User_id when many people are accessing the app at the same time.
Can some one tell me a better way to handle this scenario..
Appreciate all you help..
TIA..
CK

Hi,
assuming that the requirement for user_id is only for uniqueness (primary key requirement) not continuosly.
perhaps can try this,
1) create a table to keep the max id for each table's key.
e.g.
create table key_id_lookup
key_name char(n),
current_value number(m)
where n & m is the size of the field
2) for each creation of entry in the user_id table, lookup the value in the key_id_table and increment it after retrieval.
e.g. current_id = select current_value from key_id_lookup where key_name = 'user_id_key';
current_id+=1;
update key_id_lookup set current_value = current_id where key_name = 'user_id_key';
something similar to use of sequence if your database support it.
3) continue with the creation of record in other tables. now obtain the time stamp of creation and append with the current_id obtained. e.g. timestamp = 132456872; size of m is 5, user_id = 132456872 x 100000 + current_id;
this should give you a unique key at creation time.
There should be other better ways of resolving this(like locking the table for the update operation but affect performance, etc), depending on the feature supported by the database in use.
Hope this can help as last resort if other options not available.

A better way to do this ?

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import java.sql.SQLException;
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OracleDriver oracle = new OracleDriver();
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import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
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PLSQL does not go through Java to access the database. The actual access to the database is via the same mechanism for both, so in some sense, both perform about the same. However, PLSQL datatypes have the same representation as database datatypes so there is no conversion. Java datatypes have different representations than database datatypes so there is a conversion cost associated with moving data between Java and the database.
If your processing is simple and you are moving a lot of data, PLSQL is likely the better choice. If your processing is more complex and you are moving less data, Java is likely the better choice. There are other things such as portability you should consider, but the amount of data and complexity of the code are the first considerations.
Douglas

A better way to generate the needed XML?

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Hello,
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Thanks- Neally

As far as the Presentation Layer is concernd (i.e., in Answers) your way is the best I can think of. The only way you can sort a list of values apart from a way the system could automatically determine (e.g., alphabetically, chronologically, numerically, etc.) is to create your own definition. Without human intervention or customized rules, there is no way any system would know that "C" should come before "S" (as in "Assigned" and "Accepted", or that "O" should come before "L" as in "Completed" and "Closed").
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Looking for a better way to utilize streams to track deletes in the db.

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THANK YOU!!
I used this format before actually for an exam in an online training program, and I don't know why I didn't make the connection.
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L

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Hi !
For check if the same display name and type already exists in table i would use Unique Key , but then again instead of if statement you should code some exception handlers. ... Hm .. Unque key is by may opinion better solution as
codeing checks .
For faster inserts that is , smaller code .. if there is no rules for values and the values are fixed , in any case you have to do this 100 inserts. If you can "calculate" values then maybe you can figure out some code .. but effect will be the same as hundred insert stetements one after another .. Procedure with this 100 inserts is not so bad solution.
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T
Edited by: ttt on 10.3.2010 13:01

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Thanks.
Program asks for data on two species and has to respond by telling how many years it will
take for the species with lower
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private String name2;
private int population1;
private int population2;
private double growthRate1;
private double growthRate2;
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if ((population2>population1) &(growthRate2<growthRate1))
max=population2;
maxName=name2;
maxGrowthRate=growthRate1;
min=population1;
minName=name1;
minGrowthRate=growthRate2;
while ( (min <=max) & (years > 0) )
min= (min +((minGrowthRate/100) * min));
max=(max + ((maxGrowthRate/100) * max));
years ++;
System.out.println("The species " + minName + " will outnumber the species " + maxName +
" in " + (years+1) + " years");
public class Species
     public static void main(String[] args)
     SpeciesTry s1= new SpeciesTry();
     s1.readInput();
     s1.writeOutput();
     s1.outnumbersPopulation();
}

I'm new to Java and posting. So, here's my program again with outnumberPopulation() method formated. Is there any hope for this program?
class SpeciesTry
private String name1;
private String name2;
private int population1;
private int population2;
private double growthRate1;
private double growthRate2;
public void readInput( )
System.out.println("What is the first species' name?");
name1 = SavitchIn.readLine( );
System.out.println("What is the population of the species?");
population1 = SavitchIn.readLineInt( );
while (population1 < 0)
System.out.println("Population cannot be negative.");
System.out.println("Reenter population:");
population1 = SavitchIn.readLineInt( );
System.out.println("Enter growth rate (percent increase per year):");
growthRate1 = SavitchIn.readLineDouble( );
System.out.println("What is the second species' name?");
     name2 = SavitchIn.readLine( );
     System.out.println("What is the population of the species?");
     population2 = SavitchIn.readLineInt( );
     while (population2 < 0)
     System.out.println("Population cannot be negative.");
     System.out.println("Reenter population:");
     population2 = SavitchIn.readLineInt( );
     System.out.println("Enter growth rate (percent increase per year):");
growthRate2 = SavitchIn.readLineDouble( );
public void writeOutput( )
System.out.println("Name of the species' = " + name1);
          System.out.println("Population = " + population1);
          System.out.println("Growth rate = " + growthRate1 + "%");
          System.out.println("Name of the species' = " + name2);
          System.out.println("Population = " + population2);
System.out.println("Growth rate = " + growthRate2 + "%");
   public void outnumbersPopulation()
        double max=0; double min=0; double minGrowthRate=0; double maxGrowthRate=0;
        String maxName=null; String minName=null;
                int years=0;
        if( population1>population2)// this is to determine which population is smaller
        {    max=population1;
            maxName=name1;
            maxGrowthRate=growthRate2;
            min=population2;
            minGrowthRate=growthRate1;
            minName=name2;
         else
                max=population2;
                maxName=name2;
                maxGrowthRate=growthRate1;
                min=population1;
                minName=name1;
                minGrowthRate=growthRate2;
       if (minGrowthRate<=maxGrowthRate)
          System.out.println(minName+" will never grow larger than "+maxName);
          return;
         while ( (min <=max) & (years > 0) )
             min= (min +((minGrowthRate/100) * min));
               max=(max + ((maxGrowthRate/100) * max));
                           System.out.println("Check" + max + min);
                           years ++;
        System.out.println("The species " + minName + " will outnumber the species " + maxName +
        " in " + (years+1) + " years");
public class Species
     public static void main(String[] args)
     SpeciesTry s1= new SpeciesTry();
     s1.readInput();
     s1.writeOutput();
     s1.outnumbersPopulation();
}

Populating Fact tables

Hi,
First time working on DW. Have got my staging and Dimension table setups.
About to start working on Fact tables and all examples I see online are using SSIS packages with several lookup tables.
Is there any reason that this cannot be done using Stored procedure or I have to develop SSIS package to populate fact tables.
Thanks,

Hello,
In fact we are using stored procedure for all our manipulations and populating fact table. The fact table is partitioned and works great with no issues.
We are calling the stored procedure and PL/SQL procedure from Informatica. I don't find any issue in processing but I feel difficulty in debugging 5000 lines of code.
If the transformation are simple and it can be handle in stored procedure than you can go for it But SSIS is designed for ETL.
In considering maintenance overhead SSIS gives better control over the data flow because business logic and debugging is much easier than doing the same in stored procedure.
If you've partitions and properly designed data structures definitely you can think of using SP.
-Prashanth

Better way of populating Z-Table....

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