You can enable uncommitted read in tsqda, ODBC, DB2, Oracle, and so on.
To enable uncommitted read in tsqda:
Open the configuration file.
For Data Adapter, open Data Adapter\etc\config.txt
For ODBC, open ODBC Adapter\etc\config.txt
For other loader connections, for example, DB2 or Oracle, open MBSW\17\etc\config.txt
Modify the uncommitted_read parameter of the key rdbms section:
key rdbms { value uncommitted_read "on" value records_read 100 value records_read_odbc 1 }
Save your changes.