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Jack Vamvas's Blog

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    SQL Server –WRITELOG and how to reduce it

    SQL Server Books online defines the wait type WRITELOG as “Occurs while waiting for a log flush to complete. Common operations that cause log flushes are checkpoints and transaction commits. “ A checkpoint writes all SQL dirty pages , currently in the buffer,  onto disk. Transaction commits m......

    Jack Vamvas  Posted on Jan 9 2012 1:00AM
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    SQL WAIT TYPE – OLEDB and how to reduce it

    SQL Server Books online defines the OLEDB wait stat type as “Occurs when SQL Server calls the SQL Server Native Client OLE DB Provider. This wait type is not used for synchronization. Instead, it indicates the duration of calls to the OLE DB provider” Examples of where OLEDB wait type may occur is ......

    Jack Vamvas  Posted on Oct 15 2011 12:00AM
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    SQL WAIT STAT - TRACEWRITE and how to reduce it

    SQL Server Books online defines the TRACEWRITE sql wait stat type as “Occurs when the SQL Trace rowset trace provider waits for either a free buffer or a buffer with events to process” The trace rowset provider drops events from the internal buffer, if it needs the......

    Jack Vamvas  Posted on May 20 2011 6:38AM
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    IO_completion on disk solved with Wait Stats and Perfmon

    SQL Server Wait Stats analysis and Perfmon Counters recorded high ASYNC_IO_COMPLETION, IO_COMLETION and BACKUPIO on Production SQL Servers. At first, I thought just one server was underperforming. As more jobs starting delaying , it was obvious more than one server was experiencing a slowdown. A ......

    Jack Vamvas  Posted on May 13 2011 7:48AM
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    BACKUPIO and sql database backup

    SQL Server Books online defines BACKUPIO as “Occurs when a backup task is waiting for data, or is waiting for a buffer in which to store data. This type is not typical, except when a task is waiting for a tape mount.” BACKUPIO is not specifically an disk IO wait measure. And should not......

    Jack Vamvas  Posted on May 4 2011 6:18AM
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    Query Response Time measure

    When analysing the full Query Response time, it is of value to break the cycle down into 3 stages. This will allow greater understanding of what is occurring and how to resolve any delays. These three phases, will equal Total Time time taken for a query to respond. CPU (Running) = When in Running ......

    Jack Vamvas  Posted on Apr 15 2011 6:40AM
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    SQL Server – SOS_SCHEDULER_YIELD and how to reduce it

    SQL Server Books online defines SOS_SCHEDULER_YIELD as “Occurs when a task voluntarily yields the scheduler for other tasks to execute. During this wait the task is waiting for its quantum to be renewed “ What is happening when a SOS_SCHEDULER_YIELD is measured? The SQLOS worker has vol......

    Jack Vamvas  Posted on Apr 9 2011 6:44AM
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    SQL Server – LOGMGR and how to reduce it

    SQL Server Books online defines LOGMGR as "Occurs when a task is waiting for any outstanding log I/Os to finish before shutting down the log while closing the database" Depending on what other waits are occurring – this could indicate an IO bottleneck. For example, if ASYNCH_IO_COMPLETION, IO......

    Jack Vamvas  Posted on Mar 29 2011 7:30AM
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    SQL Server – IO_COMPLETION and how to reduce it

    SQL Server Books online defines IO_COMPLETION as “Occurs while waiting for I/O operations to complete. This wait type generally represents non-data page I/Os. Data page I/O completion waits appear as PAGEIOLATCH_* waits” As with ASYNC_IO_COMPLETION it is a symptom of an IO bottleneck......

    Jack Vamvas  Posted on Mar 25 2011 7:32AM
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    SQL Server Async_io_completion and how to reduce it

    SQL Server Books online defines Async_io_completion as “Occurs when a task is waiting for I/Os to finish “ Mainly a symptom of an IO bottleneck. Cross check by identifying other wait stat indicators such as: IO_COMPLETION, WRITELOG,PAGEIOLATCH_X. The appearance of at least one of these......

    Jack Vamvas  Posted on Mar 24 2011 7:41AM
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