A method for online charging, comprising: parsing an acquired credit control request, CCR, to obtain an event type, a usage quota, and charging identifier information, wherein the usage quota comprises a used quota and/or a quota applied for; sending a data load request to a data center, wherein the data load request carries the event type and the charging identifier information; receiving subscriber data information that is returned by the data center and related to the event type and the charging identifier information, wherein the related subscriber data information comprises all subscriber data information required for rating and debiting the usage quota; performing rating and debiting according to the usage quota and the related subscriber data information; and returning operation information about a change operation performed for the related subscriber data information during the debiting process to the data center, characterized by comprising: wherein the operation information is specifically a structured query language, SQL, operation instruction for performing a change operation for the related subscriber data information; and the returning operation information about a change operation performed for the related subscriber data information during the debiting process to the data center is specifically: aggregating the SQL operation instruction for performing a change operation for the related subscriber data information during the debiting process; and returning the aggregated SQL operation instruction to the data center. parsing an acquired credit control request, CCR, to obtain an event type, a usage quota, and charging identifier information, wherein the usage quota comprises a used quota and/or a quota applied for; sending a data load request to a data center, wherein the data load request carries the event type and the charging identifier information; receiving subscriber data information that is returned by the data center and related to the event type and the charging identifier information, wherein the related subscriber data information comprises all subscriber data information required for rating and debiting the usage quota; performing rating and debiting according to the usage quota and the related subscriber data information; and returning operation information about a change operation performed for the related subscriber data information during the debiting process to the data center, characterized by comprising: wherein the operation information is specifically a structured query language, SQL, operation instruction for performing a change operation for the related subscriber data information; and the returning operation information about a change operation performed for the related subscriber data information during the debiting process to the data center is specifically: aggregating the SQL operation instruction for performing a change operation for the related subscriber data information during the debiting process; and returning the aggregated SQL operation instruction to the data center. wherein the operation information is specifically a structured query language, SQL, operation instruction for performing a change operation for the related subscriber data information; and the returning operation information about a change operation performed for the related subscriber data information during the debiting process to the data center is specifically: aggregating the SQL operation instruction for performing a change operation for the related subscriber data information during the debiting process; and returning the aggregated SQL operation instruction to the data center. aggregating the SQL operation instruction for performing a change operation for the related subscriber data information during the debiting process; and returning the aggregated SQL operation instruction to the data center.