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Fill null rows with previous non null value

Tue, 24 Jan 2017 15:39:37 +0100

Requirement: In table which has row numbers and need to fill null value with previous non null value.

Solution: Using Cross Apply and Top 1 row

Tsql Syntax (Gen):

Select Coalesce(Tbl1.<Column1>,Tbl2.<Column1>) GTIN,Tbl1.* From Tbl Tbl1 --Coalesce would fetch first non Null Value
Cross Apply (Select top 1 <Column2> from Tbl Tbl2 -- Top 1 value would get only 1 record
Where Tbl2.Row_Num <= Tbl1.Row_Num and <Column1> is not null --Row_N is row_number
Order by Row_Num Desc) QE2 --Order by Row_Namber

TSQL - Arithmetic conversion error

Wed, 05 Nov 2014 13:25:45 +0100

Found a new issue Arithmetic conversion error in SQL Statement. Have been fighting to find issue with Query, finally found solution for the issue. It's Aggregate function Sum. We get Integer column sum as Integer, when values go beyond 4 bite then we get this error.

Solution I found, I have used Sum(Cast(<ColumnName> as bigint)) This resolved the issue.

SSIS: System.IO.IOException: The process cannot access the file

Tue, 16 Oct 2012 10:32:37 +0100

Hello All,

Quite interesting thing I got to know today. If your SQL Tools has crashed in between loading. You may be trying to run a package and see above error.

Fix: Simple look for process SSIS Debug Host. This is the process which will lock your file when VS crash in between. Stop the service and you are good to go with re running package.

Cheers,
Raj

SSIS Learnings

Mon, 17 Oct 2011 17:21:25 +0100

It's interesting to work with SSIS Case statements in Derived columns.

Secondly today I am really lost, almost having no answer to conditional join in SSIS. Not yet figured whats the soultion. Please share if you have one, or will share if I figure out. I am basically trying to join source column to any of the columns in lookup table.

More detail once I have time :)

Need to know Detailed System Information?

Fri, 14 Oct 2011 12:13:14 +0100

Not a problem, just run MSINFO32 in command prompt or run.

You will see all detail information.

List of All DMV, Ref: Another Website.

