简单更新命令导致SqlException Execution Timeout Expired

I have an application which converts a mssql-db (source) to another mssql-db (target). For every table in my source i basically get all rows and make an insert for every row to my target. I run a simple query which updates the source-row to store the target-table and target-id of the records which get inserted to the target-db:I have an application which converts a mssql-db