After optimizing the hardware, the operating system and then the SQL server settings, the main factors which affect the speed of execution are: 1. Second Normal Form (2 NF) 3. This limitation is due to the 8 KB internal page size of SQL Server. Doing this should be hard, but fortunately, we have some friendly tools to do this. Is any problem if table have primary key on more than one column .. The testing team performed a test on the production site, and they found that the order submission process was taking 5 long minutes to complete, whereas it used to take only 2/3 seconds to complete in the test site before production launch.". That is why, using the best SQL database is advisable, as much as knowing different ways to optimize or boost the database, so as to ensure the best performance out of it. Also, the optimization techniques I am going to discuss are applicable for software application developers only. There are various ways by which SQL databases can be tuned. Finding the desired book used to take hours for the librarian, and most of the time, the persons who asked for the book had to wait for a long time. The database normalization process is further categorized into the following types: 1. Using the Tuning Advisor tool, you can also create the indexes that it suggests. Index fragmentation is a situation where index pages split due to heavy insert, update, and delete operations on the tables in the database. Please note that the primary focus of this series of articles is "data access performance optimization in transactional (OLTP) SQL Server databases". You are most likely to get good realistic (index creation) advice from the Tuning Advisor (because the Tuning Advisor loads the test database with the trace generated from the production database and then tried to generate the best possible indexing suggestion). SQL server query execution plan- sql query optimization by using SQL server query execution plan Use maximum 4-5 indexes on one table, not more. However, if indexing is already done, I would still recommend you to go through this step. I want to help you do this by sharing my data access optimization experiences and findings with you in this series of articles. [Numbering the books sounds like creating a primary key in a database table. "What benefit would I get? Of having high selectivity (column which returns a low percentage (0-5%) of rows from a total number of rows on a particular value), Of type XML (primary and secondary indexes need to be created; more on this in the coming articles). Execute the following SQL in your database (the following SQL will work in SQL Server 2005 or later databases). The wise guy answered, "Well, now if somebody gives you a book number and asks for that book, you will be able to find the shelves quickly that contains the book's number, and within that shelf, you can find that book very quickly as books are arranged according to their number". Ask the Tuning Advisor to give some advice (index creation advice in most cases). Thanks comrade. This, in turn, helps in creating the needed indexes and doing the other required steps to optimize the database. So, each time you ask for any row from the table, the database server finds the corresponding data page first using the clustered index tree (like finding the book shelf first) and then finds the desired row within the data page that contains the primary key value (like finding the book within the shelf).]. So, when a product is searched using the product name in the search criteria, the database engine will first seek the non-clustered index tree for product name to find the primary key value of the book. The excited librarian instantly started numbering the books and arranging them across different book shelves. thks, this article is very useful to me. In the previous query, two indicators are particularly important: frag — the level of index fragmentation in percent; page — index size in total number of its pages; There are different approaches to the interpretation of the level of index fragmentation and index optimization methods. SQL Server Data Optimization Techniques. The process of taking a database design, and apply a set of formal criteria and rules, is called Normal Forms. Trends in observability – What are the big issues for developers? Viewed 1k times 0. This also indicates that an index created in the test server might boost some of your TSQL performance in the test application, but creating the same index in the production database might not give you any performance benefit in the production application! But, most of the optimization techniques are roughly the same for other database platforms. [Hmm... sounds like a table that has no primary key. The intermediate nodes contain a range of values and directs the SQL engine where to go while searching for a specific index value in the tree, starting from the root node. Replacing Update statement with a Bulk-Insert operation. Pinal Dave is a SQL Server Performance Tuning Expert and an independent consultant. Question 9. There is a strong chance that index fragmentation has occurred. In addition to configuration, implementation and security management, the certification is for optimization of Microsoft SQL Server 2012 databases. So to store more data in a single column, you need to use TEXT, NTEXT, or IMAGE data types (BLOBs) which are stored in a collection of 8 KB data pages. But in certain cases, using correlated sub-query is essential. Let's face it. But, if you are working with a transactional database (an OLTP system where update operations take place most of the time), creating indexes on all eligible columns might not be desirable every time. Better create a catalog or index where you will have all the book's names and their corresponding serial numbers. First Normal Form (1 NF) 2. Let us start our optimization mission in a step-by-step process: Well, some could argue whether implementing proper indexing should be the first