{"id":14556,"date":"2020-01-03T06:25:54","date_gmt":"2020-01-03T06:25:54","guid":{"rendered":"https:\/\/dbtut.com\/?p=14556"},"modified":"2020-01-03T06:25:56","modified_gmt":"2020-01-03T06:25:56","slug":"what-is-archivelog-mode-in-oracle-and-how-do-i-enable-and-disable-archivelog-mode","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2020\/01\/03\/what-is-archivelog-mode-in-oracle-and-how-do-i-enable-and-disable-archivelog-mode\/","title":{"rendered":"What is Archivelog Mode in Oracle and How Do I Enable and Disable Archivelog Mode"},"content":{"rendered":"<h2>What is Archivelog Mode in Oracle?<\/h2>\n<p>The following operations cannot be performed until archive log mode is enabled.<\/p>\n<ul>\n<li>RMAN Online Backup<\/li>\n<li>Flashback Database<\/li>\n<li>User Managed Hot Backup<\/li>\n<\/ul>\n<p>ARCHIVE LOG MODE must be enabled to perform the above operations.<\/p>\n<p>There are some situations in the database that must be considered before enabling archivelog mode. These are as follows;<\/p>\n<ul>\n<li>The size of the disk on which our Archive Logs will be stored should be determined and disk space allocated accordingly. This is an important issue since archive log files take up space on the disk.<\/li>\n<li>How long we will store our archive logs is another important issue.<\/li>\n<li>It is necessary to decide whether the archive log files will be stored on a single directory or on multiple disks.<\/li>\n<li>We need to determine the format of our archive logs. Thus, it will be easier to differentiate from other database files.<\/li>\n<\/ul>\n<p>There must be some configurations on the database before enabling archive mode. Like determining where to save archive log files.<\/p>\n<ol>\n<li><strong>LOG_ARCHIVE_DEST_N<\/strong><\/li>\n<li><strong>FRA Usage<\/strong><\/li>\n<\/ol>\n<h3>1) Locating Archive Log Files(LOG_ARCHIVE_DEST_N)<\/h3>\n<p>We can set the location of archive log files with LOG_ARCHIVE_DEST_N parameter.<\/p>\n<pre class=\"lang:default decode:true \">SQL&gt; alter system set log_archive_dest_1 = 'location=\/\u2026\u2026 ' scope = both;<\/pre>\n<p>We also need to set the format of the archive logs. By default, Archive Logs are saved with a .dbf extension, but this makes it difficult to differentiate archive logs from data files. Therefore, we can define the desired format with LOG_ARCHIVE_FORMAT parameter.<\/p>\n<pre class=\"lang:default decode:true\">SQL&gt; alter system set log_archive_format='SINGLEDB_%t_%s_%r.arc' scope=both;<\/pre>\n<p>The meaning of the characters used to determine the format of the archive log files;<\/p>\n<p>%s\u00a0 -&gt;\u00a0 log sequence number<\/p>\n<p>%S\u00a0 -&gt;\u00a0 log sequence number, zero filled<\/p>\n<p>%t\u00a0 -&gt;\u00a0 thread number<\/p>\n<p>%T -&gt;\u00a0 thread number, zero filled<\/p>\n<p>%a\u00a0 -&gt;\u00a0 activation ID<\/p>\n<p>%d\u00a0 -&gt;\u00a0 Database ID<\/p>\n<p>%r\u00a0 -&gt;\u00a0 Resetlod ID<\/p>\n<div style=\"direction: ltr;\"><strong>Oracle default format;<\/strong> %t_%s_%r.dbf<\/div>\n<div>\n<pre class=\"lang:default decode:true \">SQL&gt; show parameter db_recovery\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\ndb_recovery_file_dest                string\ndb_recovery_file_dest_size           big integer 0\n\t\nSQL&gt; archive log list\nDatabase log mode              No Archive Mode\nAutomatic archival             Disabled\nArchive destination            \/u01\/app\/oracle\/product\/11.2.0\/db_1\/dbs\/arch\nOldest online log sequence     14\nCurrent log sequence           16\n<\/pre>\n<h3>2) FRA(Fast Recovery Area) Usage<\/h3>\n<\/div>\n<h4>What is Fast Recovery Area?<\/h4>\n<p>FRA is an area where the following files are stored;<\/p>\n<ul>\n<li>Archive log files,<\/li>\n<li>RMAN backup files,<\/li>\n<li>Flashback log files,<\/li>\n<li>Online Redo Log files,<\/li>\n<li>Control File<\/li>\n<\/ul>\n<p>Use of the FRA area can be enabled by setting two parameters in the database. These parameters are; DB_RECOVERY_FILE_DEST and DB_RECOVERY_FILE_DEST_SIZE.<\/p>\n<p><strong>DB_RECOVERY_FILE_DEST<\/strong> determines the directory to use as the FRA area.<\/p>\n<p><strong>DB_RECOVERY_FILE_DEST_SIZE<\/strong> determines the maximum space for files in the FRA area.<\/p>\n<h4>Before Enabling Fast Recovery Area<\/h4>\n<pre class=\"lang:default decode:true \">SQL&gt; show parameter db_recovery\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\ndb_recovery_file_dest                string\ndb_recovery_file_dest_size           big integer 0\n\n\nSQL&gt; archive log list\nDatabase log mode              No Archive Mode\nAutomatic archival             Disabled\nArchive destination            \/u01\/app\/oracle\/product\/11.2.0\/db_1\/dbs\/arch\nOldest online log sequence     14\nCurrent log sequence           16<\/pre>\n<h4>Enable Fast Recovery Area<\/h4>\n<p>The following operations are performed consequentively. If the order changes, you receive an error.