4
votes
2answers
114 views

Clustered Table Scan Because of “SELECT *”

I have a Records table with over 100 columns and very many rows, and a nonclustered index on 5 fields based on my access paths: CREATE NONCLUSTERED INDEX [IX_Records_CustomerID] ON [dbo].[Records] ( ...
2
votes
2answers
65 views

best possible index on this situation

create table #testing(id int, name varchar(50)) go Insert Into #testing Values(231, 'fasd') Insert Into #testing Values(232, 'dsffd') Insert Into #testing Values(233, 'xas') Insert Into #testing ...
2
votes
3answers
666 views

Meaning of “nonclustered located on primary”

When I run sp_help (using ALT+F1) for a table, on the indexes, there is a column index_description. and the rows have for example: nonclustered located on PRIMARY (on foreign keys) nonclustered, ...
4
votes
2answers
211 views

If I update a column record in a table, will indexes that do NOT have this column in it be affected?

In terms of performance if I have a table like so: CREATE TABLE [TESTDATA].[TableA]( [Col1] [nchar](5) NOT NULL, [Col2] [nchar](2) NULL, [Col3] [float] NULL CONSTRAINT [TableA_PK] PRIMARY ...
1
vote
2answers
254 views

Clustered vs Nonclustered Index

My database currently has a primary Key/Clustered index on the ID column for each table. However, the application that connects to the database is always looking at views defined as: SELECT * FROM ...
1
vote
3answers
256 views

When to create Indexes?

I have a stored procedure that takes around 2 minutes to execute. The execution plan suggested me to create a non clustered index on a table (which is a high traffic table with millions of records in ...
2
votes
1answer
370 views

Non-clustered Index Update not displayed in execution plan [duplicate]

Possible Duplicate: Nonclustered Index Insert I'm trying to work out the cost of having a nonclustered index on a particular table, but I don't see any maintenance cost in the execution ...
0
votes
1answer
3k views

fundamental difference between Primary/Clustered and Secondary/Non-Clustered index

Are Primary Index and Clustered Index similar in concept Secondary Index and Non-Clustered Index similar in concept
2
votes
1answer
159 views

Aren't two writes required to update a clustered index record

I was reading the article on indexes at simple-talk, where it is written that If a heap has a non-clustered index on it (as the primary key), and data is inserted into the table, two writes have ...
4
votes
1answer
456 views

How are indexes represented in an ERD?

What do indexes look like in an Entity Relationship Diagram? I've googled it and I'm unsure what the standard look of an index is in an ERD. And I'm talking about the crowsfoot diagram that includes ...