Nested Tables or Varrays

Could some please let me know the differences between nested tables and varrays?

Check out
http://www.unix.org.ua/orelly/oracle/prog2/ch19_01.htm

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Using nested tables and varrays in Forms/Reports6i

Hi! Could anybody give practical examples of applications based on nested tables and varrays in Forms/Reports6i.
The possible schema of building user interface and so on.
Thank you.
[email protected]

Hi,
Varrays and nested tables are not supported within Forms6i and Reports6i. This means tare is no way to use it.
Frank

Nested tables and varray

hi friends,
i have a question:
why do we use nested tables and varrays?

Read the following and try to understand the examples. Try to relate them to various situations or scenarios where you can implement them. You will understand the benefits.
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14261/collections.htm#LNPLS005
http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14261/tuning.htm#LNPLS01205

Problems passing a nested table or Varray as a parameter

Hi,
could some one please show me the code for passing a varray or a table as a parameter in a PL/SQL function or procedure.
I have tried a number of ways but am not getting anywhere fast. A small bit of sample code that shows a function that takes a table/varray as a parameter and uses it to do something, and code also for the method that calls this function which demonstrates how the table/varray is created and passed.
I have a good idea how I think this should be done but cant get it to work in practice.
Thanks and happy new year!

sql >> CREATE OR REPLACE TYPE t_listachar
2 AS TABLE OF VARCHAR2(100)
3 /
Type created.
sql >> CREATE OR REPLACE PROCEDURE prcl_nested
2 (
3 p_Array IN t_ListaChar
4 )
5 IS
6 BEGIN
7 --
8 FOR i IN p_Array.FIRST .. p_Array.LAST LOOP
9 --
10 dbms_output.put_line('p_Array('||i||'): '||p_Array(i)) ;
11 --
12 END LOOP ;
13 --
14 END ;
15 /
Procedure created.
sql >> DECLARE
2 --
3 t_Array t_ListaChar := t_ListaChar('1','2','3','4','5') ;
4 --
5 BEGIN
6 --
7 prcl_nested(t_Array) ;
8 --
9 END ;
10 /
p_Array(1): 1
p_Array(2): 2
p_Array(3): 3
p_Array(4): 4
p_Array(5): 5
PL/SQL procedure successfully completed.

Unable to export nested tables and vaarys

Hai
How to export nested tables and varrays in oracle 8i (8.1.6) .When exporting nested tables and varrays not exporting .What is the advantage use of nested tables and varrays
Thanks in advance
mohan

Hello,
I think that with such a new release you should use DataPump (expdp/impdb) to
export Tables.
For exporting a complete Schema you may use the following syntax:
expdp {color:red}+user+{color}/{color:red}+password+{color} PARFILE=pfexport.txt_With pfexport.txt as bellow:_
SCHEMAS={color:red}+schema_name+{color}
FLASHBACK_TIME="TO_TIMESTAMP(to_char(SYSDATE,'DD-MM-YYYY HH24:MI:SS'),'DD-MM-YYYY HH24:MI:SS')"
CONTENT=ALL
DIRECTORY=EXP_DIR
DUMPFILE={color:red}+dump_file_name+{color}
LOGFILE={color:red}+log_file_name+{color}Then, in this example, you'll get the "dump file" and the "log file" into the EXP_DIR Oracle directory (if it exists).
You can check your Oracle Directories with the following query:
select * from dba_directories;Then, you can use one of these Directories or create a new one with the following statement
CREATE OR REPLACE DIRECTORY {color:red}+directory_name+{color} AS '{color:red}+directory_path+{color}';
GRANT READ,WRITE ON DIRECTORY {color:red}+directory_name+{color} TO {color:red}+user_name+{color};Hope it can help,
Best regards,
Jean-Valentin
Edited by: Lubiez Jean-Valentin on Nov 28, 2009 12:08 PM

