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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2020/05/27 09:20:18 UTC
[GitHub] [incubator-iotdb] liwh1111 opened a new issue #1276: 你好,请问现在iotdb的时间是精确到毫秒级吗
liwh1111 opened a new issue #1276:
URL: https://github.com/apache/incubator-iotdb/issues/1276
你好, 我在测试时发现, 循环插入10000条数据, 时间用now(), 会丢很多数据, 查询数据库发现time在每毫秒都有数据, 一毫秒之内的其他数据好像都被覆盖了, 还能再往下精确吗? 如果可以, 该怎样操作呢.
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[GitHub] [incubator-iotdb] jixuan1989 edited a comment on issue #1276: 你好,请问现在iotdb的时间是精确到毫秒级吗 (What is the time precision unit of IoTDB? Can it be changed?)
Posted by GitBox <gi...@apache.org>.
jixuan1989 edited a comment on issue #1276:
URL: https://github.com/apache/incubator-iotdb/issues/1276#issuecomment-636560784
#1290 会解决这个问题，并在0.10中发布。
PR 1290 will solve the issue and be released in v0.10.0
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[GitHub] [incubator-iotdb] jixuan1989 commented on issue #1276: 你好,请问现在iotdb的时间是精确到毫秒级吗 (What is the time precision unit of IoTDB? Can it be changed?)
Posted by GitBox <gi...@apache.org>.
jixuan1989 commented on issue #1276:
URL: https://github.com/apache/incubator-iotdb/issues/1276#issuecomment-634542829
IoTDB默认使用毫秒， 但是其实IoTDB内部是用的long进行存储的，因此可以通过配置来支持微秒和纳秒。
在IoTDB配置文件(iotdb-engine.properties)中的如下配置:
```
# Use this value to set timestamp precision as "ms", "us" or "ns".
# Once the precision is been set, it can not be changed.
timestamp_precision=ms
```
这样的话，你传入一个long时间戳，就会将其按照微秒或者纳秒解读了。
不过目前的版本中 `now()`返回的是毫秒值， 所以如果将`timestamp_precision`设置为`us`或者`ns`，那么时间将来解析成人类可读的时间(yyyy-mm-dd HH:MM:ss)就会不太对。 这个会马上加PR修复。
By default, IoTDB considers a long timestamp as millisecond time unit, but you can change it in iotdb-engine.properties: `timestamp_precision=us` or `timestamp_precision=ns`.
But currently, `now()` function only returns `ms`.
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[GitHub] [incubator-iotdb] jixuan1989 commented on issue #1276: 你好,请问现在iotdb的时间是精确到毫秒级吗 (What is the time precision unit of IoTDB? Can it be changed?)
Posted by GitBox <gi...@apache.org>.
jixuan1989 commented on issue #1276:
URL: https://github.com/apache/incubator-iotdb/issues/1276#issuecomment-636560784
#1290 会解决这个问题，并在0.10中发布。
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