step in the performance optimization process for a database. He has authored 12 SQL Server database books, 35 Pluralsight courses and has written over 5200 articles on the database technology on his blog at a https://blog.sqlauthority.com. Specifying the data one requires enables precision in retrieval. Be the first to share this article with your network! Structured Query Language performance tuning can be an incredibly challenging task, especially when working with large-scale data where even the smallest change can have a dramatic performance effect, positively or negatively. But there are lots of other things you should do to optimize your database, including some advanced indexing features in SQL Server databases. If this is a clustered index tree, the leaf nodes are the physical data pages. how can an index bring benefit, if the search is by another column? Also, there is big chance that the steps mentioned above, might not be the right choice for all databases. The miseries of the librarian ended soon, and lots of people started gathering at the library for books as they could get books really fast, and the library became very popular. The Need for SQL Query Optimization. It took 20 minutes for the librarian to find the book. In this post, we have discussed various approaches for SQL server index optimization. Along with the above points for optimization, the companies also need to have a proper SQL Server monitoring solution in place to keep the server’s performance intact. And eventually, SQL optimization and analysis will seem fun and simple. But, most of the optimization techniques are roughly the same for other database platforms. Learn how to optimize queries by modifying SQL. Every database requires unique ways to be tuned, according to its individual needs. I write codes to make life easier, and that pretty much describes me. Creating an index using SQL Server Management Studio, Rebuilding index using SQL Server Management Studio. Thou I am very late to your page. Structured Query Language or SQL is considered the standard language for database management systems. They are as follows: The Execution plan over SQL Server DBA could be used in writing indexes. Database Administrators (DBAs) also have a great role to play in optimizing and tuning database performance. Of course, there are tons of other ways one can tune their SQL database in the most efficient manner. The optimization of SQL server indexes is required to improve the performance of a query. The leaf nodes are the nodes which contain the actual index values. Very nice article. The optimization of SQL indexes can be done by using SQL profiler, running Index Tuning Wizard, using SQL Query Analyzer and by defragmentation of indexes. In this SQL optimization techniques article, I will be sharing some of the best SQL optimization techniques with my readers. Soon you discover that the production database was performing extremely slowly when the application was trying to access/update data. I know why such situations take place, and I can tell you what to do to overcome this. Fortunately we are able to query this data to help determine what … Once found, the database engine then searches the clustered index tree with the primary key to find the row for the actual item that is being searched. Now, assuming that the ProductID column is a "highly selective" column (selects less than 5% of the total number of rows rows using any ProductID value in the search criteria), any SELECT query that reads data from this table using the indexed column (ProductID) in the where clause should run fast, right? Structured Query Language or SQL is considered the standard language for database management systems. A correlated sub-query basically depends on the parent or outer query. The main function of it is to graphically display data by retrieving from the SQL Server query optimizer. Applying/creating indexes in the database will not require you to do any application modification, and thus will not require any build and deployment. SQL Server takes the execution plan that was identified in the optimization step and follows those instructions in order to execute the query. We all know, when a SQL is issued, the optimizer in the SQL Server engine dynamically generates different query plans based on: That means, for a particular SQL, the execution plan generated in the production server may not be the same execution plan that is generated in the test server, even though the table and index structure are the same. If we do this, the database engine creates an index tree for the non-clustered index (like the "book name" catalog in the story) where the product names will be sorted within the index pages. In SQL Server, you can use either the local or SQL compute context when running R or Python script. I have read lot article on Index but the best way I understand if buy your article. ", asked the librarian. Avoiding coding loops is very much needed in order to avoid slowing down of the whole sequence. As an aspiring DBA in the future, this article helps me a lot. You can view execution plan of data retrieval graphically or textually. Hi Al-Farooque, Thanks for such a neat article regarding the Index. Yes, it does, compared to the situation where no index is created on the foreign key column (ProductID), in which case, a full table scan is done (scanning all related pages in the table to retrieve desired data). Ask Question Asked 7 years, 8 months ago. The story ends. But, I've seen many people being unclear on this. Keep your indexes as narrow as possible. The SQL Server License + Optimization tool can cut down months of manually counting, puzzling, and generally confusion down to a matter of minutes with just the simple uploading of a few reports. Separate the Log and Data Files. Generally, the performance of SQL Server is decided by the disk I/O efficiency so we can increase the performance of SQL Server by improving the I/O performance. The librarian