Passing table of varray to a procedure

Hi,
I have a procedure which takes the following parameters:
create or replace
PROCEDURE VECTORSUMMARYSTATISTICS
chartOption IN CHARTOPTION,
userChoicedate IN C_TAB,
AllCases IN boolean,
strVector_id VARCHAR2,
strEntityName VARCHAR2,
CollectionName VARCHAR2
) AS
C_TAB is a type created on the database:
create or replace
TYPE C_TAB AS TABLE OF C_REC;
And C_REC:
create or replace
TYPE C_REC AS OBJECT
time_value TIMESTAMP
In the body of the procedure I am using the table "userChoicedate" in the following way:
for idx in userChoicedate.first..userChoicedate.last
loop
tuserdate_rec:=userChoicedate(idx); //table passed from the parameter
tuserdate.extend(1);
tuserdate(idx):=tuserdate_rec;
end loop;
where tuserdate_rec is declared in the following way:
--record for holding a single user date
tuserdate_rec C_REC;
Before executing this procedure from pl/sql I am filling some test date from another pl/sql page:
percRec2 C_REC;
result_tab C_TAB;
result_tab:=C_TAB();
result_tab.extend(10);
percRec2:=C_REC(TO_TIMESTAMP('01-01-2004 12:00:00.000', 'DD-MM-YYYY HH:MI:SS.FF3') );
result_tab(1):=percRec2;
percRec2:=C_REC(TO_TIMESTAMP('01-04-2004 12:00:00.000', 'DD-MM-YYYY HH:MI:SS.FF3') );
result_tab(2):=percRec2;
percRec2:=C_REC(TO_TIMESTAMP('01-07-2004 12:00:00.000', 'DD-MM-YYYY HH:MI:SS.FF3'));
result_tab(3):=percRec2;
percRec2:=C_REC(TO_TIMESTAMP('01-10-2004 12:00:00.000', 'DD-MM-YYYY HH:MI:SS.FF3'));
result_tab(4):=percRec2;
So when calling the procedure:
VECTORSUMMARYSTATISTICS(ch,result_tab,FALSE,'WBHP','PRD3','CaseCollection1');
I am getting the following error message:
Error report:
ORA-06531: Reference to uninitialized collection
ORA-06512: at "SIMSERVER.VECTORSUMMARYSTATISTICS", line 184
ORA-06512: at line 54
06531. 00000 - "Reference to uninitialized collection"
*Cause: An element or member function of a nested table or varray
was referenced (where an initialized collection is needed)
without the collection having been initialized.
*Action: Initialize the collection with an appropriate constructor
or whole-object assignment.
So here at this line in bold the problem is:
For idx in userChoicedate.first..userChoicedate.last
loop
tuserdate_rec:=userChoicedate(idx);
tuserdate.extend(1);
tuserdate(idx):=tuserdate_rec;
end loop;
Any help
Thanks
Message was edited by:
user646975

Hi,
Are u sure cause always the procedure is not compiling
This time I got the following problem:
Error(182,11): PLS-00103: Encountered the symbol "(" when expecting one of the following: in The symbol "in" was substituted for "(" to continue.
Error(320,71): PLS-00103: Encountered the symbol "GROUP" when expecting one of the following: , from into bulk

Using Nested Table in Select Statement

Hi all ,
Can i use the PL/SQL nested table or Varray
in the select statement as a normal table joined with other database tables.
i.e.
I have a nested table NT_1 in PL/SQL proc
i have to use this NT_1 in the select statement as
select xxx from
tab_1,
tab_2,
NT_1
where
< some conditional joins >.
Please help me in this regard.
regds
Dhananjaya.H

you can not use a varray as part of a SQL Statement in order to build joins.
Can you explain better what do you want to do ?
Joel P�rez

Problem in truncate/drop partitions in a table having nested table columns.

Hi,
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). Can anybody help me telling 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 help?
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)?
Thanks in advance.

>
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). Can anybody help me telling how I will be able to truncate/drop partition from this table?
>
Unfortunately you can't do those operations when a table has a nested table column. No truncate, no drop, no exchange partition at the partition level.
A nested table column is stored as a separate table and acts like a 'child' table with foreign keys to the 'parent' table. It is these 'foreign keys' that prevent the truncation (just like normal foreign keys prevent truncating partions and must be disabled first) but there is no mechanism to 'disable' them.
Just one excellent example (there are many others) of why you should NOT use object columns at all.
>
IF I change column types from nested table to varray type, will it help?
>
Yes but I STRONGLY suggest you take this opportunity to change your data model to a standard relational one and put the 'child' (nested table) data into its own table with a foreign key to the parent. You can create a view on the two tables that can make data appear as if you have a nested table type if you want.
Assuming that you are going to ignore the above advice just create a new VARRAY type and a table with that type as a column. Remember VARRAYs are defined with a maximum size. So the number of nested table records needs to be within the capacity of the VARRAY type for the data to fit.
>
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)?
>
Sure - just CAST the nested table to the VARRAY type. Here is code for a VARRAY type and a new table that shows how to do it.
-- new array type
CREATE OR REPLACE TYPE ARRAY_T AS VARRAY(10) OF VARCHAR2(64)
-- new table using new array type - NOTE there is no nested table storage clause - arrays stored inline
CREATE TABLE partitioned_table_array
     ( ID_ INT,
      arra_col ARRAY_T )
     PARTITION BY RANGE (ID_)
     ( PARTITION p1 VALUES LESS THAN (40)
     , PARTITION p2 VALUES LESS THAN(80)
     , PARTITION p3 VALUES LESS THAN(100)
-- insert the data from the original table converting the nested table data to the varray type
INSERT INTO PARTITIONED_TABLE_ARRAY
SELECT ID_, CAST(NESTED_COL AS ARRAY_T) FROM PARTITIONED_TABLENaturally since there is no more nested table storage you can truncate or drop partitions in the above table
alter table partitioned_table_array truncate partition p1
alter table partitioned_table_array drop partition p1

Nested Tables select query soooooo slow

I know that varrays are supposed to be used for small arrays. But, we are comparing nested tables to varrays and two table joins. Nested table query is unimaginably ,unacceptably slow.
Is there anybody else out there who experienced the same thing. Are there ways to speed up the select queries.(besides indexes)

If you try to use nested sql statement. Please be sure to setup the index to some specific tables inside oracle
Doing this will speed up your performance about 5 ~ 9 times original.
[email protected]

Tables in memory (Nested tables ?)

