Snapshot refresh time

Hi
I have the following snapshot on oracle 8.1 :
CREATE SNAPSHOT LSBAN30Y_SNP
PCTFREE 0
PCTUSED 99
INITRANS 2
MAXTRANS 255
STORAGE (
INITIAL 256000 K
NEXT 25600 K
MINEXTENTS 1
MAXEXTENTS 505
PCTINCREASE 0
FREELISTS 1
FREELIST GROUPS 1
BUFFER_POOL DEFAULT)
TABLESPACE BP_DATA
LOGGING
NOCACHE
NOPARALLEL
USING INDEX PCTFREE 10
INITRANS 2
MAXTRANS 255
STORAGE (
BUFFER_POOL DEFAULT)
REFRESH COMPLETE
NEXT greatest(trunc(sysdate+1), NEXT_DAY(trunc(sysdate)-5 ,'MONDAY')) + 4/24 + 30/1440
WITH ROWID
USING DEFAULT LOCAL ROLLBACK SEGMENT
DISABLE QUERY REWRITE AS
SELECT
ACCT_ID BILLING_ACCOUNT_ID,
CUST_ID BLG_SYS_CUST_ID,
ACCT_ESTAB_DAT SYS_ACCT_ESTAB_DAT,
ACCT_STAT_CD SYS_ACCT_STS_CD ,
decode(SCE_SYS_ID, '1', 'C', '2', 'C', '3', 'C', '4', 'W', '5', 'W', '6', 'E', '7', 'E', null) LEG_SYS_RGN_INDR,
BTN BLG_ACCT_TLPHN_NO ,
BTN_CUST_CD,
BTN_SFX EASTERN_SUFFIX,
TYP_OF_ACCT_CD BTN_TYP_OF_ACCT_CD,
PRI_CLSS_ID CLSS_OF_SRVC_CD,
' ' BTN_CONTRACT_NO,
RTRIM(BLG_NM_LN1)||' ' ||LTRIM(BLG_NM_LN2) BTN_BILLING_NAME,
PCL_IND PCL_INDR,
BILL_PER SYS_BILL_PRD_INDR,
GR_ACCT_ID SYS_SPCL_BLG_GR_NO
FROM
CSBAN10V@UCDWP001
where ACCT_MKT_UN_ID in ('C', 'D', 'F', 'G', 'I', 'L', 'O', 'P',
'R', 'S', 'V', 'W')
and rownum < 5000000
I have created indexes on BILLING_ACCOUNT_ID and BLG_SYS_CUST_ID.
There are 4.3 million records in the snapshot.
It takes 6hrs to refresh the snapshot.
The questions I have are:
1. How can I reduce the refresh time? Is it because of the indexes? Should i make any change to the create snapshot script?
2. The create snaphot query works fine without the rownum < 500000 statement in oracle 9i but in oracle 8i it gives
CSBAN10V user not found in UCDWP001 error. It works OK with the rownum < 5000000 statement. Why is that so?
thanks
prash

You are specifying that the refresh must be COMPLETE, so Oracle has to transfer all 5,000,000 rows over the wire from the remote database every time. If you specified that the refresh could be FAST, and created a materialized view log on the remote table, Oracle would be able to transfer only the changed rows each time you refreshed.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

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Snapshot Refresh taking More Time

Dear All,
We are facing a Snapshot refresh problem currently in Production Environment.
Oracle Version : Oracle8i Enterprise Edition Release 8.1.6.1.0
Currently we have created a Snapshot on a Join with 2 remote tables using Synonyms.
ex:
CREATE SNAPSHOT XYZ REFRESH COMPLETE WITH ROWID
AS
SELECT a.* FROM SYN1 a, SYN2 b
Where b.ACCT_NO=a.ACCT_NO;
We have created a Index on the above Snapshot XYZ.
Create index XYZ_IDX1 on XYZ (ACCT_NO);
a. The Explain plan of the above query shows the Index Scan on SYN1.
If we query above Select Statement,it hardly takes 2 seconds to exedute.
b. But the Complete Refresh of Snapshot XYZ is almost taking 20 Mins for just truncating and inserting 500 records and is generating huge Disk Reads as SYN1 in remote table consists of 32 Million records whereas SYN2 contains only 500 Records.
If we truncate and insert inot a table as performed by the Complete refresh of Snapshot,it hardly takes 4 Seconds to refresh the table.
Please let me know what might be the possible reasons for the Complete refresh of Snapshot taking more time.

