Tuning Select With Nested Table?
Feb 18, 2011
I have created table with nested table:
CODECREATE OR REPLACE TYPE ADDR_T AS OBJECT (
ADDR1 VARCHAR2 (50),
ADDR2 VARCHAR2 (50)
);
CREATE OR REPLACE TYPE t_ADDr AS TABLE OF ADDR_T;
[code]....
I have added some records and created index on ID column. I want to get result of CODEselect id, p.addr1,p.addr2 from nested_table n,table(n.COL1) p where id=1
Explain plan for that is:
CODESELECT STATEMENT ALL_ROWSCost: 8 Bytes: 231 Cardinality: 3
4 HASH JOIN Cost: 8 Bytes: 231 Cardinality: 3
2 TABLE ACCESS BY INDEX ROWID TABLE SYS.NESTED_TABLE Cost: 2 Bytes: 13 Cardinality: 1
1 INDEX RANGE SCAN INDEX SYS.FDSFAS Cost: 1 Cardinality: 1
3 TABLE ACCESS FULL TABLE (NESTED) SYS.COL1_TAB Cost: 5 Bytes: 163,840 Cardinality: 2,560
How to avoid full table scan on nested table? Cardinality is sum of all records in nested column in all rows in main table, why?
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Sep 8, 2009
SQL> select * from v$version;
BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Release 10.2.0.4.0 - Production
CORE 10.2.0.4.0 Production
TNS for Solaris: Version 10.2.0.4.0 - Production
NLSRTL Version 10.2.0.4.0 - Production
5 rows selected.
I have a problem with views and nested selects which I cannot explain. Here is a trimed down version of the research I have done. notice the following:
1) all code is executed from the same user CDRNORMALCODE. this user has all views and procedural code
2) all data is owned by a different user CDRDATA. This user has no views and no code.
My problem is this:
If I reference the table directly with a delete statement that uses a nested select (i.e. IN clause with select), the index I expect and want is used.But if I execute the same delete but reference even the most simple of views (select * from <table>) instead of the table itself, then a full table scan is done of the table.
Here is an execute against the table directly (owned by cdrdata). Notice the reference to the table in the table schema on line 3. Also please notice INDEX RANGE SCAN BSNSS_CLSS_CASE_RULE_FK1 at the bottom of the plan.
SQL> show user
USER is "CDRNORMALCODE"
SQL>
SQL> explain plan for
2 delete
[code]...
OK, here is an update. The views I am useing normally have instead of triggers on them. If I remove the instead of trigger the problem looks like it goes away, when I put the trigger back the problem comes back.But why would an instead-of-trigger change the query plan for a view?
SQL> DELETE FROM PLAN_TABLE;
5 rows deleted.
SQL> explain plan for
2 delete
3 from BSNSS_CLSS_MNR_CASE_RULE_SV
[code]...
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Jul 24, 2007
I have here my SQL
-> INSERT into myTable (col1, col2, col3) values(SELECT table_seq.nextval from dual, 'value2', 'value3');
That's not working...
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Sep 14, 2010
10.2.0.1
I am trying to understand the concept of nested loops.
--------
| 0 | SELECT STATEMENT | | 14 | 364 | 4 (0)| 00
:00:01 |
| 1 | NESTED LOOPS | | 14 | 364 | 4 (0)| 00
:00:01 |
[Code]....
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("A"."DEPTNO"="B"."DEPTNO")
Nested loop by defintion means,for every row returned by the outer query,the inner query is executed that many times.
In the above example,oracle does a full table scan and returned 14 rows.Now for dept table,it does a index unique scan and applies the predicate a.deptno=b.deptno and returns 1 row.
My question is why it is returning only 1 row? That measn for every 14 rows,this one row is fetched 14 times.
