{"id":784,"date":"2019-06-09T01:40:25","date_gmt":"2019-06-09T09:40:25","guid":{"rendered":"https:\/\/db2tutorial.com\/?page_id=784"},"modified":"2020-04-11T06:58:11","modified_gmt":"2020-04-11T14:58:11","slug":"db2-create-index","status":"publish","type":"page","link":"https:\/\/www.db2tutorial.com\/db2-index\/db2-create-index\/","title":{"rendered":"Db2 CREATE INDEX"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the Db2 <code>CREATE INDEX<\/code> statement to define a new index on a table.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to Db2 CREATE INDEX statement<\/h2>\n\n\n\n<p>To define an index for a table, you use the <code>CREATE INDEX<\/code> statement. The basic syntax of <code>CREATE INDEX<\/code> statement is the following:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">INDEX<\/span> index_name \n<span class=\"hljs-keyword\">ON<\/span> table_name(column1, column2, ...);\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this syntax:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>First, specify the name of the index after the <code>CREATE INDEX<\/code> keywords.<\/li><li>Then, specify the table to which the index belongs and one or more columns included in the index.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Db2 CREATE INDEX examples<\/h2>\n\n\n\n<p>We&#8217;ll use the <code>authors<\/code> table from the <a href=\"https:\/\/db2tutorial.com\/getting-started\/db2-sample-database\/\">sample database<\/a> for the demonstration.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"194\" height=\"131\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/03\/authors.png\" alt=\"\" class=\"wp-image-82\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">1) Using Db2 CREATE INDEX statement to create an index on one column example<\/h3>\n\n\n\n<p>This statement finds the authors whose last name is <code>Anderson<\/code>.<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n    first_name, \n    last_name\n<span class=\"hljs-keyword\">FROM<\/span> \n    <span class=\"hljs-keyword\">authors<\/span>\n<span class=\"hljs-keyword\">WHERE<\/span> \n    last_name = <span class=\"hljs-string\">'Anderson'<\/span>;\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The query optimizer had to scan the whole <code>authors<\/code> able to locate the authors whose the last name is <code>Anderson<\/code>.<\/p>\n\n\n\n<p>Here is the query plan of the query:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"481\" height=\"127\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-scan-for-first-name.png\" alt=\"Db2 CREATE INDEX - scan for first name\" class=\"wp-image-786\" srcset=\"https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-scan-for-first-name.png 481w, https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-scan-for-first-name-300x79.png 300w\" sizes=\"auto, (max-width: 481px) 100vw, 481px\" \/><\/figure>\n\n\n\n<p>To improve the speed of the query, you can create an index on the <code>last_name<\/code> column as follows:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">INDEX<\/span> ix_last_name\n<span class=\"hljs-keyword\">ON<\/span> <span class=\"hljs-keyword\">authors<\/span>(last_name);\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"313\" height=\"345\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-index-on-last-name-column.png\" alt=\"Db2 CREATE INDEX - index on last name column\" class=\"wp-image-787\" srcset=\"https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-index-on-last-name-column.png 313w, https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-index-on-last-name-column-272x300.png 272w\" sizes=\"auto, (max-width: 313px) 100vw, 313px\" \/><\/figure>\n\n\n\n<p>Once the <code>ix_last_name<\/code> index created, you can execute the query that finds the authors whose last name is <code>Anderson<\/code> again.<\/p>\n\n\n\n<p>This time the query optimizer uses the <code>ix_last_name<\/code> to find the authors. As you can see, the cost of locating the authors is reduced significantly.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"480\" height=\"126\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-use-last-name-index.png\" alt=\"Db2 CREATE INDEX - use last name index\" class=\"wp-image-789\" srcset=\"https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-use-last-name-index.png 480w, https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-use-last-name-index-300x79.png 300w\" sizes=\"auto, (max-width: 480px) 100vw, 480px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">2) Using Db2 CREATE INDEX statement to create an index on multiple columns example<\/h3>\n\n\n\n<p>First, delete the <code>idx_last_name<\/code> by using the <code>DROP INDEX<\/code> statement:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">INDEX<\/span> ix_last_name;\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>And then create a new index that includes both <code>last_name<\/code> and <code>first_name<\/code> columns:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">INDEX<\/span> ix_name\n<span class=\"hljs-keyword\">ON<\/span> <span class=\"hljs-keyword\">authors<\/span>(last_name, first_name);\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The following query finds the author whose last name is <code>Anderson<\/code> and the first name is <code>Thomas<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n    author_id,\n    first_name, \n    last_name\n<span class=\"hljs-keyword\">FROM<\/span> \n    <span class=\"hljs-keyword\">authors<\/span>\n<span class=\"hljs-keyword\">WHERE<\/span> \n    last_name = <span class=\"hljs-string\">'Anderson'<\/span> <span class=\"hljs-keyword\">AND<\/span>\n    first_name = <span class=\"hljs-string\">'Thomas'<\/span>;<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The query optimizer can use the <code>ix_name<\/code> index for searching. Here is the query plan:<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"472\" height=\"112\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-query-plan-for-an-index-on-multiple-columns.png\" alt=\"Db2 CREATE INDEX - query plan for an index on multiple columns\" class=\"wp-image-790\" srcset=\"https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-query-plan-for-an-index-on-multiple-columns.png 472w, https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-query-plan-for-an-index-on-multiple-columns-300x71.png 300w\" sizes=\"auto, (max-width: 472px) 100vw, 472px\" \/><\/figure>\n\n\n\n<p>This query finds authors whose last name is <code>Brown<\/code>:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n    author_id,\n    first_name, \n    last_name\n<span class=\"hljs-keyword\">FROM<\/span> \n    <span class=\"hljs-keyword\">authors<\/span>\n<span class=\"hljs-keyword\">WHERE<\/span> \n    last_name = <span class=\"hljs-string\">'Amy'<\/span> \n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"474\" height=\"109\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-query-plan-for-search-value-on-leftmost-column.png\" alt=\"Db2 CREATE INDEX - query plan for search value on leftmost column\" class=\"wp-image-791\" srcset=\"https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-query-plan-for-search-value-on-leftmost-column.png 474w, https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-query-plan-for-search-value-on-leftmost-column-300x69.png 300w\" sizes=\"auto, (max-width: 474px) 100vw, 474px\" \/><\/figure>\n\n\n\n<p>The query optimizer also can use the index <code>ix_name<\/code> for searching because the <code>last_name<\/code> column is the leftmost column of the index.<\/p>\n\n\n\n<p>However, if you find the authors by the first name, the query optimizer is not able to leverage the <code>ix_name<\/code> index:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"SQL (Structured Query Language)\" data-shcb-language-slug=\"sql\"><span><code class=\"hljs language-sql\"><span class=\"hljs-keyword\">SELECT<\/span> \n    author_id,\n    first_name, \n    last_name\n<span class=\"hljs-keyword\">FROM<\/span> \n    <span class=\"hljs-keyword\">authors<\/span>\n<span class=\"hljs-keyword\">WHERE<\/span> \n    first_name = <span class=\"hljs-string\">'Amy'<\/span> \n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">SQL (Structured Query Language)<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">sql<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"475\" height=\"111\" src=\"https:\/\/db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-query-plan-for-search-value-on-rightmost-column.png\" alt=\"Db2 CREATE INDEX - query plan for search value on rightmost column\" class=\"wp-image-792\" srcset=\"https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-query-plan-for-search-value-on-rightmost-column.png 475w, https:\/\/www.db2tutorial.com\/wp-content\/uploads\/2019\/06\/Db2-CREATE-INDEX-query-plan-for-search-value-on-rightmost-column-300x70.png 300w\" sizes=\"auto, (max-width: 475px) 100vw, 475px\" \/><\/figure>\n\n\n\n<p>So, when you create an index on multiple columns, the order of the columns in the index definition is important. It is a good practice to place the columns that are often used in the <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-where\/\">WHERE<\/a><\/code> clause or <a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-join\/\">join<\/a> condition at the beginning of the list.<\/p>\n\n\n\n<p>In this tutorial, you have learned how to use the Db2 <code>CREATE INDEX<\/code> statement to create a new index on a table.<\/p>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful ?<\/div>\n\t\t<div class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"784\"\n\t\t\t\tdata-post-url=\"https:\/\/www.db2tutorial.com\/db2-index\/db2-create-index\/\"\n\t\t\t\tdata-post-title=\"Db2 CREATE INDEX\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 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