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SQL Server 2005
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SQL Server 2005 Performance Tuning
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Materialized Views
Materialized Views
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U.T
U.T
Posted Wednesday, July 30, 2008 12:31 PM
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Last Login: Thursday, February 21, 2013 4:35 PM
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One of my query is using 4-5 tables using Inner or Left Outer joins.
These tables are the main tables of the Db and contains alot of data. Also multiple user & multiple applications are inserting data in these tables as well. So will a materialized view by joining these 4-5 tables will give any performance benefit? Or it will be even more overhead?
Thanks,
Usman
Post #543805
GSquared
GSquared
Posted Wednesday, July 30, 2008 1:03 PM
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It depends.
If you have a lot of selects on certain conditions, then a materialized view based on those conditions can increase performance for those selects.
On the other hand, materialized views, like any index, do slow down insert/update/delete operations.
In many cases, the slight slow-down on those is worth the large speed-up on selects, but this requires doing some research and making sure the view is exactly what you need.
Used correctly, a materialized view can speed up lots of things. Used poorly, they can slow down lots of things.
- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
Property of The Thread
"Nobody knows the age of the human race, but everyone agrees it's old enough to know better." - Anon
Post #543842
Steve Jones - SSC Editor
Steve Jones - SSC Editor
Posted Wednesday, July 30, 2008 2:23 PM
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I tend to agree with the views expressed above. It can be a useful tool, if you consider the load on your system for Ins/Upd/Del
Follow me on Twitter:
@way0utwest
Forum Etiquette: How to post data/code on a forum to get the best help
Post #543903
Jeff Moden
Jeff Moden
Posted Wednesday, July 30, 2008 7:44 PM
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usman.tanveer (7/30/2008)
One of my query is using 4-5 tables using Inner or Left Outer joins.
These tables are the main tables of the Db and contains alot of data. Also multiple user & multiple applications are inserting data in these tables as well. So will a materialized view by joining these 4-5 tables will give any performance benefit? Or it will be even more overhead?
Thanks,
Usman
I believe that a materialized view will cause you a world of hurt
in this particular case
because of all the inserts you say you'll be doing.
--Jeff Moden
"
RBAR
is pronounced "ree-bar" and is a "Modenism" for "
R
ow-
B
y-
A
gonizing-
R
ow".
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."
For better, quicker answers on T-SQL questions, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/
For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/
Post #544016
GSquared
GSquared
Posted Monday, August 04, 2008 7:56 AM
SSCoach
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Last Login: Yesterday @ 1:45 PM
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Visits: 9,572
Jeff Moden (7/30/2008)
usman.tanveer (7/30/2008)
One of my query is using 4-5 tables using Inner or Left Outer joins.
These tables are the main tables of the Db and contains alot of data. Also multiple user & multiple applications are inserting data in these tables as well. So will a materialized view by joining these 4-5 tables will give any performance benefit? Or it will be even more overhead?
Thanks,
Usman
I believe that a materialized view will cause you a world of hurt
in this particular case
because of all the inserts you say you'll be doing.
It depends. It will slow down the inserts, but if those are generally single-table, single-row inserts, the performance hit on that might be negligible. What isn't mentioned is what queries the view will be supporting.
Even with lots of inserts, you can still have a net gain if you have a lot of complex queries that are called frequently.
I've even had a net gain in insert speed in one case, because of an indexed view that was used by those inserts (Insert...Select). Slowed down the insert part, but gained even more from the select part. (Supported complex business rules in an upsert situation.) Went from 600 ms to 40 ms on a common transaction in that database.
- Gus "GSquared", RSVP, OODA, MAP, NMVP, FAQ, SAT, SQL, DNA, RNA, UOI, IOU, AM, PM, AD, BC, BCE, USA, UN, CF, ROFL, LOL, ETC
Property of The Thread
"Nobody knows the age of the human race, but everyone agrees it's old enough to know better." - Anon
Post #546102
Jeff Moden
Jeff Moden
Posted Monday, August 04, 2008 7:33 PM
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Last Login: Today @ 12:10 AM
Points: 33,108,
Visits: 27,030
Actually, Gus' answer is the best answer... "It depends". This is the kind of thing that you need to test.
Gus, good point about the net gain on things like Insert/Select. :)
--Jeff Moden
"
RBAR
is pronounced "ree-bar" and is a "Modenism" for "
R
ow-
B
y-
A
gonizing-
R
ow".
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column."
For better, quicker answers on T-SQL questions, click on the following...
http://www.sqlservercentral.com/articles/Best+Practices/61537/
For better answers on performance questions, click on the following...
http://www.sqlservercentral.com/articles/SQLServerCentral/66909/
Post #546458
Hossam AlFraih
Hossam AlFraih
Posted Tuesday, April 12, 2011 7:00 AM
Grasshopper
Group: General Forum Members
Last Login: Sunday, June 02, 2013 11:42 PM
Points: 12,
Visits: 76
Indexed Views will helps by pre-computing aggregations and store them in the index. Moreover, joining tables can be pre-join and results data can be stored.
This can speed up your queries by approx. 50-75% in general.
But remember, it always depends!
Good luck.
Post #1092039
Patibandla
Patibandla
Posted Tuesday, August 21, 2012 5:41 AM
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Group: General Forum Members
Last Login: Friday, June 07, 2013 8:41 AM
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Visits: 144
It is truly not suggestible to use an Indexed View when the tables are highly transactional as you mentioned. But if the priority is reporting then you can use the materialized views with NOLOCK on the Tables.
Post #1347724
Patibandla
Patibandla
Posted Tuesday, August 21, 2012 5:47 AM
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Last Login: Friday, June 07, 2013 8:41 AM
Points: 35,
Visits: 144
Rather you should keep in mind that you will not be allowed to do any properties that affect the deterministic nature of an indexed view like full-text predicates or references to other views aggregation operations etc..
Post #1347726
Lynn Pettis
Lynn Pettis
Posted Tuesday, August 21, 2012 8:16 AM
SSC-Insane
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Last Login: Yesterday @ 3:27 PM
Points: 21,832,
Visits: 27,845
I am going to join in with the "It depends" group. You need to test if a materialized view is going to help or not. There really is no definative answer here.
Test it, and let us know if it helped or hindered you in this situation.
Lynn Pettis
For better assistance in answering your questions, click here
For tips to get better help with Performance Problems, click here
For Running Totals and its variations, click here
or
when working with partitioned tables
For more about Tally Tables, click here
For more about Cross Tabs and Pivots, click here
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