Better sql query.

hello all,
i am using 11g db, and have written a query which joins 4-5 tables and fetches data .these are big tables and query takes some time.
suppoes the tables are tab1 to tab5.
now i want to add another condition using tab6, which has2.5 milion records.
i have to see that the data fetched from the query does not have a matching record in tab6
eg:
filter condition is
and (tab3.col1,tab3.col2) not in (select tab6.col1, tab6.col2 from tab6)
i assume that this will iterate 2.5 million times for every row fetched from the main query .
is there a better way?
thanks

The Oracle optimiser is smart and has many ways of doing things. The query might iterate over the first set and look up an index on tab6 (col1, col2) but I think it is more likely to do another type of anti-join (hash or merge) because row by row lookups end up doing so much I/O. It will do its best to avoid scanning tab6 multiple times. With millions of rows, single full table scans are good. If your original query is estimated to only get a few thousand rows, and there is no index, I'd expect to see a hash anti-join with the database working out the original result set then using the hash anti-join to remove the rows that have a match.
You can get some idea by doing an explain plan on the proposed query, although the most accurate results come from running the query then using DBMS_XPLAN.DISPLAY_CURSOR to view the actual plan. In SQLPlus, set serverout off; alter session set statistics_level=ALL; run your query then select * from table(dbms_xplan.display_cursor(null, null, 'IOSTATS LAST'))
Another way of describing the query is
select ... from (current query) q
left outer join tab6 on tab6.col1 = tab3.col1 and tab6.col2 = tab3.col2
where tab6.col1 is null
That uses an outer join to find the cases where the row exists and then the where clause excludes those, keeping only the rows where there was no match. This sometimes gives a different plan.
Tell us your Oracle version, (to 4 places e.g. 11.2.0.3) at least, and try each query to see what it does.
regards,
David

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Select d.stock,i.description,c.categoryname,
Round(IsNull(Sum(d.qty),0),2) AS qty,
From mytab1 d,mytab2 s,invent i,mytab3 c
Where
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And i.code = c.code   --code:univarchar(2)
And d.stock = i.stock --stock: univarchar(12)
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Group By c.categoryname,d.stock,i.description
Order By d.stock
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The command completed with no results returned
QUERY PLAN FOR STATEMENT 1 (at line 1).
Executed in parallel by coordinating process and 4 worker processes.
    STEP 1
        The type of query is SELECT (into Worktable1).
        GROUP BY
        Evaluate Grouped SUM OR AVERAGE AGGREGATE.
        Evaluate Grouped SUM OR AVERAGE AGGREGATE.
        Evaluate Grouped SUM OR AVERAGE AGGREGATE.
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        Using I/O Size 16 Kbytes for data pages.
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        Using I/O Size 16 Kbytes for data pages.
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        With LRU Buffer Replacement Strategy for data pages.
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SQL query execution Issue

Hi,
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Effected SQL List:
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INNER_PK_TECH_KEY, TRANS_INNERS, TRANS_EACHES, TRANS_UOM, TRANS_WEIGHT,
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VALUES
(:B22 , :B1 , :B2 , :B3 , :B4 , :B5 , :B21 , :B6 , :B7 , :B8 , :B20 , :B19 ,
NULL, :B9 , :B10 , :B11 , 0.0, :B12 , :B13 , :B14 , :B15 , :B16 , :B17 ,
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call count cpu elapsed disk query current rows
Parse 722 0.09 0.04 0 0 0 0
Execute 1060 7.96 83.01 11442 21598 88401 149973
Fetch 0 0.00 0.00 0 0 0 0
total 1782 8.05 83.06 11442 21598 88401 149973
Misses in library cache during parse: 1
Optimizer goal: CHOOSE
UPDATE /*+ ROWID(TRFDTLEE) */TRFDTLEE SET TRF_STATUS = :B2
WHERE
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call count cpu elapsed disk query current rows
Parse 635 0.03 0.01 0 0 0 0
Execute 49902 14.48 271.25 41803 80704 355837 49902
Fetch 0 0.00 0.00 0 0 0 0
total 50537 14.51 271.27 41803 80704 355837 49902
Misses in library cache during parse: 1
Optimizer goal: CHOOSE
DECLARE
var_trans_session     invtrnee.trans_session%TYPE;
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-- ADDED BY SHANKAR ON 08/29/97
-- GET THE NEXT AVAILABLE TRANS_SESSION
bastkey('trans_session',0,var_trans_session,'T');
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call count cpu elapsed disk query current rows
Parse 0 0.00 0.00 0 0 0 0
Execute 1 24191.23 24028.57 8172196 10533885 187888 1
Fetch 0 0.00 0.00 0 0 0 0
total 1 24191.23 24028.57 8172196 10533885 187888 1
Misses in library cache during parse: 0
Misses in library cache during execute: 1
Optimizer goal: CHOOSE
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Parse 1 0.01 0.00 0 0 0 0
Execute 56081 1.90 2.03 0 0 0 0
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total 112163 12.98 460.61 53792 246017 0 56081
Misses in library cache during parse: 1
Optimizer goal: CHOOSE
******************

First off, be aware of the assumptions I'm making. The SQL you presented above strongly suggests (to me at least) that you have cursor for loops. If that's the case, you need to review what their purpose is and look to convert them into single statement DML commands. For example if you have something like this
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DECLARE
BEGIN
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                some_other_table b
            WHERE
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    WHEN MATCHED THEN
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    WHEN NOT MATCHED THEN
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HTH
David

What SQL query I need for this?

I need to execute a SQL query but I don't know how.
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    1         2005-04-31
    1         2005-03-31
    1         2005-02-31
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Two requirements for the query:
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The result in my example should look like this:
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    1         2005-11-31
    1         2005-10-31
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    1         2005-06-31
    1         2005-05-31
    1         2005-04-31
    1         2005-03-31
    1         2005-02-31
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To get all the information from the last 12 months
you will have to use date manipulation.
SELECT add_months(sysdate, -12) from
dual;This gives you the date 12 months ago.
So you will have to select your date between then and
the current date.If I do this I will get this data:
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    1         2005-12-31
    1         2005-11-31
    1         2005-10-31
    1         2005-09-31
    1         2005-08-31
    1         2005-07-31
    1         2005-06-31
    1         2005-05-31
    1         2005-04-31
    1         2005-03-31
    1         2005-02-31
    1         2005-01-31
    2         2005-12-31
    2         2005-11-31
    2         2005-10-31
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    1         2005-12-31
    1         2005-11-31
    1         2005-10-31
    1         2005-09-31
    1         2005-08-31
    1         2005-07-31
    1         2005-06-31
    1         2005-05-31
    1         2005-04-31
    1         2005-03-31
    1         2005-02-31
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Here are my two requirements for the query:
1. Get the sales data for the last 12 months.
2. But get ONLY the sales data for articles where there is sales data since AT LEAST 6 months.
The result can contain as many IDs as you want if the two requirements are met. Its not a trivial SQL statement for me. Please remember that the above data are only for illustration. They are just an example.
There should be a SQL statement for this.
Please tell me if you don't understand my problem. I will try to explain it in a better way if I can.

SQL Query in Prompt

Hi,
in "Show" section of my prompt i've following SQL Query:
select Country."Company Description" from Prototype where Country."Country Code Company GOAL Code" IN
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(Select Entity_Relationship.Company from Prototype where Entity_Relationship.Child
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Hi,
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Sql query to seperate character and number data in a column

Hi,
We have a test table on 10.2.0.4 db as below;
10:44:34 TEST:WAULT > desc t;
Name Null? Type
EMP VARCHAR2(10)
10:43:18 TEST:WAULT > select * from t;
EMP
JOHN
7281
TOM
7852145
BNPPARIBAS
9862354
Mindcraft
875
INFINITY
78998775
01234
EMP
0
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SCOTT
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Thanks,
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>
Hi,
EMP
JOHN
7281
TOM
7852145
The question is; we need to segregate the character data and numerical data in the EMP field, using sql query.
Plz suggest as to how we can achieve this.Check out the CAST function
http://download.oracle.com/docs/cd/B12037_01/server.101/b10759/functions015.htm
However, I would have to ask why on earth you're doing this - it would, IMHO, be
much better to redesign your app. It looks like you have an EAV problem
(AKA MUCK or OTLT) Google Joe Celko and these terms.
Paul...
Rahul

Oracle Sql Query issue Running on Different DB Version

Hello All,
I have come into situation where we are pruning sql queries on different DB version of Oracle and have performance issue. Let me tell you in brief and i really appreciate for your prompt response as its very imperative stuff.
I have a query which is running on a DB of version 7.3.4 and it takes around 30 mins where as the same query when run on 8i it takes 15sec., its a huge difference. I have run the statistics to analyze on 7.3 and its comparatively very high. Question here is, the sql query trys to select data from same schema table and 2 tables from another DB using DB link and 2 other tables from another DB using DB link.So,how can we optimize this stuff and achieve this run as same time as 8i DB in 7.3. Hope i am clear about my question, Eagerly waiting for your replies.
Thanks in Advance.
Message was edited by:
Ram8

Difficult to be sure without any more detailed information, but I suspect that O7 is in effect copying the remote tables to local temp space, then joining; 8i is factoring out a better query to send to the remote DBs, which does as much work as possible on the remote DB before shipping remaining rows back to local.
You should be able to use EXPLAIN PLAN to identify what SQL is being shipped to the remote DB, If you can't (and it's been quite a while since I tried DB links or O7) then get the remote DBs to yourself, and set SQL_TRACE on for the remote instances. Execute the query and then examine the remote trace files, And don't forget to turn off the tracing when you're done.
Of course it could just be that the CBO got better,,,
HTH - if not, post your query and plans for the local db, and the remote queries.
Regards Nigel

Question about using objects in SQL query.