Wed, 12 Oct 2011 10:02:14 +0100

DMV in SQL Server 2005 #1. sys.dm_broker_activated_tasks

DMV in SQL Server 2005 #2. sys.dm_broker_connections

DMV in SQL Server 2005 #3. sys.dm_broker_forwarded_messages

DMV in SQL Server 2005 #4. sys.dm_broker_queue_monitors

DMV in SQL Server 2005 #5. sys.dm_clr_appdomains

DMV in SQL Server 2005 #6. sys.dm_clr_loaded_assemblies

DMV in SQL Server 2005 #7. sys.dm_clr_properties

DMV in SQL Server 2005 #8. sys.dm_clr_tasks

DMV in SQL Server 2005 #9. sys.dm_db_file_space_usage

DMV in SQL Server 2005 #10. sys.dm_db_index_usage_stats

DMV in SQL Server 2005 #11. sys.dm_db_mirroring_connections

DMV in SQL Server 2005 #12. sys.dm_db_missing_index_details

DMV in SQL Server 2005 #13. sys.dm_db_missing_index_group_stats

DMV in SQL Server 2005 #14. sys.dm_db_missing_index_groups

DMV in SQL Server 2005 #15. sys.dm_db_partition_stats

DMV in SQL Server 2005 #16. sys.dm_db_session_space_usage

DMV in SQL Server 2005 #17. sys.dm_db_task_space_usage

DMV in SQL Server 2005 #18. sys.dm_exec_background_job_queue

DMV in SQL Server 2005 #19. sys.dm_exec_background_job_queue_stats

DMV in SQL Server 2005 #20. sys.dm_exec_cached_plans

DMV in SQL Server 2005 #21. sys.dm_exec_connections

DMV in SQL Server 2005 #22. sys.dm_exec_query_memory_grants

DMV in SQL Server 2005 #23. sys.dm_exec_query_optimizer_info

DMV in SQL Server 2005 #24. sys.dm_exec_query_resource_semaphores

DMV in SQL Server 2005 #25. sys.dm_exec_query_stats

DMV in SQL Server 2005 #26. sys.dm_exec_query_transformation_stats

DMV in SQL Server 2005 #27. sys.dm_exec_requests

DMV in SQL Server 2005 #28. sys.dm_exec_sessions

DMV in SQL Server 2005 #29. sys.dm_fts_active_catalogs

DMV in SQL Server 2005 #30. sys.dm_fts_index_population

DMV in SQL Server 2005 #31. sys.dm_fts_memory_buffers

DMV in SQL Server 2005 #32. sys.dm_fts_memory_pools

DMV in SQL Server 2005 #33. sys.dm_fts_population_ranges

DMV in SQL Server 2005 #34. sys.dm_io_backup_tapes

DMV in SQL Server 2005 #35. sys.dm_io_cluster_shared_drives

DMV in SQL Server 2005 #36. sys.dm_io_pending_io_requests

DMV in SQL Server 2005 #37. sys.dm_os_buffer_descriptors

DMV in SQL Server 2005 #38. sys.dm_os_child_instances

DMV in SQL Server 2005 #39. sys.dm_os_cluster_nodes

DMV in SQL Server 2005 #40. sys.dm_os_hosts

DMV in SQL Server 2005 #41. sys.dm_os_latch_stats

DMV in SQL Server 2005 #42. sys.dm_os_loaded_modules

DMV in SQL Server 2005 #43. sys.dm_os_memory_allocations

DMV in SQL Server 2005 #44. sys.dm_os_memory_cache_clock_hands

DMV in SQL Server 2005 #45. sys.dm_os_memory_cache_counters

DMV in SQL Server 2005 #46. sys.dm_os_memory_cache_entries

DMV in SQL Server 2005 #47. sys.dm_os_memory_cache_hash_tables

DMV in SQL Server 2005 #48. sys.dm_os_memory_clerks

DMV in SQL Server 2005 #49. sys.dm_os_memory_objects

DMV in SQL Server 2005 #50. sys.dm_os_memory_pools

DMV in SQL Server 2005 #51. sys.dm_os_performance_counters

DMV in SQL Server 2005 #52. sys.dm_os_ring_buffers

DMV in SQL Server 2005 #53. sys.dm_os_schedulers

DMV in SQL Server 2005 #54. sys.dm_os_stacks

DMV in SQL Server 2005 #55. sys.dm_os_sublatches

DMV in SQL Server 2005 #56. sys.dm_os_sys_info

DMV in SQL Server 2005 #57. sys.dm_os_tasks

DMV in SQL Server 2005 #58. sys.dm_os_threads

DMV in SQL Server 2005 #59. sys.dm_os_virtual_address_dump

DMV in SQL Server 2005 #60. sys.dm_os_wait_stats

DMV in SQL Server 2005 #61. sys.dm_os_waiting_tasks

DMV in SQL Server 2005 #62. sys.dm_os_worker_local_storage

