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SQL Server Control Flow Elements

The organize flow in a SSIS wrap up is constructed by using dissimilar types of manages flow elements, just like Pot, Job and Priority constraints. In this article we will discuss about the details of control flow.

Precedence Constraints

Precedence constraints attach container and duty in letters into an arranged control flow.

We can manage the successful implementation for responsibilities and containers, and specify circumstances that conclude whether responsibilities and containers run.

Precedence restriction relations two executables:

  • The precedence executable and
  • The constrained executable.

The preference executable runs earlier than the constrained executable and the capital punishment result of the priority executable may decide whether the forced executable runs.

Execute SQL Tasks

The implement SQL task runs SQL statements or stored procedures form a package.

Implement SQL assignment can be worn for the subsequent functions.

  • Prune a tuple or view in arrangements for inserting information.
  • Create, alter and drop database substance such as tuples and views.
  • Re-create fact and measurement tale earlier than loading them.
  • Run stored procedures.

Bulk Insert Task

The mass include task provides the quickest method to copy big volumes of information into a SQL server tuple or view.

We can organize the mass include task in the subsequent ways.

  • Identify the OLE DB association manager to attach to the target SQL server database and tuple or view into which information is inserted.
  • identify the case or Flat File relationship manager to contact the foundation file.
  • Describe the arrangement used by the mass include duty.

File System Task

The File System job performs operations on files and directories in the file system.

  • All File System job operations employ a basis, which can be a file or a directory.
  • The operations that reproduction and go file and directories and rename file use purpose and a basis.

If we're something like us, we get a nauseous feeling in our abdomen when we're repetition a part of system in excess of and over once more, reusing it in dissimilar seats - we just know that it will move towards back and bite us, typically in the form of an unattractive, hairy beast, growling "copies not coordinated, psycho." I certainly felt it inhalation losing my collar when location up a standard newly; this topic is all about how to tame that monster - here's my unique preliminary point:

There are five responsibilities at the foundation (Simplex Benchmark to Scary Benchmark). All manufacture the equal end product, but do it in five dissimilar habits (I'll leave the details of that in another article.) The five responsibilities at the top despite the fact that (Read Tuples 1 to Read Tuples 5), they all do the correct similar things, that is understanding the similar two tuples from start to end - their principle is to provide each standard a convincingly dependable preliminary surroundings.

Copy and paste

Let's not fail to remember, copy&paste is the first level of code reclaim - the information that we can see with no trouble, select a numeral of mechanism and photocopy them anywhere else in our wrap up, or even in a different package, is a authentic timesaver, both at what time creating correct duplicates like on top of the screenshot, and whilst by means of it as a preliminary point for creating original functionality.

Simple for loop

It's informative to believe about for loops and for each loops as not immediately life form extremely helpful iterators of figures, files etc., but moreover as being awfully (common and) constructive conduct of reusing code.

Not so simple for loop

My for loop is configured to set the changeable Step to {1, 2, 3, 4, 5}, in that arrange. This will be the timepiece mark that makes our erect work, altering the manage flow in every occasion.

The concluding part is to pull the priority constraint from Read Tables to all of the benchmark everyday jobs, and after that double click each connection (or right click and "Edit...", or use the properties window to set the corresponding values) and arrange them like this, altering the figure to "1" through "5" for the five links.

When we run this, the execution order will be:

  • Read Tuples
  • 1. Simplex Benchmark
  • Read Tables
  • 2. Duplex Benchmark
  • Read Tables
  • 3. Complex Benchmark
  • Read Tables
  • 4. Huge Benchmark
  • Read Tables
  • 5. Scary Benchmark

At present this seems similar to an ideal fit for my difficulty in conditions of functionality and difficulty, so as long as I merely require this easy succession, this is what I'll use.

But necessities modify! What if I require running three standard farm duties in an additional multifaceted succession? Let's examine the details

Absolute compound and most excellent avoided for loop

Can it handle this?

  1. Complex standard
  2. Duplex standard
  3. Simplex standard in parallel with Duplex standard
  4. Simplex standard in parallel with Complex standard
  5. Duplex standard in parallel with Complex standard
  6. Complex standard
  7. Duplex standard

Now we have both repeating sequences of errands, and farm duties that from time to time run in succession, and occasionally in equivalent.

