I am confusing about operation id. Is it unique within the network or within a transaction?

In other words, will it be enough to store only OperationId in DB or should the Primary Key be a complex (TransactionId + OperationId)

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OperationId is unique within the network, so you need not to pair it with TransactionId. (TransactionId is also known as TransactionHash.)

You may consider OperationId a better choice for primary key, if the transactions contain more than one operation.

The operation details endpoint provides information on a single operation. The operation ID provided in the id argument specifies which operation to load. https://www.stellar.org/developers/horizon/reference/endpoints/operations-single.html

Example: https://horizon-testnet.stellar.org/operations/0002168464563249153

The Horizon operations endpoint returns just one operation (if found).


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