<\/p>\n<pre class=\"lang:default decode:true \">SQL&gt; alter system set db_recovery_file_dest_size=20000M;\n\nSystem altered.\n\nSQL&gt; alter system set db_recovery_file_dest='+FRA';\n\nSystem altered.<\/pre>\n<p>Now, check the db_recovery parameter again;<\/p>\n<pre class=\"lang:default decode:true \">SQL&gt; show parameter db_recovery\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\ndb_recovery_file_dest                string      +FRA\ndb_recovery_file_dest_size           big integer 10000M\n\n\nSQL&gt; archive log list\nDatabase log mode              No Archive Mode\nAutomatic archival             Disabled\nArchive destination            USE_DB_RECOVERY_FILE_DEST\nOldest online log sequence     14\nCurrent log sequence           16<\/pre>\n<h4>DB_RECOVERY_FILE_DEST\u00a0 vs LOG_ARCHIVE_DEST<\/h4>\n<p>If the parameter LOG_ARCHIVE_DEST_N is set together with the FRA area in the PARAMETER file in the database, the archive log files are saved to the directory set in the LOG_ARCHIVE_DEST_N parameter, not the FRA area. These situations can be queried as follows.<\/p>\n<pre class=\"lang:default decode:true \">SQL&gt; show parameter log_archive_dest_1\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\nlog_archive_dest_1                   string\n\nSQL&gt; show parameter db_recovery\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\ndb_recovery_file_dest                string      +FRA\ndb_recovery_file_dest_size           big integer 10000M\n\nSQL&gt; show parameter log_archive_format\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\nlog_archive_format                   string      %t_%s_%r.dbf<\/pre>\n<p>When the first file is created in the FRA area, Oracle creates a set of logical directories on the file location specified by the db_recovery_file_dest parameter. Its structure is as follows;<br \/>\ndb_recovery_file_dest\/Oracle_SID\/archivelog\/[YYYY_MM_DD]\n<p>According to the above directory structure, a new directory is created every day and archive files are saved to these locations.<\/p>\n<p>Oracle recommends the use of FRA space for RMAN backup files and Archive Log Files. FRA area management is performed by Oracle. Backup files and archive files are stored on the same disk.<\/p>\n<p>When a very high level of REDO occurs, if there is no space in the FRA area; If a new REDO Log Switch operation occurs, the database will become unresponsive as there will be no more disk space.<\/p>\n<p>Therefore, FRA is not a preferred area of \u200b\u200buse in production databases. Instead, it is necessary to specify a space by setting LOG_ARCHIVE_DEST_N and keep it under control with SCRIPT.<\/p>\n<h4>Find Archivelog Location<\/h4>\n<p>You can check the Archivelog file location as follows;<\/p>\n<pre class=\"lang:default decode:true \">SQL&gt; archive log list;    (If FRA Used)\nDatabase log mode                   No Archive Mode\nAutomatic archival                    Disabled\nArchive destination                   USE_DB_RECOVERY_FILE_DEST\nOldest online log sequence     19\nCurrent log sequence               21\n\n\n\nSQL&gt; archive log list;    (If FRA Not Used)\nDatabase log mode                   No Archive Mode\nAutomatic archival                    Disabled\nArchive destination                  \/oracle\/ora11g\/dbs\/arch\nOldest online log sequence     7247\nCurrent log sequence               7249<\/pre>\n<h4>Check Archivelog Size<\/h4>\n<pre class=\"lang:default decode:true \">SQL&gt; show parameter db_recovery_file_dest;\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\ndb_recovery_file_dest                string      +FRA\ndb_recovery_file_dest_size           big integer 10G<\/pre>\n<h4>Check Archivelog Parameters<\/h4>\n<pre class=\"lang:default decode:true \">SQL&gt; show parameter log\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\naudit_syslog_level                   string\ncommit_logging                       string\ndb_create_online_log_dest_1          string\ndb_create_online_log_dest_2          string\ndb_create_online_log_dest_3          string\ndb_create_online_log_dest_4          string\ndb_create_online_log_dest_5          string\nenable_ddl_logging                   boolean     FALSE\nlog_archive_config                   