hive常用命令之analyze table命令简述. According to the Hive documentation the partition column and name need to be specified if you are analyzing a particular partition. This command will update statistics for all partitions for which partitioning key a is equal to 1 : The user has to explicitly set the boolean variable hive.stats.autogather to false so that statistics are not automatically computed and stored into Hive MetaStore. Partition keys are basic elements for determining how the data is stored in the table. This prompted us to build statistics collection into the QDS platform as an automated service. Size i… This developer built a…, Hive and Cassandra integration using CqlStorageHandler, unable to create hive table with primary key, hive spark Child process exited before connecting back, Getting error while creating hive table using “hive -e” but not in hive shell, Hive : getting parseexception in simple create external table query, Unable to create Hive table, flaky metastore connections, Column names with numbers in a file and creating hive table, Sci-fi film where an EMP device is used to disable an alien ship, and a huge robot rips through a gas station, Translation of lucis mortiat / reginae gloriae. set hive.compute.query.using.stats=true; set hive.stats.fetch.column.stats=true; set hive.stats.fetch.partition.stats=true; Then, prepare the data for CBO by running Hive’s “analyze” command to collect various statistics on the tables for which we want to use CBO. set hive.stats.autogather=false; 2. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Any way to compute statistics on a hive table for all partitions with a single analyze command? These tables can be created through either Impala or Hive. Since statistics collection is not automated, we considered the current solutions available to users to capture table statistics on an ongoing basis. These tables can be created through either Impala or Hive. access a hive table specifying database qualifier in spark 2.0, hive not using partition to select data in external table, How to resolve this erros “org.apache.spark.SparkException: Requested partitioning does not match the tablename table” in spark-shell, get latest data from hive table with multiple partition columns. 命令用法： 表与分区的状态信息统计ANALYZE TABLE tablename [PARTITION(partcol1[=val1], partcol2[=val2], ...)]COMPUTE STATISTICS [noscan]; 列信息统计ANALYZE TABLE tablename [PARTITION(par I am running the following code, hive --hiveconf hive.root.logger=DRFA --hiveconf hive.log.dir=./logs --hiveconf hive.log.level=ERROR -e "ANALYZE TABLE database.tablename PARTITION(Partition1, Partition2, Partition3, Partition4) COMPUTE STATISTICS FOR COLUMNS;", I am not sure why its complaining about the table missing when I am able to compute stats normally without the "for columns". ANALYZE TABLE [db_name. They went home" mean in Maya Angelou's "They Went Home"? The COMPUTE STATS statement works with Avro tables without restriction in CDH 5.4 / Impala 2.2 and higher. https://cwiki.apache.org/confluence/display/Hive/StatsDev#StatsDev-ExistingTables–ANALYZE Currently the command "analyze table .. partition .. compute statistics for columns" may only work for partition column type of string, numeric types, but not others like date. Hive: Any way to disable partition statistics? Statement type: DDL Depending upon whether you follow star schema or … Connect and share knowledge within a single location that is structured and easy to search. How does the strong force increase in attraction as particles move farther away? Is there any official/semi-official standard for music symbol visual appearance? Why is my neutral wire connected to a breaker? You can check it with hadoop fs -ls ${path_to_partition}. COMPUTE STATISTICS. How does the strong force increase in attraction as particles move farther away? HQL - How to Copy/Move data in few partitions from one table to another. Making statements based on opinion; back them up with references or personal experience. https://issues.apache.org/jira/browse/HIVE-4861, https://cwiki.apache.org/confluence/display/Hive/StatsDev, State of the Stack: a new quarterly update on community and product, Podcast 320: Covid vaccine websites are frustrating. The necessary changes to HiveQL are as below, analyze table t [partition p] compute statistics for [columns c,...]; Please note that table and column aliases are not supported in the analyze statement. I thought that should be reflected as rawDataSize. Why does every "defi" thing only support garbagecoins and never Bitcoin? I am on latest Hive 1.2 and the following command works very fine. To view column stats : Asking for help, clarification, or responding to other answers. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Do I have to relinquish my sign on and passwords for websites pertaining to work (ie: access to insurance companies and medicare)? Join Stack Overflow to learn, share knowledge, and build your career. So I would suggest including the partition_columns (but without the =vals). We have about a thousand partitions on this small table right now and it will be growing by orders of magnitude. Verify code signature of a package installer. Partitioning. To change the settings permanently you edit hive-site.xml file while to change settings for a particular session you use hive shell. The COMPUTE STATS statement works with Parquet tables. The MSCK REPAIR TABLE command scans a file system such as Amazon S3 for Hive compatible partitions that were added to the file system after the table was created.MSCK REPAIR TABLE compares the partitions in the table metadata and the partitions in S3. Just try partition spec syntax without specific values (no =… bits), If you're using FOR COLUMNS then you can't due to the bug: https://issues.apache.org/jira/browse/HIVE-4861, I am on latest Hive 1.2 and the following command works very fine, According to Hive manual if you do not specify partition specs statistics are gathered for entire table, 对于计算增量统计，它是可选的，对于删除增量统计，它是必需的。. Is it more than one pound? The Apache Hive Statisticswiki page contains a good background on the list of statistics that can be computed and stored in the Hive metastore. Are we spaghetti or flat blobs? COMPUTE STATISTICS [FOR COLUMNS]-- (Note: Hive 0.10.0 and later.) Asking for help, clarification, or responding to other answers. The same command could be used to compute statistics for one or more column of a Hive table or partition. Statement type: DDL 当您在COMPUTE INCREMENTAL STATS或DROP INCREMENTAL STATS语句中通过PARTITION (partition_spec)子句指定分区时，必须在规范中包含所 … Yes, I see that, but there is also this comment in same section: "When computing statistics across all partitions, the partition columns still need to be listed." delta.``: The location of an existing Delta table. We decided to put an explicit COMPUTE STATISTICS step at the end of our INSERT OVERWRITE query to set the correct stats on the output partitions. Detail about the implementation follows. What is the advantage of partitioning and bucketing Hive Table? table_name [PARTITION ( partition_spec )] （PARTITION）只允许分区子句与增量子句组合使用。. I don't understand why it is necessary to use a trigger on an oscilloscope for data acquisition. By running this query, you collect that information and store it in the Hive … How hard does atmospheric drag push on the ISS? The COMPUTE STATS statement works with partitioned tables, whether all the partitions use the same file format, or some partitions are defined through ALTER TABLE to use different file formats. hive > analyze table t partition (a, b) compute statistics for columns; It is also possible to update statistics for just a subset of partitions. Got a weird trans-purple cone part as extra in 71043-1 Hogwarts Castle, Stigma of virginity and chastity loophole. As discussed in the previous recipe, Hive provides the analyze command to compute table or partition statistics. Thanks for contributing an answer to Stack Overflow! table_identifier [database_name.] As of Hive 1.2.0 , Hive fully supports qualified table name in this command. [NOSCAN]; Number of rows 2. ]tablename COMPUTE STATISTICS FOR COLUMNS: Number of distinct values, NULL values, and TRUE and FALSE (BOOLEANS case). The following statistics are currently supported for partitions: 1. BTW I tried the following without specifying the partition: At least from hive v0.13 which I'm on. An optional parameter that specifies a comma-separated list of key-value pairs for partitions. This developer built a…. rev 2021.3.12.38768, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, hive compute stats for columns on a partition table fails, State of the Stack: a new quarterly update on community and product, Podcast 320: Covid vaccine websites are frustrating. Any help would be much appreciated as I am pulling my hair out on this one. Hive Partitions is a way to organizes tables into partitions by dividing tables into different parts based on partition keys. table_name. HiveQL currently supports the analyze commandto compute statistics on tables and partitions. The COMPUTE STATS statement works with partitioned tables, whether all the partitions use the same file