Google Cloud Spanner v1 API - Enum TransactionOptions.Types.ReadWrite.Types.ReadLockMode (5.13.0-beta06)

public enum TransactionOptions.Types.ReadWrite.Types.ReadLockMode

Reference documentation and code samples for the Google Cloud Spanner v1 API enum TransactionOptions.Types.ReadWrite.Types.ReadLockMode.

ReadLockMode is used to set the read lock mode for read-write transactions.

Namespace

Google.Cloud.Spanner.V1.dll

Fields
Name	Description
`Optimistic`	Optimistic lock mode. Lock acquisition behavior depends on the isolation level in use. In both [SERIALIZABLE][google.spanner.v1.TransactionOptions.IsolationLevel.SERIALIZABLE] and [REPEATABLE_READ][google.spanner.v1.TransactionOptions.IsolationLevel.REPEATABLE_READ] isolation, reads and writes do not acquire locks during transaction statement execution. See Concurrency control for details on how the guarantees of each isolation level are provided at commit time.
`Pessimistic`	Pessimistic lock mode. Lock acquisition behavior depends on the isolation level in use. In [SERIALIZABLE][google.spanner.v1.TransactionOptions.IsolationLevel.SERIALIZABLE] isolation, reads and writes acquire necessary locks during transaction statement execution. In [REPEATABLE_READ][google.spanner.v1.TransactionOptions.IsolationLevel.REPEATABLE_READ] isolation, reads that explicitly request to be locked and writes acquire locks. See Concurrency control for details on the types of locks acquired at each transaction step.
`Unspecified`	Default value. If isolation level is [SERIALIZABLE][google.spanner.v1.TransactionOptions.IsolationLevel.SERIALIZABLE], locking semantics default to `PESSIMISTIC`. If isolation level is [REPEATABLE_READ][google.spanner.v1.TransactionOptions.IsolationLevel.REPEATABLE_READ], locking semantics default to `OPTIMISTIC`. See Concurrency control for more details.