string\nlog_archive_dest                     string\nlog_archive_dest_1                   string\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\nlog_archive_dest_10                  string\nlog_archive_dest_11                  string\nlog_archive_dest_12                  string\nlog_archive_dest_13                  string\nlog_archive_dest_14                  string\nlog_archive_dest_15                  string\nlog_archive_dest_16                  string\nlog_archive_dest_17                  string\nlog_archive_dest_18                  string\nlog_archive_dest_19                  string\nlog_archive_dest_2                   string\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\nlog_archive_dest_20                  string\nlog_archive_dest_21                  string\nlog_archive_dest_22                  string\nlog_archive_dest_23                  string\nlog_archive_dest_24                  string\nlog_archive_dest_25                  string\nlog_archive_dest_26                  string\nlog_archive_dest_27                  string\nlog_archive_dest_28                  string\nlog_archive_dest_29                  string\nlog_archive_dest_3                   string\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\nlog_archive_dest_30                  string\nlog_archive_dest_31                  string\nlog_archive_dest_4                   string\nlog_archive_dest_5                   string\nlog_archive_dest_6                   string\nlog_archive_dest_7                   string\nlog_archive_dest_8                   string\nlog_archive_dest_9                   string\nlog_archive_dest_state_1             string      enable\nlog_archive_dest_state_10            string      enable\nlog_archive_dest_state_11            string      enable\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\nlog_archive_dest_state_12            string      enable\nlog_archive_dest_state_13            string      enable\nlog_archive_dest_state_14            string      enable\nlog_archive_dest_state_15            string      enable\nlog_archive_dest_state_16            string      enable\nlog_archive_dest_state_17            string      enable\nlog_archive_dest_state_18            string      enable\nlog_archive_dest_state_19            string      enable\nlog_archive_dest_state_2             string      enable\nlog_archive_dest_state_20            string      enable\nlog_archive_dest_state_21            string      enable\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\nlog_archive_dest_state_22            string      enable\nlog_archive_dest_state_23            string      enable\nlog_archive_dest_state_24            string      enable\nlog_archive_dest_state_25            string      enable\nlog_archive_dest_state_26            string      enable\nlog_archive_dest_state_27            string      enable\nlog_archive_dest_state_28            string      enable\nlog_archive_dest_state_29            string      enable\nlog_archive_dest_state_3             string      enable\nlog_archive_dest_state_30            string      enable\nlog_archive_dest_state_31            string      enable\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\nlog_archive_dest_state_4             string      enable\nlog_archive_dest_state_5             string      enable\nlog_archive_dest_state_6             string      enable\nlog_archive_dest_state_7             string      enable\nlog_archive_dest_state_8             string      enable\nlog_archive_dest_state_9             string      enable\nlog_archive_duplex_dest              string\nlog_archive_format                   string      RMANASM_%t_%s_%r.arc\nlog_archive_local_first              boolean     TRUE\nlog_archive_max_processes            integer     4\nlog_archive_min_succeed_dest         integer     1\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\nlog_archive_start                    boolean     FALSE\nlog_archive_trace                    integer     0\nlog_buffer                           integer     6815744\nlog_checkpoint_interval              integer     0\nlog_checkpoint_timeout               integer     1800\nlog_checkpoints_to_alert             boolean     FALSE\nlog_file_name_convert                string\n<\/pre>\n<h4>Check Archivelog Format<\/h4>\n<pre class=\"lang:default decode:true \">SQL&gt; show parameter log_archive_format\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\nlog_archive_format                   string      RMANASM_%t_%s_%r.arc<\/pre>\n<h2>How To Enable Archivelog Mode in Oracle?