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Message type to initiate a read-only transaction.
Read at a timestamp where all previously committed transactions are visible.
Read data at a timestamp >= NOW - max_staleness
seconds.
Guarantees that all writes that have committed more than the
specified number of seconds ago are visible. Because Cloud
Spanner chooses the exact timestamp, this mode works even if
the client’s local clock is substantially skewed from Cloud
Spanner commit timestamps. Useful for reading the freshest
data available at a nearby replica, while bounding the
possible staleness if the local replica has fallen behind.
Note that this option can only be used in single-use
transactions.
Executes all reads at a timestamp that is exact_staleness
old. The timestamp is chosen soon after the read is started.
Guarantees that all writes that have committed more than the
specified number of seconds ago are visible. Because Cloud
Spanner chooses the exact timestamp, this mode works even if
the client’s local clock is substantially skewed from Cloud
Spanner commit timestamps. Useful for reading at nearby
replicas without the distributed timestamp negotiation
overhead of max_staleness
.