For performance reasons, I would like to insert, update, etc...
a table in memory. Can I use a nested table as if it was a
normal table ? Can I do updates on nested tables with values
from normal database tables ??
Statement like : Update <nested-table> set <nested-
table>.x=<value> where <nested-table>.y = <normal-table>.y
Thanks for a quick response.

The answer is yes and no.
A nested table is a "collection" and can be referenced in a SQL
statement using the pseudo-functions THE, CAST, MULTISET and
TABLE. The nested table and varray collections can be a column
in a database table (Oracle8) and are persistent. SQL
statements cannot act on memory held nested tables, varray and
index-by collections, which are transient. Index-by collections
are same as the older PL/SQL tables.
SQL statements cannot operate directly on transient collections.
For speed you can define an index-by collection as a table of
rowtype, and move data back and forth from database tables and
memory held tables using SQL. Records and index-by tables are
more efficient in Oracle 8 than in Oracle 7
In PL/SQL you can use replacement (:=) on the record or
record.column of the rowtype index-by collection. The downside
is you have to keep track of your own indexing which is only
BINARY_INTEGER, no SELECT, UPDATE, INSERT using FROM and WHERE
on transient collections. This works in Oracle 7 also.
Good Luck.

How to use nested tables object in oracle form

Hello forum
How all r u ..
i need ur help guys, pls help me out...
i m using an object oriented approach to design my database by using nested tables and
varrays. it is quite done successfully.
but the problem is when i m trying to use that object of nested table into the datablock of the form it is not been added to item list of that block.
so what is the proper way to use these type of objects to the form.
all ideas are welcomed and vry much required.
pls give example if possible so easy to understand or have any demo form related to above case then pls post me to my id i.e [email protected]
thank u all and expecting some expert solutions

Hello Francois Degrelle...
How r u doing ... i have searched the forum abt the above mentioned topic then i found that u have some demo form which will help out to explain the functionality of the nested table in forms ..
will u pls me that form to my i.e [email protected] pls mail all the detail u have regarding using nested tables to forms and reports
lots of thanks to u n advance.

Nested Table

Hi All
Description:
I use oracle 8.1.7
table
vouchz(7,000,000 records),
unique index (vz_major, vz_minor)
type
create or replace type taccrec is object
(acc_major number(4),
acc_minor number(8));
create or replace type tacctbl is table of taccrec;
Example1:
declare
acctbl$ tacctbl := tacctbl();
accrec$ taccrec := taccrec(null,null);
sumval number;
begin
acctbl$.extend;
accrec$.acc_major := 8148;
accrec$.acc_minor := 49;
acctbl$(acctbl$.last) := accrec$;
select sum(vz_crval-vz_dbval)
into sumval
from vouchz
where (vz_major, vz_minor) in (select acc_major, acc_minor from
table(cast(acctbl$ as tacctbl)));
end;
Done in 200 second
Example2:
declare
sumval number;
begin
select sum(vz_crval-vz_dbval)
into sumval
from vouchz
where vz_majo = 8148
and vz_minor = 49;
end;
Done in 1 second;
how can i increase the run time speed of Example1?
why join of nested table and table is too late?
is there any database configuration parameter for this?
With BestRegards.

Hi:
Thanks !! Can nested table or varray to be use in form9i ??
sean

Varray, Nested Table and Object types in OWB r2

Requirement:
Flat file with repeating groups of nested content need to move into Object Relational ORACLE table (using varray or nested tables - no preference). The data will be loaded, then mapped/transformed into a richer O-R output to directly produce XML outputs.
Problem:
Generated PL/SQL "seems" to do the correct thing, but deployment errors show failures on mapping of collections (varrays, NTs or OTs) and in sqlplus recompiling the PKB still gives the errors. Is this a PL/SQL generator error, or is there a more meaningful example of using CONSTRUCT OBJECT operator than the embedded odcumentation - it is a simple type (single instance) and not a variable repeating group of nested data.
Anyone had any success with these, or know of any collateral to assist in the process. Thanks.