format, or some partitions are defined through ALTER TABLE to use different file formats. [CACHE METADATA]-- (Note: Hive 2.1.0 and later.) Based on the motivations mentioned above, the issue of HIVE-33[2] created in Oct. 2008 aims at solving this problem, i.e., adding ability to compute statistics on Hive tables. The issue is divided into two sub-tasks. To learn more, see our tips on writing great answers. CREATE TABLE sales ( sales_order_id BIGINT, order_amount FLOAT, order_date STRING, due_date STRING, customer_id BIGINT ) PARTITIONED BY (country STRING, year INT, month INT, day INT) ; Join Stack Overflow to learn, share knowledge, and build your career. rev 2021.3.12.38768, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide, OK, i wrote the above when hive 11 was the latest/greatest. Which step response matches the system transfer function. hive> ANALYZE TABLE ops_bc_log PARTITION(day) COMPUTE STATISTICS noscan; output is Partition logdata.ops_bc_log{day=20140523} stats: [numFiles=37, numRows=26095186, totalSize=654249957, rawDataSize=58080809507] By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. As discussed in the previous recipe, Hive provides the analyze command to compute table or partition statistics. How can I extract the contents of a Windows 3.1 (16-bit) game EXE file? The PARTITION clause is only allowed in combination with the INCREMENTAL clause.It is optional for COMPUTE INCREMENTAL STATS, and required for DROP INCREMENTAL STATS.Whenever you specify partitions through the PARTITION (partition_spec) clause in a COMPUTE INCREMENTAL STATS or DROP INCREMENTAL STATSstatement, you must include all the partitioning columns in the … I am trying to compute stats for my table in hive which is partitioned. set hive.cbo.enable=true; set hive.compute.query.using.stats=true; set hive.stats.fetch.column.stats=true; set hive.stats.fetch.partition.stats=true; Once you set the above variable, you use ‘analyze‘ command on table to collect statistics. Thanks. table_name: A table name, optionally qualified with a database name. I am running the following code hive --hiveconf hive.root.logger=DRFA --hiveconf hive.log.dir=./logs --hiveconf hive.log.level= Number of files 3. Were all the Redwall songs created by Brian Jacques, or based on some real songs? Computing stats for tables with a 100,000 or more partitions might fail or be very slow due to the high cost of updating the partition metadata in the Hive Metastore. For a partitioned table, Hive's ANALYZE TABLE command will compute the column stats on a per-partition basis. For example: create table colstatspartint (key int, value string) partitioned by (part int); insert into colstatspartint partition (part='0003') select key, value from src limit 30; analyze table colstatspartint partition (part='0003') compute statistics for columns; or analyze table colstatspartint partition (part=0003) compute statistics for columns; you will get the error: Analyzing a table (also known as computing statistics) is a built-in Hive operation that you can execute to collect metadata on your table. There are two ways Hive table statistics are computed. HiveQL’s analyze command will be extended to trigger statistics computation on one or more column in a Hive table/partition. I am trying to compute stats for my table in hive which is partitioned. To allow dynamic partitioning you use SET hive.exec.dynamic.partition=true;. The HiveQL in order to compute column statistics is as follows: Partition is helpful when the table has one or more Partition keys. Partitioning: Hive partitioning will create different directories for each partition. Making statements based on opinion; back them up with references or personal experience. The same command could be used to compute statistics for one or more column of a Hive table or partition. Is it possible to create a "digital seal" to tell if a document has been opened? To learn more, see our tips on writing great answers. These tables can be created through either Impala or Hive. Do Master Records (in a Master-detail Relationship) Get Locked? These statistics will be used by optimizer to create optimal execution plan. What is our time-size in spacetime? Effects of time dilation on our observations of the Sun, Ancient temple booby traps designed for dragons. Why would a Cloaking Device be a technology the Federation could not have developed on its own? It's not clear that this approach even makes sense because how will one then aggregate the different distinct-value stats across partitions?
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