One method to do this is to start with the not so simple for loop, and add extra multifaceted precedence expressions:

  •  We have seven steps, so create the loop patchy Step go from 1 to 7
  • For every standard, check which stepladder it ought to run in, i.e. Complex standard runs in step 1, 4, 5, 6
  • For every standard, set the priority look to assess to true for the acknowledged steps, i.e. "@Step==1 || @Step>=4 || @Step<=6"

Getting silly for loop

In the preceding downright complex for loop we had our manage logic increased out and crossways many priority terminology. That's a great deal too simple to get incorrect, so let's refractor once more. Now we have centralized all the judgment in the solitary script called Logic, where we can arrange random manage flows:

To handle the complex sequence, construct it as follows:

  • Arrange the for loop to iterate Step from 1 to 7, resultant to our seven steps in the sequence. Also add a numeral variable BitMask to the for loop.
  • Name the yardstick tasks as 1, 2, 4 (continuing with 8, 16, 32, 64 etc. for any additional tasks)
  • Add system to the Logic script to set the bits in BitMask according to which pace in the series is execute - a set bit resources the matching standard task will carry out in the present pace:

Listing 1: Sample showing standard task

Enum Bits
      Simplexstandard = 1
      Duplexstandard = 2
      Complexstandard = 4
End Enum
Select Case CType(Dts.Variables("Step").Value, Integer)
  Case 1
    Dts.Variables("BitMask").Value = Bits.Complexstandard
  Case 2
    Dts.Variables("BitMask").Value = Bits.Duplexstandard
  Case 3
    Dts.Variables("BitMask").Value = Bits.Simplexstandard + Bits.Duplexstandard
  Case 4
    Dts.Variables("BitMask").Value = Bits.Simplexstandard + Bits.Complexstandard
  Case 5
    Dts.Variables("BitMask").Value = Bits.Duplexstandard + Bits.Complexstandard
  Case 6
    Dts.Variables("BitMask").Value = Bits.Complexstandard
  Case 7
    Dts.Variables("BitMask").Value = Bits.Duplexstandard
End Select

Set the precedence expressions for the three benchmark tasks to trigger when their corresponding bit in BitMask is set:

  • (@BitMask & 1) != 0
  • (@BitMask & 2) != 0
  • (@BitMask & 4) != 0

A brief review of the SSIS “Pipeline” Architecture

The main benefit of the SSIS structural design is the “pipeline”. The purpose is for the developer to go by the columns wanted for alteration and production from side to side the pipeline and to decrease the performance of columns in tuples. Secondly a most important characteristic of “pipeline” dispensation is so as to as a developer I can use transforms to crack and proactively readdress proceedings and get events on the soar and in reminiscence, also known as “pipeline”.

In organization to influence the “pipeline” a technique of analyzing columns and there values are desirable. Column psychoanalysis is more often than not talented by means of information profiling tools, hard coded queries or as provided in SQL 2008 information Profiling manage Flow. On the other hand these methods create tuples or intelligence and are not with no trouble obtainable in an SSIS information Flow.

SSIS information profiling by means of complete information Flow mechanism

I have worn a libretto constituent in the earlier period and consummate several of the “pipeline” profiling procedure.

Adaptive Cleansing

In a lot of cases a developer wants to be acquainted with the individuality or “profile” of a column and be clever to take proceedings on proceedings (cleaning, rejecting, and assign error) in a practical mode. Connotation that as I practice new inputs from side to side our information flow over time we will come across new errors for exact columns, and will desire to make sure the enclose runs and recognize any new anomalies in proceedings and processes them fruitfully.


All the database substances are necessary to be scripted, in sort to keep them beneath foundation manage. So, when on earth the database arrangement is tailored or writing has been efficient, the only method to reproduce the changes in the basis manage is to draft the file and keep informed the changes. Use of source control characteristic for database objects is not pertinent. I hope you have understood the concepts of control flow and implement it in your applications. Enjoy reading in mrbool.

Website: www.techalpine.com Have 16 years of experience as a technical architect and software consultant in enterprise application and product development. Have interest in new technology and innovation area along with technical...

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