{"id":2974,"date":"2013-10-03T02:12:00","date_gmt":"2013-10-03T00:12:00","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/oracle-database-12c-acfs-un-systeme-de-fichier-pour-vos-bases\/"},"modified":"2013-10-03T02:12:00","modified_gmt":"2013-10-03T00:12:00","slug":"oracle-database-12c-acfs-un-systeme-de-fichier-pour-vos-bases","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/oracle-database-12c-acfs-un-systeme-de-fichier-pour-vos-bases\/","title":{"rendered":"Oracle Database 12c:  ACFS &#8211; un syst\u00e8me de fichier pour vos bases"},"content":{"rendered":"<p><img decoding=\"async\" class=\"blog-image aligncenter\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/2e1ax_default_entry_Oracle_12c_Plug.jpg\" alt=\"\" \/><\/p>\n<p>La version 12c d&#8217;Oracle Grid Infrastructure introduit de nombreuses nouveaut\u00e9s dans le support d&#8217;ACFS, le syst\u00e8me de fichiers clusteris\u00e9s d&#8217;Oracle.\u00a0Nous\u00a0abordons dans ce posting la capacit\u00e9 d&#8217;ACFS d&#8217;\u00eatre le syst\u00e8me de fichier de votre base de donn\u00e9es ainsi que sa capacit\u00e9 de mise en \u0153uvre des snapshots.<\/p>\n<h3>Rappel sur ACFS<\/h3>\n<p>Ce syst\u00e8me de fichier est apparu avec la version 11.2 du cluster Oracle. Il s&#8217;appuie sur ASM ainsi qu&#8217;ADVM pour ASM Dynamic Volume Manager. Il est disponible dans la version cluster et\u00a0serveur autonome (Oracle restart)\u00a0de Grid Infrastructure pour Linux et Windows. Il permet de stocker toutes sortes de fichiers mais pas ceux d&#8217;une\u00a0base de donn\u00e9es.<\/p>\n<p>Chaque version interm\u00e9diaire de 11gR2 a mis en \u0153uvre de nouvelles fonctionnalit\u00e9s d&#8217;ACFS:<\/p>\n<ul>\n<li>ACFS snapshot<\/li>\n<li>ACFS security<\/li>\n<li>ACFS Encryption<\/li>\n<li>ACFS replication<\/li>\n<li>ACFS Tagging<\/li>\n<\/ul>\n<h3>Quoi de neuf\u00a0avec\u00a0ACFS Oracle 12c?<\/h3>\n<p>Il y a des am\u00e9liorations pour toutes les fonctions qui font passer le nombre d&#8217;options de la commande acfsutil de 360 \u00e0 plus de 450, ainsi qu&#8217;un\u00a0portage d&#8217;ACFS sur AIX\u00a0et Solaris.<\/p>\n<p>Notons aussi l&#8217;extension du support aux fichiers de base de donn\u00e9es &#8211; sans pr\u00e9cision sur le comportement dans le cadre d&#8217;un cluster.<\/p>\n<h3>Pourquoi ACFS pour votre database?<\/h3>\n<p>Il y a plusieurs avantages \u00e0 utiliser les datafiles d&#8217;une base sur\u00a0un syst\u00e8me de fichier plut\u00f4t que dans\u00a0ASM, mais un avantage me semble plus important que les autres: la capacit\u00e9\u00a0de mise\u00a0en \u0153uvre des snapshots d&#8217;ACFS.<\/p>\n<p>Instancier une base sur un systeme de fichier ACFS est strictement identique \u00e0 la mise en oeuvre sur ext2, ext3, etc.<br \/>\nNous avons par defaut disk_asynch_io = TRUE et filesystemio_options = NONE &#8211; comme pour une instance utilisant ASM.<\/p>\n<p><strong>Rappel<\/strong>: Oracle controle l&#8217;acc\u00e9s aux disques au travers des deux param\u00e8tres ci-dessus, la note ID\u00a0 751463.1 explique le comportement de ceux-ci dans le cas d&#8217;utilisation d&#8217;ASM. Les I\/O sont asynchrones<\/p>\n<h3>Snapshots ACFS<\/h3>\n<p>En version 11.2.0.2, il y avait 2 options possibles:<\/p>\n<ol>\n<li>snap create snapname mount_point<\/li>\n<li>snap delete snapname mount_point<\/li>\n<\/ol>\n<p>En version 12.1, nous avons\u00a0maintenant 16\u00a0options possibles. Celles-ci nous permettent de cr\u00e9er,\u00a0modifier, supprimer et connaitre l&#8217;\u00e9tat d&#8217;un snapshot.<\/p>\n<p>Nous allons ici utiliser que trois de ces commandes pour tester un backup et le restore d&#8217;une base.