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Aug 19, 2010
I've create two types:
create or replace type VAL_REC as object
(WAARDE number(20,5) ) ;
create or replace type VAL_TAB is VARRAY(200) of VALREC ;
create or replace type WSN_REC as object
( START_DATE date
, END_DATE date
, DATA VAL_TAB) ;
create or replace type WSN_TAB as table of WSN_REC ;
In a PL/SQL table collecton WSN_TAB is filled. Now I want to create a query (ref cursor) that gives the result:
START_DATE END_DATE WAARDE(1) WAARDE(2) WAARDE(3) etc.
2010-08-15 2010-08-16 20 20 40
2010-08-16 2010-08-17 23 45 40
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Mar 22, 2010
Is it possible to pass a nested select statement as a parameter to a procedure? In other words, I am currently successfully doing this:
SELECT BASE_PAY INTO N FROM EMPLOYEES WHERE ID=p_ID;
SetPackageValueProc(PkgID,'YearlyBasePay',N);
And I'd like to do something along the lines of this:
SetPackageValueProc(PkgID,'YearlyBasePay',(SELECT BASE_PAY FROM EMPLOYEES WHERE ID=p_ID));
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Dec 21, 2011
I'm trying to create a sort of nested-query within my select of attributes . i.e.
select A.a,
B.b,
(select count(C.*)
from C
where C. = B.d
group by C.y)
from A a,
B b
where A.d = B.d
and ...
Over-simplifying my query:
select B.desc "Location",
F.desc "Source",
A.amt "Amount",
sum(G.G_CNT) "No. Units",
c.desc "Status"
[code]....
I need to incorporate a count of the number of units from TableG that have a certain status. I tried the following but when I tried to run it, I get an error saying that it's not a Group By expression -the red part is highlighted in TOAD.
select B.desc "Location",
F.desc "Source",
A.amt "Amount",
sum(G.G_CNT) "No. Units",
(select count(*)
from TableG G2
where G2.D_ID = D.ID
and G2.status = 10
group by G2.D_ID)"Count",
c.desc "Status"
[code]....
Any thoughts how I can incorporate a query in my select of attributes?how to Group By something.
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Oct 30, 2012
I want to make sure I am describing correctly what happens in a query where there is distributed database access and it is participating in a NESTED LOOPS JOIN. Below is an example query, the query plan output, and the remote SQL information for such a case. Of particular note are line#4 (NESTED LOOPS) and line#11 (REMOTE TABLE_0002).
What I want to know is more detail on how this NESTED LOOPS JOIN handles the remote operation. For example, for each row that comes out of line#5 and is thus going into the NESTED LOOPS JOIN operation @line#4, does the database jump across the network to do the remote loopkup? Thus if there are 1 million rows, does that mean 1 million network hops? Does batchsize play a role? For example, if the database batches in groups of 100 then does that mean 10 thousand network hops?
I think each row that comes out of line#5 means a network hop to the remote database. But I do not know for a fact.I have done some abbreviating in the plan in an attempt to make it fit on the page (line#7 TA = TABLE ACCESS).
SELECT A.POLICY ,
F.MIN_MEMBER_ID,
MIN(A.EFF_DATE) EFF_DATE,
A.EXP_DATE ,
G.DESCRIPTION PROGRAM_NAME,
[code]...
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Mar 27, 2012
Following is the query on TPC-H schema.
explain plan for select
count(*)
from
orders,
lineitem
where
o_orderkey= l_orderkey.
The trace 10053 (as shown below) for this query shows nested loop join with Lineitem as outer table and Orders as inner table. It is effectively join on composite index (pk_lineitem) of Lineitem and unique index(Pk_orderkey) of Orders table. The cost calculation formula as given in the book as "outer table cost + cardinality of outer table * inner table cost " fails here. I am not able to understand this.
BASE STATISTICAL INFORMATION
***********************
Table Stats::
Table: LINEITEM Alias: LINEITEM
#Rows: 6001215 #Blks: 109048 AvgRowLen: 124.00
Column (#1): L_ORDERKEY(NUMBER)
AvgLen: 6.00 NDV: 1500000 Nulls: 0 Density: 6.6667e-07 Min: 1 Max: 6000000
[code]....
how the cost has been calculated. This does not follow the traditional nested loop cost formula as mentioned in the book.
