{"id":202655,"date":"2025-06-26T09:31:45","date_gmt":"2025-06-26T09:31:45","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/"},"modified":"2025-06-26T09:31:45","modified_gmt":"2025-06-26T09:31:45","slug":"how-to-check-undo_retention-value-in-oracle","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/","title":{"rendered":"How to check undo_retention value in Oracle?"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#How_to_check_undo_retention_value_in_Oracle\" title=\"How to check undo_retention value in Oracle?\">How to check undo_retention value in Oracle?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#What_is_the_default_value_of_undo_retention_in_Oracle\" title=\"What is the default value of undo_retention in Oracle?\">What is the default value of undo_retention in Oracle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#Can_the_undo_retention_value_be_changed_dynamically_in_Oracle\" title=\"Can the undo_retention value be changed dynamically in Oracle?\">Can the undo_retention value be changed dynamically in Oracle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#What_is_the_maximum_value_that_undo_retention_can_be_set_to_in_Oracle\" title=\"What is the maximum value that undo_retention can be set to in Oracle?\">What is the maximum value that undo_retention can be set to in Oracle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#Can_setting_a_high_undo_retention_value_impact_database_performance\" title=\"Can setting a high undo_retention value impact database performance?\">Can setting a high undo_retention value impact database performance?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#How_can_I_check_the_current_undo_retention_value_through_SQLPlus\" title=\"How can I check the current undo_retention value through SQL*Plus?\">How can I check the current undo_retention value through SQL*Plus?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#What_is_the_purpose_of_setting_a_specific_undo_retention_value_in_Oracle\" title=\"What is the purpose of setting a specific undo_retention value in Oracle?\">What is the purpose of setting a specific undo_retention value in Oracle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#What_happens_if_the_undo_tablespace_runs_out_of_space_due_to_a_high_undo_retention_value\" title=\"What happens if the undo tablespace runs out of space due to a high undo_retention value?\">What happens if the undo tablespace runs out of space due to a high undo_retention value?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#Is_there_a_way_to_monitor_the_usage_of_undo_space_in_Oracle\" title=\"Is there a way to monitor the usage of undo space in Oracle?\">Is there a way to monitor the usage of undo space in Oracle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#What_are_the_implications_of_setting_a_low_undo_retention_value_in_Oracle\" title=\"What are the implications of setting a low undo_retention value in Oracle?\">What are the implications of setting a low undo_retention value in Oracle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#Can_the_undo_retention_value_be_set_at_the_session_level_in_Oracle\" title=\"Can the undo_retention value be set at the session level in Oracle?\">Can the undo_retention value be set at the session level in Oracle?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#What_steps_should_be_taken_if_undo_retention_needs_to_be_adjusted_due_to_performance_issues\" title=\"What steps should be taken if undo_retention needs to be adjusted due to performance issues?\">What steps should be taken if undo_retention needs to be adjusted due to performance issues?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"How_to_check_undo_retention_value_in_Oracle\"><\/span>How to check undo_retention value in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In Oracle, the undo_retention parameter determines how long undo data is kept before being overwritten. To check the current undo_retention value, you can run the following SQL query:<\/p>\n<p>&#8220;`sql<br \/>\nSELECT value<br \/>\nFROM v$parameter<br \/>\nWHERE name = &#8216;undo_retention&#8217;;<br \/>\n&#8220;`<\/p>\n<p>This query will return the current undo_retention value in seconds.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_default_value_of_undo_retention_in_Oracle\"><\/span>What is the default value of undo_retention in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The default value of undo_retention in Oracle is 900 seconds (15 minutes).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_the_undo_retention_value_be_changed_dynamically_in_Oracle\"><\/span>Can the undo_retention value be changed dynamically in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes, you can change the undo_retention value dynamically using the following SQL command:<\/p>\n<p>&#8220;`sql<br \/>\nALTER SYSTEM SET undo_retention = <new_value> scope=both;<br \/>\n&#8220;`<\/p>\n<p>This will set the new undo_retention value for both the current and future sessions.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_maximum_value_that_undo_retention_can_be_set_to_in_Oracle\"><\/span>What is the maximum value that undo_retention can be set to in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The maximum value that undo_retention can be set to in Oracle is 1,073,741,824 seconds (about 31,536,000 seconds or 1 year).<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_setting_a_high_undo_retention_value_impact_database_performance\"><\/span>Can setting a high undo_retention value impact database performance?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Setting a very high undo_retention value can increase the amount of undo data stored in the Undo tablespace, which may impact database performance and storage space.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_can_I_check_the_current_undo_retention_value_through_SQLPlus\"><\/span>How can I check the current undo_retention value through SQL*Plus?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>You can also check the current undo_retention value through SQL*Plus by running the following command:<\/p>\n<p>&#8220;`sql<br \/>\nSHOW PARAMETER undo_retention;<br \/>\n&#8220;`<\/p>\n<p>This command will display the current undo_retention value set in the database.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_purpose_of_setting_a_specific_undo_retention_value_in_Oracle\"><\/span>What is the purpose of setting a specific undo_retention value in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Setting a specific undo_retention value allows you to control how long Oracle keeps undo data before overwriting it, which can be useful for ensuring data consistency and supporting long-running transactions.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_happens_if_the_undo_tablespace_runs_out_of_space_due_to_a_high_undo_retention_value\"><\/span>What happens if the undo tablespace runs out of space due to a high undo_retention value?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If the undo tablespace runs out of space due to a high undo_retention value, Oracle will begin overwriting the oldest undo data to make room for new undo data, potentially causing errors or data corruption in active transactions.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_there_a_way_to_monitor_the_usage_of_undo_space_in_Oracle\"><\/span>Is there a way to monitor the usage of undo space in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes, you can monitor the usage of undo space in Oracle by querying the v$undostat view, which provides information on undo space consumption, usage, and retention.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_are_the_implications_of_setting_a_low_undo_retention_value_in_Oracle\"><\/span>What are the implications of setting a low undo_retention value in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Setting a low undo_retention value may result in insufficient undo data retention for long-running transactions, potentially causing errors or inconsistencies in the database.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_the_undo_retention_value_be_set_at_the_session_level_in_Oracle\"><\/span>Can the undo_retention value be set at the session level in Oracle?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No, the undo_retention value can only be set at the system level in Oracle using the ALTER SYSTEM command.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_steps_should_be_taken_if_undo_retention_needs_to_be_adjusted_due_to_performance_issues\"><\/span>What steps should be taken if undo_retention needs to be adjusted due to performance issues?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If adjusting the undo_retention value is necessary to address performance issues, it is recommended to monitor the impact on database performance and storage usage before making any permanent changes.<\/p>\n<p>By following these best practices and guidelines, you can effectively manage and optimize the undo_retention value in Oracle to meet the specific needs and requirements of your database environment.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to check undo_retention value in Oracle? In Oracle, the undo_retention parameter determines how long undo data is kept before being overwritten. To check the current undo_retention value, you can run the following SQL query: &#8220;`sql SELECT value FROM v$parameter WHERE name = &#8216;undo_retention&#8217;; &#8220;` This query will return the current undo_retention value in seconds. &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to check undo_retention value in Oracle?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/how-to-check-undo_retention-value-in-oracle\/#more-202655\">Read more<span class=\"screen-reader-text\">How to check undo_retention value in Oracle?<\/span><\/a><\/p>\n","protected":false},"author":51,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-202655","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to check undo_retention value in Oracle?<\/title>\n<meta name=\"description\" content=\"How to check undo_retention value in Oracle? 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In Oracle, the undo_retention parameter determines how long undo data is kept before being overwritten. 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