<\/p>\n<ol>\n<li>snap create<\/li>\n<li>snap info<\/li>\n<li>snap delete<\/li>\n<\/ol>\n<h3>Mise en oeuvre d&#8217;un backup par snapshot<\/h3>\n<p>Un snapshot sur une base ouverte n&#8217;a de sens que si celle-ci est en archivelog. Donc, tout d&#8217;abord, passons\u00a0la base en mode archive:<\/p>\n<h4>Activation de l&#8217;archivage:<\/h4>\n<p><strong>\u00a0<\/strong><\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">startup mount\nalter system set log_archive_dest_1='LOCATION=USE_DB_RECOVERY_FILE_DEST';\nalter database archivelog ;\nalter database open ;\narchive log list ;\nalter system switch logfile;<\/pre>\n<p>Pour que l&#8217;on puisse executer la cr\u00e9ation du snapshot depuis la base Oracle, il faut param\u00e9trer la commande sudo pour une utilisation transparente de afcsutil.<br \/>\nLa commande de backup par snapshot sera alors l&#8217;encha\u00eenement d&#8217;une mise en mode backup de la base, suivi de la cr\u00e9ation d&#8217;un snapshot:<\/p>\n<h4>Cr\u00e9ation d&#8217;un snapshot:<\/h4>\n<p>&nbsp;<\/p>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">--\n-- tache de backup par snapshot d'une base \n--\nalter database begin backup ;\n! sudo acfsutil snap create last-bkp-acfsdb \/u03\nalter database end backup;\n--\n-- list des snapshots \n! sudo acfsutil snap info \/u03\n--\n-- end backup\n--\nexit<\/pre>\n<h4>R\u00e9sultat de l&#8217;\u00e9xecution:<\/h4>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">Oracle Database 12c Enterprise Edition Release 12.1.0.0.2 - 64bit Beta\nWith the Partitioning, OLAP, Data Mining and Real Application Testing options\nDatabase altered.acfsutil snap create: Snapshot operation is complete.\nDatabase altered.snapshot name:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 last-bkp-acfsdb\nRO snapshot or RW snapshot:\u00a0 RO\nparent name:\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 \/u03\nsnapshot creation time:\u00a0\u00a0\u00a0\u00a0\u00a0 Fri Sep 28 17:22:26 2012\u00a0\u00a0\u00a0 number of snapshots:\u00a0 1\n\u00a0\u00a0\u00a0 snapshot space usage: 60030976<\/pre>\n<p>La cr\u00e9ation du snapshot est instantan\u00e9e, mais cela ne nous pr\u00e9serve pas d&#8217;une perte du\u00a0disque.<br \/>\nIl faut dans une deuxieme \u00e9tape recopier le snapshot sur un autre filesystem ou une autre machine. Dans notre exemple, nous proc\u00e9dons par la commande tar.<br \/>\nUne fois le snapshot pr\u00e9serv\u00e9, on le supprime sur le filesystem de la base:<\/p>\n<h4>Copy du snapshot et suppression:<\/h4>\n<pre class=\"brush: actionscript3; gutter: true; first-line: 1\">#\n# copy du snapshot vers un autre disque ..\n## copy des fichiers ou tar.\ncd \/u03\/.ACFS\/snaps\/last-bkp-acfsdbtar czvf \/u00\/app\/oracle\/admin\/acfsdb\/backup\/last-bkp-acfsdb-data.tar.gz oradata \ntar czvf \/u00\/app\/oracle\/admin\/acfsdb\/backup\/last-bkp-acfsdb-FRA.tar.gz fast_recovery_area \n#\ncd \/u00\/app\/oracle\/admin\/acfsdb\/backup\n#-\n# creation d'un repertoire avec la date \n#\ntag=\"bck-`date +%Y%m%d_%H%M%S`\"\nmkdir $tag\nmv last-bkp-acfsdb-*.tar.gz $tag\n#\n#- suppression du snapshot\n#-\nsudo acfsutil snap delete last-bkp-acfsdb \/u03\n#<\/pre>\n<h4>Test de restoration:<\/h4>\n<p>On &#8220;crash&#8221; la base en supprimant\u00a0un fichier: rm \/u03\/oradata\/acfsdb\/testtbs01.dbf<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">SQL&gt; select count(*) from testtbs1;\nselect count(*) from testtbs1\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 *\nERROR at line 1:\nORA-01116: error in opening database file 5\nORA-01110: data file 5: '\/u03\/oradata\/acfsdb\/testtbs01.dbf'\nORA-27041: unable to open file\nLinux-x86_64 Error: 2: No such file or directory\nAdditional information: 3SQL&gt; shutdown abort;\nORACLE instance shut down.