Dear All,
While refreshing the Snapshot XYZ,I could find the following.
a. Sort/Merge operation was performed while inserting the data into Snapshot.
INSERT /*+ APPEND */ INTO "XYZ"
SELECT a.* FROM SYN1 a, SYN2 b Where b.ACCT_NO=a.ACCT_NO;
The above operation performed huge disk reads.
b. By Changing the session parameter sort_area_size ,the time decreased by 50% but still the disk reads are huge.
I would like to know why Sort/Merge Operation is performed in the above Insert?
Edited by: Prashanth Deshmukh on Mar 13, 2009 10:54 AM
Edited by: Prashanth Deshmukh on Mar 13, 2009 10:55 AM

Snapshot refresh interval

Hi,
I would like to know how to create a snapshot refresh group that would refresh the snapshot daily between 0800 hrs to 1700 hrs.
Appreciate any inputs.
Thanks & Kind Regards,
Zaid

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When a job fails, the error should be written to the alert log.
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You can use the DBMS_JOB.BROKEN method to indicate that a job is no longer broken. You generally want to fix the underlying problem first, though.
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Snapshot Refresh (How to stop COMPLETE refresh and run FAST refresh)?

Hi,
I have a snapshot refresh executed as COMPLETE which is taking very long. When I try to kill this and try to run a FAST I get:
ERROR at line 1:
ORA-12057: materialized view "PORTALSNP1"."V21_BILLING_ACCOUNT" is INVALID an must complete refresh
How can I resolve this to stop the COMPLETE refresh altogether and be able to run the FAST refresh.
Also is there a way to get the time it will take to complete the running snapshot refresh?
Please and thankYou!
Regards,
A

You don't resolve it ... you drop the materialized view. Then you create a materialized view log. Then a properly coded MV.
http://www.morganslibrary.org/library.html
bookmark this link
then look up "Materialized Views and "Materialized View Logs"
The log must be created first.

Scheduling Snapshot refreshes

Hi
Need help here. The following is the script to create one of our snapshots.
CREATE SNAPSHOT PREEM_VIEW_SNP
PCTFREE 0
PCTUSED 99
INITRANS 2
MAXTRANS 255
STORAGE (
INITIAL 25600 K
NEXT 5120 K
MINEXTENTS 1
MAXEXTENTS 505
PCTINCREASE 0
FREELISTS 1
FREELIST GROUPS 1
BUFFER_POOL DEFAULT)
TABLESPACE BP_DATA
LOGGING
NOCACHE
NOPARALLEL
USING INDEX PCTFREE 10
INITRANS 2
MAXTRANS 255
STORAGE (
BUFFER_POOL DEFAULT)
REFRESH COMPLETE
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WITH ROWID
USING DEFAULT LOCAL ROLLBACK SEGMENT
DISABLE QUERY REWRITE AS
select cust_id customer_id,BTN || BTN_CUST_CD || RPAD(BTN_SORT_CD, 1) || RPAD(BTN_SFX, 4) || RPAD(BTN_ST_CD, 1)BLG_ACCT_TLPHN_NO
from CSBAN10V@UCDWP001
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Im concerned about the NEXT TRUNC(SYSDATE+1) + 6.5/24 part. It says the snapshot refreshes every day at 6:30 am.
I need to schedule the refreshes every day except Saturday and Sunday. Got any idea how can I do that?
Prash

You would probably want to use the dbms_job package to schedule the refresh in that case, rather than scheduling the refresh in the materialized view creation. Write a function that returns the next refresh time for your snapshot and pass that in when you create your job.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

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Snapshot Refresh

Hi.,
I am facing following error on during the snapshot refresh at 8i
ORA-04052: error occurred when looking up remote object [email protected]
ORA-00604: error occurred at recursive SQL level 2
ORA-02085: database link RT.PRDU connects to RT
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Message was edited by:
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ORA-12008: error in snapshot refresh path

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Message was edited by:
thrilller

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Hi All,
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Problem is ....
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On 3/5/2014 1:56 PM, dschaldenovell wrote:
>
> Good day,
>
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> 0 days 2 hours 0 minutes
>
> Previously this was unchecked and the values were grayed out but read 60
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>
> We are going to be asking the staff to test
>
>
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Novell Technical Support Engineer
Novell does not officially monitor these forums.
Suggestions/Opinions/Statements made by me are solely my own.
These thoughts may not be shared by either Novell or any rational human.

How to find total refresh time of Materialize view?

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Snapshot refresh time

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