{"id":512,"date":"2019-06-01T19:45:22","date_gmt":"2019-06-02T03:45:22","guid":{"rendered":"https:\/\/db2tutorial.com\/?page_id=512"},"modified":"2020-04-11T06:59:07","modified_gmt":"2020-04-11T14:59:07","slug":"db2-truncate-table","status":"publish","type":"page","link":"https:\/\/www.db2tutorial.com\/db2-basics\/db2-truncate-table\/","title":{"rendered":"Db2 TRUNCATE TABLE"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the Db2 <code>TRUNCATE TABLE<\/code> statement to delete all rows from a table.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Introduction to Db2 TRUNCATE TABLE statement<\/h2>\n\n\n\n<p>The <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-delete\/\">DELETE<\/a><\/code> statement without a <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-where\/\">WHERE<\/a><\/code> clause allows you to delete all rows from a table. However, if you have a table with a large volume of data, the <code>DELETE<\/code> statement will not be efficient.<\/p>\n\n\n\n<p>Fortunately, Db2 provides the <code>TRUNCATE TABLE<\/code> that also delete all rows from a table, but in a more efficient way.<\/p>\n\n\n\n<p>The following shows the syntax of the <code>TRUNCATE TABLE<\/code> statement:<\/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\">TRUNCATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> table_name\n&#91;<span class=\"hljs-keyword\">DROP<\/span> <span class=\"hljs-keyword\">STORAGE<\/span> | <span class=\"hljs-keyword\">REUSE<\/span> <span class=\"hljs-keyword\">STORAGE<\/span>]\n&#91;<span class=\"hljs-keyword\">IGNORE<\/span> <span class=\"hljs-keyword\">DELETE<\/span> <span class=\"hljs-keyword\">TRIGGERS<\/span> | RESTRICT <span class=\"hljs-keyword\">WHEN<\/span> <span class=\"hljs-keyword\">DELETE<\/span> <span class=\"hljs-keyword\">TRIGGERS<\/span>]\n&#91;<span class=\"hljs-keyword\">IMMEDIATE<\/span>]\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<p>First, specify the name of the table from which you want to delete all data.<\/p>\n\n\n\n<p>Second, the <code>DROP STORAGE<\/code> or <code>REUSE STORAGE<\/code> option determines whether Db2 should drop or reuse the existing storage allocated for the table.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>The <code>DROP STORAGE<\/code> releases all storages allocated for the table and make the storage available for use for the same table or any other tables within the tablespace.<\/li><li>The <code>REUSE STORAGE<\/code> makes all storages empty, but continues allocating for the table.<\/li><\/ul>\n\n\n\n<p>The default option is <code>DROP STORAGE<\/code>.<\/p>\n\n\n\n<p>Third, the <code>IGNORE DELETE TRIGGERS<\/code> and <code>RESTRICT WHEN DELETE TRIGGERS<\/code> options determine the behavior of the truncate operation when the table has associated delete triggers.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>The <code>IGNORE DELETE TRIGGERS<\/code> option will not fire any trigger defined on the table.<\/li><li>The <code>RESTRICT WHEN DELETE TRIGGERS<\/code> option will result in an error if the table has one or more deleted triggers.<\/li><\/ul>\n\n\n\n<p>By default, the <code>TRUNCATE TABLE<\/code> statement uses <code>IGNORE DELETE TRIGGERS<\/code> option.<\/p>\n\n\n\n<p>Fourth, the <code>IMMEDIATE<\/code> option, if specified, will delete all rows from the table without the ability to roll back. On the other hand, if you don&#8217;t specify the <code>IMMEDIATE<\/code> option, you can use a <code>ROLLBACK<\/code> statement to undo the truncate operation.<\/p>\n\n\n\n<p>Notice that when you use the <code>TRUNCATE TABLE<\/code> statement in a transaction, you must place it as the first statement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Db2 TRUNCATE TABLE examples<\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the <code>TRUNCATE TABLE<\/code> statement.<\/p>\n\n\n\n<p>First, <a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-create-table\/\">create a new table<\/a> named <code>books2<\/code> that has the same structure as the <code>books<\/code> table:<\/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\">CREATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> books2 <span class=\"hljs-keyword\">LIKE<\/span> books;\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>Then, insert all rows from the <code>books<\/code> table to the <code>books2<\/code> table using the <code><a href=\"https:\/\/db2tutorial.com\/db2-basics\/db2-insert-into-select\/\">INSERT INTO SELECT<\/a><\/code> statement:<\/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\">INSERT<\/span> <span class=\"hljs-keyword\">INTO<\/span> books2 \n<span class=\"hljs-keyword\">SELECT<\/span> * <span class=\"hljs-keyword\">FROM<\/span> books;\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<h3 class=\"wp-block-heading\">1) Using Db2 TRUNCATE TABLE statement within a transaction example<\/h3>\n\n\n\n<p>First, start a new transaction:<\/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\">BEGIN<\/span> <span class=\"hljs-keyword\">TRANSACTION<\/span>;\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>Second, truncate the <code>book2<\/code> table:<\/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\">TRUNCATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> books2;\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>Third, rollback the transaction:<\/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\">ROLLBACK<\/span>;\n<\/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>Fourth, verify the truncate operation by querying some rows from the <code>books2<\/code> table:<\/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\ttitle\n<span class=\"hljs-keyword\">FROM<\/span>\n\tbooks2\n<span class=\"hljs-keyword\">ORDER<\/span> <span class=\"hljs-keyword\">BY<\/span> \n\ttitle\n<span class=\"hljs-keyword\">LIMIT<\/span> <span class=\"hljs-number\">5<\/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<p>Here is the output:<\/p>\n\n\n\n<p>As you can see clearly from the output, the truncate operation on the <code>books2<\/code> table was rolled back successfully.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2) Using Db2 TRUNCATE TABLE statement to truncate a table immediately<\/h3>\n\n\n\n<p>The following example uses the <code>TRUNCATE TABLE<\/code> statement to truncate the <code>books2<\/code> table immediately with the <code>IMMEDIATE<\/code> option:<\/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\">TRUNCATE<\/span> <span class=\"hljs-keyword\">TABLE<\/span> books2 \n<span class=\"hljs-keyword\">IMMEDIATE<\/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<p>If you query data from the <code>books2<\/code> table, you will get an empty result set:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-9\" 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> * <span class=\"hljs-keyword\">FROM<\/span> books2;\n<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><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 tutorial, you&#8217;ve learned how to use the Db2 statement to delete all data from 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 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