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Jun 23, 2011
I'm joinging two tables event_types and tmp_acc tables.
event_types contains 2 Billion records
tmp_acc contains 20,000 records.
Resulting rows are about 300,000 records in event_types table end_t and account_obj_id0 are joined indexed
no indexs in tmp_acc.
When I run below query with nexted loop it takes 6 hrs to complete. But when I run with hash join even after 4 days it was still running. what is wrong with hash join here. Why it takes so long. I'm joining only 20000 rows. So I think there should be a way to get result rows quickly.
show parameters hash_area_size
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
hash_area_size integer 2097152
explain plan for
select --+ parallel(e,6)
[code]....
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Oct 18, 2012
I want to know how the Oracle optimizer choose joins and apply them while executing the query. So that I will insure about optimizer join before writing any query.
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Jun 26, 2010
I have a table that partitioned into six partitions. each partitions placed in different table space and every two table space placed it on a different hardisk
when I will do query select with the non-partition keys condition, how the search process ? whether the sequence (scan sequentially from partition 1 to partition 6) or partition in a hardisk is accessed at the same time with other partition in other hardisk. ( in the image, partition 1,4 accessed at the same time with partition 2,5 and 3,6)
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Sep 7, 2012
I have a table that has 2 columns of type nested table. Now in the purge process, when I try to truncate or drop a partition from this table, I get error that I can't do this (because table has nested tables). how I will be able to truncate/drop partition from this table? IF I change column types from nested table to varray type, will it work?
Also, is there any short method of moving existing data from a nested table column to a varray column (having same fields as nested table)?
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Jan 9, 2013
a material related to collections with Examples and also how to declare table type values.
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Aug 29, 2012
Is Oracle will support Multi value storage ? In what way we can use Nested table? In real time application where we can use nested table . What is the usage of nested table in real time application.
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May 17, 2011
what is the advantage of Nested table ?
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Sep 10, 2013
I am studing Multidimensional Nested table and have the below code:
DECLARE TYPE table_type1 IS TABLE OF INTEGER; TYPE table_type2 IS TABLE OF TABLE_TYPE1;
table_tab1 table_type1 := table_type1();
table_tab2 table_type2 := table_type2(table_tab1);
BEGIN FOR i IN 1 .. 2 LOOP table_tab2.extend;
table_tab2(i) := table_type1();
[Code]...
exception when others then dbms_output.put_line(sqlerrm);END; This code is working fine as of now.But,If i comment below code(table_tab2 is also extended latter):
table_tab2.extend;
table_tab2(i) := table_type1();
then it gives me error 'Subscription Beyond count'. I would like to know why i need to extend table_tab2 twice?!
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Jul 11, 2011
I want to truncate table partition but I'm getting error:
CODEORA-02266: unique/primary keys in table referenced by enabled foreign keys
because of table has a nested table. Currently this column is not in use so I could drop it, but I want to avoid it (table is huge). Is there another posibility to do truncate partitions in this table? ALTER TABLE ... SET UNUSED doesn't resolve the problem.
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Dec 2, 2010
I try to do this:
CREATE MATERIALIZED VIEW MV_NESTED_DATA
NOCACHE
LOGGING
NOCOMPRESS
NOPARALLEL
BUILD IMMEDIATE
USING NO INDEX
REFRESH COMPLETE
ON DEMAND
START WITH ROUND(SYSDATE)
NEXT ROUND(SYSDATE) + 1
WITH ROWID
AS
select NESTED_TABLE_FIELD from MY_TABLE@Y_DB_LINK;
where NESTED_TABLE_FIELD is a nested table stored as T_NESTED_TABLE
And I get the error: ORA-12014: table 'T_NESTED_TABLE' does not contain a primary key constraint
Why should it if I try to create a MV with "WITH ROWID" refresh option and not "WITH PRIMARY KEY" one?
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Sep 11, 2012
I'm trying to sort a collection in a nested table in PL/SQL so these value can be used later for a display and for export to Excel. The sort is failing.
