When Transaction Identification is enabled on DB Definitions you can set this field to specify the maximum number of records updated per Update SQL command.
The Transaction Identification function records the primary key values of all transactions process, and at the end of processing using these primary key values to update the flag field. This update is done through a SQL statement that uses an In clause with a comma separated list of primary key values. An example of the update command is;
update table set flagfield=flagvalue where primarykeyfield in (1,2,3)
Some databases have a limit to the number of values you can include in the In clause. This setting will allow you to break the update statement into multiple statements, with each one having the specified number of transactions per statement.