DMV in SQL Server 2005 #63. sys.dm_os_workers

DMV in SQL Server 2005 #64. sys.dm_qn_subscriptions

DMV in SQL Server 2005 #65. sys.dm_repl_articles

DMV in SQL Server 2005 #66. sys.dm_repl_schemas

DMV in SQL Server 2005 #67. sys.dm_repl_tranhash

DMV in SQL Server 2005 #68. sys.dm_repl_traninfo

DMV in SQL Server 2005 #69. sys.dm_tran_active_snapshot_database_transactions

DMV in SQL Server 2005 #70. sys.dm_tran_active_transactions

DMV in SQL Server 2005 #71. sys.dm_tran_current_snapshot

DMV in SQL Server 2005 #72. sys.dm_tran_current_transaction

DMV in SQL Server 2005 #73. sys.dm_tran_database_transactions

DMV in SQL Server 2005 #74. sys.dm_tran_tran_locks

DMV in SQL Server 2005 #75. sys.dm_tran_session_transactions

DMV in SQL Server 2005 #76. sys.dm_tran_top_version_generators

DMV in SQL Server 2005 #77. sys.dm_tran_transactions_snapshot

DMV in SQL Server 2005 #78. sys.dm_tran_version_store

New DMV in SQL Server 2008

DMV in SQL Server 2008 #1. sys.dm_audit_actions

DMV in SQL Server 2008 #2. sys.dm_audit_class_type_map

DMV in SQL Server 2008 #3. sys.dm_cdc_errors

DMV in SQL Server 2008 #4. sys.dm_cdc_log_scan_sessions

DMV in SQL Server 2008 #5. sys.dm_cryptographic_provider_properties

DMV in SQL Server 2008 #6. sys.dm_database_encryption_keys

DMV in SQL Server 2008 #7. sys.dm_db_mirroring_auto_page_repair

DMV in SQL Server 2008 #8. sys.dm_db_mirroring_past_actions

DMV in SQL Server 2008 #9. sys.dm_db_persisted_sku_features

DMV in SQL Server 2008 #10. sys.dm_db_script_level

DMV in SQL Server 2008 #11. sys.dm_exec_procedure_stats

DMV in SQL Server 2008 #12. sys.dm_exec_trigger_stats

DMV in SQL Server 2008 #13. sys.dm_filestream_file_io_handles

DMV in SQL Server 2008 #14. sys.dm_filestream_file_io_requests

DMV in SQL Server 2008 #15. sys.dm_fts_fdhosts

DMV in SQL Server 2008 #16. sys.dm_fts_outstanding_batches

DMV in SQL Server 2008 #17. sys.dm_os_dispatcher_pools

DMV in SQL Server 2008 #18. sys.dm_os_dispatchers

DMV in SQL Server 2008 #19. sys.dm_os_memory_brokers

DMV in SQL Server 2008 #20. sys.dm_os_memory_node_access_stats

DMV in SQL Server 2008 #21. sys.dm_os_memory_nodes

DMV in SQL Server 2008 #22. sys.dm_os_nodes

DMV in SQL Server 2008 #23. sys.dm_os_process_memory

DMV in SQL Server 2008 #24. sys.dm_os_spinlock_stacks

DMV in SQL Server 2008 #25. sys.dm_os_sys_memory

DMV in SQL Server 2008 #26. sys.dm_resource_governor_configuration

DMV in SQL Server 2008 #27. sys.dm_resource_governor_resource_pools

DMV in SQL Server 2008 #28. sys.dm_resource_governor_workload_groups

DMV in SQL Server 2008 #29. sys.dm_server_audit_status

DMV in SQL Server 2008 #30. sys.dm_tran_commit_table

DMV in SQL Server 2008 #31. sys.dm_xe_map_values

DMV in SQL Server 2008 #32. sys.dm_xe_object_columns

DMV in SQL Server 2008 #33. sys.dm_xe_objects

DMV in SQL Server 2008 #34. sys.dm_xe_packages

DMV in SQL Server 2008 #35. sys.dm_xe_session_event_actions

DMV in SQL Server 2008 #36. sys.dm_xe_session_events

DMV in SQL Server 2008 #37. sys.dm_xe_session_object_columns

DMV in SQL Server 2008 #38. sys.dm_xe_session_targets

DMV in SQL Server 2008 #39. sys.dm_xe_sessions

From: http://www.ravikhanal.com/list-of-dmv-in-sql-server-2005-and-2008/

Some helpfull Queries

Wed, 12 Oct 2011 10:00:11 +0100

select 'DBCC Show_Statistics ('''+obje.name+''','''+ind.name+''')' from sysindexes ind
Cross Apply(select name from sys.objects obj where obj.object_id = ind.id and obj.type not like 'S' ) obje

