Wednesday, August 28, 2013

Helpful SQL Queries for measure performance of database

SQL queries are easily readable if they are in a standard SQL format; this can be achieved with the help of an online SQL formatting tool at: 

1. Following set of queries can be used to get various values from the database.

  • Find all columns in a Database

SELECT AS ColumnName, AS TableName
FROM   sys.columns SC
       INNER JOIN sys.tables ST
               ON ST.object_id = SC.object_id

  • List all the Functions in a Database

SELECT name AS function_name,
FROM   sys.objects
WHERE  type_desc LIKE '%FUNCTION%'; 

  • List all the Stored Procedures in a Database 

FROM   sys.procedures
ORDER  BY name 

  • List all the views in a Database

FROM   sys.views
ORDER  BY name 

  • List all the tables in a Database

FROM   sys.tables

  • Find specific column and related table names

SELECT AS table_name,SCHEMA_NAME(schema_idAS schema_name, AS column_name
FROM sys.tables AS 
INNER JOIN sys.columns c ON t.OBJECT_ID 
'%column name%'ORDER BY schema_nametable_name

  • Data type of a column

SELECT 'Column Name',
    t.Name 'Data type',
    c.max_length 'Max Length',
    c.precision ,
    c.scale ,
    ISNULL(i.is_primary_key, 0) 'Primary Key'
    sys.columns c
    sys.types t ON c.system_type_id = t.system_type_id
    sys.index_columns ic ON ic.object_id = c.object_id AND ic.column_id = c.column_id
    sys.indexes i ON ic.object_id = i.object_id AND ic.index_id = i.index_id

    c.object_id = OBJECT_ID('YourTableName')

  • Find specific column and related table names

SELECT AS table_name, SCHEMA_NAME(schema_id) AS schema_name, AS column_name FROM sys.tables AS t INNER JOIN sys.columns c ON t.OBJECT_ID = c.OBJECT_ID WHERE LIKE '%column name%' ORDER BY schema_name, table_name
2. Queries to check if best practice is followed in SPs
SELECT routine_name,
FROM   information_schema.routines
WHERE  routine_definition LIKE '%select * from%'
       AND routine_type = 'PROCEDURE' 
Note: Verify for each combination, i.e., select*from, select *from, select* from.
  • Query to identify if any SP uses IN or Not IN

SELECT routine_name,
FROM   information_schema.routines
WHERE  routine_definition LIKE '% in (%'
       AND routine_type = 'PROCEDURE' 
SELECT routine_name,
FROM   information_schema.routines
WHERE  routine_definition LIKE '% not in (%'
       AND routine_type = 'PROCEDURE' 
Note: Verify for each combination of IN and Not IN, i.e., ‘IN(‘, ‘ IN (‘, ‘NotIN(‘, ‘Not IN(‘, ‘Not IN (‘.
  • SP without initial comment
WHERE ROUTINE_DEFINITION not LIKE '%================%'
3. Following queries can be used to get performace details of the database
  • CPU utilization in seconds
SELECT (total_worker_time * 1.0) / 1000000 AS CPU_Utilized_in_Seconds, text,*
FROM sys.dm_exec_query_stats
CROSS APPLY sys.dm_exec_sql_text(sql_handle)
order by CPU_Utilized_in_Seconds desc

  • To get longest running query, memory used & other details  
SELECT Top 10 SUBSTRING(qt.TEXT, (qs.statement_start_offset/2)+1,
((CASE qs.statement_end_offset
ELSE qs.statement_end_offset
END - qs.statement_start_offset)/2)+1),
qs.total_logical_reads, qs.last_logical_reads,
qs.total_logical_writes, qs.last_logical_writes,
qs.total_elapsed_time/1000000 total_elapsed_time_in_S,
qs.last_elapsed_time/1000000 last_elapsed_time_in_S,
FROM sys.dm_exec_query_stats qs
CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) qt
CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) qp
ORDER BY qs.total_logical_reads DESC

