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Trying to optimize a copy of table's content between two azure sql databases.

Currently, one DB has an external table setup:

CREATE EXTERNAL TABLE [dbo].[Database2_TableA] (
    [Col1] [varchar](100) NULL,
    [ColN] [varchar](200) NULL
)
    WITH (
    DATA_SOURCE = [Database2],
    SCHEMA_NAME = N'dbo',
    OBJECT_NAME = N'TableA'
    );

Then, inside a stored proc, this statement copies the data

insert into TableA1 select * from Database2_TableA

The table is large (lots of large columns and rows), and the copy takes too long.

Is there more efficient way of doing this?

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