{"id":3738,"date":"2025-05-29T17:52:38","date_gmt":"2025-05-29T17:52:38","guid":{"rendered":"https:\/\/w3buddy.com\/?post_type=cposts&#038;p=3738"},"modified":"2025-05-29T17:52:39","modified_gmt":"2025-05-29T17:52:39","slug":"archiver-process-arcn","status":"publish","type":"cposts","link":"https:\/\/w3buddy.com\/blog\/notes\/getting-started-with-oracle-dba\/archiver-process-arcn\/","title":{"rendered":"Archiver Process (ARCn)"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Preserving Your Redo Logs for Recovery \ud83d\udcda<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83e\uddfe What Is ARCn?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Archiver processes (ARCn)<\/strong> run only when the database is in <strong>ARCHIVELOG mode<\/strong> with <strong>automatic archiving enabled<\/strong>. Their job is to <strong>archive online redo log files<\/strong> to ensure that redo logs are safely saved before being reused.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udee0\ufe0f What Does ARCn Do?<\/h3>\n\n\n\n<figure class=\"wp-block-table has-small-font-size\"><table><thead><tr><th>\ud83d\udd27 <strong>Function<\/strong><\/th><th>\ud83d\udccc <strong>Details<\/strong><\/th><\/tr><\/thead><tbody><tr><td>\ud83d\udce5 <strong>Archive Online Logs<\/strong><\/td><td>ARCn archives <strong>filled online redo log files<\/strong> so LGWR can overwrite them safely.<\/td><\/tr><tr><td>\ud83e\uddd1\u200d\ud83e\udd1d\u200d\ud83e\uddd1 <strong>Multiple Processes<\/strong><\/td><td>Multiple ARCn processes (ARC0\u2013ARC9 and ARCa\u2013ARCt) may run concurrently to keep up with archiving load.<\/td><\/tr><tr><td>\u2699\ufe0f <strong>Configurable Count<\/strong><\/td><td>The <code>LOG_ARCHIVE_MAX_PROCESSES<\/code> parameter controls how many ARCn processes start initially.<\/td><\/tr><tr><td>\ud83c\udf10 <strong>Multiple Destinations<\/strong><\/td><td>Supports <strong>multiple archive log destinations<\/strong>; Oracle recommends one ARCn process per destination.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83e\udde9 Additional Notes<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ARCn runs as either a <strong>thread or OS process<\/strong>, based on system configuration.<\/li>\n\n\n\n<li>Can have <strong>up to 31 archive destinations<\/strong>, with corresponding ARCn processes.<\/li>\n\n\n\n<li>Increasing the number of ARCn processes helps during <strong>heavy workloads<\/strong>, like bulk data loads.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">\ud83d\udd12 Why ARCn Matters<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Prevents <strong>redo log overwrites<\/strong> until logs are safely archived.<\/li>\n\n\n\n<li>Essential for <strong>point-in-time recovery<\/strong> and backup consistency.<\/li>\n\n\n\n<li>Supports <strong>high availability and disaster recovery<\/strong> by maintaining archived redo logs.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\ud83d\udcd8 <em>Tip of the Day:<\/em><br>Check archive log status using views like <code>V$ARCHIVED_LOG<\/code> and monitor ARCn processes with <code>V$PROCESS<\/code> to ensure archiving keeps pace with your workload.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Preserving Your Redo Logs for Recovery \ud83d\udcda \ud83e\uddfe What Is ARCn? Archiver processes (ARCn) run only when the database is in ARCHIVELOG mode with automatic archiving enabled. Their job is to archive online redo log files to ensure that redo logs are safely saved before being reused. \ud83d\udee0\ufe0f What Does ARCn Do? \ud83d\udd27 Function \ud83d\udccc [&hellip;]<\/p>\n","protected":false},"template":"","meta":{"googlesitekit_rrm_CAowu461DA:productID":""},"categories":[960,952],"class_list":["post-3738","cposts","type-cposts","status-publish","hentry","category-getting-started-with-oracle-dba","category-notes"],"_links":{"self":[{"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/cposts\/3738","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/cposts"}],"about":[{"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/types\/cposts"}],"wp:attachment":[{"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/media?parent=3738"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/w3buddy.com\/blog\/wp-json\/wp\/v2\/categories?post=3738"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}