1
vote
1answer
34 views

Choice of clustered key when almost all columns would be part of a unique index anyway

I am creating the following table CREATE TABLE dbo.COMM_SHELF_BLOCK_ACCESS ( KeyId uniqueidentifier NOT NULL ROWGUIDCOL CONSTRAINT DF_COMM_SHELF_BLOCK_ACCESS_KeyId default NEWSEQUENTIALID(), ...
2
votes
0answers
64 views

Can there be any case where it would require additional indexes while all columns compose primary key

Ok i don't know whether this question is asked before or not Here my table SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[tblProductPagesFeatures]( ...
0
votes
2answers
82 views

Which should I use on my DB? - Clustered Index or Non Clustered Index or Both

I just need advice on how I am going to optimize my database. Date ---- Time ---- Area ---- Block ---- Data1 ---- Data2 ---- Data3 ---- DataN I have that format of tables on my database. Each ...
1
vote
0answers
3k views

How to speed up query on table with millions of rows

The Issue: I'm working on a big table that consists about 37mln rows. Data include measurements of many devices made in certain time e.g. '2013-09-24 10:45:50'. Each day all of those devices are ...
3
votes
1answer
71 views

Locating row in index page

In clustered index, we have root, intermediate and leaf level pages. Every page has few records where indicating range of pages from level below. How SQL check whether some index key belong to ...
0
votes
1answer
123 views

clustered index - data warehouse

My source data comes from multiple OLTP databases where the primary key is an identitiy column. We anticipate adding data centers and/or splitting the databases by product. Currently i have one system ...
5
votes
2answers
881 views

Large Fact table and partitioning key dilemma

I have fairly large fact table (2 billion records, approx 120 GB). This table is not partitioned and the queries are very slow to respond. I am planning to partition the table and indexes. The table ...
4
votes
2answers
459 views

Does a cluster index provide more benefits than pre-sorting the load file and creating non-cluster index?

Informix 11.70.TC4DE: CREATE TABLE cluster_tbl ( fk_id INT, data CHAR(2048) ); LOAD FROM "presorted.ld" INSERT INTO cluster_tbl; CREATE UNIQUE CLUSTER INDEX cl_idx ON cluster_tbl(fk_id); ...
29
votes
3answers
1k views

Is the concept of a clustered index in a DB design sensical when using SSDs?

When designing a SQL server data schema and the subsequent queries, sprocs, views, etc. does the notion of a clustered index and order of data on disk make any sense to consider for DB designs made ...