Delete vs truncate on materilized view

is it possible to truncate materilized view? if yes, is it faster than using delete from materialized view?
thanks.

user8837158 wrote:
is it possible to truncate materilized view? YES, for example;
dbms_mview.refresh( 'MY_MVIW_NAME' , 'C', atomic_refresh => FALSE ); => This does a TRUNCATE
if yes, is it faster than using delete from materialized view? Yes it is faster ; TRUNCATE is a DDL, no need as much undo as a DELETE, where a DELETE is a DML
DELETE operation will cause all DELETE triggers on the table to fire. Where with TRUNCATE no triggers will be fired.
thanks.

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Disable delete button in a maintenance view

Hi,
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Hello Moises
The problem with this solution is that if you ever need to modify your maintenance view (i.e. regenerate the dynpros because you may want to add new fields) your coding is gone.
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Hi,
I have a requirement to create a Form by using Complex View. Insertion is possible but updation and deletion is not working properly . I got FRM-40501 Error. I need How to update or delete records in a Complex View in Forms?
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Dear Sir/Madam,
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This is a standard maintenance view , used in MBLB report.
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REPORT             TABLE NAME     FIELD NAME
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RM07DOCS         MKPF                 BLDAT
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RM07DOCS         MSEG                 ANLN1
RM07DOCS         MSEG                 ANLN2
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Dear Sir,
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hense i went through writing a program to delete the records from table mmim_rep_cust
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program logic :
delete from mmim_rep_cust
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if sy-subrc = 0.
write ' RECORDS DELETED SUCCESSFULLY'.
else.
write ' RECORD NOT FOUND'.
endif.
please guide me to delete the records from the view.
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Dastagiri.

Deleting entries from a Standard View

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Then it becomes complicated. Are you trying to delete the duplicates from a view? Then look at your view definition and see if you can avoid duplicates by changing its selection criteria. Also take note of Rob's comment.
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Delete or Truncate statement for data purging

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SandyLeo

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Rename & deletion of planning book & Data view

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Delete vs truncate

Hi,
We are using Oracle and we have a daily job of loading data to a table.
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If any error occurs i need to have old data ie previous load in my table.
so which option should i use? Delete or truncate
Thanks
Harshini

Given this requirement:
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Add local indexes to your work_table, that are the same type and cover the same columns as the indexes on your target_table.
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iPad Storage Solutions
http://www.ipadstoragesolutions.com/iPadWirelessStorage.php
SanDisk Connect Wireless Media Drive http://www.sandisk.com/products/wireless/media-drive/
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Expand your iPad's storage capacity with HyperDrive
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Materilized Views

Dear All,
Can you tell me exactly what is the difference between Materilized View and snap shots.
when to opt for materilized views.
Regards
VNK

Hello VNK,
despite the changes in handling and maintainability of materialized views over the past db versions,
the main difference lies in a feature called 'query rewriting'.
When adding a materialized view to a schema, the cost based optimizer is able to decide
whether to select from the materialized view or the underlying tables without a change in the application code.
MV's are generally used in DSS / Data Warehousing environments rather than in OLTP applications.
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DELETE, DROP, TRUNCATE의 비교

