On a huge transaction the buffer cache gets fulled and on that case oracle automatically writes to the data files. And as such when we issue commit statement it does not take more time. It only writes the dirty buffers to the dirty buffers to the datafiles.
When we rollback does the data gets erased from the datafile. What is the mechanism of rolling back ? It should be clearing the dirty buffers for sure.
, which operator is more costly (Commit or Rollback) in terms of performance?
View 5 Replies View RelatedHow to rollback after commit.
View 5 Replies View RelatedOne of the users received the error
ora-01555: rollback segment too small
I have read about the error and saw that it is caused by transactions made upon same data, filling to maximum one of the UNDOTBS rollback segments.It happens only once in a while, each time on a different Rollback Segment.
I've read that i should do a few things to enlarge those segments, such as bring a 1. segment offline, 2. drop it and then 3. create it with a bigger size & possibly a bigger extent setting
i've also read that those actions aren't relevant if you have the parameter UNDO_MANAGEMENT set on AUTO, which is actually the case.is that why when i execute ALTER ROLLBACK SEGMENT RB_SEG_NAME_11$ OFFLINE;
1. How do i solve my issue with the Rollback segment being too small to contain the snapshot with the requested SCN?
2. what does the parameter UNDO_MANAGEMENT mean? should i change it, in order to adjust my Rollback Segments attributes, to prevent my error of re-occurring?
I have created a sql loader control file to load a delimeter file in a table.
The file gets loaded into the table properly, however the commit is happening for every 64 records.
My aim is to rise the commit count by 1000 records.
i have a problem that i have run a script in a database which is generated after taking diff from another same structured database and exit normally from sql prompt then is there anyway in oracle to rollback this whole script(means want to make database as it was before running script) or not?
View 2 Replies View RelatedHaving PL/SQL procedure and calling sys dba procedure to alter rollback segment to online and after that to set the transaction to this rollback. The rollback altered to online but transaction still running on available rollback and not the one I was meant to. The user have executing grant on the sys dba procedure.
View 21 Replies View Relatedwhen i enter a sql * plus session an do a rollback; (without performing anything), always a "rollback complete" message appears even if there is nothing to rollback.
View 4 Replies View RelatedI have found one interview question no.7 @ [URL] According to that it can be rollbackQuote:The truncate command is a DDL operation and just moves the high water mark and produces few rollback data.
But, I read That is not true in the case of oracle but it is true in the case of SQL Server.
I have an issue that whenever i restart my system, one of my rollback segment goes offline.
View 8 Replies View RelatedUser got ORA-01555 error , And My database is runnong with rollback segments ?
User got following error ? ORA-01555 'UNABLE TO EXTEND ROLLBACK SEGMENT RBS_O4'
After that I try like this :
prd176> ALTER ROLLBACK SEGMENT RBS_04 STORAGE (MAXEXTENTS 65530);
ALTER ROLLBACK SEGMENT RBS_04 STORAGE (MAXEXTENTS 65530)
ERROR at line 1:
ORA-02221: invalid MAXEXTENTS storage option value
What I have to do? means complete command ?
here I am pasting my db information;
prd176> SELECT SEGMENT_NAME,TABLESPACE_NAME,FILE_ID,MAX_EXTENTS,MIN_EXTENTS
FROM DBA_ROLLBACK_SEGS
2 3 ;
[code]...
While taking backup of schema using Expdp, I got the following error on one of the tables in the schema due to which export for this table could not be done.
Re: ORA-01555: snapshot too old: rollback segment number 2 with name "_SYSSMU2$" too small.
Undo retention time is 14400 sec and Undo Tablespace is Auto Extensible. Table to be exported contains 100 crore rows.
I need to do the following via the sql plus command prompt :
1. Execute a large ".pls" script file which does various inserts and updates to a table.
2. Spool the output of "select * from updatedtable;" to a text file to see the changes made.
3. Rollback all the updates and inserts in the script.
How to check/find the size of current ROLLBACK segment in oracle 10g ?
View 20 Replies View RelatedI have a active rollback segments. I am not able to drop the undo tablespace of this segment and archive logs are getting created.
View 2 Replies View RelatedI have a standard workflow process which was started but got completed without performing all the process.The process had to generate two(Comments & Approval) notifications but generated only one & as the user responded to the notification it got completed without invoking the approval process.Now I need the workflow to be rolled back to the initial step to restart the whole process again.
View 1 Replies View Relatedi'm a student currently learning database administration security.
I need to create a tablespace for administration of database but i don't know what datafile settings are best suited for admin usage.
I have attached the schema that was given to me for this assignment.
How can we commit for every 500 rows in pl/sql block.
begin
for i in 1 to 10000
loop
Insert into t1 values(i);
commit;
end loop;
end;
Here I am commiting after all the rows are inserted ,but i want to commit for every 500 rows are inserted .
Can commit be used in trigger or not ?
If so, Can it be used directly or indirectly?
