Refreshment Slow / Dropping Materialized View Metdata

Jan 6, 2013

I had to drop the MV with preserve table and rebuilt it after modifcation of materalized table.Before dropping the materialized view metdata was.

CREATE MATERIALIZED VIEW "DM_TGT_SHARED"."EA_MERGED_DATA_MV"
  ORGANIZATION HEAP PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
  STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
  PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
  TABLESPACE "DM_TGT_SHARED"
  BUILD IMMEDIATE
  USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255
 [code]...

now this view taking an ages to refresh as before , there is a MV log i suspect i did not use "with rowid" clause when rebuilding the materliazed view , how can i add with rowid clause which i reckon will improve the MV refreshment.

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Apr 15, 2010

I have created a MV joining 10 tables with FAST REFRESH ON COMMIT It made my sytem very slow.

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Jun 28, 2009

I created a Materialized view using joining of two tables with FAST REFRESH ON COMMIT option. These tables are the main tables of the DB and contains alot of data(about 15 millions of records). two master tables have index but mview doesn't have any indexes. I've thought the entire concept of the fast refresh is that it should be a relatively quick operation but the result showed that DB performance reduced, for example I could insert 900 records per minute thru application into master tables before but now I can just insert about 400 records per hour!.Also, It slows down the select operation, went from 0.11 seconds(with joining two tables) to 33 seconds (in mview)!.

First of all, I considered following possibilities and test them:

1) The most likely solution was that a complete refresh was happening. However, the materialized view refresh was confirmed to be a fast refresh by querying USER_MVIEWS.

2) I checked the query of the materialized view and confirmed that it was a simple select from the master tables without any aggregation or sorting.

3) DBMS_MVIEW.explain_mview was run on the materialized view. MV_CAPABILITIES_TABLE did not reveal any problems.

4) A query of dba_registered_snapshots showed that no other snapshots appeared to be using these logs. So, After each refresh, the records in mview logs were deleting.

As you see, it seems everything is ok, but what was causing this fast refresh to go so slow?

I use oracle 10.2 on Suse Linux enterprise server.

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When I try to join the two tables :

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However, in the execution plan, I can't see where Oracle takes time to achieve the query :
Plan hash value: 907176690

[code]....

Predicate Information (identified by operation id):

2 - access("T2"."INTE_REF"="T1"."INTEREF" AND "T2"."NE_REF"="T1"."NEREF" AND
"T2"."INTE_INST"="T1"."INSTANCE")

Note- dynamic sampling used for this statement (level=2)

Statistics
-----------------------------------------------------------
3 user calls
0 physical read total bytes
0 physical write total bytes
0 spare statistic 3
0 commit cleanout failures: cannot pin

[code]....

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*
Error at line 1:
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/
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[code]....

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AS
SELECT F1,
F2,
F3
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CODEDROP TYPE MY_MAT_VIEW_table_type;
DROP TYPE MY_MAT_VIEW_row_type;

CREATE TYPE MY_MAT_VIEW_row_type AS OBJECT
(
F1 number,
F2 varchar2(100),
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Is there a way to avoid such "delay" while materialized view is refreshing?

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