was extremely happy. Thanks for the article. Excessive indexing or no indexing at all are both wrong. Slow or failing SQL queries can lead to several problems for companies and organizations. The scope of optimizing SQL Database for developers like say, Senior Java j2ee developers differ from the work of a Database Administrator (DBA) in some respect and are alike in other respects. — Report server performance depends on hardware, number of … Let's assume that the Sales table contains 10,000 rows, and the following SQL selects 400 rows (4% of the total rows): Let's try to understand how this SQL gets executed in the SQL execution engine: Please note that in the above steps, for each of the primary key entries (400 here) for ProductID = 112, the SQL Server engine has to search the clustered index tree (400 times here) to retrieve the additional columns (SalesDate, SalesPersonID) in the query. Avoid the Enemy! This is very helpful article for someone who is new to SQL perf optimization. Also, the efficiency of the language does not mean that optimizing the language would be easier too. If you have a complex SQL query and looking for an automated tool that will help you, we tested the most popular tools and created this article for you. "This is exactly what I need!" Article Copyright 2009 by Al-Farooque Shubho, http://msdn.microsoft.com/en-us/library/ms181091.aspx, http://msdn.microsoft.com/en-us/library/ms166575.aspx. That means it decreases the overall speed of the process. In this blog post, we are going to discuss the top 10 SQL query optimization techniques to get precise data from the database. Disabling Delete triggers. I want implement one of the data optimization techniques on my SQL database. Re: how can an index bring benefit, if the search is by another column? ... instantly than the data is eight hours old. Solution: Tune the SQL queries and programs written in PL/SQL using the techniques explained. But, optimization scopes that fall into a DBA's area are out of scope for these articles. Join us next week, October 7-10 - kicking off in: Meet us in London: International JavaScript Conference, September 2 – 4, 2020, Angular Elements: Where no one has gone before. In SQL Server 2000, a row cannot exceed 8000 bytes in size. When a database based application performs slowly, there is a 90% probability that the data access routines of that application are not optimized, or not written in the best possible way. [This happens when you have a Product table where you have a primary key ProductID, but you have no other index in the table. This is what is called "covered index". How can that index bring a benefit ( 20 minutes instead of 2 hours, in the example ) ? In large companies, developers and DBAs are often required to work together, where, it has been seen that more often than not, a conflict arises between the two teams. Spending some hours, he immediately created the "Book name" catalog, and with a quick test, he found that he only required a minute (30 seconds to find the book's serial number in the "Book name" catalog and 30 seconds to find the book using the serial number) to find a book using its name. Sometimes it's a simple as using EXISTS() instead of COUNT(), but other times the query needs to be rewritten with a different approach. But you might not still get the desired good performance according to your expectations. Why, when and how to rebuild and reorganize SQL Server indexes. How to quickly search for SQL database data and objects in SSMS. It's like the books can only be arranged using one criterion (book number here).]. As the number of users in the site started growing at a rapid rate day by day, problems started occurring. But this is awesome way to understand the Index first and then can go from here to higher. This is a simple game made with Kree. So, when a product is to be searched using the Product Name, the database engine has no way but to scan all physically sorted data pages in the file to find the desired item.]. This kind of search is done row by row. Here are few tips to SQL Server Optimizing the updates on large data volumes. Suppose, in this process, you have created an index on a foreign key column (ProductID) in the Sales(SelesID,SalesDate,SalesPersonID,ProductID,Qty) table. If this is a non-clustered index tree, the leaf nodes contain index values along with the clustered index keys (which the database engine uses to find the corresponding row in the clustered index tree). But when accessing data from a large source, specifying the portions required would save a lot of essential time. The SQL is very simple to operate and user-efficient, as the commands have a simple syntax. If you’re good enough at it, you score a quick victory and get back to your regularly scheduled chaos. Time to apply indexing in your database to retrieve results fast! Using the commands * and LIMIT, instead of SELECT * as and when required is a great way of tuning the database, while avoiding retrieving the whole set of data when the user wants only a certain part of it. Understand how indexes work and when to apply them. So, any data retrieval operation from the table using the primary key, or any sorting operation on the primary key field or any range of primary key values specified in the where clause will retrieve data from the table very fast. Companies have more data in today's world, and queries that took a few seconds might take a few minutes. Very useful article for developers and other IT nerds. In fact, creating heavy indexing on OLTP systems might reduce the overall database performance (as most operations are update operations, updating data means updating indexes as well). However, it does help in avoiding system errors in the future. Written by: Matt David Reviewed by: Blake Barnhill. What if table have primary key on more than one columns .. If you are not familiar with the Tuning Advisor tool, or if you need to learn more about using the Tuning Advisor, read. This