我是 TimeScaleDB 的新手,我创建了一个连续的聚合视图
CREATE MATERIALIZED VIEW minute_data
WITH (timescaledb.continuous)
AS
SELECT
time_bucket('1 min', time_stamp) as bucket,
thing_key,
avg(pulse_l) as avg_pulse_l,
avg(pulse_h) as avg_pulse_h,
max(pulse_l) as max_pulse_l,
max(pulse_h) as max_pulse_h,
min(pulse_l) as min_pulse_l,
min(pulse_h) as min_pulse_h,
count(thing_key) as counts,
sum(pulse_l) as sum_pulse_l,
sum(pulse_h) as sum_pulse_h
FROM
water_meter
GROUP BY thing_key, bucket
WITH NO DATA;
我为此视图创建了刷新策略:
SELECT add_continuous_aggregate_policy('minute_data',
start_offset => INTERVAL '1 day',
end_offset => INTERVAL '1 hour',
schedule_interval => INTERVAL '1 minute');
即使将结束偏移量设置为 1 小时后,我也会获得最新添加的数据。
刷新日志:
2021-07-14 08:09:39.597 UTC [1268] LOG: refreshing continuous aggregate "minute_data" in window [ 2021-07-13 08:10:00+00, 2021-07-14 07:09:00+00 ]
但是物化视图包含结束偏移之外的数据,虽然开始偏移设置工作正常
以下是物化视图中的数据: 物化视图
编辑:此外,我什至在政策刷新之前就获得了最新数据。