Clustered Index Vs. Full Text Index
Jun 18, 2008
Quick question about the primary purpose of Full Text Index vs. Clustered Index.
The Full Text Index has the purpose of being accessible outside of the database so users can query the tables and columns it needs while being linked to other databases and tables within the SQL Server instance.
Is the Full Text Index similar to the global variable in programming where the scope lies outside of the tables and database itself?
I understand the clustered index is created for each table and most likely accessed within the user schema who have access to the database.
Is this correct?
I am kind of confused on why you would use full text index as opposed to clustered index.
Thank you
Goldmember
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Sep 30, 2015
I am using Full Text Index to index emails stored in BLOB column in a table. Index process parses stored emails, and, if there is one or more files attached to the email these documents get indexed too. In result when I'm querying the full text index for a word or phrase I am getting reference to the email containing the word of phrase if interest if the word was used in the email body OR if it was used in any document attached to the email.
How to distinguish in a Full Text query that the result came from an embedded document rather than from "main" document? Or if that's not possible how to disable indexing of embedded documents?
My goal is either to give a user an option if he or she wants to search emails (email bodies only) OR emails AND documents attached to them, or at least clearly indicate in the returned result the real source where the word or phrase has been found.
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Nov 14, 2006
the query:
SELECT a.AssetGuid, a.Name, a.LocationGuid
FROM Asset a WHERE a.AssociationGuid IN (
SELECT ada.DataAssociationGuid FROM AssociationDataAssociation ada
WHERE ada.AssociationGuid = '568B40AD-5133-4237-9F3C-F8EA9D472662')
takes 30-60 seconds to run on my machine, due to a clustered index scan on our an index on asset [about half a million rows]. For this particular association less than 50 rows are returned.
expanding the inner select into a list of guids the query runs instantly:
SELECT a.AssetGuid, a.Name, a.LocationGuid
FROM Asset a WHERE a.AssociationGuid IN (
'0F9C1654-9FAC-45FC-9997-5EBDAD21A4B4',
'52C616C0-C4C5-45F4-B691-7FA83462CA34',
'C95A6669-D6D1-460A-BC2F-C0F6756A234D')
It runs instantly because of doing a clustered index seek [on the same index as the previous query] instead of a scan. The index in question IX_Asset_AssociationGuid is a nonclustered index on Asset.AssociationGuid.
The tables involved:
Asset, represents an asset. Primary key is AssetGuid, there is an index/FK on Asset.AssociationGuid. The asset table has 28 columns or so...
Association, kind of like a place, associations exist in a tree where one association can contain any number of child associations. Each association has a ParentAssociationGuid pointing to its parent. Only leaf associations contain assets.
AssociationDataAssociation, a table consisting of two columns, AssociationGuid, DataAssociationGuid. This is a table used to quickly find leaf associations [DataAssociationGuid] beneath a particular association [AssociationGuid]. In the above case the inner select () returns 3 rows.
I'd include .sqlplan files or screenshots, but I don't see a way to attach them.
I understand I can specify to use the index manually [and this also runs instantly], but for such a simple query it is peculiar it is necesscary. This is the query with the index specified manually:
SELECT a.AssetGuid, a.Name, a.LocationGuid
FROM Asset a WITH (INDEX (IX_Asset_AssociationGuid)) WHERE
a.AssociationGuid IN (
SELECT ada.DataAssociationGuid FROM AssociationDataAssociation ada
WHERE ada.AssociationGuid = '568B40AD-5133-4237-9F3C-F8EA9D472662')
To repeat/clarify my question, why might this not be doing a clustered index seek with the first query?
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Nov 20, 1998
If I have a table that I want to create a clustered index on. For example sake, say that I have 2 columns in the table. Col1 is char(2), col2 is text (or image). If I create a clustered index on col1, the database needs 1.2% times the size of the table to create the clustered index. Does this include the size of col2, being that text and image data is stored in a separate page chain....?
thanks for your time!
Tim
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Dec 5, 2007
Dear All.
We had Teradata 4700 SMP. We have moved data from TD to MS_SQL SERVER 2003. records are 19.65 Millions.
table is >> Order_Dtl
Columns are:-
Client_ID varchar 10
Order_ID varchar 50
Order_Sub_ID decimal
.....
...
..
.
