Sql-server – How to insert into a Destination Table from multiple tables concurrently..

You don't have sufficient disk space to process everything you're trying to do concurrently. Data flow operations that spill to disk and temp files that get created are just some of the many reasons you might run out of space.

You should be able to run Perfmon during one of these runs to see how disk space and activity play out.

It's next to impossible for us to recommend anything without intimate knowledge of your system. The fact you're running several processes concurrently - where the actual speed and state of each process can vary widely from run to run - makes it impossible to know when or why the processes are encountering the "perfect storm" of starving each other of disk space.

You will have to understand the resource usage of each one of your processes independently then you'll be able to know if you should even try to run them concurrently.

Time taken would depend on

• Row length
• Network Bandwidth
• Available resources on the source DB server
• And finally on data volume, as in number of rows

To put things in perspective - I recently did a similar migration. A table with 40 columns ( a mix on nvarchar and numeric) and 3 million rows of data took 35 minutes, where as another table with 7.5 million rows of data ( again a mix of nvarchar and numeric), but with 104 columns took more than 7 hours.

Conversely, a third table with 18 million rows of data, 6 columns, all numeric took 14 minutes. It is impossible to answer this question with Yes or No, with the information provided.

Raj