Writable MVIEWS

Hi Experts,
What are the advantages of writable materialized views.
Please provide one business scenario when will we use writable materialized views.
Please help me.
Thanks in advance.

Oracle Docs:
Writeable Materialized ViewsA writeable materialized view is one that is created using the FOR UPDATE clause but is not part of a materialized view group. Users can perform DML operations on a writeable materialized view, but if you refresh the materialized view, then these changes are not pushed back to the master and the changes are lost in the materialized view itself. Writeable materialized views are typically allowed wherever fast-refreshable read-only materialized views are allowed.
>
Cheers,
Shaz
Edited by: Sh**** on Aug 22, 2012 12:05 PM

Similar Messages

FAST enabled MView takes ages to refresh

Hi All,
I have a materlialized view which is based on a single fact table ( OAS_BALANCE_UNIONED 11,445,156 rows) and a bunch of dimension tables each containing limited number of rows (a typical start schema).
The conditioins to make the mview fast refreshable have been met so the mview created successfully with the FAST option.
The mview then worked just fine after than and had been refreshing FAST (6 minutes) for the whole day till other mviews started to refresh in the same time. Some of those mviews read from some of the base tables of the mview in question. Since then, the mivew has started to take ages (3 hours) to refresh. There is surely something wrong because the COMPLETE refresh was faster than that.
Later, I stopped all the refresh jobs of the other mviews. Yet, the FAST mview still has the same problem of taking ages to refresh.
When I monitored the session that refreshes the mview, I noticed in the "Long Ops" that
most of the time is spent on a step named as "Hash Join" (it appears in the Message column). Hash join occurrs because of the outer join.
Why my FAST mview suddenly started to take so long time to refresh?
How can I make my FAST mivew really refresh fast?
Technical Details are below:
OS: Windows 2003 32-bit
DB version: Oracle 10g R1 ( 10.1.0.2.0 )
CREATE MATERIALIZED VIEW FACT_BAL_MV
BUILD DEFERRED
REFRESH FAST ON DEMAND
WITH PRIMARY KEY
AS
SELECT B.cmpcode BAL_KEY,
       B.CMPCODE,
       B.YR,
       B.PERIOD,
       B.BALCODE,
       B.CURCODE,
       B.REPBASIS,
       TO_NUMBER (B.YR || LPAD (B.PERIOD, 2, 0)) DIM_PERIOD_MV,
       D_CMP.DIM_KEY DIM_COMPANY,
       D_CUR.DIM_KEY DIM_CURRENCY,
       D_EL_1.DIM_KEY DIM_EL_1,
       D_EL_2.DIM_KEY DIM_EL_2,
       D_EL_3.DIM_KEY DIM_EL_3,
       D_EL_4.DIM_KEY DIM_EL_4,
       GRP_1_P_EL.DIM_KEY DIM_GRP_1_P_EL,
       D_GRP_1_B_EL.DIM_KEY DIM_GRP_1_B_EL,
       D_GRP_1_K_EL.DIM_KEY DIM_GRP_1_K_EL,
       D_GRP_2_D_EL.DIM_KEY DIM_GRP_2_D_EL,
       D_GRP_3_E_EL.DIM_KEY D_GRP_3_E_EL,
       B.ROWID X_OB_ROWID,
       D_CMP.ROWID X_CMP_ROWID,
       D_CUR.ROWID X_CUR_ROWID,
       D_EL_1.ROWID X_EL_1_ROWID,
       D_EL_2.ROWID X_EL_2_ROWID,