제품 : ORACLE SERVER
작성날짜 : 1998-06-23
DELETE, DROP, TRUNCATE의 비교
=============================
TABLE에서 행을 삭제하는 세 가지 OPTION의 비교
TABLE에서 모든 행을 삭제하는 방법에는 다음과 같은 세 가지 OPTION이 있다.
1. DELETE 명령어 사용
     DELETE 명령어를 사용하여 TABLE의 행을 삭제할 수 있다.
     예를 들어 EMP TABLE에서 모든 행을 삭제하는 명령문은 다음과 같다.
     DELETE FROM emp;
     O. DELETE 문을 사용할 때 TABLE이나 CLUSTER에 행이 많으면 행이 삭제
될 때마다 많은 SYSTEM 자원이 소모된다. 예를 들어 CPU 시간, REDO
LOG 영역, TABLE이나 INDEX에 대한 ROLLBACK SEGMENT 영역 등의 자
원이 필요하다.
     O. TRIGGER가 걸려 있다면 각 행이 삭제될 때 실행된다.
     O. 이전에 할당되었던 영역은 삭제되어 빈 TABLE이나 CLUSTER에 그대로
남아 있게 된다.
2. DROP 과 CREATE 명령어 사용
     TABLE을 삭제한 다음 재생성할 수 있다. 예를 들어 EMP TABLE을 삭제하
고 재생성하는 명령문은 다음과 같다.
     DROP TABLE emp;
     CREATE TABLE emp (......);
     O. TABLE이나 CLUSTER를 삭제하고 재생성하면 모든 관련된 INDEX,
CONSTRAINT,TRIGGER도 삭제되며, 삭제된 TABLE이나 CLUSTERED
     TABLE에 종속된 OBJECTS는 무효화 된다.
     O. 삭제된 TABLE이나 CLUSTERED TABLE에 부여된 권한도 삭제된다.
3. TRUNCATE 명령어 사용
     SQL명령어 TRUNCATE를 사용하여 TABLE의 모든 행을 삭제할 수 있다.
     예를 들어 EMP TABLE을 잘라내는 명령문은 다음과 같다.
     TRUNCATE TABLE emp:
     O. TRUNCATE 명령어는 TABLE이나 CLUSTER에서 모든 행을 삭제하는 빠르
고 효율적인 방법이다.
     O. TRUNCATE 명령어는 어떤 ROLLBACK 정보도 만들지 않고 즉시 COMMIT
한다.
     O. TRUNCATE 명령어는 DDL 명령문으로 ROLLBACK될 수 없다.
     O. TRUNCATE 명령문은 잘라 버릴 TABLE과 관련된 구조(CONSTRAINT,
     TRIGGER 등)과 권한에 영향을 주지 않는다.
     O. TRUNCATE 명령문은 현재 TABLE에 할당된 영역을 잘라버린 후에 포함
되는 TABLESPACE로 복귀되도록 지정한다.
(REUSE STORAGE, DROP STORAGE OPTION 사용)
     - DROP STORAGE OPTION 사용 시 : TABLE EXTENTS 수를 MINEXTENTS의
     원래 설정값으로 줄인다.
               해제된 확장영역은 SYSTEM에 복귀되며,
          다른 OBJECTS가 사용할 수 있다.
- REUSE STORAGE OPTION 사용 시 : 현재 TABLE이나 CLUSTER에 할당된
모든 영역이 할당된 채로 남아 있도록
지정한다.
     O. TRUNCATE 명령문이 TABLE에서 ROW를 삭제하면 해당 TABLE에 걸려 있는
TRIGGER는 실행되지 않는다.
     O. AUDIT 기능이 ENABLE되어 있으면, TRUNCATE 명령문은 DELETE 문에 해
당하는 AUDIT 정보를 생성하지 않는다. 대신 발생한 TRUNCATE 명령문
에 대한 단일 AUDIT RECORD를 생성한다.
* HASH CLUSTER는 잘라버릴 수 없다.
또한 HASH CLUSTER나 INDEX CLUSTER 내의 TABLE도 개별적으로 잘라버릴 수
없다.
INDEX CLUSTER를 잘라버리면 CLUSTER에 있는 모든 TABLE의 모든 ROW가 삭제
된다.
모든 ROW가 각각의 CLUSTERED TABLE에서 삭제되어야 한다면 DELETE 명령어를
사용하거나 TABLE을 삭제하고 재생성한다.

There Oracle says us about CASCADE keyword in ALTER TYPE ... DROP METHOD statement
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96540/statements_43a.htm#2078974
CASCADE Clause
Specify the CASCADE clause if you want to propagate the type change to dependent types and tables. Oracle Database aborts the statement if any errors are found in the dependent types or tables unless you also specify FORCE.
Try to find the dependences between your super - and subtypes.
It would be better if you specify your complete objects
hierarchy in the example.
Rgds.

