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What is Dataflow in SSIS?
The Data Flow task encapsulates the data flow engine that moves data between sources and destinations, and lets the user transform, clean, and modify data as it is moved. Addition of a Data Flow task to a package control flow makes it possible for the package to extract, transform, and load data.
What are the components of SSIS?
Following are components of SSIS architecture:
- Control Flow (Stores containers and Tasks)
- Data Flow (Source, Destination, Transformations)
- Event Handler (sending of messages, Emails)
- Package Explorer (Offers a single view for all in package)
- Parameters (User Interaction)
How does SSIs allocate memory in the runtime?
SSIS will allocate memory from the unallocated system memory for each package executed, and surrenders that memory shortly after the package completes its execution. The memory allocated for SSIS package executions runs in the SSIS execution runtime process ( ISServerExec.exe , if you are executing the package from the SSIS catalog).
What to do when SSIS is out of memory?
SSIS has to fight for memory allocated outside of SQL server which is usually very less on a dedicated SQL box. To control the buffer size and number of rows in each buffer you can use the DefaultMaxBufferSize and DefaultMaxBufferRows property in the dataflow task.
How does SQL Server integration services use memory?
When planning for memory needs, it is critical to understand how SQL Server Integration Services uses memory. SSIS will allocate memory from the unallocated system memory for each package executed, and surrenders that memory shortly after the package completes its execution.
Why is SSIs not included in SQL Server Max?
I just leave enough memory for OS, since DTExec.exe is an external process to sqlserver.exe and so its memory requirements wont be included as part of MAX Memory. Also, SSIS is designed to process large amounts of data row by row in memory with high speed.