Finding Cross Database Dependencies

We recently went through a database consolidation project for a legacy application and needed to find object dependencies across multiple databases. While SQL Server provides some fantastic tools in SQL Server Management Studio and DMVs for finding dependencies, they are all unfortunately scoped to a single database. The following procedure will iterate through all the databases on a particular server and generate a report of all object dependencies intra-database, inter-database, and inter-server (via Linked Servers).

CREATE PROCEDURE [dbo].[get_crossdatabase_dependencies] AS

SET NOCOUNT ON;

CREATE TABLE #databases(
    database_id int, 
    database_name sysname
);

-- ignore systems databases
INSERT INTO #databases(database_id, database_name)
SELECT database_id, name FROM sys.databases
WHERE database_id > 4;	

DECLARE 
    @database_id int, 
    @database_name sysname, 
    @sql varchar(max);

CREATE TABLE #dependencies(
    referencing_database varchar(max),
    referencing_schema varchar(max),
    referencing_object_name varchar(max),
    referenced_server varchar(max),
    referenced_database varchar(max),
    referenced_schema varchar(max),
    referenced_object_name varchar(max)
);

WHILE (SELECT COUNT(*) FROM #databases) > 0 BEGIN
    SELECT TOP 1 @database_id = database_id, 
                 @database_name = database_name 
    FROM #databases;

    SET @sql = 'INSERT INTO #dependencies select 
        DB_NAME(' + convert(varchar,@database_id) + '), 
        OBJECT_SCHEMA_NAME(referencing_id,' 
            + convert(varchar,@database_id) +'), 
        OBJECT_NAME(referencing_id,' + convert(varchar,@database_id) + '), 
        referenced_server_name,
        ISNULL(referenced_database_name, db_name(' 
             + convert(varchar,@database_id) + ')),
        referenced_schema_name,
        referenced_entity_name
    FROM ' + quotename(@database_name) + '.sys.sql_expression_dependencies';

    EXEC(@sql);

    DELETE FROM #databases WHERE database_id = @database_id;
END;

SET NOCOUNT OFF;

SELECT * FROM #dependencies;