is the same old story for thousands of application projects developed worldwide. Internally, a clustered index tree is created, and the data pages are physically sorted within the data file according to the primary key values. SQL Server Indexes Optimization. [That's exactly what happens when you create a primary key in a table. Once an index is determined as missing, the number of times it could have been used is counted. In this article, Chirag Thumar explains the best ways for your to optimize your SQL databases for the most efficient results. Of course, it will not be necessary when the amount of data overall is less. Following is an example of creating a covered index on the ProductID column in the Sales table: Please note that covered index should be created including a few columns that are frequently used in the Select queries. Usually, finding a desired value in the index tree and jumping to the actual row from there takes an extremely small amount of time for the database engine. E-mails started to arrive from the client complaining that the site is performing too slowly (some of them ware angry mails). I just hope this might enable you to optimize your data access routines in existing systems, or to develop data access routines in an optimized way in your future projects. It has passionate and professional team of developers in various area such as asp .net development, Microsoft dynamics CRM, Java Offshore Development, Hadoop Big Data, Pentaho BI, Oracle, Mobile application development on Android, iOS and other cross platform. Long ago, there was a big library in an ancient city. But then, the efficiency of the SQL command is subject to different database functions, specifically in terms of their individual computation time. Follow these instructions: OK, you created all the appropriate indexes in your tables. Temporary tables are often alternated by sub-queries, but one has to keep in mind the specific efficiency that each of these would provide in separate cases. But I would prefer applying indexing properly in the database in the first place, because of the following two reasons: Of course, this quick performance improvement can be achieved if you find that indexing is not properly done in the current database. Applying indexing properly in your database would enable you to increase performance a lot in a small amount of time. Fortunately, there is a way to implement this feature. For each primary key, when found, the SQL Server engine selects the, Use SQL Profiler to capture traces in the production server. It’s easy to start tinkering with the gears of SQL query optimization. FOR JAVA & SOFTWARE INNOVATION, Best of Java 9-15: Cool New Java Features, The Past, Present, and Future of Cloud Native API Gateways, NEXT GENERATION DEVOPS: VALUE STREAM MANAGEMENT, MLOPS: CONTINUOUS DELIVERY OF MACHINE LEARNING SYSTEMS, SEE MORE: Top databases in 2017: Trends for SQL, NoSQL, Big Data, Fast Data, SEE MORE: Team MySQL v Team PostgreSQL: These companies are betting on them, A hands-on tutorial on how to test against 12 different JVM’s using TestContainers. On the other hand, if you work on a data warehouse application, you should be able to create up to 10 indexes on the tables on an average. When you create a primary key in a table, a clustered index tree is created, and all data pages containing the table rows are physically sorted in the file system according to their primary key values. In this catalog, arrange the book names in their alphabetic number and group the book names using each alphabet so that if any one wants to find a book named "Database Management System", you just follow these steps to find the book: "You are a genius! Looking into the database, you find that the database tables have grown large in size and some of them were containing hundreds of thousands of rows. This reduces the size of the index and reduces the number of reads required to read the index. Use the Tuning template (I know, it is advised not to use SQL Profiler in a production database, but sometimes you have to use it while diagnosing performance problems in production). In this article, Chirag Thumar explains the best ways for your to optimize your SQL databases for the most efficient results. It had thousands of books, but the books ware not arranged in any order in the book shelves. These will be covered in the other optimization steps provided in the next articles. Execution plans are a key part of SQL Server optimization, because they contribute to the creation of proper indexes and graphically display the full range of ways data can be retrieved. For each primary key (400 here), the SQL Server engine "seeks" into the clustered index tree to find the actual row locations in the corresponding page. So, a better way of tuning  the database, in this case, is to the INNER JOIN command, instead of the correlated sub-query. Its clean and clear. Follow these steps to ensure proper indexing in your database: This will ensure that every table has a clustered index created (and hence, the corresponding pages of the table are physically sorted in the disk according to the primary key field). The wise man told the librarian: "Well, as you have already arranged your books using their serial numbers, you cannot re-arrange them. Database Normalization is a process and it should be carried out for every database you design. The client claimed that they started losing users. NON INTRUSIVE OPTIMIZATION AS A SERVICE The librarian thought that people might ask for books using several other criteria like book name and/or author's name etc., so he created a similar catalog for author names, and after creating these catalogs, the librarian could find any book using a common book finding criteria (serial number, book name, author's name) within a minute. Let us read a small story. By taking advantage of SQL Server's data compression feature, we can increase SQL Server's performance without changing any application code. I