The process we are following is very simple. We are talking 10 columns from a source flat file table and wish to map this into a Varray/Nested table, with one column of Varchar2(10).
When you create your map in OWB, select the construct object, you have to choose an object type - it does not allow you to select a VARAAY or NESTED table.
I have then created an object defined in the same structure as the VARRAY/NESTED table - I have then made the VARRAY/NESTED table of this TYPE.
Example:
CREATE OR REPLACE TYPE "O_REL_PUB_INDEX" AS OBJECT (
X_REL_PUB_INDEX_1 VARCHAR2(10))
CREATE OR REPLACE TYPE "V_REL_PUB_INDEX" AS VARRAY(15) OF O_REL_PUB_INDEX
In OWB you can then select O_REL_PUB_INDEX when creating the 'Contruct Object'.
The problem I have is that when I map to my target column of type V_REL_PUB_INDEX and DEPLOY my map I get the following errors taken from OWB control centre
Name
Action
Status
Log
TEST
Create
Warning
ORA-06550: line 2931, column 9:
PL/SQL: SQL Statement ignored
TEST
Create
Warning
ORA-06550: line 3174, column 11:
PL/SQL: ORA-00932: inconsistent datatypes: expected OWB_USER.O_REL_PUB_INDEX got OWB_USER.V_REL_PUB_INDEX
TEST
Create
Warning
ORA-06550: line 401, column 7:
PL/SQL: SQL Statement ignored
TEST
Create
Warning
ORA-06550: line 643, column 13:
PL/SQL: ORA-00932: inconsistent datatypes: expected OWB_USER.O_REL_PUB_INDEX got OWB_USER.V_REL_PUB_INDEX
TEST
Create
Warning
ORA-06550: line 7221, column 9:
PL/SQL: SQL Statement ignored
TEST
Create
Warning
ORA-06550: line 7464, column 11:
PL/SQL: ORA-00932: inconsistent datatypes: expected OWB_USER.O_REL_PUB_INDEX got OWB_USER.V_REL_PUB_INDEX
Any ideas? anyone succesfully mapped to either a VARRAY or an NESTED TABLE target column?

Varrays/Nested tables/temp tables

Within my PL/SQL code, which I eventually will turn into stored procedure, I want to use Varrays, or Nested tables, or temp tables, whatever is the most suitable.
Right now I am using dbms_output.put_line() just to display list of 1 column values. Further, I need to use this list in Where ... In (my list ) of other query.
Prior to Oracle, I worked with SQL Server and I have always used temp table in such situations. But in Oracle it does not seem like good solution.
Could please someone explain me what object should I use in this situation, and what's more important, code examples how to assign values to it, and how to apply Select against this object.
Thanks.

create or replace type ttab_object_type is table of varchar2(18);
show errors
declare
type ttab_object_name is table of user_objects.object_name%type index by binary_integer;
tab_object_name ttab_object_name;
tab_object_type ttab_object_type;
begin
tab_object_type := ttab_object_type('TABLE', 'INDEX');
select object_name
bulk collect into tab_object_name
from user_objects
where object_type in (select * from table(tab_object_type));
for i in 1.. tab_object_name.count loop
dbms_output.put_line(tab_object_name(i));
end loop;
end;
Richard

Reg:varray & nested table.

Dear Friends,
How varray & Nested table working internally in oracle.?
When & Why to use varray & nested table.?
Which is the faster from both of them.?
Thanks.

Hmm, mysterious. It works for me on my 9.2.0.6 dB...
SQL> CREATE OR REPLACE TYPE TY_BOOKS AS OBJECT( VC_BOOK_NAME VARCHAR2(64) );
2 /
Type created.
SQL> CREATE OR REPLACE TYPE NT_TY_BOOKS AS TABLE OF TY_BOOKS;
2 /
Type created.
SQL> CREATE TABLE STUDENT
2 ( SID NUMBER(10),
3 CL_NT_BOOKS NT_TY_BOOKS)
4 NESTED TABLE CL_NT_BOOKS STORE AS CL_NT_BOOKS_TAB;
Table created.
SQL> INSERT INTO student VALUES (1000, NT_TY_BOOKS(TY_BOOKS('Science')))
2 /
1 row created.
SQL> INSERT INTO student VALUES (1001, NT_TY_BOOKS(TY_BOOKS('Science'),TY_BOOKS('Maths')))
2 /
1 row created.
SQL>
SQL> SELECT S.SID,B.VC_BOOK_NAME FROM STUDENT S, TABLE(CL_NT_BOOKS) B
2 WHERE B.VC_BOOK_NAME='Science'
3 /
       SID VC_BOOK_NAME
      1000 Science
      1001 Science
SQL> What I suggest is most likely to have happened is that you have added a space or some other non-printing cahracter into the book name when you inserted row 1001. If this is not the case then you'll have to do it again in SQL*Plus, cut teh output and paste it here, so we can see what's going on.
Cheers, APC

Nested Tables or Varrays

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