I had posted this question in the SQL/PLSQL forum but I guess nobody took the time to understand exactly what I am asking so I decided to try here hoping to get the answer. So here is the thing:
I have created generic object type "tree" - the constructor takes as a parameter sql query which returns "node_id" and "parent_node_id" - this is all we need to have a tree. The object has all related to a tree structure member functions and one of them is "oldest_relative" (the tree may not be fully connected - it may be more like a set of many trees, so it's not necessary all nodes to have the same root).
I also have departments table with the following fields: department_id, parent_department_id, department_name,...
all records in the table w/out parent_departments (parent_department_id is null) are considered divisions.
Now if I run the following query:
SELECT "DEPARTMENT_ID", "PARENT_DEPARTMENT_ID", "DEPARTMENT_NAME", tree('select department_id "node_id", parent_department_id "parent_node_id" from departments').oldest_relative("DEPARTMENT_ID") "DIVISION_ID" FROM departments
my question is: Is the tree object created for every row or does Oracle somehow caches the object since the object itself is not changing but only the parameter for the oldest_relative member function.
The table only has a few hunderd records and I can't see much of a difference in the execution time btw the query above and query like this:
SELECT "DEPARTMENT_ID", "PARENT_DEPARTMENT_ID", "DEPARTMENT_NAME", b.t.oldest_relative("DEPARTMENT_ID") "DIVISION_ID"
FROM departments left join (select tree('select department_id "node_id", parent_department_id "parent_node_id" from departments') t from dual) b on 1 = 1
where the object is clearly created just ones. (there is probably a better way to do it instead of this join)
Pls elaborate
George

Not exactly sure what the question is...
As I understand, you are comparing the following two constructor calls:
+select.. tree('select department_id "node_id", parent_department_id "parent_node_id" from departments').oldest_relative("DEPARTMENT_ID") ... FROM ...+
+select tree('select department_id "node_id", parent_department_id "parent_node_id" from departments') ... FROM dual+
These calls are the same (besides the 1st one doing an immediate implicit call to a method of the object being constructed). The number of times these are being called depends on the number of times this SQL projection is applied - and that is determined by the number of rows being projected by the SELECT.
The latter one is against DUAL which only has a single row. So that constructor is only called once. The former can be against multiple rows. Obviously a single pass through a data set is desirable - which means that the sub-select (use by the constructor) should ideally only be executed once and makes the 2nd method more desirable.
However, I'm having a hard time understanding why the class and constructor are at all needed. Why pull data from a SQL table into PL memory? As that is where the class will need to cache and store the results of that construction parameter SQL SELECT. And once in PL memory, how does the object effectively access, search and use this cached data?
PL memory is expensive. It is not sharable.
PL data structures are primitive - these cannot be compared to SQL structures in the form of tables and columns that can be stored in a number of physical ways (index tables, hash tables, partitioned tables, clustered tables, etc). Cannot be indexed like SQL structures using B+tree, bitmap, function and other indexing methods. Cannot be sorted, grouped, analysed, filtered, etc like SQL structured data.
It makes very little sense to read SQL data into a class and then deal with that data, cached in expensive PL memory, using primitive PL structures.
And the same would be true if Java or C# was used. The best place for data is inside the SQL engine. That is the most superior environment for data. It can processes more data, scale better, perform better and offer more flexibility, than pulling data from it and then crunch that data using PL or Java or C#.

Parse User Pasted Text and use in SQL query

I am trying to take some user pasted text (typically would come from Excel) and parse those values and put into a query.
text area:
":P11_text"
query:
"select *
from table
where column in :P11_text;"
I have tried some variations of replace and translate in order to parse that list of values...something like: translate(:P11_text, chr(10)||chr(13), ',' ).....and many variations of this.
I have been able to replace the end of lines with the commas, but it appears that I am not getting my single quotes captured, even when trying to force them in. The best attempt returned single quotes and commas in between values but not at the beginning and end of the list of values.
I would bet that there is an easy way to accomplish this or an easy way to accomplish the requirement in a different way altogether.
Please point me in the right direction.

I finally got this one figured out!
create or replace type myTableType as table
of varchar2(4000)
create or replace
function in_list( p_string in varchar2 ) return myTableType
as
l_string long default p_string || ',';
l_data myTableType := myTableType();
n number;
begin
loop
exit when l_string is null;
n := instr( l_string, ',' );
l_data.extend;
l_data(l_data.count) :=
ltrim( rtrim( substr( l_string, 1, n-1 ) ) );
l_string := substr( l_string, n+1 );
end loop;
return l_data;
end;
--The SQL Query is:
select *
from t wher c in (select *
from THE
( select cast( in_list(translate(:p10_prolist,chr(10)||chr(13),',')) as
mytableType ) from dual ) a);
--Working like a champion!!!

Better sql query.

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