Pk is (ClientID+OrderId+OrderSubID)
Web Base application or PDA devices use to initiate the order from all over the country. The issue is this table is not Partioned but good HP with 30 GB RAM is installed. this is main table that receive 18,0000 hits or more. All brokers and users are using this table to see the status of their order.
The always search by OrderID, or ClientID or order_SubNo, or enter any two like (Client_ID+Order_Sub_ID) or any combination.
Query takes to much time when ever server receive more querys. some orther indexes are also created on the same table like (OrderDate, OrdCreate Date and Status)
My Question are:-
Q1. IF Person "A" query to DB on Client_ID, then what Index will use ? (If any one do Query on any two combination like Client_ID+Order_ID, So what index will be uesd.? How does MS-SQL SERVER deal with these kind of issues.?
Q2. If i create 3 more indexes on ClientID, ORderID and OrdersubID. will this improve the performance of query.if person "A" search record on orderNo so what index will be used. (Mind it their would be 3 seprate indexes for Each PK columns) and composite-Clustered index is also available.?
Q3. I want to check what indexes has been used? on what search?
Q4. How can i check what table was populated when, or last date of update (DML)?
My Limitation is i Dont Create a Partioned table. I dont have permission to do it.
In Teradata we had more than 4 tb record of CRM data with no issue. i am not new baby in db line but not expert in sql server 2003.
I am thank u to all who read or reply.
Arshad
Manager Database
Esoulconsultancy.com
(Teradata Master)
10g OCP
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Jul 3, 2006
Hi everyone,
When we create a clustered index firstly, and then is it advantageous to create another index which is nonclustered ??
In my opinion, yes it is. Because, since we use clustered index first, our rows are sorted and so while using nonclustered index on this data file, finding adress of the record on this sorted data is really easier than finding adress of the record on unsorted data, is not it ??
Thanks
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Mar 5, 2015
I have a clustered index that consists of 3 int columns in this order: DateKey, LocationKey, ItemKey (there are many other columns in this data warehouse table such as quantities, prices, etc.).
Now I want to add a non-clustered index on just one of the other columns, say LocationKey, like this:
CREATE INDEX IX_test on TableName (LocationKey)
I understand that the clustered index keys will also be added as key columns to any NC indexes. So, in this case the NC index will also get the other two columns from the clustered index added as key columns. But, in what order will they be added?
Will the resulting index keys on this new NC index effectively be:
LocationKey, DateKey, ItemKey
OR
LocationKey, ItemKey, DateKey
Do the clustering keys get added to a NC index in the same order as they are defined in the clustered index?
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Feb 15, 2007
hello
in Full Text Search
Are there method when add record in Field for properties "Full Text Index " , update catalogs ?
thanks
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Dec 4, 2007
I am trying to enable full text index on all of my databases but notices that it is grayed out. Also the service Full Text Index service msftesql.exe is not installed. I have tried running the install again but it says nothing has changed on the machine so it just stops the install... Hope someone can help me.
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Apr 10, 2006
What is a full-text index? Please be gentle. Sorry for not looking itup in the help or on the Web. Be kind.
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Oct 7, 2007
Could Full Index option only be configured during installation? When Itry sp_fulltext_table on a table, I get the message that full text isnot enabled for the system.--sharif
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Jul 26, 2007
I am having an issue creating full indexes on both instances of an ActiveActive SQL Server 2000 cluster. I get the following error when trying to create the catalog:
Access is denied to $SQL PATH$, or path is invalid. Full-text search was not installed properly.
Does anyone have any suggestions that I may use to create the indexes?
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Jan 16, 2006
First of all I’m new to MS SQL, I did work with mySQL
Table name db (real db has 12 columns)
Id c1 c2 c3
1 tom john olga
2 tom john olga bleee
I enabled full text index on all columns
Problem when I do search like this:
SELECT * FROM db WHERE CONTAINS(*,'�tom� AND “john�')
It will return only one row (id 2) – I understand that the full text search does look only at one column at a time because it did not return row #1
Anyway I thought that I can add extra column c4 and when user enters new data it will save data from columns c1, c2, c3 to c4 (varchar(750)) and then I will do search only on c4 – this way it will work the way I want.
1) Is there any better way to do this?
2) How do I sort results by “rank� with SQL
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Aug 25, 2000
I was wondering if anyone has successfully removed the Full Text Index service?