  • Last query ran on SQL
SELECT deqs.last_execution_time AS [Time]dest.TEXT AS [Query]
FROM sys.dm_exec_query_stats AS deqs
CROSS APPLY sys.dm_exec_sql_text(deqs.sql_handleAS dest
ORDER BY deqs.last_execution_time DESC
  • Plan cache hit ratio
WITH cte1
     AS (SELECT [dopc].[object_name],
                  OVER (
                    partition BY [dopc].[object_name], [dopc].[instance_name]
                    ORDER BY [dopc].[counter_name] ) AS r_n
         FROM   [sys].[dm_os_performance_counters] AS dopc
         WHERE  [dopc].[counter_name] LIKE '%Cache Hit Ratio%'
                AND ( [dopc].[object_name] LIKE '%Plan Cache%'
                       OR [dopc].[object_name] LIKE '%Buffer Cache%' )
                AND [dopc].[instance_name] LIKE '%_Total%')
SELECT CONVERT(DECIMAL(16, 2), ( [c].[cntr_value] * 1.0 / [c1].[cntr_value] ) *
       AS [hit_pct]
FROM   [cte1] AS c
       INNER JOIN [cte1] AS c1
               ON c.[object_name] = c1.[object_name]
                  AND c.[instance_name] = c1.[instance_name]
WHERE  [c].[r_n] = 1
       AND [c1].[r_n] = 2;
  • Plan cache reuse
DECLARE @single DECIMAL(18, 2)
DECLARE @reused DECIMAL(18, 2)
DECLARE @total DECIMAL(18, 2)

SELECT @single = Sum(CASE ( usecounts )
                       WHEN 1 THEN 1
                       ELSE 0
                     END) * 1.0,
       @reused = Sum(CASE ( usecounts )
                       WHEN 1 THEN 0
                       ELSE 1
                     END) * 1.0,
       @total = Count(usecounts) * 1.0
FROM   sys.dm_exec_cached_plans;

SELECT ( @single / @total ) * 100.0; 
  • Identify if a column is reaching limit of the datatype
WITH cte_1
     AS (SELECT Object_name(a.object_id) AS table_name,
       AS columnname,
                CONVERT(BIGINT, Isnull(a.last_value, 0)) AS last_value,
                  WHEN = 'tinyint' THEN 255
                  WHEN = 'smallint' THEN 32767
                  WHEN = 'int' THEN 2147483647
                  WHEN = 'bigint' THEN 9223372036854775807
                END    AS dt_value
         FROM   sys.identity_columns a
                INNER JOIN sys.types AS b
                        ON a.system_type_id = b.system_type_id),
     AS (SELECT *,
                CONVERT(NUMERIC(18, 2), ( ( CONVERT(FLOAT, last_value) /
                                            CONVERT(FLOAT, dt_value) ) * 100 ))
                AS 'Percent'
         FROM   cte_1)
FROM   cte_2
ORDER  BY 'Percent' DESC;
  • Number of unused indexes
SELECT db_name() as dbname, as tablename, as indexname,
       user_seeks + user_scans + user_lookups as total_reads,
       user_updates as total_writes,
       (SELECT SUM(p.rows)
          FROM sys.partitions p
         WHERE p.index_id = s.index_id
           AND s.object_id = p.object_id) as number_of_rows,
  FROM sys.indexes i
 INNER JOIN sys.objects o
    ON i.object_id = o.object_id
  LEFT OUTER JOIN sys.dm_db_index_usage_stats s
    ON i.index_id = s.index_id
   AND s.object_id = i.object_id
 WHERE OBJECTPROPERTY(o.object_id, 'IsUserTable') = 1
   AND ISNULL(s.database_id, DB_ID()) = DB_ID()
   AND (
        isnull(s.last_user_seek, '19000101') < datediff(month, -1, getdate()) AND
        isnull(s.last_user_scan, '19000101') < datediff(month, -1, getdate()) AND
        isnull(s.last_user_lookup, '19000101') < datediff(month, -1, getdate())
 ORDER BY total_reads DESC; 
  • Tables without clustered indexes defined
  SELECT db_name() as dbname, as tablename,
         (SELECT SUM(p.rows)
            FROM sys.partitions p
           WHERE p.index_id = i.index_id
             AND i.object_id = p.object_id) as number_of_rows
    FROM sys.indexes i
   INNER JOIN sys.objects o
      ON i.object_id = o.object_id
   WHERE OBJECTPROPERTY(o.object_id, 'IsUserTable') = 1
     AND OBJECTPROPERTY(o.object_id, 'TableHasClustIndex') = 0
 WHERE number_of_rows > 1000;
  • Possible duplicate indexes