       D_EL_3.ROWID X_EL_3_ROWID,
       D_EL_4.ROWID X_EL_4_ROWID,
       GRP_1_P_EL.ROWID X_GRP_1_P_EL_ROWID,
       GRP_1_P.ROWID X_GRP_1_P_ROWID,
       D_GRP_1_B_EL.ROWID X_GRP_1_B_EL_ROWID,
       D_GRP_1_B.ROWID X_GRP_1_B_ROWID,
       D_GRP_1_K_EL.ROWID X_GRP_1_K_EL_ROWID,
       D_GRP_1_K.ROWID X_GRP_1_K_ROWID,
       D_GRP_2_D_EL.ROWID X_GRP_2_D_EL_ROWID,
       D_GRP_2_D.ROWID X_GRP_2_D_ROWID,
       D_GRP_3_E_EL.ROWID X_GRP_3_E_EL_ROWID,
       D_GRP_3_E.ROWID X_GRP_3_E_ROWID
FROM CLVE_STAGING.OAS_BALANCE_UNIONED B,
       FINANCE.DW_DIM_COMPANY D_CMP,
       FINANCE.DW_DIM_CURRENCY D_CUR,
       FINANCE.DW_DIM_EL_1 D_EL_1,
       FINANCE.DW_DIM_EL_2 D_EL_2,
       FINANCE.DW_DIM_EL_3 D_EL_3,
       FINANCE.DW_DIM_EL_4 D_EL_4,
       FINANCE.DW_DIM_GRP_1_P_EL GRP_1_P_EL,
       FINANCE.DW_DIM_GRP_1_P GRP_1_P,
       FINANCE.DW_DIM_GRP_1_B_EL D_GRP_1_B_EL,
       FINANCE.DW_DIM_GRP_1_B D_GRP_1_B,
       FINANCE.DW_DIM_GRP_1_K_EL D_GRP_1_K_EL,
       FINANCE.DW_DIM_GRP_1_K D_GRP_1_K,
       FINANCE.DW_DIM_GRP_2_D_EL D_GRP_2_D_EL,
       FINANCE.DW_DIM_GRP_2_D D_GRP_2_D,
       FINANCE.DW_DIM_GRP_3_E_EL D_GRP_3_E_EL,
       FINANCE.DW_DIM_GRP_3_E D_GRP_3_E
WHERE     B.CMPCODE = D_CMP.CODE
       AND (B.CMPCODE = D_CUR.CMPCODE(+) AND B.CURCODE = D_CUR.CODE(+))
       AND (B.CMPCODE = D_EL_1.CMPCODE(+) AND B.EL1 = D_EL_1.EL_CODE(+))
       AND (B.CMPCODE = D_EL_2.CMPCODE(+) AND B.EL2 = D_EL_2.EL_CODE(+))
       AND (B.CMPCODE = D_EL_3.CMPCODE(+) AND B.EL3 = D_EL_3.EL_CODE(+))
       AND (B.CMPCODE = D_EL_4.CMPCODE(+) AND B.EL3 = D_EL_4.EL_CODE(+))
       AND (GRP_1_P_EL.CMPCODE = GRP_1_P.CMPCODE(+)
            AND GRP_1_P_EL.GRP_CODE = GRP_1_P.GRP_CODE(+))
       AND (B.CMPCODE = GRP_1_P_EL.CMPCODE(+)
            AND B.EL1 = GRP_1_P_EL.EL_CODE(+))
       AND (D_GRP_1_B_EL.CMPCODE = D_GRP_1_B.CMPCODE(+)
            AND D_GRP_1_B_EL.GRP_CODE = D_GRP_1_B.GRP_CODE(+))
       AND (B.CMPCODE = D_GRP_1_B_EL.CMPCODE(+)
            AND B.EL1 = D_GRP_1_B_EL.EL_CODE(+))
       AND (D_GRP_1_K_EL.CMPCODE = D_GRP_1_K.CMPCODE(+)
            AND D_GRP_1_K_EL.GRP_CODE = D_GRP_1_K.GRP_CODE(+))
       AND (B.CMPCODE = D_GRP_1_K_EL.CMPCODE(+)
            AND B.EL1 = D_GRP_1_K_EL.EL_CODE(+))
       AND (D_GRP_2_D_EL.CMPCODE = D_GRP_2_D.CMPCODE(+)
            AND D_GRP_2_D_EL.GRP_CODE = D_GRP_2_D.GRP_CODE(+))
       AND (B.CMPCODE = D_GRP_2_D_EL.CMPCODE(+)
            AND B.EL2 = D_GRP_2_D_EL.EL_CODE(+))
       AND (D_GRP_3_E_EL.CMPCODE = D_GRP_3_E.CMPCODE(+)
            AND D_GRP_3_E_EL.GRP_CODE = D_GRP_3_E.GRP_CODE(+))
       AND (B.CMPCODE = D_GRP_3_E_EL.CMPCODE(+)
            AND B.EL3 = D_GRP_3_E_EL.EL_CODE(+));
CREATE INDEX FINANCE.DW_FACT_BAL_MV_INX
ON FACT_BAL_MV (X_OB_ROWID);
SQL> select count(X_OB_ROWID) from FACT_BAL_MV ;
COUNT(X_OB_ROWID)
         11444816
Elapsed: 00:00:27.85
SQL> select bytes/1024/1024/1024 GB from
user_segments where segment_name='FACT_BAL_MV';
        GB
4.4296875search id: redcorolla