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Dec 13, 2005
I have a table with 13,000,000 records. I want to generate a full-text index on one column (a varchar 2000). I am able to define the full-text index, but when I click on "Start Full population", there is virtually no activity (no disk activity, no CPU activity, very little to indicate anything is happening.
When I check the properties of the catalog, it shows 1 MB size and 0 records in the catalog. The status of the catalog is "idle" and the display in EM shows that the last full population occurred at (about) the time that I generated the population request. I have generated the request by using EM (right click on table) and through SQL Agent with the same result (no catalog generated).
I am running SQL 2000 (SP4) on Windows 2000 (SP4) with 4 GB RAM and sufficient disk space available. I have enabled the full-text service and verified that it is running (I have stopped and restarted it as well).
I have worked with Full Text indexes before and never had any kind of issue before. Any thoughts or suggestions would be welcome.
Regards,
hmscott
CREATE TABLE [OMBRE_AUDIT_LOG] (
[LOG_SEQ_NBR] [numeric](18, 0) IDENTITY (1, 1) NOT NULL ,
[APP_NAME] [varchar] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[USER_ID] [varchar] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[USER_ORGANIZATION] [varchar] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[ACTION_START_DATE] [datetime] NOT NULL ,
[ACTION_END_DATE] [datetime] NULL ,
[ACTION_CODE] [int] NOT NULL ,
[VIEW_NAME] [varchar] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[USER_DEF_TRACKING_NBR] [varchar] (32) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[CMD_XML_STREAM] [varchar] (2000) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL ,
[REC_CREATE] [datetime] NULL CONSTRAINT [DF_OMBRE_AUDIT_LOG_REC_CREATE] DEFAULT (getdate()),
[REC_UPDATE] [datetime] NULL ,
[ATTENTION] [varchar] (40) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[REASON] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
CONSTRAINT [PK_OMBRE_AUDIT_LOG] PRIMARY KEY CLUSTERED
(
[LOG_SEQ_NBR]
)
)
GO
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Mar 18, 2008
How to migrate FULL TEXT indexes from SQL SERVER 2000 to 2005? Is it okay if I migrate the MSDB DB? Do i need to create the physical folders manually?
------------------------
I think, therefore I am - Rene Descartes
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Oct 29, 2007
I am a developer, and I have a disagreement with my DBA. He has convinced management, that SQL 2005 FullText Index is so much overhead on production, that it should NEVER be used under any circumstances. We have a Cold Fusion site, and somehow he convinced management that a bunch of Cold Fusion developers can create a more efficient full text indexing method than by using SQL 2005 Full Text Index. So now we have to come up with a method for doing this in Cold Fusion.
Is there any statistical data that could possible support or refute his statements?
Thanks
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Feb 11, 2008
Hi,
I build some t-sql code to check if full text is installed on the sql server. If not, some sql statements must be not executed. Here is my code:
if (select serverproperty('IsFullTextInstalled')) = 1
Begin
EXEC sp_fulltext_database 'enable'
CREATE FULLTEXT CATALOG [...] WITH ACCENT_SENSITIVITY = OFF AS DEFAULT
CREATE FULLTEXT INDEX ON dbo.Test (Name LANGUAGE 0, Description LANGUAGE 0) KEY INDEX IX_Test_1 ON [...] WITH CHANGE_TRACKING AUTO
ALTER FULLTEXT INDEX ON dbo.Test ENABLE
End
Statement 1 and 2 is not executed, but for statement 3 the server throws the following error:
Full-Text Search is not installed, or a full-text component cannot be loaded.
I don't know why the server tries to execute statement 3, because it is in an if statement.
Any help is welcome.
