{"id":548,"date":"2010-12-16T18:15:00","date_gmt":"2010-12-16T18:15:00","guid":{"rendered":"\/blogs\/jonathan\/post\/An-XEvent-a-Day-(16-of-31)-How-Many-Checkpoints-are-Issued-During-a-Full-Backup.aspx"},"modified":"2017-04-13T12:13:37","modified_gmt":"2017-04-13T16:13:37","slug":"an-xevent-a-day-16-of-31-how-many-checkpoints-are-issued-during-a-full-backup","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/jonathan\/an-xevent-a-day-16-of-31-how-many-checkpoints-are-issued-during-a-full-backup\/","title":{"rendered":"An XEvent a Day (16 of 31) \u2013 How Many Checkpoints are Issued During a Full Backup?"},"content":{"rendered":"

\nThis wasn’t my intended blog post for today, but last night a question<\/a> came across #SQLHelp<\/a> on Twitter from Varun (Twitter<\/a>).\n<\/p>\n

\n

\n\t#sqlhelp<\/a> how many checkpoints are issued during a full backup?\n\t<\/p>\n<\/blockquote>\n

\nThe question was answered<\/a> by Robert Davis (Blog|Twitter) as:\n<\/p>\n

\n

\n\tJust 1, at the very start. RT @<\/em>1sql<\/em><\/a>: <\/em>#sqlhelp<\/em><\/a> how many checkpoints are issued during a full backup?<\/em>\n\t<\/p>\n<\/blockquote>\n

\nThis seemed like a great thing to test out with Extended Events so I ran through the available Events in SQL Server 2008, and the only Event related to Backup is the sqlserver.databases_backup_restore_throughput Event, something which is a topic for another blog post, but that doesn’t matter because we can still do testing of this by using the Events available in Extended Events.  The sqlserver.sql_statement_starting, sqlserver.sql_statement_completed, sqlserver.checkpoint_begin and sqlserver.checkpoint_end Events can be used to test this with appropriate Predicate definitions.\n<\/p>\n

\nTo test this I used a copy of two databases on a development server.  One is a source database and the second is a reporting database.  I also duplicated the ETL process that extracts data from a source database and transforms it into the reporting schema so that I could test this under a workload that would be changing data and should cause checkpoints to occur inside of the reporting database.  Then I queried sys.databases (ok I actually used DB_ID(‘Sample_Reporting’)) to get the database_id for the Sample_Reporting database to use in the Predicate for the sqlserver.checkpoint_begin and sqlserver.checkpoint_end Events. \n<\/p>\n

\n\"image\"<\/a>\n<\/p>\n

\nThen I opened a new Query Window in SSMS and used that connections session_id in the Predicate for the sqlserver.sql_statement_starting and sqlserver.sql_statement_completed Events in the Event Session.  The result was the following Session definition.\n<\/p>\n

\n\t-- Create the Event Session
\n\t<\/span>CREATE <\/span>EVENT SESSION BackupCheckPoints
\n\t<\/span>ON <\/span>SERVER
\n\t<\/span>ADD <\/span>EVENT sqlserver.sql_statement_starting
\n\t<\/span>(    <\/span>ACTION <\/span>(<\/span>sqlserver.database_id<\/span>, <\/span>sqlserver.sql_text<\/span>)
\n\t    <\/span>WHERE <\/span>(<\/span>sqlserver.session_id <\/span>= <\/span>113<\/span>)),
\n\t<\/span>ADD <\/span>EVENT sqlserver.sql_statement_completed
\n\t<\/span>(    <\/span>ACTION <\/span>(<\/span>sqlserver.database_id<\/span>, <\/span>sqlserver.sql_text<\/span>)
\n\t    <\/span>WHERE <\/span>(<\/span>sqlserver.session_id <\/span>= <\/span>113<\/span>)),
\n\t<\/span>ADD <\/span>EVENT sqlserver.checkpoint_begin
\n\t<\/span>(    <\/span>WHERE <\/span>(<\/span>database_id<\/span>= <\/span>41<\/span>)),
\n\t<\/span>ADD <\/span>EVENT sqlserver.checkpoint_end
\n\t<\/span>(    <\/span>WHERE <\/span>(<\/span>database_id <\/span>= <\/span>41<\/span>))
\n\t<\/span>ADD <\/span>TARGET package0.ring_buffer
\n\tGO
\n\t<\/span>-- Alter the Session to Start it
\n\t<\/span>ALTER <\/span>EVENT SESSION BackupCheckpoints
\n\t<\/span>ON <\/span>SERVER
\n\tSTATE<\/span>=<\/span>START
\n\tGO<\/span><\/code>\n<\/p><\/blockquote>\n

\nWith the Event Session started, I then started a FULL backup of the Sample Reporting database, followed by starting the ETL processes.  When the FULL backup completed I dropped the Events from the Event Session so that no further Event collection occurred.\n<\/p>\n

\n\t-- Drop Events to halt Event collection
\n\t<\/span>ALTER <\/span>EVENT SESSION BackupCheckPoints
\n\t<\/span>ON <\/span>SERVER
\n\t<\/span>DROP <\/span>EVENT sqlserver.sql_statement_starting<\/span>,
\n\t<\/span>DROP <\/span>EVENT sqlserver.sql_statement_completed<\/span>,
\n\t<\/span>DROP <\/span>EVENT sqlserver.checkpoint_begin<\/span>,
\n\t<\/span>DROP <\/span>EVENT sqlserver.checkpoint_end<\/span><\/code>\n<\/p><\/blockquote>\n

