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1answer
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Create Index with a WHERE clause

I've read the documentation on the MSDN, but it doesn't answer what I'm after. If I create an index on specified columns using a WHERE clause for certain IDs, this will limit the index to those IDs ...
2
votes
2answers
83 views

Best index for this scenario

There is a table in our database tblCustomText( ParentID int NOT NULL, CustomFieldID int NOT NULL, Value char(50) NOT NULL, Log_CreateDate datetime NOT NULL ) (ParentID+CustomFieldID) is ...
10
votes
2answers
5k views

Is there a way to force an index to stay in memory with SQL Server 2008?

I've got a table with several millions rows, from which I need to run some queries from time to time. First query will usually be quite slow (around 10s), and subsequent queries are usually way faster ...
4
votes
1answer
151 views

Filtered indices: Why include the filtered-on field?

This just drives me mad. Consider a simple table with irrelevant columns removed: create table boxes ( row_id int not null identity(1,1) primary key, location varchar(15) null, dismantled bit ...
3
votes
1answer
345 views

SQL Server: Duplicate Index Question

We recently has a massive performance problem on our system, which we narrowed down to a problem with I/O on the LUN. IOPS increased twenty-fold during the period when the problem was occuring. The ...
22
votes
3answers
11k views

Painless way to create a clustered index on a huge table?

So we have a customer site that is complaining about some seriously slow performance. I took one look and it's obvious that the problem is because Somebody Else (grrrr) designed a table holding some ...
2
votes
1answer
389 views

What's a good indexing scheme for a type-2 SCD table with a very broad natural key?

I have a table which links several fairly long text fields (~100 chars) to a single text field: { A, B, C, D } => E. The dependent value can change, so I query data daily and record A, B, C, D, ...
3
votes
1answer
639 views

Online Re-Indexing In SQL Server 2005/2008 Standard

The Story: Once a week, we run a special Maintenance Plan that involves re-indexing 2 critical tables that have ~6 Million records between the two of them. We use SQL Server 2005 Standard Edition. ...
7
votes
4answers
23k views

When to add indexes to #temp tables?

When testing stored procedures in SSMS, it sometimes says there is a missing index on #someTempTable____________________000000000000005B] (someField) etc etc When I do add them like this to the sp: ...
21
votes
3answers
4k views

Is it OK to blindly add missing indexes?

I often use SSMS to test my slow stored procedures for missing indexes. Whenever I see a "Missing Index (Impact xxx)" my kneejerk reaction is to just create the new index. This results in a faster ...
0
votes
1answer
439 views

FTS - Index rebuild causing CPU issues (SQL Server 2008 R2)

I am encountering some critical issues on SQL Server 2008 in a production environment; We have a database that contains a FTS index; we also have a maintenance job that rebuilds the FTS index and ...
4
votes
1answer
3k views

How are bit fields sorted for an index?

I am building a compound index, and I'm not 100% sure which way to include a bit field that is part of the table. The index will be for something similar to a list of forum topics, where I want the ...
6
votes
1answer
218 views

Composite or Single-Field Clustering Key

My DBA and I are having a disagreement on index structure. Consider data for a medical claim... We have the Header table with fields like: ClaimId (varchar(50)), PaidAmount, MemberID... and for ...
2
votes
3answers
2k views

Column sort order in CREATE INDEX statement?

When creating an index one can determine if an index column is sorted using ascending or descending order. BOL says that [ ASC | DESC ] Determines the ascending or descending sort direction for the ...
2
votes
2answers
419 views

How do redundant indexes impact query performance?

The indexes are affecting the ADD/UPDATE operations however I was wondering whether the redundant indexes will affect the SELECT query performance or not? How the redundant indexes are handled by ...
1
vote
1answer
1k views

Does composite cluster index affect performance of seek/scan non-cluster index which is part of the composite?

I have bank transaction table with columns Division Brcode TrDate ProjectCode Accountnumber EffectiveDate DrCr Amount EndBalance In the other table the Brcode itself is unique and is assigned under ...
2
votes
2answers
429 views

Indexing of Data Warehouse tables?

Maybe I have misunderstood something but I can recall reading an article which said that there is no reason to create non-clustered indexes on very large data warehousing tables? That is because ...
41
votes
3answers
47k views

Why is my database still fragmented after I rebuilt and reindexed everything?

I have a database which I tried to defragment all the tables at once by running this T-SQL: SELECT 'ALTER INDEX all ON ' + name + ' REORGANIZE;' + CHAR(10) + 'ALTER INDEX all ON ' + ...
3
votes
1answer
222 views

Minimum rowcount for filtered index?

Creating an index always has trade-offs. Whenever you insert, update or delete, it has to perform those operations on the index as well. This is all pretty commonly known. But with the advent of ...
5
votes
1answer
66 views

SQL Server 2008 Index

What would be the best index(es) to add to the tables in order to make this query as fast as possible. The sd.incidents tables is about 2.5M records, problems about 8K, and changes about 120K. select ...
3
votes
2answers
539 views

Search on part of a column in a SQL Server cross-database view

I'm currently writing an application that interfaces with a 3rd party vendor's SQL Server 2008 database that I only have read access to. We have a separate database that contains cross database views ...
38
votes
4answers
42k views

Hard and Fast rule for include columns in index

Is there any hard and fast rule to decide what columns and in which order it should be put in Included in non clustered index. I was just reading this post https://stackoverflow.com/questions/1307990/...
7
votes
1answer
13k views

How do I alter index rebuild an entire database?

I want to reorganize the indexes of all tables in my SQL Server 2008 database, named 'db'. I try the following command: ALTER INDEX all ON db REBUILD And I get the following error: Cannot find the ...
5
votes
1answer
945 views

Which fillfactor is used by ALTER INDEX REBUILD?

From technet I got the impression, that I either have to explicitly set the wanted fillfactor or when I do not specify it, the default fillfactor 0 is choosen. For tables I know to get rows added ...
6
votes
4answers
441 views

SELECT * WHERE VarCharColumn IN (…) Optimization

I have a list of 3000 strings, and I am passing them (twenty at a time) into a parametrized IN clause. It definitely isn't getting the results I would like to see ~ 500ms per execution. The column is ...
6
votes
1answer
510 views

Can filtered indexes help improve queries that are based on a time entered or should this be avoided?

I'm just learning about the new filtered indexes in MS SQL 2008 and I'm trying to understand where they would hurt and where they would help. I can see that adding a filtered index to an employees ...
9
votes
2answers
1k views

How much “Padding” do I put on my indexes?

How do you know how much "Padding" an index should have?