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Finding and removing hidden characters in your data using dynamic T-SQL
Today I was struggling with one issue which keeps my SSIS package failing in one of the data imports.And came across one of the blog. The problem was a conversion problem from varchar type to float and I kept getting the following error:
Msg 8114, Level 16, State 5, Line 1
Error converting data type varchar to float.
However, my data was numeric I checked it many times… or was it really 100% numeric?
Apparently there are some crazy hidden characters that you cannot see when you just glimpse at data. One of the best ways to find out if your data has some non-numeric characters in it is by running a simple query.
SET QUOTED_IDENTIFIER ON/OFF and SET ANSI_NULLS ON/OFF
Most of us use those statements while creating stored procedures and functions. most of us don’t know what is the significance of those statements and how they are useful.
SET QUOTED_IDENTIFIER ON/OFF
Understand Response Time vs. Total Time in SQL
Response time is the time it takes for a query to return the first record. Total time is the time it takes for the query to return all records. For an interactive application, response time is important because it is the perceived time for the user to receive visual affirmation that a query is being processed. For a batch application, total time reflects the overall throughput. You have to determine what the performance criteria are for your application and queries, and then design accordingly.
How to achieve Parallelism in SSIS
SQL Server Integration Services (SSIS) allows parallel execution in two different ways
1) MaxConcurrentExecutables : It defines how many tasks (executables) can run simultaneously. It defaults to -1 which is translated to the number of processors plus 2. Please note that if your box has hyperthreading turned on, it is the logical processor rather than the physically present processor that is counted. Read more…
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