Locking during the generation and the online option to avoid problems

Hi Experts,

In our suite of applications, schemas are shared among several applications, and even when there is a deployment of an application, the other application remains upward. In this process, we are facing problems of locking. For example, when creating indexes, I get the error "resource busy and acquired with no expectations. This post is specific to this point on error when creating index (change the design of the app etc is out of reach for me currently).

I was checking the "online" option of create index and I was wondering if that helps. It looks promising for me. When we have large tables (50 million more and creating indexes on them takes about 5 minutes and at the same time we have another app doing short transactions - who commit in 5 seconds, then creating index 'with the option' can help - is what I was asking.)

Here is an example of what I've tried:

-- first create a table with a few million rows:

SET SERVEROUTPUT ON

DECLARE
  v_sql VARCHAR2 (200);
BEGIN
  v_sql := 'create table test as select * from dba_objects';

  EXECUTE IMMEDIATE v_sql;

  FOR i IN 1 .. 5
  LOOP
  v_sql := 'insert into test select * from test';

  EXECUTE IMMEDIATE v_sql;

  COMMIT;
  END LOOP;
END;
/

--Now in session 1:
---------


create index ti1 on test(OWNER,OBJECT_NAME,SUBOBJECT_NAME,OBJECT_ID,DATA_OBJECT_ID,OBJECT_TYPE,CREATED,LAST_DDL_TIME,TIMESTAMP,STATUS,TEMPORARY,GENERATED,SECONDARY,NAMESPACE)
online;

session 2:
------------
DELETE FROM TEST WHERE ROWNUM<1000;

commit;

DELETE FROM TEST WHERE ROWNUM<40200;
rollback;

--etc.

I find that deletions, etc. in the second session is done (they follow by commit and they take a few seconds) with this option 'create an index online '. The option 'create index' is also no error with the error ORA-«resource busy...» ». So what a better way to create indexes to avoid locking issues? Note that is is very good for us to have the creation of index take more time for what's important is that they are not lacking in critical production deployments.

Are there other possible implications (-except that it takes more time to create the index with the option 'online'), that one should be aware of? Any known issues or is there any other glitches with the creation of online index?

I will be grateful for any views on that.

What is your version of DB full?

In our suite of applications, schemas are shared among several applications, and even when there is a deployment of an application, the other application remains upward. In this process, we are facing problems of locking. For example, when creating indexes, I get the error "resource busy and acquired with no expectations.

OK-, this exception is not surprising. To create or rebuild an index, Oracle has a lock on the base table. He can't do that if other users perform DML on the table - it must wait.

And before 11 g ANY other session that then tries to perform DML on the base table that oracle wait will also block.

I was checking the "online" option of create index and I was wondering if that helps.

Well, if you do not use the clause of 'ONLINE' you must do that maintenance CONNECTION or you now cause other sessions cling while creating/reconstruction is made;

It looks promising for me. When we have large tables (50 million more and creating indexes on them takes about 5 minutes and at the same time we have another app doing short transactions - who commit in 5 seconds, then creating index 'with the option' can help - is what I was asking.)

Yes - it should help. But he cannot eliminate the problem entirely.

See this article by the Index indicated Richard expert Foote (there are many other related articles index also):

https://richardfoote.WordPress.com/2008/02/11/index-create-and-rebuild-locking-improvements-in-11g-ch-ch-ch-changes/

Tags: Database

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