{"id":4091,"date":"2018-10-24T08:34:55","date_gmt":"2018-10-24T08:34:55","guid":{"rendered":"https:\/\/dbtut.com\/?p=4091"},"modified":"2018-11-26T20:53:21","modified_gmt":"2018-11-26T20:53:21","slug":"what-is-buffer-pool-extension","status":"publish","type":"post","link":"https:\/\/dbtut.com\/index.php\/2018\/10\/24\/what-is-buffer-pool-extension\/","title":{"rendered":"What is Buffer Pool Extension"},"content":{"rendered":"<p>&nbsp;<\/p>\n<p>Buffer Pool Extension is a feature that was introduced in SQL Server 2014. With this feature, SQL Server uses the disk we specified for Buffer Pool. (To avoid a performance problem, the disk you specify must be fast. For example, SSD Disk)<\/p>\n<p>&nbsp;<\/p>\n<h3>So what is Buffer Pool?<\/h3>\n<p>In SQL Server, data and index pages are not read directly from the disk. When the user wants to access the data, the data is transferred to the buffer pool area and cached. The data in the buffer pool is then forwarded to the requesting user.<\/p>\n<p>In this way, frequently accessed data is kept in the buffer pool. For detailed information, I recommend you read the article &#8220;<a href=\"https:\/\/dbtut.com\/index.php\/2018\/05\/28\/what-is-database-checkpoint\/\" target=\"_blank\" rel=\"noopener\">What is Database Checkpoint<\/a>&#8220;.<\/p>\n<p>Buffer Pool Extension is an ideal choice for database servers with insufficient memory. If you have a SSD disk defined on this server, you can use this SSD disk as memory.<\/p>\n<p>If a problem occurs with the disk we use for Buffer Pool Extension, SQL Server automatically disables the Buffer Pool Extension.<\/p>\n<p>You can use Buffer Pool Extension only in Enterprise and Standard Edition.<\/p>\n<p>You can use the following two dmw for Buffer Pool Extension.<\/p>\n<pre class=\"lang:default decode:true\">select * from sys.dm_os_buffer_pool_extension_configuration\r\nselect * from sys.dm_os_buffer_descriptors<\/pre>\n<p>&nbsp;<\/p>\n<p>To prevent data loss, only the committed data is written to the Buffer Pool Extension. We can activate Buffer Pool Extension with the following script.<\/p>\n<pre class=\"lang:default decode:true\">ALTER SERVER CONFIGURATION\r\nSET BUFFER POOL EXTENSION ON\r\n(FILENAME = 'C:\\MSSQL\\BufferPoolExtensionOrnek.BPE',SIZE = 10 GB)<\/pre>\n<p>&nbsp;<\/p>\n<p>If the field you set for Buffer Pool Extension is smaller than the MAX SERVER MEMORY set for SQL Server, you will get an error as follows.<\/p>\n<p><span lang=\"tr\">For MAX SERVER MEMORY and other settings, I recommend that you read articles &#8220;<\/span><a href=\"https:\/\/dbtut.com\/index.php\/2018\/10\/25\/numa-nodes-max-min-server-memory-log-pages-in-memory-and-maxdop\/\" target=\"_blank\" rel=\"noopener\"><span lang=\"en-US\">Numa Nodes, MAX\/MIN Server Memory, Log Pages In Memory and MAXDOP<\/span><\/a><span lang=\"tr\">&#8221; and &#8220;<\/span><a href=\"https:\/\/dbtut.com\/index.php\/2018\/07\/14\/sp_configureserver-level-configurations-in-sql-server\/\" target=\"_blank\" rel=\"noopener\"><span lang=\"en-US\">sp_configure (Server-Level Configurations in SQL Server)<\/span><\/a><span lang=\"tr\">&#8220;.<\/span><\/p>\n<p><span style=\"font-size: 10pt;\"><em>Msg 868, Level 16, State 1, Line 1<\/em><\/span><\/p>\n<p><span style=\"font-size: 10pt;\"><em>Buffer pool extension size must be larger than the current memory allocation threshold 10240 MB. Buffer pool extension is not enabled.<\/em><\/span><\/p>\n<p>&nbsp;<\/p>\n<p>You can close Buffer Pool Extension as follows.<\/p>\n<pre class=\"lang:default decode:true\">ALTER SERVER CONFIGURATION\r\nSET BUFFER POOL EXTENSION OFF<\/pre>\n<p>&nbsp;<\/p>\n<p>If you want to open the Buffer Pool Extension again after turning it off, if the value you set is larger than MAX SERVER MEMORY and is smaller than the field you previously set for Buffer Pool Extension, you will still get this error.<\/p>\n<p>To get rid of this situation, you will need to restart the SQL Server Service.<\/p>\n<p><span style=\"font-size: 10pt;\"><em>Msg 868, Level 16, State 1, Line 1<\/em><\/span><\/p>\n<p><span style=\"font-size: 10pt;\"><em>Buffer pool extension size must be larger than the current memory allocation threshold 10240 MB. Buffer pool extension is not enabled.<\/em><\/span><\/p>\n\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_4091\" class=\"pvc_stats all  \" data-element-id=\"4091\" 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>&nbsp; Buffer Pool Extension is a feature that was introduced in SQL Server 2014. With this feature, SQL Server uses the disk we specified for Buffer Pool. (To avoid a performance problem, the disk you specify must be fast. For example, SSD Disk) &nbsp; So what is Buffer Pool? In SQL Server, data and index &hellip;<\/p>\n<div class=\"pvc_clear\"><\/div>\n<p id=\"pvc_stats_4091\" class=\"pvc_stats all  \" data-element-id=\"4091\" 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":1,"featured_media":0,"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":[3],"tags":[],"class_list":["post-4091","post","type-post","status-publish","format-standard","","category-mssql"],"aioseo_notices":[],"a3_pvc":{"activated":true,"total_views":245,"today_views":0},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.9 - 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