<\/h2>\n<h4>Determine where the database archive log files will be stored(for FRA);<\/h4>\n<pre class=\"lang:default decode:true  \">SQL&gt; alter system set db_recovery_file_dest_size=10G scope=both;\nSQL&gt; alter system set db_recovery_file_dest='+FRA' scope=both;<\/pre>\n<h4>Determine where the database archive log files will be stored(File System Location);<\/h4>\n<pre class=\"lang:default decode:true \">SQL&gt; alter system set log_archive_dest_1 = 'location=\/\u2026\u2026 ' scope = both;<\/pre>\n<p>If you set both of above parameters, the archive log files are saved to the directory set in the LOG_ARCHIVE_DEST_N parameter, not the FRA area. You can find the detail informartion above.<\/p>\n<h4>Set Archive Log Files Format;<\/h4>\n<pre class=\"lang:default decode:true\">SQL&gt; alter system set log_archive_format='singledb_%t_%s_%r.arc' scope=spfile;\nSystem altered.\n\nSQL&gt; shutdown immediate;\nDatabase closed.\nDatabase dismounted.\nORACLE instance shut down.\n\n\nSQL&gt; startup;\nORACLE instance started.\n\nTotal System Global Area 3323752448 bytes\nFixed Size                  2217912 bytes\nVariable Size            1811941448 bytes\nDatabase Buffers         1493172224 bytes\nRedo Buffers               16420864 bytes\nDatabase mounted.\nDatabase opened.\n\n\nSQL&gt; show parameter log_archive_format\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\nlog_archive_format                   string      singledb_%t_%s_%r.arc<\/pre>\n<h4>Check Archivelog File Location;<\/h4>\n<pre class=\"lang:default decode:true \">SQL&gt; archive log list;    (FRA alan\u0131 kullan\u0131lm\u0131\u015fsa)\nDatabase log mode                   No Archive Mode\nAutomatic archival                    Disabled\nArchive destination                   USE_DB_RECOVERY_FILE_DEST\nOldest online log sequence     19\nCurrent log sequence               21\n\n\n\nSQL&gt; archive log list;    (FRA alan\u0131 kullan\u0131lmam\u0131\u015fsa)\nDatabase log mode                   No Archive Mode\nAutomatic archival                    Disabled\nArchive destination                  \/oracle\/ora11g\/dbs\/arch\nOldest online log sequence     7247\nCurrent log sequence               7249\n\n\n\nSQL&gt; show parameter db_recovery_file_dest;\n\nNAME                                 TYPE        VALUE\n------------------------------------ ----------- ------------------------------\ndb_recovery_file_dest                string      +FRA\ndb_recovery_file_dest_size           big integer 10G<\/pre>\n<h4>Enable Archivelog Mode<\/h4>\n<pre class=\"lang:default decode:true \">SQL&gt; shutdown immediate;\nDatabase closed.\nDatabase dismounted.\nORACLE instance shut down.\n\nSQL&gt; startup mount;\nORACLE instance started.\n\nTotal System Global Area 1653518336 bytes\nFixed Size                  2213896 bytes\nVariable Size            1006635000 bytes\nDatabase Buffers          637534208 bytes\nRedo Buffers                7135232 bytes\nDatabase mounted.\n\nSQL&gt; alter database archivelog;\n\nDatabase altered.\n\n\nSQL&gt; alter database open;\n\nDatabase altered.\nSQL&gt; select log_mode from v$database;\n\nLOG_MODE\n------------\nARCHIVELOG\n\nSQL&gt;<\/pre>\n<h4>Disabling Archivelog Mode<\/h4>\n<pre class=\"lang:default decode:true\">SQL&gt; shutdown immediate;\nDatabase closed.\nDatabase dismounted.\nORACLE instance shut down.\n\nSQL&gt; startup mount;\nORACLE instance started.\n\nTotal System Global Area 1653518336 bytes\nFixed Size                  2213896 bytes\nVariable Size            1006635000 bytes\nDatabase Buffers          637534208 bytes\nRedo Buffers                7135232 bytes\nDatabase mounted.\n\nSQL&gt; alter database noarchivelog;\n\nDatabase altered.\n\n\nSQL&gt; alter database open;\n\nDatabase altered.\n\n\nSQL&gt; select log_mode from v$database;\n\nLOG_MODE\n------------\nNOARCHIVELOG\n\nSQL&gt;<\/pre>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_14556\" class=\"pvc_stats all  \" data-element-id=\"14556\" 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>What is Archivelog Mode in Oracle? The following operations cannot be performed until archive log mode is enabled. RMAN Online Backup Flashback Database User Managed Hot Backup ARCHIVE LOG MODE must be enabled to perform the above operations. There are some situations in the database that must be considered before enabling archivelog mode. These are &hellip;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_14556\" class=\"pvc_stats all  \" data-element-id=\"14556\" 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 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