Patent ID: 8924429

Claim:
A computer system configured to obtain changed data from a data source, the computer system comprising: one or more hardware computer processors configured to execute code in order to cause the system to: obtain information indicating a plurality of groupings of data of a data source, the information indicating a number of data items included in each of the plurality of groupings; determine a first grouping of the plurality of groupings including one or more data items that have changed by comparing a first number of data items included in the first grouping and a historical number of data items included in each of the plurality of groupings; access data items included in the first grouping from the data source; compare the data items included in the first grouping to data items of a corresponding local version of the first grouping to determine which data items of the first grouping from the data source have changed, wherein the corresponding local version of the first grouping of data items is a compressed version of the first grouping of data items; extract the changed data items of the first grouping; and forward the extracted changed data items to a destination system.