Deleting data from a table view

I have a data source that is in dictionary form (for why, see here). I have the following code that gets called in the commitEditing method for the table view:
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break;
case 1:
dNSLog (@"Case One");
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break;
case 5:
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case 6:
section = @"G";
break;
case 7:
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case 8:
section = @"I";
break;
case 9:
section = @"J";
break;
case 10:
section = @"K";
break;
case 11:
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break;
case 12:
section = @"M";
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case 13:
section = @"N";
break;
case 14:
section = @"O";
break;
case 15:
section = @"P";
break;
case 16:
section = @"Q";
break;
case 17:
section = @"R";
break;
case 18:
section = @"S";
break;
case 19:
section = @"T";
break;
case 20:
section = @"U";
break;
case 21:
section = @"V";
break;
case 22:
section = @"W";
break;
case 23:
section = @"X";
break;
case 24:
section = @"Y";
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section = @"Z";
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default:
dNSLog (@"Default");
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NSArray *array = [[NSArray alloc] initWithArray:arrayForNameSection];
[mutableDataDictionary setObject:array forKey:section];
listContent = [NSDictionary dictionaryWithDictionary:mutableDataDictionary];
[array release];
[arrayForNameSection release];
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[mutableDataDictionary release];
The code works flawlessly the first time through, but when I try to delete a second item, it crashes with a CALayer exception involving copyWithZone. The analyzer in Xcode (3.2) is telling me something's going on with the NSString section, but I'm not sure what...I'd appreciate any help!
BTW, Ray if you happen to get this, the code is identical to what I emailed you, except that I added this code. The method name is the same.

I have a data source that is in dictionary form (for why, see here). I have the following code that gets called in the commitEditing method for the table view:
- (void)removeObjectFromListAtIndex:(NSIndexPath *)indexPath {
NSMutableDictionary *mutableDataDictionary = [[NSMutableDictionary alloc] initWithDictionary:[listContent mutableCopy]];
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dNSLog (@"listContent: %@, mutableDataDictionary: %@", listContent, mutableDataDictionary);
dNSLog (@"indexPath.section is %d", indexPath.section);
NSString *section = [[NSString alloc] init];
// Memory leak because in all cases you re-assign the variable.
// Arrrgggg!
NSString * section = nil;
if((indexPath.section >= 0) || (indexPath.section < 26))
section = [NSString stringWithFormat: @"%c", 'A' + indexPath.section];
switch (indexPath.section) {
case 0:
dNSLog (@"Case Zero");
section = @"A";
break;
case 1:
dNSLog (@"Case One");
section = @"B";
break;
case 2:
section = @"C";
break;
case 3:
section = @"D";
break;
case 4:
section = @"E";
break;
case 5:
section = @"F";
break;
case 6:
section = @"G";
break;
case 7:
section = @"H";
break;
case 8:
section = @"I";
break;
case 9:
section = @"J";
break;
case 10:
section = @"K";
break;
case 11:
section = @"L";
break;
case 12:
section = @"M";
break;
case 13:
section = @"N";
break;
case 14:
section = @"O";
break;
case 15:
section = @"P";
break;
case 16:
section = @"Q";
break;
case 17:
section = @"R";
break;
case 18:
section = @"S";
break;
case 19:
section = @"T";
break;
case 20:
section = @"U";
break;
case 21:
section = @"V";
break;
case 22:
section = @"W";
break;
case 23:
section = @"X";
break;
case 24:
section = @"Y";
break;
case 25:
section = @"Z";
break;
default:
dNSLog (@"Default");
section = nil;
break;
if (mutableDataDictionary) {
NSMutableArray *arrayForNameSection = [[[NSMutableArray alloc] initWithArray:[mutableDataDictionary objectForKey:section]] mutableCopy];
// Get rid of this copy too.
[arrayForNameSection removeObjectAtIndex:indexPath.row];
NSArray *array = [[NSArray alloc] initWithArray:arrayForNameSection];
[mutableDataDictionary setObject:array forKey:section];
listContent = [NSDictionary dictionaryWithDictionary:mutableDataDictionary];
// This is autoreleased. You might want to retain it.
[array release];
[arrayForNameSection release];
[section release];
[mutableDataDictionary release];

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Please help in getting netflix to work on iPad

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Delete vs truncate on materilized view

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