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

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Is GUID(uniqueidentifier) not suitable for a clustered index? [on hold]

When i use uniqueidentifier datatype for primary key column then it will automatically create clustered index... So, will it slow down my queries or not ? I am explaining some description of my ...
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Is it good to create new indexes for better performance - SQL Server [duplicate]

Hi I have a SQL Stored Proc that used to take 45 seconds to execute. Then I run the Execution Plan under SQL and saw some high cost steps: Then I right click that and select: And finally I ...
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Postgres cluster data on large rapidly changing table

I have a table in Postgres which will store statistical information on a range of metrics on a number of machines. Each record is fairly simple, with a date, machine ID, metric ID, and a value. Once ...
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Copy primary keys/clustered indexes from Prod to DEv/Test env

We followed the best practices of creating Primary Keys/Clustered indexes on tables which are actively queried on prod. Now there is a scenario where we need to get the similar above changes done ...
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155 views

Ordering of table is based on Clustered index or non clustered primary key?

I have created a table with primary key on name column, the ordering of the table is based on name column create table TestPrimaryKey (Name varchar(20) primary key,id int identity) insert into ...
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34 views

Can InnoDB use a clustered index as a covering index?

The scenario I have in mind is a query like: SELECT id FROM table WHERE id = ? or equivalently, SELECT 1 FROM table WHERE id = ? So here's some background: In a B+ tree (which InnoDB uses as ...
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50 views

Use of Non clustered Indexes

I know the differences between clustered and non-clustered indexes. Can someone tell me the various scenarios where we actually prefer non clustered index over a clustered index ?
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2k views

Storage order vs Result order

This is a spin-off question from Sort order specified in primary key, yet sorting is executed on SELECT. @Catcall says this on the subject of storage order (clustered index) and the output order ...
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1answer
259 views

Clustered index not used in a delete statement

I have a SQL Server table defined as follow CREATE TABLE [dbo].[Production_Detail] ( [Id] [bigint] NOT NULL DEFAULT (NEXT VALUE FOR [dbo].[Production_Detail_Seq]), [Meta_Data_ID] INT NOT NULL ...
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69 views

Clustered Index and PK - Two different Objects?

I have a table which has a Clustered PK as follows: CREATE TABLE [dbo].[PanelCcmRawData] ADD CONSTRAINT [PK_CcmRawData] PRIMARY KEY CLUSTERED ( [CcmRawDataId] ASC, [LineageId] ASC ) I ...
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Does Clustered Index on GUID create more fragmentation than Non Clustered Index?

I have a simple table: CREATE TABLE [dbo].[UserTestGroups]( [UserTestGroupId] [int] IDENTITY(1,1) NOT NULL, [Token] [nvarchar](100) NOT NULL, [TestId] [bigint] NOT NULL, [Group] [...
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Should I add an auto-increment / IDENTITY field to a cross-reference table just for PK purposes?

I'm adding the following cross-reference table to my SQL Server-hosted DB: company_id bigint not null (FK) org_path nvarchar (2048) not null The company_id field refers to the id field in another ...
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1answer
64 views

Should I remove this clustered index?

I have lots of tables designed similar as the following (slightly simplified) sample. The original table on different servers has between 50,000 and 200,000 rows (around 12,000 - 150,000 pages). ...
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466 views

Would a table benefit if it was a heap

I've a logging table with approx 1.500.000 rows, the primary key is an ascending identity and the clustered index is on the primary key. The identity value is auto-generated => records are always ...
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3answers
152 views

Why SQL Server uses Non-Clustered but not Clustered Index?

I have a table with 145 million rows CREATE TABLE [dbo].[RFTest]( [SnapshotKey] [int] NOT NULL, [SnapshotDt] [datetime] NOT NULL, [LoanNum] [int] NOT NULL, [GLSourceSystem] [varchar](...
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2answers
109 views

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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Varchar PrimaryKey. Clustered or nonclustered? [duplicate]

I am working on a legacy database. The primary key is clustered varchar(128) and the table contains a high volume of data. Does it necessarily help performance if I change the clustered PK to ...
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0answers
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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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87 views

Clustered Index Misunderstanding

I've read in couple of articles that clustered index is as the same as table, or if you read using clustered index, you have the whole record. Some say, clustered index stores the whole records in ...
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3answers
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What does having the primary key as the last column in a composite secondary index in an InnoDB table do?

Say I have a 1-to-N relationship (person_id, pet_id). I have a table where pet_id is the primary key. I understand that an InnoDB secondary index is essentially a B-tree where the values are the ...
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1answer
82 views

Online clustered index rebuild using more log space than expected

I have a table TableA ID PK BIGINT TrxID BIGINT CardBalance INT AccountBalance INT SP_SPACEUSED 'TableA' output: name rows reserved data index_size unused TableA 904054184 ...
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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 '', `foreign_id`...
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2answers
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How to create Clustered and non clustered index in Oracle?

I dug couple of hours regarding my question and didn't get satisfactory answer. Still I have doubt. I have found the following about Clustered Index: Data is stored in the order of the clustered ...
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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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1answer
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Why does SQL Server require non-clustered index to use unique keys?

