title: Copy activity queued for a long time
body: <p>I have a pipeline with a Copy activity which copies data from a folder in ADLS Gen2 with Parquet files to a table in Azure SQL Database. Sometimes the Copy activity is in status Queued for several minutes before the actual copy of data occurs and then succeeds. The Copy activity has a pre-copy script setting for the Sink that truncates the table before copying the data. Why is the Copy activity queued for a long time before copying the data? Can it be due to some lock in the database, i.e. that some query is reading from the table?</p>