The integrity of the /var/adm/acct/sum/tacct file is important if you are charging users for system resources. Occasionally, unusual tacct records appear with negative numbers, duplicate user IDs, or a user ID of 65535. First, check the /var/adm/acct/sum/tacctprev file by using the prtacct script to print it. If the contents look all right, patch the latest /var/adm/acct/sum/tacctMMDD file, then recreate the /var/adm/acct/sum/tacct file. The following steps outline a simple patch procedure.