\nSQL&gt; exit<\/pre>\n<p>La base \u00e9tant inaccessible on organise un restore des fichiers de la base &#8211; sans \u00e9craser les redolog files et les control files.<\/p>\n<h4>Commandes:<\/h4>\n<p>D&#8217;abord on renome les fichiers redolog et controlfile. On recopie \u00e0 partir du tar les fichiers se trouvant dans les deux fichiers last-bkp-acfsdb-data.tar.gz et last-bkp-acfsdb-FRA.tar.gz<br \/>\nOn replace les fichiers redolog et controlfile pr\u00e9c\u00e8demment mis de cot\u00e9. On red\u00e9marre la base en mode mount et on fait un recover:<\/p>\n<pre class=\"brush: sql; gutter: true; first-line: 1\">SQL&gt; startup mount;\nORACLE instance started.Total System Global Area\u00a0 943669248 bytes\nFixed Size\u00a0\u00a0\u00a0\u00a0\u00a0 2267176 bytes\nVariable Size\u00a0\u00a0\u00a0 251660248 bytes\nDatabase Buffers\u00a0\u00a0 683671552 bytes\nRedo Buffers\u00a0\u00a0\u00a0\u00a0\u00a0 6070272 bytes\nDatabase mounted.\nSQL&gt; recover database;\nMedia recovery complete.\nSQL&gt; alter database open;\nDatabase altered.SQL&gt; select count(*) from testtbs1;\u00a0 COUNT(*)\n----------\n\u00a0\u00a0\u00a0\u00a0 88302<\/pre>\n<p><strong>N. B.<\/strong>: La consommation d&#8217;espace peut \u00eatre vu par la commande df -h ou par les commandes acfsutil info fs et acfsutil snap info \/u03.<\/p>\n<h3>Conclusion<\/h3>\n<p>Les commandes d&#8217;ACFS permettent de mettre en \u0153uvre facilement un backup d&#8217;une base sur ce\u00a0syst\u00e8me de fichier. On notera que rien n&#8217;est encore apparu du cot\u00e9 de RMAN pour prendre en compte cette capacit\u00e9 d&#8217;ACFS.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>La version 12c d&#8217;Oracle Grid Infrastructure introduit de nombreuses nouveaut\u00e9s dans le support d&#8217;ACFS, le syst\u00e8me de fichiers clusteris\u00e9s d&#8217;Oracle.\u00a0Nous\u00a0abordons dans ce posting la capacit\u00e9 d&#8217;ACFS d&#8217;\u00eatre le syst\u00e8me de fichier de votre base de donn\u00e9es ainsi que sa capacit\u00e9 de mise en \u0153uvre des snapshots. Rappel sur ACFS Ce syst\u00e8me de fichier est apparu [&hellip;]<\/p>\n","protected":false},"author":27,"featured_media":2734,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[48],"tags":[37,202,258,209,237],"type_dbi":[],"class_list":["post-2974","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technology-survey","tag-asm","tag-backup","tag-grid","tag-oracle-12c","tag-snapshot"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Oracle Database 12c: ACFS - un syst\u00e8me de fichier pour vos bases - dbi Blog<\/title>\n<meta name=\"description\" content=\"La version 12c d&#039;Oracle Grid Infrastructure introduit de nombreuses nouveaut\u00e9s dans le support d&#039;ACFS, le syst\u00e8me de fichiers clusteris\u00e9s d&#039;Oracle. Nous abordons dans ce posting la capacit\u00e9 d&#039;ACFS d&#039;\u00eatre le syst\u00e8me de fichier de votre base de donn\u00e9es ainsi que sa capacit\u00e9 de mise en \u0153uvre des snapshots.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/oracle-database-12c-acfs-un-systeme-de-fichier-pour-vos-bases\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Oracle Database 12c: ACFS - un syst\u00e8me de fichier pour vos bases\" \/>\n<meta property=\"og:description\" content=\"La version 12c d&#039;Oracle Grid Infrastructure introduit de nombreuses nouveaut\u00e9s dans le support d&#039;ACFS, le syst\u00e8me de fichiers clusteris\u00e9s d&#039;Oracle. 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