WITH  indexcols
        AS (SELECT object_id AS id,
                index_id AS indid,
                (SELECT CASE keyno
                          WHEN 0 THEN NULL
                          ELSE colid
                        END AS [data()]
                  FROM sys.sysindexkeys AS k
                  WHERE = i.object_id
                    AND k.indid = i.index_id
                  ORDER BY keyno,
                 XML PATH('')
                ) AS cols,
                (SELECT CASE keyno
                          WHEN 0 THEN colid
                          ELSE NULL
                        END AS [data()]
                  FROM sys.sysindexkeys AS k
                  WHERE = i.object_id
                    AND k.indid = i.index_id
                  ORDER BY colid
                 XML PATH('')
                ) AS inc
              FROM sys.indexes AS i
        + OBJECT_NAME( AS 'TableName', + CASE c1.indid
                  WHEN 1 THEN ' (clustered index)'
                  ELSE ' (nonclustered index)'
                END AS 'IndexName', + CASE c2.indid
                  WHEN 1 THEN ' (clustered index)'
                  ELSE ' (nonclustered index)'
                END AS 'ExactDuplicatedIndexName'
    FROM indexcols AS c1
    INNER JOIN indexcols AS c2
    ON =
      AND c1.indid < c2.indid
      AND c1.cols = c2.cols
      AND =;
  • Performance related database settings
DECLARE @Result INT; DECLARE @High INT; -- For settings you feel need to be righ DECLARE @Med INT; -- For settings you want to know about but arent critical DECLARE @Low INT; -- For settings that you want flagged but are low importance SELECT @High = 70, @Med = 40, @Low = 10; SELECT @Result = SUM(CASE WHEN [d].[compatibility_level] != [d2].[compatibility_level] THEN @Med ELSE 0 END + CASE WHEN [d].[collation_name] != [d2].[collation_name] THEN @Med ELSE 0 END + CASE WHEN [d].[user_access] != 0 THEN @Low ELSE 0 END + CASE WHEN [d].[is_auto_close_on] = 1 THEN @High ELSE 0 END + CASE WHEN [d].[is_auto_shrink_on] = 1 THEN @High ELSE 0 END + CASE WHEN [d].[state] != 0 THEN @Low ELSE 0 END + CASE WHEN [d].[is_auto_create_stats_on] != 1 THEN @Med ELSE 0 END + CASE WHEN [d].[is_auto_update_stats_on] != 1 THEN @Med ELSE 0 END + CASE WHEN [d].[is_ansi_nulls_on] = 1 THEN @High ELSE 0 END + CASE WHEN [d].[is_ansi_padding_on] = 1 THEN @High ELSE 0 END + CASE WHEN [d].[is_ansi_warnings_on] = 1 THEN @High ELSE 0 END + CASE WHEN [d].[is_arithabort_on] = 1 THEN @High ELSE 0 END) FROM [sys].[databases] AS d CROSS JOIN [sys].[databases] AS d2 WHERE [d2].[name] = 'master' AND ([d].[database_id] = DB_ID() AND [d].[state_desc] = 'Online'); SELECT @Result;
Happy Coding!!

Monday, July 8, 2013

Making your aspx page IE compatible

We found that in some cases our site is showing some weird UI behavior, It was working fine when we are opening our site on clients local machine with http://localhost but when we use the machine name instead of the local host like (http://machinename ) we are getting a broken UI page.
When we observer the page in IE developer tool (F12) we found that IE 10 is not able to understand the type of document and because of this we are getting the UI error.
To fix this problem we have just added a meta tag after title tag in our pages so that browser can detect correct Browser mode and document Mode
<meta http-equiv="X-UA-Compatible" content="IE=100" />
This way you can change the browser compatibility mode.

Happy Coding!!

Friday, June 14, 2013

Self Signed Certificate

Following link has described how to create self signed certificate for development/Testing purpose

SelfCert Exe Download location:!175&authkey=yeHVTUTVzGE$

Friday, June 7, 2013

javascript don't execute after partial postback

If you are doing partial postback in your page then code on $(document).ready() function will not execute.

You will experience when page loads then your javascript functionality works but after partial postback your code is not working

For resolve this issue you need to write code in following format.

Write general code in SetLocalValues() function which you want to call on $(document).ready() function

var prm = Sys.WebForms.PageRequestManager.getInstance();prm.add_endRequest(function () {//Write your code here//This function executes after partial postback so you need to call $(document).ready() functions code here});
$(document).ready(function () {        SetLocalValues();});
var prm = Sys.WebForms.PageRequestManager.getInstance();prm.add_endRequest(function () {        SetLocalValues();});function SetLocalValues() {//Write your code}
This way i have resolved javascript issue.

Happy Coding!!