\nNow we can query the ring_buffer Target and see what has occurred during the FULL backup of the Sample_Reporting database.\n<\/p>\n

\n\t-- Query the XML to get the Target Data
\n\t<\/span>SELECT
\n\t    <\/span>n.value<\/span>(<\/span>'(event\/@name)[1]'<\/span>, <\/span>'varchar(50)'<\/span>) <\/span>AS <\/span>event_name<\/span>,
\n\t    <\/span>n.value<\/span>(<\/span>'(event\/@package)[1]'<\/span>, <\/span>'varchar(50)'<\/span>) <\/span>AS <\/span>package_name<\/span>,
\n\t    <\/span>DATEADD<\/span>(<\/span>hh<\/span>,
\n\t            <\/span>DATEDIFF<\/span>(<\/span>hh<\/span>, <\/span>GETUTCDATE<\/span>(), <\/span>CURRENT_TIMESTAMP<\/span>),
\n\t            <\/span>n.value<\/span>(<\/span>'(event\/@timestamp)[1]'<\/span>, <\/span>'datetime2'<\/span>)) <\/span>AS <\/span>[timestamp]<\/span>,
\n\t    <\/span>ISNULL<\/span>(<\/span>n.value<\/span>(<\/span>'(event\/data[@name="database_id"]\/value)[1]'<\/span>, <\/span>'int'<\/span>),
\n\t            <\/span>n.value<\/span>(<\/span>'(event\/action[@name="database_id"]\/value)[1]'<\/span>, <\/span>'int'<\/span>)) <\/span>AS <\/span>[database_id]<\/span>,
\n\t    <\/span>n.value<\/span>(<\/span>'(event\/action[@name="sql_text"]\/value)[1]'<\/span>, <\/span>'nvarchar(max)'<\/span>) <\/span>AS <\/span>[sql_text]
\n\t<\/span>FROM
\n\t<\/span>(    <\/span>SELECT <\/span>td.query<\/span>(<\/span>'.'<\/span>) <\/span>AS <\/span>n
\n\t    <\/span>FROM
\n\t    <\/span>(
\n\t        <\/span>SELECT <\/span>CAST<\/span>(<\/span>target_data <\/span>AS XML<\/span>) <\/span>AS <\/span>target_data
\n\t        <\/span>FROM <\/span>sys.dm_xe_sessions <\/span>AS <\/span>s
\n\t        <\/span>JOIN <\/span>sys.dm_xe_session_targets <\/span>AS <\/span>t
\n\t            <\/span>ON <\/span>t.event_session_address <\/span>= <\/span>s.address
\n\t        <\/span>WHERE <\/span>s.name <\/span>= <\/span>'BackupCheckpoints'
\n\t          <\/span>AND <\/span>t.target_name <\/span>= <\/span>'ring_buffer'
\n\t    <\/span>) <\/span>AS <\/span>sub
\n\t    <\/span>CROSS <\/span>APPLY target_data.nodes<\/span>(<\/span>'RingBufferTarget\/event'<\/span>) <\/span>AS <\/span>q<\/span>(<\/span>td<\/span>)
\n\t) <\/span>AS <\/span>tab
\n\tGO<\/span><\/code>\n<\/p><\/blockquote>\n

\n\"image\"<\/a>\n<\/p>\n

\nAs you can see in the above screenshot, multiple checkpoints can occur during a FULL backup of a database in SQL Server 2008.  According to Paul Randal, “Checkpoints exist for two reasons—to batch up write I\/Os to improve performance and to reduce the time required for crash recovery” (http:\/\/technet.microsoft.com\/en-us\/magazine\/2009.02.logging.aspx<\/a>).  Since we are continuing to make changes to the data inside of the system while the FULL backup occurs, there is a continued need for CHECKPOINT’s to occur for the database.<\/p>\n","protected":false},"excerpt":{"rendered":"

This wasn’t my intended blog post for today, but last night a question came across #SQLHelp on Twitter from Varun (Twitter). #sqlhelp how many checkpoints are issued during a full backup? The question was answered by Robert Davis (Blog|Twitter) as: Just 1, at the very start. RT @1sql: #sqlhelp how many checkpoints are issued during […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,38,45],"tags":[],"class_list":["post-548","post","type-post","status-publish","format-standard","hentry","category-extended-events","category-sql-server-2008","category-xevent-a-day-series"],"yoast_head":"\nAn XEvent a Day (16 of 31) \u2013 How Many Checkpoints are Issued During a Full Backup? - Jonathan Kehayias<\/title>\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.sqlskills.com\/blogs\/jonathan\/an-xevent-a-day-16-of-31-how-many-checkpoints-are-issued-during-a-full-backup\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"An XEvent a Day (16 of 31) \u2013 How Many Checkpoints are Issued During a Full Backup? - Jonathan Kehayias\" \/>\n<meta property=\"og:description\" content=\"This wasn’t my intended blog post for today, but last night a question came across #SQLHelp on Twitter from Varun (Twitter). #sqlhelp how many checkpoints are issued during a full backup? 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