A type of index mostly used in SQL-Server, which aligns the data of a table with the index.

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Maintain Up-To-Date Copy of Very Large Table if Clustering/Partitioning/Moving Operation Needs to be Killed/Rollback

I've appended the following information in a previous post but I asked the 'why' instead of the 'how'. So here's the question... SQL Server 2014, CU6. 4.5 TB database, Simple recovery. The most ...
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1answer
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Does PostgreSQL `CLUSTER` command also cluster extended storage?

I'm trying to improve the locality of my data by using the CLUSTER command to periodically cluster records that share the same user_id. My most important data is in extended storage. Will extended ...
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74 views

Clustered index on a join table

Currently I have a table defined as follows, but I'm not sure what to cluster the table on: CREATE TABLE [Security].[UserGroups] ( [UserId] INT NOT NULL, [GroupId] INT NOT NULL, [IsAdmin] ...
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621 views

SQL Server 2008 R2 clustered index issue

Last week, we came up with a strange issue on Clustered index. We are using SQL Server 2008 R2 in our organization. A stored procedure is written for our application which contains a cursor in it. ...
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0answers
46 views

Clustered index on a fact table

I'm trying to work out what field(s) to use for the clustered index of my fact tables (which all have a similar structure). I'll use FactSales as an example: CREATE TABLE dbo.FactSales ( ...
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0answers
71 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]( ...
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Why does removing a RID by creating a clustered index lose parallelism and slow down execution by 2X

If I remove a RID lookup by replacing 2 non-clustered indices (non unique) with 2 identical clustered indicies (non-unique) where there weren't any before, why does this query slow down by a factor ...
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30 views

Table clustered-index and partitioning in innoDB

I have a table with 45 columns, 3 of which are relevant: table Transactions(tr_id : int primary key, client : int, tr_date : datetime); The inserts to the table are done client-by-client The ...
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253 views

Dropping old and creating a new clustered index

I am wondering what is the best approach for dropping and creating a new clustered index on a table within SQL Server 2008. My primary concern is the length of time it will take to perform this ...
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88 views

How to optimize clustered index rebuild?

I need to rebuild the clustered index of the table that has more then 1.6 millions rows, more then 20 non-clustered indexes and 80 columns in order to reclaim space after two NVARCHAR(MAX) columns ...
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5k 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 ...
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19 views

MySQL TokuDB not using Index correctly by itself

the main table on my Database looks like this: CREATE TABLE IF NOT EXISTS `data_min` ( `pid` mediumint(8) unsigned NOT NULL, `action` char(65) COLLATE ascii_bin NOT NULL DEFAULT '', ...
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Composite Primary/Clustering Key vs GUID for Merge Replication scenario

I need to decide on a primary key for my tables in a merge replication scenario (currently one laptop taken into the field during the day while another user works on a desktop; both users need ...
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0answers
36 views

How to improve the slow performance with Insert operations in SQL Server 2005?

Suddenly our server started to have a bad performance, after trace the error, I identified that the inserts are the problem, this seems a know bug: https://support.microsoft.com/en-us/kb/940545 (The ...
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45 views

Refactoring 80 GB table that stores massive amount of calculated results

Trying to evaluate architectural changes to improve the performance of an app that calculates a lot of individual values and stores each of these results as a row. The storage size for one of the ...