PERCENTILE_CONT(0.95) WITHIN GROUP (ORDER BY duration) OVER (PARTITION BY db, "user", query_group, day) AS p95, PERCENTILE_CONT(0.90) WITHIN GROUP (ORDER BY duration) OVER (PARTITION BY db, "user", query_group, day) AS p90, PERCENTILE_CONT(0.75) WITHIN GROUP (ORDER BY duration) OVER (PARTITION BY db, "user", query_group, day) AS p75, PERCENTILE_CONT(0.50) WITHIN GROUP (ORDER BY duration) OVER (PARTITION BY db, "user", query_group, day) AS median, (total_queue_time + total_exec_time)/1000000.0 AS durationįROM stl_query q, stl_wlm_query w, pg_user u Query duration stats per database, user and query group including the max, median, 99 percentile, etc. Show the most recently executed DDL statements SELECT Stl_query q JOIN query_sql qs ON (q.query = qs.query) (CASE aborted WHEN 1 THEN TRUE ELSE FALSE END) AS aborted, LISTAGG(text) WITHIN GROUP (ORDER BY sequence) AS sqlĭATEDIFF(milliseconds, starttime, endtime)/1000.0 AS duration,
#Redshift create table as select full#
Get the full SQL, plus more query details from a query ID WITH query_sql AS ( List all databases SELECT * FROM pg_database List users and groups SELECT * FROM pg_user Svv_diskusage.tbl = pg_attribute.attrelid TRIM(pg_attribute.attname) AS column_name, The size in MB of each column of each table (actually the number of blocks, but blocks are 1 MB) SELECT Vacuum progress SELECT * FROM svv_vacuum_progress įind tables that need vacuum or analyze SELECT "database", "schema", "table", unsorted, stats_off Table column metadata SELECT * FROM pg_table_def JOIN pg_database ON pg_database.oid = db_id Table sizes in GB SELECT t.name, COUNT(tbl) / 1000.0 AS gb
Table information like sortkeys, unsorted percentage SELECT * FROM svv_table_info Trunc (date_add('ms', myEpocTimeStamp,'')) as session_date, # Redshift Date Manipuation #assuming epoch time 13 digitsĭate_add('ms', myEpocTimeStamp,'')AS session_datetime,
#Redshift create table as select how to#
How to view the dist-key and sort key in table in AWS Redshift? select * from SVV_TABLE_INFO More create examples that will impact your performance…īefore: simple example with sortkey and distkey create table activity (Īfter: simple example with sortkey and distkey create table activity ( Interleaved sortkey (c_custkey, c_city, c_mktsegment) You can define a maximum of 400 SORTKEY columns per table.Ĭreate example with compound sortkey create table sales(Ĭreate example with interleaved sortkey create table customer_interleaved ( If you don’t specify any sort keys, the table isn’t sorted. Only compound sort keys are created with this syntax. You can use the SORTKEY keyword after a column name to specify a single-column sort key, or you can specify one or more columns as sort key columns for the table by using the SORTKEY ( column_name ) syntax. When data is loaded into the table, the data is sorted by one or more columns that are designated as sort keys. Keyword that specifies that the column is the sort key for the table.
Qtysold smallint not null encode mostly8,įoreign key(listid) references listing(listid),įoreign key(sellerid) references users(userid),įoreign key(buyerid) references users(userid),įoreign key(dateid) references date(dateid)) Notice this can cause skews in your cluster storage.Ĭreate example with distkey create table sales(Įventid integer not null encode mostly16, For more information, see the DISTSTYLE parameter later in this topic. You can use the DISTKEY keyword after a column name or as part of the table definition by using the DISTKEY ( column_name) syntax. Only one column in a table can be the distribution key. Keyword that specifies that the column is the distribution key for the table. The distribution style that you select for tables affects the overall performance of your database. Amazon Redshift distributes the rows of a table to the compute nodes according to the distribution style specified for the table. Keyword that defines the data distribution style for the whole table. Use distsytle or distkey with sortkey – create table demystified Redshift Distribution Key – Choosing Best Distribution Style Redshit create table with emphasis on performance Insert into table from S3 COPY test_ers FROM 's3://ariel-s3-buket/tickitdb/allusers_pipe.txt' iam_role 'arn:aws:iam::527228915290:role/RedshiftAccessS3' delimiter '|' region 'us-east-1' Ĭasting select cast(pricepaid as integer) Get list of databases select oid as database_id,Ĭonnect to db SELECT * FROM PG_TABLE_DEF WHERE schemaname ='public'Ĭheat sheet for basic SQL operations on Redshift.Ĭreate table create table test_ers(ĬTAS create table event_backup as select * from event ĬTAS with distkey and sory key create table myTable2
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