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Oct 19, 2007
I am tring to use full text indexing. I have created an index and catalog. I can search on stuff that was entered before I created the index using contains or freetext but if I search on anything afterwards the results come up blank. I have created the following database and tables. I am using sql express with advanced services. The primary key I went in after I created the tabled and modified the row to increment by 1
create database RSDB2
use rsdb2
create table support
(ftid int NOT NULL PRIMARY KEY,
problemId varchar(50) NOT NULL,
problemTitle varchar(50) NOT NULL,
problemBody varchar(max) NOT NULL,
lOne varchar(50),
lTwo varchar(50),
lThree varchar(50),
lFour varchar(50),)
create fulltext catalog RSCatalog AS DEFAULT
create unique index ui_Support on support(ftid)
create fulltext index on support(problemBody)
key index PK__support__7C8480AE on RSCatalog
insert into support(problemId, problemTitle, problemBody)
values('win1001','testing outt he database','testing out the databases full texting capabilities again.')
select * from support where freetext(problemBody, 'testing');
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Mar 30, 2006
I have built a Full-Text Index on a indexed view. I'd like to replicate this indexed view from a control database to a live database. What values should I specify for @type and @schema_option for the sp_addarticle sproc to ensure the Full-Text Index is still functional after it's replicated?
For now, I have set @type="indexed view logbased" and @schema_option=0x90000F3. Are these values correct?
Could anyone give me some advice on this?
Thank you very much,
Dandan
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Dec 13, 2007
I've got a full text index working with a "CONTAINS" clause in the SQL. I'm looking for the character that I can place in CONTAINS(*,'WHATHERE') that will return everything. I've tried "*" and "%" but none of them will do it. Does anybody know?
Thanks
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Apr 11, 2000
Are there any examples of maintenance(ReBuild FULL or Incremental) for Full-Text indexes? Are there any index integrity checks that can be done? What is the best way to backup a full-text index?
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Oct 13, 2005
I've been trying to create a full-text index using Enterprise Manager. If I right-click on the table, "Full-Text Index Table" is grayed-out. If I right-click on Full-Text Catalogs, "New Full-Text Catalog" is grayed-out. If I try to start the Full-Text Indexing Wizard it tells me that the "Full-Text Server service needs to be running." The SQL database is on a remote server, and the host assures me that everything on their end is working properly. Does anybody know what I have to do??
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Apr 11, 2007
hello,
I'm looking for a way to populate my index on insertion but not on updates.
I tried each possible value for CHANGE_TRACKING MANUAL|AUTO|OFF and it automatically takes every changes that have been made before in account. is there a way to "flag" the rows that I don't want the server to re-index (i.e. updated rows).
Thanks for reading, any help is welcome.
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Mar 8, 2008
history.ix, index_a.ix, index_d_1.ix, index_di_1.ix, index_i_2.ix,
index_k_2.ix, index_kl_1.ix, index_klh_2.ix, index_n.ix,
index_r_l.ix, index_sv.ix, index_v.ix, index_v_ix.log, indexlog.dat.
This files are generated durin full text search.
now i have doubts regarding this,
1) Can we referrence this files directly
2) Where it will be located in our system?
3) is it loaded for each Full Text Index we created for the table.
4) How this file are used in Full Text Search.
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Aug 6, 2015
I have recently upgraded our Database server from 2005 Standard to 2008 R2 Standard.I am having a problem while replicating Full Text Index in New Infrastructure.
Full text Index was working fine in old infrastructure.
Replication scenario for Old infrastructure
Publisher: SQL Server 2005 Standard
Distributer: SQL Server 2005 Standard
Subscriber: SQL Server 2005 Express with Advance Services
Replication scenario for New Infrastructure
Publisher: SQL Server 2008R2 Standard
Distributor: SQL Server 2008R2 Standard
Subscriber: SQL Server 2005 Express with Advance Services/ SQL Server 2008R2 Standard
Whenever I try to replicate Full text Index by selecting  "Copy Full Text Indexes"= "True" article property in Replication and create snapshot it will automatically set to "Copy Full Text Indexes"= "False" whenever I reopened publication properties or snapshot is created.Is SQL Server 2008 R2 Supports full text Index replication to SQL Server 2005.Do I missed some settings while setting up publication for Full Text Index.
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Sep 1, 2006
Hi,
Can anyone please explain the proper precedure for copying a SQL Express database between two instances?
I am accessing the database without problems from a local web application. And I want to copy the database to a SQL Express instance on another server, running the same web application.
I run into two problems every time I copy:
1) Orphaned users. I have to drop the database users and the re-map the server users to database users.
2) The full-text indexes are not available after copy, so I have to drop and re-create the indexes and the catalog.
And I suspect there's an easier way..
Regards,
Jens Erik
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Dec 17, 2007
hi there!
how can i get the information represented in the table?