Hard to say why the refresh is now slow. Possibilties include
* system resources implemented by the fast refresh
* something changed on the query making the background query run slowly
Look at the query first. 18 tables, with almost every join an outer join. Some of the tables appear more than once in the query.
Get an executioion plan to see how the query is being executed.

Use CONTEXT index on mview or use mview's rewrite directly

Please let me explain what I mean in Subject. I have 9 tables. Each of these tables has about 40,000 rows and one table has 2 million rows. Using first approach, I can build a join-only materialized view on top of nine table's mview log. then query on these nine tables directly. Advantage for doing that is use rewrite.

for second approach, I build a CONETXT index on several columns on the mview, and then query through CONTEXT index on mview directly. This is pretty much like Barbara did on CREATE INDEX book_idx ON book_search
[http]Indexing multiple columns of multiple tables using CTXCAT
but she used CTXCAT instead of CONTEXT index.

My question is will second approach better than first one and why. Unlike basic join several tables which gives you predictable performance, I often feel that CONTEXT index performance is unpredictable when tables have more than several thousands rows (maybe I did something wrong, but still looking for document regarding performance) .

I will appreciate someone could show hints on the issue.

Message was edited by:
qwe15933
Message was edited by:
qwe15933
Message was edited by:
qwe15933
Message was edited by:
qwe15933

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Image Capture and Preview "folder not writable" error importing to shared folder

I'm running 10.8.5 on a Late 2012 model Mac Mini. I'm trying to create a folder under my home directory where my wife can import pictures using Image Capture or Preview while logged into her account. I've tried setting permissions on the folder by setting POSIX permissions and ACLs from the command line, and also by setting ACLs using Get Info in Finder, but it seems as though both Image Capture and Preview ignore the ACLs and instead rely solely on the POSIX permissions for everyone/other (even when a relevant group is set). Unless the POSIX permissions for everyone/other are "rwx" Image Capture and Preview both give an error that the import failed, and /var/log/system.log shows errors that the "folder is not writable". I'd like to be able to set this up without making the folder and the files in it writable by everyone. My understanding was that ACLs should take precedence over POSIX permissions, but even the POSIX permissions don't seem to be getting handled properly, because the group is ignored. Any help or explanation of what's happening would be appreciated.
Here's an example with details:
Suppose we have the users alice and bob. We want to set permissions on the directory /Users/bob/importdir such that Alice can import files from a camera there using Image Capture (or Preview, either would do), but don't want to relax the permissions more than necessary.
We create a group named bob_and_alice
We set the following permissions on /Users/bob:
POSIX: rwxr-xr-x, owner=bob, group=staff (i.e. default POSIX permissions)
ACLs:
0: group:everyone deny delete
1: group:bob_and_alice allow list,search,readattr,readextattr,readsecurity
2: user:alice allow list,search,readattr,readextattr,readsecurity
"Get Info" shows "Read & Write" for bob and "Read Only" for alice, bob_and_alice, staff, and everyone
We set the following permissions on /Users/bob/importdir:
POSIX: rwxrwxr-x owner=bob, group=bob_and_alice
ACLS: (these are already probably more permissive than should be necessary)
0: group:bob_and_alice allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,re adextattr,writeextattr,readsecurity,writesecurity,file_inherit,directory_inherit
1: user:alice allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,re adextattr,writeextattr,readsecurity,writesecurity,file_inherit,directory_inherit
"Get Info" shows "Custom" for both alice and bob_and_alice, "Read & Write" for bob, and "Read Only" for everyone
Alice opens a Terminal and cd's to /Users/bob/importdir. Alice can create and delete files in this directory.
Now Alice opens Image Capture and with our camera connected we try to import a photo to /Users/bob/importdir. Image Capture shows an error dialog with the text "Import error. An error occurred while importing. The item 'foo.jpg' was not imported." /var/log/system.log shows the message: "Jul 20 22:12:34 computer_name.local Image Capture[32804]: Document destination folder is not writable" If instead Alice uses Preview it shows an error dialog with the text "The selected folder is not writable" and /var/log/system.log shows two error messages:
Jul 20 22:23:45 computer_name.local Preview[33280]: Document destination folder is not writable
Jul 20 22:23:45 computer_name.local Preview[33280]: Encountered error during image import: Error Domain=com.apple.ImageCaptureCore Code=-9934 "The selected folder is not writable" UserInfo=0x7ffda4881f00 {NSLocalizedDescription=The selected folder is not writable}
Now we change the POSIX permissions on /Users/bob/importdir to: rwxrwxrwx
The import succeeds with both Image Capture and Preview
Can anyone explain what's going on here? Is there another reasonable way to do this without, moving this shared directory to /Users/shared?