-- PLS-00642: local collection not allowed in SQL statements
-- PL/SQl: ORA-00902: invalid datatype
The error message are also noted below in the code on the line that fails.
A quick overview of this code- Using a nested table MyNestedTable the values from several select queries are combined into MyRecordsetZero using CURSOR, and MULTISET UNION. I'm trying to either sort MyRecordsetZero or populate MyRecordsetSorted with the sorted values for futher use.
IMPORTANT: The code is running in an enviroment that does not have permission to create.
Versions:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
PL/SQL Developer: 8.0.0.1480
DECLARE
-- Declare the variable MyTID to be used by select statements and
-- set its data type and max character count
MyTID varchar2(10);
[code]....
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Nov 10, 2011
In test.pks file I declared the following type
TYPE tab_tests is table of NUMBER(15);
In test.pkb, I have the following procedure
PROCEDURE report (
i_cid IN NUMBER
)
IS
test1 tab_tests := tab_tests();
test2 tab_tests;
BEGIN
-- I populate test1 with the data and it works fine. But when I tried to make a sorted nested table with the following command.
I got this error 'ORA-00902: invalid datatype',
a nested table than the following, like a built in Oracle collection method?
execute immediate 'select cast( multiset (select * from table(test1) order by 1) as tab_tests) INTO test2 FROM dual';
END;
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Mar 12, 2012
create type nesttype as table of clob;
create table emp
(empno number,
ename varchar2(1000),
language_known nesttype
)
I want to check whether language is already there in database or not.
i have written the below query
select * from emp where language_known =nesttype('english','hindi');
i am getting the below error
SQL Error: ORA-22901: cannot compare nested table or VARRAY or LOB attributes of an object type
22901. 00000 - "cannot compare nested table or VARRAY or LOB attributes of an object type"
*Cause: Comparison of nested table or VARRAY or LOB attributes of an
object type was attempted in the absence of a MAP or ORDER
method.
*Action: define a MAP or ORDER method for the object type.
How to compare data in nested table
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Mar 4, 2013
need to use Extend() in nested tables in Oracle? What could be the problem if I do not use this method in my code?
I have a nested collection type (TABLE OF VARCHAR2(32)) declared in my package. My stored procedure takes the TABLE type as input and inserts that data into a database table.
I see that my code works fine without using EXTEND method.
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Apr 12, 2010
I am getting compilation error when create nested table type depend on table structure
SQL> CREATE OR REPLACE TYPE typ$nttb$1 IS TABLE OF emp%rowtype
2 ;
3 /
Warning: Type created with compilation errors.
SQL> show error
Errors for TYPE TYP$NTTB$1:
LINE/COL ERROR
-------- -----------------------------------------------------------------
0/0 PL/SQL: Compilation unit analysis terminated
1/29 PLS-00329: schema-level type has illegal reference to SCOTT.EMP
SQL>
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Mar 12, 2012
SCOTT@orcl_11gR2> create or replace type nesttype as table of clob;
2 /
Type created.
SCOTT@orcl_11gR2> create table emp
2 (empnonumber,
3 enamevarchar2(1000),
4 hobbynesttype)
5 nested table hobby store as hobby_nt
6 /
Table created.
SCOTT@orcl_11gR2> insert into emp values
2 (1, 'name1', nesttype ('dancing', 'cricket','listening music','dancing'))
3 /
1 row created.
SCOTT@orcl_11gR2> insert into emp values
2 (2, 'name2', nesttype ('cooking', 'dancing','cooking'))
3 /
1 row created.
I want to update nested table record based on index suppose i want to update 3rd number of hobby for name2 employee
i have written the below query
SCOTT@orcl_11gR2>update Table(select hobby from emp
2 where empno= 2) e
3 set value(e)='new_value' where to_char(value(e)) = (select 4 to_char(tab1_element)
5 from (select rownum rn,
[Code]...