Keyword
ColId
DocId
Occ
Crank
1
1
1
Arm
1
1
2
Tire
1
1
4
Maintenance
1
1
5
Front
1
2
1
Front
1
3
1
Reflector
1
2
2
Reflector
1
2
5
Reflector
1
3
2
Bracket
1
2
3
Bracket
1
3
3
Assembly
1
2
6
3
1
2
7
Installation
1
3
4
The Keyword column contains a representation of a single token extracted at indexing time. Word breakers determine what makes up a token.
The ColId column contains a value that corresponds to a particular table and column that is full-text indexed.
The DocId column contains values for a four-byte integer that maps to a particular full-text key value in a full-text indexed table. DocId values that satisfy a search condition are passed from the MSFTESQL service to the Database Engine, where they are mapped to full-text key values from the base table being queried.
The Occ column contains an integer value. For each DocId value, there is a list of occurrence values that correspond to the relative word offsets of the particular keyword within that DocId. Occurrence values are useful in determining phrase or proximity matches, for example, phrases have numerically adjacent occurrence values. They are also useful in computing relevance scores; for example, the number of occurrences of a keyword in a DocId may be used in scoring.
http://technet.microsoft.com/en-us/library/ms142505.aspx
thanks
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Jul 6, 2006
Hi,
The following queries on a fulltext index is returning different results.
select CustomerNameLocal from dbo.Customers where contains (CustomerNameLocal,'A.C.E')
-- returns 1388 records
select CustomerNameLocal from dbo.Customers where contains (CustomerNameLocal,'ACE')
-- returns 1388 records
select CustomerNameLocal from dbo.Customers where contains (CustomerNameLocal,'ace')
-- returns 1388 records
select CustomerNameLocal from dbo.Customers where contains (CustomerNameLocal,'a.c.e')
-- returns 22 records
Can someone let me know why the last query is retuning only 22 records.
Since search on ACE and ace returns the same number of records - I guess there shouldn't be any problem with case sensitivity.
Thanks,
Loonysan
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Nov 2, 2007
When I try to create a full-text catalog on my local database I get an error that I can not find support information for.
Here is the command I run :CREATE FULLTEXT CATALOG asset_search_values_catalog on FILEGROUP ftFileGroup IN PATH 'C:Program FilesMicrosoft SQL ServerMSSQL.1MSSQLData' as default
Here is the error message I get:
Msg 7689, Level 16, State 1, Line 1
Execution of a full-text operation failed. 'No such interface supported'
I check the properties of my database and Full-text is enabled.
I am running SQL Server 2005, on an XP Pro, SP2.
I had originially installed in side by side with SQL Server 2000.
I even tried uninstalling SQL Server 2005 (to try a re-install), I could not even uninstall the database.
What should I do.
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Jan 3, 2008
Hi,
I'm using Sql Express with full-text-search enabled.
The search worked great until last week, suddenly, I started to give the following error message:
The execution of a full-text query failed. "The content index is corrupt."
I've found this KB article:
http://support.microsoft.com/kb/938243
And followed the steps they suggested, but it changed nothing - I'm having the same problem.
Any idea, someone...?
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May 17, 2008
Hi all,
Im new to sql and very interreseted in the Full text features, however when im trying to execute the following query:
USE Updater
CREATE FULLTEXT INDEX ON dbo.Servers (ServerName)
KEY INDEX ServerID
ON UpdaterCatalog
WITH CHANGE_TRACKING AUTO
GO
Where ServerID = Int NOT NULL IDENTITY and ServerName = VarChar(255) NOT NULL and UpdaterCatalog is just created
I get the following error:
Msg 7653, Level 16, State 1, Line 3
'ServerID' is not a valid index to enforce a full-text search key. A full-text search key must be a unique, non-nullable, single-column index which is not offline, is not defined on a non-deterministic or imprecise nonpersisted computed column, and has maximum size of 900 bytes. Choose another index for the full-text key.
I cant seem to figure out why this wont work since unless im mistaking, both fields are legal.
Note that creating an index on any other table doesn't work either.
Im running Sql server standard edition (32 bits) on VISTA Ultimate X64
Thanks in advance,
Koen
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May 9, 2007
We are running a full text index on a single field in one table. The catalogs have grown to over 53GB. Is there a way to shrink these down?
Thanks,
Scott
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