Did you figure out how to fix this?

Fast Refresh mview performance

Hi,
I'm actually facing with Fast Refresh Mview performace problems and i would like to know what is the possible improvments for the fast refresh procedure:
- base table is 1 500 000 000 rows partitions by day , subparttion by has (4)
- mlog partition by hash (4) with indexes on pk and snaptime
- mview partition by day subpartition by hash (4)
10 000 000 insertions / day in base table/mlog
What improvment or indexes can i add to improve fast refresh ?
Thanks for help

Hi,
Which DB version are you using?
Did you have a look at the MV refresh via Partition Change Tracking (PCT)?
http://download.oracle.com/docs/cd/B19306_01/server.102/b14223/advmv.htm#sthref575
If it's possible to use PCT, it would probably improve a lot the performance of the refresh of your MV.
Regards
Maurice

Mview Fast Refresh Problem

Hello,
We run a fast refresh for a particular mview. I have the mview log created on the primary db (base table) and the mview created on another reporting database.
The fast refresh seems to be fine throughout the day but at the end of a day it fails to do the fast refresh and i'm forced to do a complete refresh everyday which fixes it but this cycle continues until the end of day when it breaks again.
If you notice in the next date column the refresh date turns to 01-JAN-00, not sure why this happens and this is causing the problem.
JOB REFRESH_JOB LAST_DATE NEXT_DATE NEXT_SEC BROKEN
70 CON_SYS"."MV_BRICKNW" 04-AUG-10 01-JAN-00 00:00:00 Y
75 CON_SYS"."MV_BRICKNWCAN" 04-AUG-10 01-JAN-00 00:00:00 Y
Could someone please tell me what the problem is.

The Refresh Date gets reset when the job is Broken (which you see as BROKEN='Y'). The job is Broken when 16 consecutive attempts have failed (which you would see in FAILURE_COUNT).
You have to find out why it fails -- fails 16 times. There seems to be an issue with the date/time logic OR one of the source objects probably gets dropped or becomes unavailable close to the end of the day.
Hemant K Chitale

Mview fast refresh taking longer than complete refresh

Hi there,
We have a mview which takes about an hour to refresh in complete mode. Created all the mview logs and refreshing via fast method but this takes longer.
When all the mview logs empty works fine as fast refresh and far far quicker as would expect. Tried upadting one of records on base table called todays_date which simply stores todays date to get around fast refresh restriction with sysdate.
Anybody any idea why so slow?
Also wondering if better approach. Thought about just having an aggregate table and processing the inserts in MLOG$_TRANS_TABLE via a merge statement. Also heard about change data capture.
Any thoughts/suggestions welcome.
Many Thanks

Well, search with your post subject on this forum. There are a lot of threads discussing the same.

MVIEW refresh takes long time

Materialized view takes long time to refresh but when i tried select & insert into table it's very fast.
i executed SQL and it takes ust 1min ( total rows is 447 )
but while i refresh the MVIEW it takes 1.5 hrs ( total rows is 447 )
MVIEW configration :-
CREATE MATERIALIZED VIEW EVAL.EVALSEARCH_PRV_LWC
TABLESPACE EVAL_T_S_01
NOCACHE
NOLOGGING
NOCOMPRESS
NOPARALLEL
BUILD DEFERRED
REFRESH FORCE ON DEMAND
WITH PRIMARY KEY
Not sure why so much diffrence

