partitioning

问题 I would like to optimise my Azure Cosmos DB SQL API queries for consumed RUs (in part in order to reduce the frequency of 429 responses). Specifically I thought that including the partition key in WHERE clauses would decrease consumed RUs (e.g. I read https://docs.microsoft.com/en-us/azure/cosmos-db/optimize-cost-queries and https://docs.microsoft.com/en-us/azure/cosmos-db/partitioning-overview which made me think this). However, when I run SELECT TOP 1 * FROM c WHERE c.Field = "some value"

问题 I am writing a custom Presto Aggregation Function that produces the correct result if (and only if) the values are ordered in ascending order by the value that I am aggregating on. i.e. The following will work: SELECT key, MY_AGG_FUNC(value ORDER BY value ASC) FROM my_table GROUP BY key The following will yield an incorrect result: SELECT key, MY_AGG_FUNC(value) FROM my_table GROUP BY key When developing the MY_AGG_FUNC , is there a way to enforce ORDER BY value ASC internally without relying

问题 What is the optimal size for external table partition? I am planning to partition table by year/month/day and we are getting about 2GB of data daily. 回答1: Optimal table partitioning is such that matching to your table usage scenario. Partitioning should be chosen based on: how the data is being queried (if you need to work mostly with daily data then partition by date). how the data is being loaded (parallel threads should load their own partitions, not overlapped) 2Gb is not too much even

问题 What is the optimal size for external table partition? I am planning to partition table by year/month/day and we are getting about 2GB of data daily. 回答1: Optimal table partitioning is such that matching to your table usage scenario. Partitioning should be chosen based on: how the data is being queried (if you need to work mostly with daily data then partition by date). how the data is being loaded (parallel threads should load their own partitions, not overlapped) 2Gb is not too much even

来源： https://stackoverflow.com/questions/62155325/how-to-index-coordinate-data-according-to-a-grid-in-r

来源： https://stackoverflow.com/questions/62155325/how-to-index-coordinate-data-according-to-a-grid-in-r

来源： https://stackoverflow.com/questions/55162738/python-finding-all-possible-partitions-of-a-list-of-lists-subject-to-a-size-li

来源： https://stackoverflow.com/questions/56244720/what-is-the-difference-between-mysql-drop-partition-and-truncate-partition

来源： https://stackoverflow.com/questions/63572210/how-spark-handles-out-of-memory-error-when-cached-memory-only-persistence-data

来源： https://stackoverflow.com/questions/63698573/update-column-from-one-to-many-join-with-datetime