I have this stored procedure and sequences:
create sequence a_seq;
create sequence b_seq maxvalue 26 cycle;
create sequence c_seq maxvalue 1000 cycle;
create or replace
procedure inserta_en_B (numregistros in integer) as
ultimo_año_nuevo date := trunc (sysdate,'year');
dias_transcurridos number(3) := sysdate - ultimo_año_nuevo;
begin
[code]........
First i insert into b 400000 rows using:
execute inserta_en_b(400000));
commit;
But then i need to insert 100000 rows more using the stored procedure and without removing the 400000 rows stored before. I think i need to use the commit clause, but i dont know where.
Can we use commit in a function?
View 10 Replies View RelatedTell me restriction on commit means where this keyword is not used....like i somewhere read in trigger we can't used commit...instead of that we use pragma autonomous_transaction..
but my confusion arise when i see commit used in trigger in our database table....
is commit used in trigger , if not then what will be use...
Another one is commit used while creating procedure or function?
I have written a purge package that would delete records older than 10 years. Since the data is huge, the purging was taking 14 hours plus. To improve performance, I disabled constraints , deleted records and then reanabled them. This was quite quick but the only problem is rollback. Say for some reason if enabling constraints fails there is no way to rollback as enabling and disabling constraints does an implicit rollback.
View 1 Replies View RelatedI am using commit in a trigger as given :
create or replace
trigger comt after insert on tbl_city
declare
pragma autonomous_transaction;
begin
commit;
dbms_output.put_line('Value is committed');
end;
Now when I perform an insert in tbl_city---->trigger fires properly and gives output stream. But If I perform rollback now --->there are the data rollbacked in table.
why?I think after commit(which is in trigger associated at insert to table)there should no any rollback in table.
I am using the SQL-Developer to access and manipulate a database. I am not very sure about the format of the database (I'm new to databases), but I had to setup the TNS-folder.
Anyway, I guess the problem is the same for any database.
I am having a table with the BOM (bill of material) positions of certain articles and I want to change the BOM quantities of some of the articles. What happens is that I can only change some of the rows. For other rows I get the message like (it is in German, so I try to translate it):
"data was commited in another/the same session already. row cannot be updated"
This error message looks like there is somebody else locked on the database and manipulating it, correct? Is that possible to see somewhere which processes/people are currently accessing to the database?
I saw that there is one process/another database, which is having the authorization to access to the database. But where can I check if this process is accessing to the database?
BTW: I used to do this process before, and it worked. I had been able to manipulate arbitrary entries on the database. I guess that the process or the person, mentioned above, hasn't been accessing to the database at that time.
I have made a correlated update statement using rowid. Find my attachment. Its updating all columns which i wanted but issue is that its not updating in 1st commit.
Suppose 6 rows is to be updated, then in 1st commit its updating 1 record, then in 2nd commit its updating 2nd record and so on. And in Toad its showing 6 rows updated in 1st commit, then 5 rows updated in 2nd commit and 1 rows updated in last record. I want that all records to be updated in first commit only.
why commit is not allowed in trigger?
View 3 Replies View RelatedI am calling a child form from a parent form.It works perfectly if the parent form is adding records and while entering records when i press the button to call the child form, the whole things work perfectly according to plan.
The problem begins when i run execute query command in the parent form and then call child form then it does not "commit_form". So this is my problem that child form does not work perfectly when parent form is being called in execute_query procedure.
My working:
1) I read in the documentation that When parent form status is query_only then child will also have the same mode regardless of the parameter given in call_form.So i checked the :SYSTEM.FORM_STATUS of both the parents and child form,it shows "CHANGED" hence this point is covered. (dont know how come the parent form is in changed status but at least it is doing my work)
2) I further read and found that Commit_form procedure make the :SYSTEM.FORM_STATUS as QUERY. Here i am facing problem as in child form when i make changes and press commit form. Then before commit_form and after commit_form the :SYSTEM.FORM_STATUS results in "CHANGED".You can see this in the following code which i have written in save button.
message(:SYSTEM.CURRENT_FORM || ' a ' ||:SYSTEM.FORM_STATUS); pause;
commit_form;
message(:SYSTEM.CURRENT_FORM || ' b ' ||:SYSTEM.FORM_STATUS); pause;
IF Form_Success THEN
Commit;
IF :System.Form_Status <> 'QUERY' THEN
Message('Error prevented Commit');
RAISE Form_Trigger_Failure;
END IF;
else
message('FAIL');
END IF;
exit_form;
then at last exit_form module shows that" i have unsaved data in the form" save Yes-No-Cancel?
I hv a situation where a webservice interacts with the database.
Here the webservice will first make a request to database for some operation but i dont want the database to commit changes in first request itself. A response will be sent to webservice further a second request will be sent to database for committing the changes. So can that be done?
What would be the best way to Commit after every 10 000 records inserted from one table to the other using the following script :
DECLARE
l_max_repa_id x_received_p.repa_id%TYPE;
l_max_rept_id x_received_p_trans.rept_id%TYPE;
BEGIN
SELECT MAX (repa_id)
INTO l_max_repa_id
[code].........