According to Do clustered indexes have to be unique? The answer is yes. In the sense that SQL Server will make it unique by appending 4-bytes to key. This makes sense given that clustered index is ...
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SUM of DATALENGTHs not matching table size from sys.allocation_units

I was under the impression that if I were to sum the DATALENGTH() of all fields for all records in a table that I would get the total size of the table. Am I mistaken? SELECT SUM(DATALENGTH(Field1)) ...
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Splitting the table to get more clusterization options - will it help? [closed]

Complete theory. Let's assume we have a table with a few millions rows. The table has clustered index over PK, and it is important for quick fetching of particular rows. However, the table also has a ...
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1answer
2k views

What factors go into an Indexed View's Clustered Index being selected?

Breifly What factors go into they query optimizer's selection of an indexed view's index? For me, indexed views seem to defy what I understand about how the Optimizer picks indexes. I've seen this ...
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Why index REBUILD does not reduce index fragmentatation?

I have used ALTER INDEX REBUILD to remove index fragmentation. In some cases REBUILD does not seem to remove this fragmentation. What are the reasons why REBUILD does not remove fragmentation? It ...
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2answers
576 views

Why SQL Server has 900 byte index size limit

Why can't we create an index having size greater than 900 bytes? This question was raised in a presentation to which no one had an answer. I can think of this way to answer this question. Page size ...
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Wide clustered index vs multiple narrow nonclustered indexes?

Say I have a contrived Student table like so: CREATE TABLE Student ( Id IDENTITY INT, SchoolId INT NOT NULL, FirstName VARCHAR(20) NOT NULL, LastName VARCHAR(20) NOT NULL ) ...
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219 views

Datetime Clustered Index Keeps getting fragmented

I have a large table (4 million Records) named CDR, which is used for storing CDRs (Call Detail Record)s from a Cisco router in a VoIP system, the table is constantly growing and will never have a ...
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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 read-...
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Howto Identify Clustered Index Candidates

I find myself in a situation where I have inherited the db and people complain about database performance. I identified about a dozend of tables not having a clustered index or a not carefully planned ...
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2answers
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Does my table need a primary key and clustered index change?

I have a table holding 1.7 Milion rows. Definition: CREATE TABLE T( [ID] [uniqueidentifier] NOT NULL, [AID] [uniqueidentifier] NOT NULL, [BID] [uniqueidentifier] NOT NULL, [iType] [int] NOT NULL, [...
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1answer
895 views

Is a clustered index on column A the same as creating a table ordered by A?

Reading the official PostgreSQL documentation for version 9.0 I read an interesting escamotage that performs better than CLUSTER for big tables: The CLUSTER command reorders the original table by ...
2
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1answer
767 views

Change clustered index without dropping the primary key

In past, I have chosen date-time column created as inappropriate clustered index in the table. Now I guess (base on execution plan) that it would be better to choose ID identity primary key as ...
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1answer
393 views

MySQL/InnoDB - Clustering Index with UUID

In MS SQL Server it is possible to cluster an index on a non-primary, non-unique key. For example, if I wanted to create a clustered index on the insert date to prevent page splits and fragmentation ...
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1answer
82 views

Single Clustered Index Concept

Lets suppose we create a table called "SampleTable" and made "ID" column a primary key. SQL Server by default creates a clustered index on the table. This physically sorts the data on the disk. Now ...
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1answer
54 views

Can't eliminate index scan

I have a query, and even using SQL Sentry, I can't eliminate the index scan. This is the query: SELECT TOP 30 codCliente FROM ( SELECT t1.CodCliente, codcampo, valor, t1.chavealeat ...
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1answer
61 views

SQL server UPDATE statement is processing records that should be eliminated by WHERE clause

I am getting a very odd error. Consider the table below. CREATE TABLE #MyTable ( Key1 INT , Key2 INT , x SMALLINT , y INT , z INT , a FLOAT , b FLOAT , c SMALLINT , s FLOAT ) -- insert ...
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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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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] ...
7
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1answer
111 views

Clustered Index Help, where did i go wrong?

I was asked to review a very busy table and identify any areas of improvement. I have very limited power to change the table just the indexes. Table information 240 columns ~5 million rows Read ...
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1answer
650 views

Timestamp-based index

I have a big database (200GB+) that contains some log info. And I want to speed up SELECT queries and stored procedures. I have a table with a GeneratedOnUtc datetime column, and have a non-clustered ...
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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 ...
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Defrag a HEAP by creating clustered index and immediately dropping it

I'm writing a script which intends to defrag a HEAP based table by creating a dummy col with a clustered index and then immediately dropping it. (It's someone else's app and I don't want to make any ...
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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 ...
4
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1answer
215 views

Column Store Index over an clustered index (created when primary key is declared) - SQL Server

When a clustered index is created, the table itself becomes the index structure sorted by the index key. Imagine now that we have 5 columns in a table XPTO (a,b,c,d,e) and "a" is the primary key and ...
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81 views

Which columns (and order) to choose for a clustered index to maximize query performance

In our database we have a table that looks more or less like the example below. In the past we always created the clustered index on the ID column on the table. CREATE TABLE [Measurement] ( [ID] ...