troubleshooting Question

Improve speed of cursor

Avatar of gdinunzio
gdinunzio asked on
Microsoft SQL Server
13 Comments2 Solutions77 ViewsLast Modified:
I have an SSIS ETL process in which i use the multiple flat file connection to create 2 main tables:
  • DE_MASTER
  • DE_MASTER_ARCHIVE

I then have a cursor to union these 2 tables in SELECT Statement.  In the SELECT statement i am selecting most (almost all) of the columns.  This cursor populates other normalized tables, so the source tables are essentially read only after the ETL process is done.

My question is:

How can i improve the performance of this SELECT?  The union of the 2 tables produces about 3m rows and takes about 15 mins
There are no indexes on each of the source tables in the union.
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