Unfortunately a common error in many of our client environments is this:
Error: 8623, Severity: 16, State: 1.
The query processor ran out of internal resources and could not produce a query plan. This is a rare event and only expected for extremely complex queries or queries that reference a very large number of tables or partitions. Please simplify the query. If you believe you have received this message in error, contact Customer Support Services for more information.–There are many potential causes for this, and the text of this particular error is very well-written because the primary cause is exactly what is listed – a complex query.
Read on to see how to find this complex query, as well as a few examples of complex queries.