Articles Posted in the " SQL Server " Category

  • Which Node SQL Cluster was Running

    Which Node SQL Cluster was Running

    While troubleshooting unplanned SQL cluster failover few questions are asked commonly.

    1. When did the last failover occur?
    2. How frequently you failover (planned and unplanned)?
    3. Did this happen recently.

    All these questions can be answered by this query.  You output will depend how frequently you recycle error log and retention of error log.

    You can also use this query to look for other items in your error log.

    
    IF NOT EXISTS (SELECT 1 FROM sys.objects WHERE OBJECT_ID = OBJECT_ID(N'#ERROR') AND TYPE IN (N'U'))
    BEGIN
    CREATE TABLE #ERROR (
    LogDate DATETIME,
    ProcessInfo NVARCHAR(255),
    LogText NVARCHAR(MAX)
    )
    END
    GO
    
    IF NOT EXISTS (SELECT 

  • Optimize SQL Backup

    Optimize SQL Backup

    Database backup is one of the regular tasks DBA’s perform but few explore all the options that are built in the product. Instead of exploring and using built in switches I noticed DBA’s try writing custom scripts or buying third party tools.
    I explored some of the options and was able to do a full backup of 8TB size database under 2.5 hours. I obtained a 30% performance improvement with using non default values for 3 of the switches that come with Backup command.

    • MAXTRANSFERSIZE
    • BLOCKSIZE
    • Number of BACKUP DEVICES (You can use up to 64)-These files can be in

  • Find Transactional Replication Details

    Find Transactional Replication Details

    This will be a quick post about a script to find replication metadata in details.  You need to run this in your distributor (where distribution database reside) server and filter in various ways depending on your need.  Also modify order by based on what you are looking for.

    Run where distribution database reside

    USE distribution;
    GO
    SELECT DISTINCT
            p.publication ,
            p.publisher_db ,
            SUBSTRING(da.name, 0, CHARINDEX('-', da.name)) AS Source_Server ,
            a.article ,
            a.source_object ,
            s.subscriber_db ,
            REVERSE(SUBSTRING(REVERSE(da.name),
                              CHARINDEX('-', REVERSE(da.name)) + 1,
                              ( ( CHARINDEX('-', REVERSE(da.name),
                                            CHARINDEX('-', REVERSE(da.name)) + 1) )
                                - ( CHARINDEX('-', REVERSE(da.name)) ) - 1 ))) AS Destination_Server ,
            

  • Monitoring Transaction Replication Latency in Real Time

    Monitoring Transaction Replication Latency in Real Time

    This post will give a practical solution with complete code to monitor SQL server transactional replication latency in real time.  My solution assumes you are using common distribution agent.  With minor change you can also implement this for independent distribution agent.

    This solution is a implementation of Kendra Little’s blog post.

    Concept is to create a table with a single row storing current date-time (updated via a sql job every minute).  Replicate that data to your subscriber and measure the difference between current time and time-stamp in subscriber table.

    Before you run any of these code make sure you read …


  • Deadlock Detection and Reporting part-II

    Deadlock Detection and Reporting part-II

    This is a continuation of the series about deadlock.  First part was how you detect deadlock in SQL Server and collect that information.  This part will be about reporting from the collected information.

    On the 2nd step of the job the code below will purse the xml and send .xdl file along with information in tabular format.

    2nd step on the job:

    SET NOCOUNT ON
    SET QUOTED_IDENTIFIER ON
    IF EXISTS ( SELECT *
    FROM tempdb.sys.tables
    WHERE name LIKE '##tmpDeadlockEvents%' )
    DROP TABLE ##tmpDeadlockEvents
    CREATE TABLE ##tmpDeadlockEvents ( [deadlock-list] XML )
    DECLARE @subjectText VARCHAR(250) ,
    @bodyText NVARCHAR(MAX)
    DECLARE @x XML
    DECLARE