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Starts a sub-transaction specified by its parent's name.
function lr.start_sub_transaction( sub_transaction, parent_transaction )
Function lr.start_sub_transaction( sub_transaction, parent_transaction )
|Example: Sub-transactions||Transaction Functions|
|sub_transaction||The name of the sub-transaction|
|parent_transaction||The name of the parent transaction in which the sub-transaction is nested.|
The lr.start_sub_transaction function marks the beginning of a sub-transaction. To mark the end of the sub-transaction, use lr.end_sub_transaction. You insert these functions immediately before and after the sub-transaction actions.
Sub-transactions are used for isolating parts of a business process. For example, a sub-transaction "electrical_purchases" may be nested within the larger transaction "purchases." The transaction "purchases" is the parent transaction and "electrical_purchases" the sub-transaction.
Multiple sub-transactions can be nested within a parent transaction. A sub-transaction may also be a parent to a smaller sub–transaction.
The duration of a transaction or sub-transaction is the sum of the durations of all steps between its start and end, including the steps that are included in sub-transactions.
Each lr.start_sub_transaction statement must be matched with an lr.end_sub_transaction statement within the script or it will be interpreted as an illegal command.
Note: Do not use the period character (.) in a transaction or sub-transaction name. The period character delimits transactions and sub-transactions. In analysis, a transaction name with a period will be interpreted as two transactions.
On success, returns 0. Returns -1 if the transaction name is illegal or if there is no prior call to lr.start_transaction with a transaction of the same name.