dup()

Here’s how to use dup() functions.

T.dup()

Description:

Join up a cluster in-memory table into a local in-memory table.

Syntax:

T.dup()

Note:

The function joins up cluster in-memory table T to generate a local in-memory table.

Parameter:

T	A cluster in-memory table

Return value:

An in-memory table

Example:

	A
1	=file("D:/test0.ctx","169.254.121.62:8281")	Open a cluster file.
2	=A1.open()	Return a cluster table.
3	=A2.attach(table)	Retrieve cluster table table.
4	=A3.memory()	Generate a cluster memory table.
5	=A4.dup()	Join up the cluster in-memory table to return a local in-memory table.

T.dup(h)

Description:

Copy a local in-memory table onto nodes to create a duplicate cluster in-memory table.

Syntax:

T.dup(h)

Note:

The function copies local in-memory table T onto node or node sequence h to create a duplicate cluster in-memory table. The memory footprints will be cleaned up once T.close() is executed.

Parameter:

T	A local in-memory table
h	A node or a node sequence

Return value:

A duplicate cluster in-memory table

Example:

	A
1	=demo.cursor("select EID,NAME,GENDER,SALARY from EMPLOYEE where EID<10")
2	=A1.memory()	Generate a local in-memory table.
3	=A2.dup("169.254.121.62:8281","192.168.31.165:8281")	Copy the local in-memory table into a duplicate cluster in-memory table.