Driving table and driver table in oracle

 · Oracle reads a record in the driving table and then tries to find matching records (determined by the join condition) in the other table. In older versions of Oracle (pre-9i), the driving table was the first table in the FROM clause. You could also specify the driving table with the use of optimizer hints. In Oracle 9i and 10g, the Cost-Based Optimizer chooses the driving table. The order in the Author: Techtarget. Driving tables are for use in optimizing the manner in which the Oracle BI Server processes OBIEE - Federated Query / Multi-Database or Cross-Database Join when one table is very small and the other table is very large. The BI Server will query the driving table (the small one) and will get a list of values. The BI Server will then gen.  · Main hints that control driving tables. The main hints that control the driving table of a SQL statement include: FULL(table [table] ) ORDERED (being depreciated, may still work) LEADING(table [table] ) USE_NL(table table) USE_MERGE(table table) USE_HASH(table table) The ORDERED hint gives the user the ability to shuffle the tables on the FROM www.doorway.ruted Reading Time: 2 mins.

Oracle also uses the term driving table when talking about the driving table in a hash join. Make sure that the smaller table is the driving table (the first table in the from clause when using the ordered hint). This is because a hash join builds the memory array using the driving table. Oracle recommends that the hash_area_size for the driving table be set at times the sum of bytes for the driving table, and you can use the hash_www.doorway.ru script to set the hash_area_size for your query. Oracle reads a record in the driving table and then tries to find matching records (determined by the join condition) in the other table. In older versions of Oracle (pre-9i), the driving table was the first table in the FROM clause. You could also specify the driving table with the use of optimizer hints. Specifying a Driving Table. You can specify a driving table for logical joins from the Logical Joins window. Driving tables are for use in optimizing the manner in which the Oracle BI Server processes cross-database joins when one table is very small and the other table is very large. Specifying driving tables leads to query optimization only when the number of rows being selected from the driving table is much smaller than the number of rows in the table to which it is being joined.

26 Copying data from an Oracle table to a SQL Server table is not as After this, I will have all www.doorway.ru drivers installed under in my. 27 In Oracle, the driving table is the table that is joined to other tables in an SQL query. Understanding how Oracle identifies the driving. Learn how to copy a table with and without data in the same Oracle database and between different database schemas using dbForge Studio for Oracle!