如何比较来自不同数据库的两个表

Question

I have two databases, SqlServer 2016 & Oracle 10 (mirror replication).

I want to compare two the same tables from different databases without getting all data from tables on client.

Eg: I have two huge tables (size > 500 MB) how can I do it ? Maybe anywhere has some algorithms which do it ...

PS I have implemented some algorithm but speed of works this algorithm too slowly and work accuracy very low.

Answer 1

You can use OPENROWSET to connect to Oracle from SQL Server

select * from
OPENROWSET('OraOLEDB.Oracle','<tnsname>';'someuser';'somepassword', 
'SELECT * FROM schema.table_to_compare') A 
FULL JOIN sqlserver.table_to_compate B
ON A.field = B.field