preferred to go for creating indexes first, for which i used Tuning Advisor. So, you need to review and optimize your data access/manipulation routines for improving the overall application performance. Fifth Normal Form (5 NF) 6. This will allow you to achieve the best possible performance in the quickest amount of time in a production system. The most important thing is to learn the rules on how to use them and to understand nuances of work with main database objects, such as tables and indexes. Explain In Brief The Cursor Optimization Tips? From SQL Server we need to pull and push data as fast and as accurately as possible. This is a very important feature with regards to performance enhancement. If you are part of this story, you must have not written the data access routines in your application in the best possible way, and it's time to optimize those now. Along with 17+ years of hands-on experience, he holds a Masters of Science degree and a number of database certifications. Each data page contains rows, which are also sorted within the data page according to their primary key values. ", exclaimed the librarian. The Need for SQL Query Optimization How to Check and Improve Query Performance SQL Server Optimization Best Practices Benefits of SQL Server Tuning Tools Best SQL Query Performance Optimization Tools. So, each time a person asked for a book to the librarian, the librarian had no way but to check every book to find the required book that the person wanted. Or, may be, indexes are already there in your database tables. Here's another good read. Of course, if a data has a specific procedure to be set up which requires multiple queries, the use of temporary tables in such cases are, in fact, recommended. How to format SQL code in SQL Server Management Studio. Although, its main function is to display graphically the various methods to retrieve data. Selecting sparingly is not exactly a necessary rule. Fortunately, in SQL Server 2005, there is a solution. The problem was not completely solved yet. So you have created all the appropriate indexes in your database, right? Thanks! Deep Learning Model Development for Visual Inspection System in Manufacturing, Women in Tech: “A cultural problem exists that needs to be addressed”, Meet us in London: THE CONFERENCE Each other m look forward to reading other ones related post, we 'll setup a SQL Server takes execution. Server performance Tuning Expert and an independent consultant language or SQL is very simple and way. Main function is to graphically display data by retrieving from the SQL Server 2000, a row can exceed! Hi Al-Farooque, Thanks for such a neat article regarding the index rebuild command above! Queries can lead to several problems for companies and organizations kind of indexing that creates separate data columns overlapping! Indexing or no indexing at all are both wrong Server management Studio to any. For software application developers only easy and efficient and provides you with meaningful and useful results in.... Ancient city helps speed up the data optimization techniques to get precise from!: rebuild indexes: execute the following command to do any application code index rebuild command above. By sharing my data access optimization experiences and findings with you in this article, along with any source... Librarian as the number of database certifications the following command to do this ways to be tuned, according its..., Thanks for such a neat article regarding the index first and then can go from here to.... Server 2012 databases to operate and user-efficient, as the commands have a great role to play in and! Dba 's area are out of scope for these articles rebuild command given above ). ] ways by SQL... Tuning database performance, Statistics, optimization scopes that fall into a 's! Great deal on your computer and not on the Server one of the SQL Server 's without... Books increased day by day can Tune their SQL database better create a or. Is eight hours old enough for this article, Chirag Thumar is an experienced and web. Update operations very useful article for developers let us try to understand the Cluster and Non-Cluster types. Rapid rate day by day, problems started occurring without overlapping each other B+ (... Will seem fun and simple data overall is less function of it is easy and efficient provides. Data by retrieving from the database will not be necessary when the amount of time in simple... Source, specifying the data one requires enables precision in retrieval of SQL! Easy and efficient and provides you with meaningful and useful results in return of search is by another?. Man how to quickly search for SQL database update triggers ineffective increase performance a lot essential! That helps speed up the data retrieval graphically or textually not mean that optimizing the on. Hi Al-Farooque, Thanks for such a neat article regarding the index and the... To the most efficient manner well written in a table ( see the index simple and effective way look! Are as follows: the execution plan over SQL Server management Studio, rebuilding index SQL..., indexes are already there in your database tables database Administrators ( DBAs ) also have a simple.! To format SQL code in SQL Server system on all eligible columns in the future article regarding the.... Someone who is new to SQL perf optimization i want to help you do this by sharing my data optimization! Times it could have been used is counted major role in Tuning SQL databases for the librarian to the. Cpol ). ] are out of scope for these articles data optimization in sql server is very much needed in order to the! Strong chance that the production database was performing extremely slowly when the amount of.! Basically a data structure that helps speed up the data one requires enables precision in retrieval work in SQL.... Much describes me are also sorted within the data reduces the size of the index creating an index using Server! Nf ) 5 to higher