infant_raj wrote:
Materialized view takes long time to refresh but when i tried select & insert into table it's very fast.
i executed SQL and it takes ust 1min ( total rows is 447 )
but while i refresh the MVIEW it takes 1.5 hrs ( total rows is 447 )A SELECT does a consistent read.
A MV refresh does that and also writes database data.
These are not the same thing and cannot be directly compared.
So instead of pointing at the SELECT execution time and asking why the MV refresh is not as fast, look instead WHAT the refresh is doing and HOW it is doing that.
Is the execution plan sane? What events are the top ones for the MV refresh? What are the wait states that contributes most to the processing time of the refresh?
You cannot use the SELECT statement's execution time as a direct comparison metric. The work done by the refresh is more than the work done by the SELECT. You need to determine exactly what work is done by the refresh and whether that work is done in a reasonable time, and how other sessions are impacting the refresh (it could very well be blocked by another session).

Fast Refreshable MVIEW

Trying to create a fast refresh materialized view based on a simple join of two tables over a database link oracle gives a 'COMPLEX QUERY' error (ORA-12015).
Logging on the origin tables should be ok as creating the MVIEW based on the same select but in the database where the origin tables are poses no problem. The logging tables are created based on primary key and include rowid.
The select on which the MVIEW should be created is someting like:
select
tab1.rowidn id1,
tab2.rowidn id2,
tab1.key_idn key1,
tab2.key_idn key2
from table1@other_db tabl,table2@other_db tab2
where tab1.key_idn = tab2.key_idn)
Does this mean it is impossible to create a fast refresh materialized view over a database link when a join condition is involved?

Replace the ANSI Joins with Conventional Joins.
Change this :
SELECT * FROM V_FIRST VF
LEFT JOIN R4
ON VF.ID=R4.ID
LEFT JOIN R5
ON VF.ID=R5.IDto this :
SELECT VF.* FROM V_FIRST VF, R4, R5
WHERE VF.ID=R4.ID
AND VF.ID=R5.IDHemant K Chitale

Mview's taking a looong time to refresh. Any ideas?

I have the following mview below. We are running the refresh using the FORCE option nightly. There are times when the refresh takes hours and we have to kill the job. Then, we just do a drop/recreate of the mview and it completes in < 20 minutes. Anyone have any ideas as to why?
The merchant table has about 800k rows.
The merchant_transaction table has about 18 million rows.
I have included the explain plan of this query below.
CREATE MATERIALIZED VIEW CARS.MER_MERTXN_MV
TABLESPACE MVIEW_TB
NOCACHE
LOGGING
NOCOMPRESS
NOPARALLEL
BUILD IMMEDIATE
REFRESH FORCE
NEXT NULL
WITH PRIMARY KEY
AS
SELECT mt.merchant_num,
mt.transaction_ref,
mt.transaction_type,
mt.transaction_status_code,
mt.transaction_date,
mt.sale_date,
NVL(mt.transaction_credit_amt,0),
NVL(mt.transaction_debit_amt,0),
NVL(mt.open_credit_amt,0),
NVL(mt.open_debit_amt,0),
NVL(mt.reserve_bal,0),
NVL(mt.collection_bal,0),
NVL(mt.acct_bal,0),
m.coll_assigned,
m.acct_location_code,
m.acct_type_code,
m.marker_bank_code,
m.cost_center_code,
m.portfolio_code,
m.rowid,
mt.rowid
FROM merchant_transactions mt, merchant m
WHERE mt.merchant_num = m.merchant_num;
EXPLAIN PLAN
Operation Object Name Rows Bytes Cost Object Node In/Out PStart PStop
SELECT STATEMENT Optimizer Mode=ALL_ROWS 18 M 212259
HASH JOIN 18 M 2G 212259
TABLE ACCESS FULL CARS.MERCHANT 791 K 40 M 9206
TABLE ACCESS FULL CARS.MERCHANT_TRANSACTIONS 18 M 1G 96231

1. Yes, but they aren't being used as per explain plan. I added a hint which helped. The problem is when we do a complete refresh. The fast refresh works fine. However, we have times when there is so much data added, it decides to do a complete. We are running FORCE. Does it DELETE the data or TRUNCATE the data when it does a complete? It seems its doing a DELETE.
2. no rows
3. 10.1. No parallelism being used.

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