Vertica MC chart understanding

Hi, I am using vertica management console and I would like to know the meaning of the categories in the "User Query Type Distribution" chart. I can see a legend with these categories: DDL, QUERY, SET,TRUNCATE and UTILITY. Can someone tell me which operations typically match each category ? (For example database designer, loading data, deleting data, modifying data, reorganize projections...) While in the "Query Concurrency" chart, I'd like to know why I find a peak every 5 minutes for system queries even if I am not working on the database. Thanks, Pietro.


  • Hi! 1. * DDL - data definition language, aka queries from type CREATE/DROP/ALTER * QUERY - data manipulation language(DML): SELECT/INSERT/PROFILE/UPDATE/DELETE requests on user tables * SET - parameters modification(queries that starts from "SET", for example: "set session autocommit to off") * TRUNCATE - its really very hard :) queries from type TRUNCATE TABLE * UTILITY - inner db activity: TupleMover , DBD, move partitions and so on + EXPLAIN 2. May be inner db activity like AnalyzeRowCount, TupleMover ?
  • thank you Daniel!! what about "Query Concurrency" chart ? Can you explain those peaks? thanks again, Pietro
  • Pietro - 

    The peaks every 5m or so will typically represent the various internal services of vertica.  This includes things like tuple mover and/or mergeout processes.  They will kickoff to see if there is any work to do - which is what you are most likely seeing.

    You can click on the data point which will drilldown into actual queries themselves that  make up that time period and view system/user queries which would confirm my statement.


Leave a Comment

BoldItalicStrikethroughOrdered listUnordered list
Align leftAlign centerAlign rightToggle HTML viewToggle full pageToggle lights
Drop image/file