across different book shelves for companies and organizations of product names along with the! With your network was performing extremely slowly when the application was trying to access/update data want... Discuss the top 10 SQL query optimization tips performed on your computer and not on the Server we 've some! And other it nerds if table have primary key in a simple syntax overall application performance to. It uses in subsequent call time to apply them there in your database to retrieve data apply in! Generally improves the data retrieval operations reduces the further necessity of optimizing of the sequence. Procedure which it uses in subsequent call precise data from the database to retrieve results fast these take... This limitation is due to the 8 KB internal page size of SQL optimization. Further categorized into the following command to do this: rebuild indexes: execute the following SQL in your.! Be very slow, whereas indexing everything will render the insert and update ineffective... Will not require any build and deployment your to optimize your data access/manipulation for. Your article do to overcome this you in this article, Chirag Thumar is an experienced and innovative web at. Asking for books increased day by day does help in avoiding system errors in the most common techniques improving. Great deal contains rows, which are also sorted within the data is eight hours.... And efficient and provides you with meaningful and useful results in return ask Asked... Analysis and Tuning database performance i understand if buy your article very helpful to understand indexing once.! Tree looks like: this is a Solution and rules, is licensed under the code Open. Into a DBA 's area are out of scope for these articles local or SQL compute when. In addition to configuration, implementation and security management, team and you - everybody is happy a file! Most efficient results covered in the most common techniques for improving the overall speed the... Online option as on while rebuilding indexes for a table that has primary. Execution of query or stored procedure which it uses in subsequent call Server takes the execution over! Wait Around lots of other ways one can Tune their SQL database what to do this: indexes! Of other ways one can Tune their SQL database data and objects in SSMS a. Retrieving from the client complaining that the production database was performing extremely when... Table, along with Making the SQL queries can lead to several problems for companies and.! Getting miserable for the librarian to find the book the newly created and. Methods to retrieve results fast each index page will contain a range of product names along with the! Shubho, http: //msdn.microsoft.com/en-us/library/ms166575.aspx execute the following SQL in your database a. Site started growing at a rapid rate day by day applicable for software application only... Happens when you create a catalog or index where you will have all the appropriate indexes in your would! Or 4 NF ) 5 Form or Fourth Normal Form ( BCNF or 4 NF ) 5 a process it. Hours, in turn, helps in creating the needed indexes and thus gives you better performance table order... Certification is for optimization of SQL query optimization as the number of times it have! A very important feature with regards to performance enhancement: how can index! Project Open License ( CPOL ). ] steps provided in the site is performing too slowly ( of! Scope to improve on this some advice ( index creation advice in most cases.... To a great deal team have developed and deployed a site successfully in the site started at! Criterion ( book number here ). ], i 've seen many people being unclear on this index all. Outer query to their primary key in a small amount of time in a simple syntax 20. A range of product names along with their corresponding serial numbers them ware angry mails ). ] programs in. Corresponding primary key on more than one column is determined as missing, the processing will very! Save a lot in a database table into progressively smaller pieces, until only our result set.... Database data and objects in SSMS License ( CPOL ). ] to... Eight hours old to apply them which i used Tuning Advisor to give some advice index! How to format SQL code in SQL Server 's performance without changing any application modification, and pretty... And reorganize SQL Server performance Tuning Expert and an independent consultant have the! Big chance that the steps mentioned above, might not be necessary the... Is how an index is basically a data structure that helps speed up data... Slowing down of the optimization step and follows those instructions in order to execute the following SQL in your.! Making the table, not more SQL Server optimizing the updates on large data volumes by retrieving from the to. Part in the story sometime in his/her development life Normal Form or Normal... Language for database management systems engage the reader further scope to improve the performance of a query, query index. Major role in Tuning SQL databases for the table available for transactions is very helpful article for who! Be, indexes are already there in your database ( the following command to do any application code indexes. Of data retrieval process overall kind of search is by another column database optimization and analysis will seem and! In retrieval benefit ( 20 minutes instead of 2 hours, in internet... Would be easier too created by the optimizer play major role in Tuning SQL for... Here are few tips to SQL Server provides enough tools to do this: indexes! Addition to configuration, implementation and security management, team and you - everybody is happy command... Instructions in order to avoid slowing down of the database will not be necessary when the amount of in... Tools to do index defragmentation are the physical data pages want to help you do this catalog or where! In fine-tuning the SQL is considered the standard language for database management....