{"id":18865,"date":"2021-03-15T11:23:54","date_gmt":"2021-03-15T11:23:54","guid":{"rendered":"https:\/\/dbtut.com\/?p=18865"},"modified":"2021-03-15T11:24:31","modified_gmt":"2021-03-15T11:24:31","slug":"oracle-rac-node-eviction","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2021\/03\/15\/oracle-rac-node-eviction\/","title":{"rendered":"Oracle Rac Node Eviction"},"content":{"rendered":"<p>In today&#8217;s article, we will cover the subject of &#8220;oracle rac node eviction&#8221;, which is perhaps one of the last thing a database administrator wants to see.<\/p>\n<h3>What is node eviction in Oracle Rac?<\/h3>\n<p>Eviction is a mechanism \/ process technology designed for Oracle Cluster. This technology separates the Nodes in the cluster, with or without critical problems, from the structure in order not to disturb the consistency and general cluster operation.<\/p>\n<p>For example, if any node hangs on a cluster or thinks that it cannot be accessed for different reasons, Eviction will detach itself from the cluster structure and a quick reboot will occur for this node that appears to be problematic.<\/p>\n<p>This process is registered by LMON with the error &#8220;ORA-29740 evicted by instance number&#8221;.<\/p>\n<p>Its Main Causes are as follows and can be updated according to different cases.<\/p>\n<ul>\n<li>Network problems<\/li>\n<li>Memory (ram, swap, etc.) problems<\/li>\n<li>Excessive and prolonged load on the processor<\/li>\n<li>Bug 16876500 &amp; Bug 14385860<\/li>\n<\/ul>\n<p id=\"ChAsrUO\"><img loading=\"lazy\" decoding=\"async\" width=\"695\" height=\"516\" class=\"size-full wp-image-18866 aligncenter\" src=\"https:\/\/dbtut.com\/wp-content\/uploads\/2021\/03\/img_604f4061ba790.png\" alt=\"\" \/><\/p>\n<h3>How To Resolve Node Eviction in Oracle Rac?<\/h3>\n<p>Records to look for to fix the problem:<\/p>\n<ul>\n<li>All instance Alert Log records (cluster alert.log, asm alert.log)<\/li>\n<li>Ocssd.logs history<\/li>\n<li>History of LMON, LMSn, LMD0<\/li>\n<li>OSWatcher logs<\/li>\n<li>Operating system logs (\/var\/log\/messages)<\/li>\n<\/ul>\n<p>To explain the subject a little more, when a communication error occurs between the Nodes due to the network or when the Node to be subjected to the inviction process cannot write heartbeat information on the CFVRR, the Cluster on the node performs the eviction process mentioned above in order to prevent possible data corruption. IMR is responsible for the automation of all these processes.<\/p>\n<p>Instance Membership Recovery (IMR) is responsible for the organization of all cluster members and is also part of the Cluster Group Services structure.<\/p>\n<p>As we mentioned at first, this process results with the restart of the node where the problem is perceived.<\/p>\n<p>Hope to see you again,<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_18865\" class=\"pvc_stats all  \" data-element-id=\"18865\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"excerpt":{"rendered":"<p>In today&#8217;s article, we will cover the subject of &#8220;oracle rac node eviction&#8221;, which is perhaps one of the last thing a database administrator wants to see. What is node eviction in Oracle Rac? Eviction is a mechanism \/ process technology designed for Oracle Cluster. This technology separates the Nodes in the cluster, with or &hellip;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_18865\" class=\"pvc_stats all  \" data-element-id=\"18865\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/dbtut.com\/wp-content\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div class=\"pvc_clear\"><\/div>\n","protected":false},"author":574,"featured_media":18867,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[4],"tags":[10396,10394,10395],"class_list":["post-18865","post","type-post","status-publish","format-standard","has-post-thumbnail","","category-oracle","tag-how-to-resolve-node-eviction-in-oracle-rac","tag-oracle-rac-node-eviction","tag-what-is-node-eviction-in-oracle-rac"],"aioseo_notices":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - 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