partitioning

问题 This question already has answers here : Split List into Sublists with LINQ (29 answers) Closed 6 years ago . How would one take a List (using LINQ) and break it into a List of Lists partitioning the original list on every 8th entry? I imagine something like this would involve Skip and/or Take, but I'm still pretty new to LINQ. Edit: Using C# / .Net 3.5 Edit2: This question is phrased differently than the other "duplicate" question. Although the problems are similar, the answers in this

问题 I am trying to write a Procedure which essentially drops partitions from several tables which are stored in multiple schemas. End goal is to then create a dbms scheduler which will run this procedure every day and check for partitions that hold data older than 6 months. How to add functionality of looking for partitions across multiple schemas ? I have created a Procedure which drops a partition only from a specific table. PROCEDURE purge_ops_log_range_parts IS BEGIN FOR partition_rec IN

问题 Background I currently have a spring-batch job that reads a flat file. The job uses a MultiResourcePartitioner to read physical partitions of a file that has been split into N number of smaller files. This means that each physical partition of the file will result in a new slave step being executed that reads the partition. The problem If there is any issue reading any physical partition, the execution of that slave step will fail and the exception will be logged by spring batch. This does

问题 Order by higher percentage matching checking 30 columns mysql I would like to make a profile matching project. The target is to return say 100 results matching better percentage first. the scenery is - A user has yes or no answer of 30 questions(all answered). User is interested to see 100 people who has matching with him order by higher percentage I need suggestion to decide how I will make the table and query ensuring minimum processing load - Should I store answers in separate columns

问题 I have a log_table in my db that is partitioned according to partitioning docs. I have a function that inserts records to partition table depending on date and a trigger that calls that function, like in the documentation. Trigger example CREATE TRIGGER insert_measurement_trigger BEFORE INSERT ON measurement FOR EACH ROW EXECUTE PROCEDURE measurement_insert_trigger(); Function example CREATE OR REPLACE FUNCTION measurement_insert_trigger() RETURNS TRIGGER AS $$ BEGIN IF ( NEW.logdate >= DATE

问题 I want to dynamically declare the range of my partition function. I don't want to hard-code the range value,like below: CREATE PARTITION FUNCTION PartFun(smallint)AS RANGE LEFT FOR VALUES (1,2,3,4,5) The problem is:The column(ID in IDMASTER table) on which I want to create partition is of smallint datatype. Declare @IDS NVARCHAR(100) SELECT @IDS = coalesce(@IDS + ', ', '') + CAST(a.ID AS VARCHAR) FROM (SELECT DISTINCT TOP 100 ID from IDMASTER ORDER BY ID ) a --PRINT @IDS --it prints 0,1,2,3,4

问题 I need to get all the records in TABLE_A where at least the 2 last Status are vacant (relative to Inspection_Date ) and the Room_ID does not exist in TABLE_B . This is a simplified table I am using as an example: TABLE_A : Room_Id Status Inspection_Date ------------------------------------- 1 vacant 5/15/2015 2 occupied 5/21/2015 2 vacant 1/19/2016 1 occupied 12/16/2015 4 vacant 3/25/2016 3 vacant 8/27/2015 1 vacant 4/17/2016 3 vacant 12/12/2015 3 vacant 3/22/2016 4 occupied 2/2/2015 4 vacant

问题 I am using Spring Batch for data migration from XML to Oracle Database. With Single Thread execution, process takes 80-90 Mins to insert 20K users approx. I want to reduce it to more than half but even using Multi File Resource, I am not able to achieve that. I have a single XML to be processed so I started simply by adding task executor and making Reader synchronized but not able to achieve gain. So what I am doing, I split XML into multiple XMLS and want to try with Multi File Resource.

问题 I want to extract CU/PU/TU partitioning data from HEVC HM encoder. I could extract CU/PU partitioning information using getHeight/getWidth/getPartitionSize functions in TComDataCU class. But, don't know how to access TU partitioning information. Please help. 回答1: You can do it easily on the decoder side. You need to find the function parseCoeffNxN and then access the TU size with uiWidth and uiHeight . Start with this simple test and then give feedbacks here. If there's a problem, we will

问题 I'm trying to understand how coalesce determines how to join initial partitions into final questions, and apparently the "preferred location" has something to do with it. According to this question, Scala Spark has a function preferredLocations(split: Partition) that can identify this. But I'm not at all familiar with the Scala side of Spark. Is there a way to determine the preferred location of a given row or partition ID at the PySpark level? 回答1: Yes, it is theoretically possible. Example