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Module snapshot (3.40.1)
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Model a set of read-only queries to a database as a snapshot.
Classes
Snapshot(
session,
read_timestamp=None,
min_read_timestamp=None,
max_staleness=None,
exact_staleness=None,
multi_use=False,
)
Parameters Name Description session
Session
The session used to perform the commit.
read_timestamp
datetime.datetime
Execute all reads at the given timestamp.
min_read_timestamp
datetime.datetime
Execute all reads at a timestamp >= min_read_timestamp
.
max_staleness
datetime.timedelta
Read data at a timestamp >= NOW - max_staleness
seconds.
exact_staleness
datetime.timedelta
Execute all reads at a timestamp that is exact_staleness
old.
multi_use
bool
If true, multiple read
/ execute_sql
calls can be performed with the snapshot in the context of a read-only transaction, used to ensure isolation / consistency. Incompatible with max_staleness
and min_read_timestamp
.
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Last updated 2023-09-02 UTC.
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