Module: Google::Cloud::Spanner::V1::TransactionOptions::ReadWrite::ReadLockMode

Defined in:

proto_docs/google/spanner/v1/transaction.rb

Overview

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

Constant Summary

READ_LOCK_MODE_UNSPECIFIED =

Default value.

If the value is not specified, the pessimistic read lock is used.

0

PESSIMISTIC =

Pessimistic lock mode.

Read locks are acquired immediately on read.

1

OPTIMISTIC =

Optimistic lock mode.

Locks for reads within the transaction are not acquired on read. Instead the locks are acquired on a commit to validate that read/queried data has not changed since the transaction started.

2