Troubleshooting an Oracle Server can be a complex process that requires a good understanding of Oracle Database and various tools available to diagnose and resolve issues. Here are some steps and commands that can help you troubleshoot an Oracle Server:<\/p>\n\n\n
Check the Oracle alert log file: The Oracle alert log file contains a record of all important events in the database. You can use<\/span> the<\/span> following<\/span> command<\/span> to<\/span> view<\/span> the<\/span> last<\/span> 50 lines<\/span> of<\/span> the<\/span> alert<\/span> log<\/span> file<\/span>:\r\n\r\n$ tail<\/span> -n<\/span> 50 $ORACLE_HOME<\/span>\/diag<\/span>\/rdbms<\/span>\/<database_name<\/span>>\/<SID<\/span>>\/trace<\/span>\/alert_<\/span><SID<\/span>>.log<\/span>\r\n\r\nCheck<\/span> the<\/span> Oracle<\/span> listener<\/span> log<\/span> file<\/span>: The<\/span> Oracle<\/span> listener<\/span> log<\/span> file<\/span> contains<\/span> information<\/span> about<\/span> client<\/span> connections<\/span> and<\/span> errors<\/span>. You<\/span> can<\/span> use<\/span> the<\/span> following<\/span> command<\/span> to<\/span> view<\/span> the<\/span> listener<\/span> log<\/span> file<\/span>:\r\n\r\n$ tail<\/span> -n<\/span> 50 $ORACLE_HOME<\/span>\/diag<\/span>\/tnslsnr<\/span>\/<hostname<\/span>>\/<listener_name<\/span>>\/trace<\/span>\/listener<\/span>.log<\/span>\r\n\r\nCheck<\/span> the<\/span> Oracle<\/span> database<\/span> alert<\/span> log<\/span> view<\/span>: You<\/span> can<\/span> use<\/span> the<\/span> following<\/span> SQL<\/span> command<\/span> to<\/span> view<\/span> the<\/span> database<\/span> alert<\/span> log<\/span> view<\/span>:\r\n\r\n$ select<\/span> * from<\/span> v<\/span>$diag_info<\/span> where<\/span> name<\/span>='Default<\/span> Trace<\/span> File<\/span>';\r\n\r\nCheck the Oracle database alert history: You can use<\/span> the<\/span> following<\/span> SQL<\/span> command<\/span> to<\/span> view<\/span> the<\/span> database<\/span> alert<\/span> history<\/span>:\r\n\r\n$ select<\/span> * from<\/span> dba_hist_alert_history<\/span> order<\/span> by<\/span> alert_timestamp<\/span> desc<\/span>;\r\n\r\nCheck the Oracle database sessions: You can use<\/span> the<\/span> following<\/span> SQL<\/span> command<\/span> to<\/span> view<\/span> the<\/span> database<\/span> sessions<\/span>:\r\n\r\n$ select<\/span> sid<\/span>, serial<\/span>#, username<\/span>, status<\/span>, machine<\/span>, program<\/span> from<\/span> v<\/span>$session<\/span>;\r\n\r\nCheck the Oracle database locks: You can use<\/span> the<\/span> following<\/span> SQL<\/span> command<\/span> to<\/span> view<\/span> the<\/span> database<\/span> locks<\/span>:\r\n\r\n$ select<\/span> * from<\/span> v<\/span>$lock<\/span>;\r\n\r\nCheck the Oracle database tablespaces: You can use<\/span> the<\/span> following<\/span> SQL<\/span> command<\/span> to<\/span> view<\/span> the<\/span> database<\/span> tablespaces<\/span>:\r\n\r\n$ select<\/span> * from<\/span> dba_tablespaces<\/span>;\r\n\r\nCheck the Oracle database data files: You can use<\/span> the<\/span> following<\/span> SQL<\/span> command<\/span> to<\/span> view<\/span> the<\/span> database<\/span> data<\/span> files<\/span>:\r\n\r\n$ select<\/span> * from<\/span> dba_data_files<\/span>;<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n<\/code><\/span><\/pre>","protected":false},"excerpt":{"rendered":"Troubleshooting an Oracle Server can be a complex process that requires a good understanding of Oracle Database and various tools available to diagnose and resolve issues. Here are some steps and commands that can help you troubleshoot an Oracle Server:<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_kad_post_classname":"","_joinchat":[],"footnotes":""},"categories":[2],"tags":[],"class_list":["post-33686","post","type-post","status-publish","format-standard","hentry","category-uncategorised"],"_links":{"self":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/33686","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/comments?post=33686"}],"version-history":[{"count":1,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/33686\/revisions"}],"predecessor-version":[{"id":33687,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/posts\/33686\/revisions\/33687"}],"wp:attachment":[{"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/media?parent=33686"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/categories?post=33686"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.devopsschool.com\/blog\/wp-json\/wp\/v2\/tags?post=33686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}