Create Query for all available indexes in table. Execute result set to check Stats on index. Stats update on index in very important for performance of table to retrieve data. Technical: Every time any DML Operation is performed, Index structure is impacted. So it's prefered to update Stats in regular interval of Time. Note: Having lot many indexes on table implacts DML operations.

use master
Go
sp_msforeachdb 'Use ?;Select ''?'' as DatabaseName,* from sys.objects where name like ''DateToInt'''

This query helps to find all database for function name.

use master
go
sp_msforeachdb 'Use ?;Select ''?'',* from information_schema.tables where table_name like ''nrmSalesActivations'''

Search all database for table name.

use master
go
sp_msforeachdb 'Use ?;Select ''?'',Table_name,Column_Name from information_schema.columns where table_name like ''adate'''

Search all database for column names.

SELECT name AS "Name",
    is_auto_create_stats_on AS "Auto Create Stats",
    is_auto_update_stats_on AS "Auto Update Stats",
    is_read_only AS "Read Only"
FROM sys.databases
WHERE database_ID > 4;
GO

All tables in all database for which autocreate stats and update stats are enabled.

SQL Server 2008 Missing Indexes

Wed, 12 Oct 2011 09:52:38 +0100

Have ever wondered/concerned what columns are being used mostly. Which tables are queried mostly? whats the number of hits on table? and other concerns related to performance of server.

When it comes to performance tuning we all think of Clustered Index, table partitions, Non Clustered Index, Data retention policy, relationships. In addition to above concern below is list of information I have found in my way of performance tuning.

By reading articles from internet that there are two ways of improving performance of Production server.

1) Creating TempDB file for each core processor on server

2) Don't change default configuration of Database options, unless knowing what you are doing.

3) Below script from Microsoft is handy in identifying indexed in already setup and running production environment.

SELECT migs.group_handle,Migs.user_seeks,migs.avg_user_impact, mid.*

FROM sys.dm_db_missing_index_group_stats AS migs

INNER JOIN sys.dm_db_missing_index_groups AS mig

ON (migs.group_handle = mig.index_group_handle)

INNER JOIN sys.dm_db_missing_index_details AS mid

ON (mig.index_handle = mid.index_handle) order by user_seeks desc

4) Using Activity Monitor in SQL Server 2008 give fair information on Server load, CPU Usage.
5) Standard reports like server dashboard provides information on Server utilization, but not expensive queries.

In course of time there is one flaw, all queries are not visible in Activity monitor. Using DMV helps in this case. I still need to work on query using DMV to list all active queries.

6) One of Database option is Auto Update Statistics, its good to leave this option enabled. Based on frequency and status of stats it would get updated.
Sp that helps to update all statistics. I recomend running it after creating tempdb files if you have not got one.

Update Statistics in Database

EXEC sp_updatestats

Windows 7 cannot load Userprofile

Tue, 11 Jan 2011 02:58:10 +0100

Hi,
If you ever find any difficulty with Windows 7 login with error message: Windows cannot load User profile.

Trick is to just follow instructions on this link. It helped me fix issues on my computer. Hopefully if you every get into this issue, this might get fixed.

Link: http://social.answers.microsoft.com/Forums/en-US/w7security/thread/9d5c317b-5e16-42ae-9a86-f8ae85761803?prof=required

Regards,
Rajesh

2005 SSAS Range Operator

Wed, 15 Dec 2010 15:17:24 +0100

Hi,

In SSAS 2005 MDX we have Range function. This function is very good for any data which is sequential and good for some in some scenario like Date range.

Unfortunately we can't use the same for Amount data like >=50 and <=100. When you have such requirement, I would suggest using Exists function instead of Range operation. In addition using Exists will help using same hierarchy twice once for Min and second for Max.

Will update this post soon with more details.

Keep reading,
Raj