Each Dynamic Data Masking client occupies an open file resource to connect to the Dynamic Data Masking Server. In addition, each connection from the Dynamic Data Masking Server to the database occupies an open file resource. Because Dynamic Data Masking requires a large number of resources, you must edit the limits.conf file to increase the number of open file resources available to the Dynamic Data Masking user.

To check the open file descriptor limit, run the following shell command:

/proc/<Dynamic Data Masking process ID>/limits

Informatica recommends that you set the hard and soft open file descriptor limits to five times the maximum number of database connections that you create through Dynamic Data Masking. For example, if you create 400 connections through Dynamic Data Masking, you might set the open file descriptor limit to 2000.