2 rows updated.
but the above query is updating 2 records but my requirement is it should update only third record
How can we update nested table based on index number
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Nov 12, 2011
declare
cursor c is
select employee_id from employees;
type nst_type is table of employees.employee_id%type;
emp nst_type;
begin
open C;
loop
exit when C%notfound;
fetch c bulk collect into emp;
end loop;
close c;
end;
Above is the sample code, and now i want to pass 'emp' as an input parameter to the procedure.
How can I do that, as emp is of nst_type type and I do not know how my procedure will recognize the datatype...
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Jul 22, 2013
I am exploring the differences between OBJECT & RECORD. As i am still in process of learning, I found that both are structures which basically groups elements of different datatypes or columns of different datatypes, one is used in SQL and other is used in PL/SQL. Below i am trying to insert data into an table of type object but i am unsuccessful.
CREATE OR REPLACE type sam as OBJECT
(
v1 NUMBER,
v2 VARCHAR2(20 CHAR)
);
---Nested Table---
create or replace type t_sam as table of sam;
--Inserting data----
insert into table(t_sam) values(sam(10,'Dsouza')); Error Message:
[code]........
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Sep 21, 2011
I have a query which returns a nested table as a result of split function. I used any method to unnest the data. But I couldn't. I try it with this query.Note: To run the following query I attached everything needed.
-- This query gives very strange results.
SELECT *
FROM
(
SELECT
[code]...
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Jul 16, 2011
I have an issue on selecting data from a nested table owned by other user.
I have given select access on stc_irb_usr.stc_loy_settlebillpay_map_main to anthr user adminofs.
But when I try to query, it says insufficient privileges. adminofs is able to select other columns which are not nested.
I have given "grant execute on STC_IRB_USR.STC_BILLPAY_MAP_TAB_TYPE to adminofs;" but it did not
select * from stc_irb_usr.stc_loy_settlebillpay_map_main where rownum<3;
ERROR: OCI-21700: object does not exist or is marked for delete
SQL> desc stc_irb_usr.stc_loy_settlebillpay_map_main
Name Null? Type
----------------------------------------- -------- ----------------------------
BATCH_NUM NOT NULL NUMBER
ACCOUNT_NUM NOT NULL VARCHAR2(40)
PAY_BILL_SEQ_MAP STC_IRB_USR.STC_BILLPAY_MAP_
[Code]....
Name Null? Type
----------------------------------------- -------- ----------------------------
ALLOCATING_CREDIT_SEQ NUMBER
ALLOCATION_ENTITY_SEQ NUMBER
ALLOCATING_CREDIT_DATE DATE
ALLOCATING_CREDIT_TYPE VARCHAR2(20)
ALLOCATION_ENTITY_DATE DATE
[Code]...
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May 15, 2013
Insert values into a table. The table is called PurchaseOrder_objtab. Here is the type for the table:
CREATE TYPE PurchaseOrder_objtyp AUTHID CURRENT_USER AS OBJECT
(
PONo NUMBER,
CUST_ref REF Customer_objtyp,
OrderDate DATE,
ShipDate DATE,
[code]...
The LineItemList_ntab is a nested table.
Here is the create code for LineItemList_ntabtyp:
CREATE TYPE LineItem_objtyp AS OBJECT (
LineItemNo NUMBER,
Stock_ref REF StockItem_objtyp,
Quantity NUMBER,
Discount NUMBER
)
[code]...
In the above code, the LineItemList_ntab is an empty LineItemList_ntabtyp. I am wanting to add values to this nested table rather than it being empty in the INSERT INTO code.
Here is some of the code I have tried to insert values with:
INSERT INTO PurchaseOrder_objtab
SELECT 1008, REF(C),
SYSDATE, '12-MAY-1999',
LineItemList_ntabtyp(1, REF(StckItem), 10, 1) FROM Stock_objtab StckItem WHERE StckItem.StockNo = 1004,
NULL
[code]...
The first insert statement above produces the following error:
SQL Error: ORA-00933: SQL command not properly ended
The second insert statement above produces the following error:
SQL Error: ORA-00936: missing expression
successfully insert values into the LineItemList_ntab nested table?
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