# Striim 3.9.7 documentation

#### WAEvent contents for change data

The output data type for sources that use change data capture readers is WAEvent. The fields and valid values vary among the readers, but they all include the following:

metadata: a map including the elements:

• OperationName: INSERT, UPDATE, or DELETE

• TxnID: transaction ID

• TimeStamp: timestamp from the CDC log

• TableName: fully qualified name of the table on which the operation was performed

To retrieve the values for these fields, use the META() function. See Parsing the fields of WAEvent for CDC readers.

data: an array of fields, numbered from 0, containing:

• for an INSERT or DELETE operation, the values that were inserted or deleted

• for an UPDATE, the values after the operation was completed

To retrieve the values for these fields, use SELECT ... (DATA[]). See Parsing the fields of WAEvent for CDC readers.

before (for UPDATE operations only): the same format as data, but containing the values as they were prior to the UPDATE operation

dataPresenceBitMap, beforePresenceBitMap , and typeUUID are reserved and should be ignored.

For information on additional fields and detailed discussion of values, see: