![]() You can scroll through the query list and look at the execution plan for each query by clicking on the “Execution Plan” tab. Clicking on this tab will execute a query to gather explain information already stored in the database and display a plan with an explain diagram for the selected query. ![]() There is also an “Execution Plan” tab on the bottom pane. Notice the type drop down at the top of the list panel which shows type equal “Query” initially. This list is based on your filter selection. #AZURE DATA STUDIO REDSHIFT UPDATE#If you change the schema or data for a table and run the analyze command again to update the statistical metadata, the query plan might be different.ĭisplays a list of queries. It only shows the plan that Redshift will execute if the query is run under current operating conditions. The plan describes the access path that will get used when the query is executed. In this case, no data is returned because the query is never executed. The information returned for this query execution will be a text version of the explain plan and not the visual explain plan grid with diagram. The execution plan contains the actual cost for running the query. Turning ON this button during normal query execution will return the query data result set as well as the visual explain execution plan with a diagram. It does give you an indication of which operations in a query are consuming the most resources.Įxecuting Visual Explain in Aqua Data Studio Cost does not provide any precise information about actual execution times or memory consumption, nor does it provide a meaningful comparison between execution plans. *Cost is a measure that compares the relative execution times of the steps within a plan. QueryNo - The number assigned to this query. When the compute nodes are done, they return the query results to the leader node for final processing. The compute node slices and executes the query segments in parallel. The leader node receives the query and parses the SQL. Step Location - Location where the step executes, compute node or leader node. A list of step labels and their associated function can be found here: Step Labels - Consists of the query step name(s) and, when applicable, table ID and table name. Rows Pre-filtered - For scans of permanent tables, the total number of rows emitted before filtering rows marked for deletion (ghost rows). Work Memory - Amount of working memory (in bytes) assigned to the query step(s). % of Total Avg Time - Percentage of the total average amount of time for all steps. % of Total Max Time - Percentage of the total maximum amount of time for all steps. Maximum Time(uS) - Maximum amount of time for the step(s) to execute (in microseconds).Īverage Time(uS) - Average time for the step(s) to execute (in microseconds). Rows Produced - The estimated number of rows that will be produced by the step.īytes Produced - The estimated number of bytes that will be produced by the step. ![]() *Startup Cost - The estimated relative cost of returning the first row for this step. *Total Cost - The estimated relative cost of executing the step. Additional information can be found here: Īdditional Operation Info - Qualifier and filter information for the operation. It also references inner and outer tables. This data movement can be either a broadcast or a redistribution. For joins it also specifies a method for how data will be moved around a cluster to facilitate the join. Alert messages from the database will also be displayed in this column. Operation - Plan nodes that refer to the execution on compute nodes. Here is a list of the information that is returned: Costing, duration and memory usage are some of the information returned in the summarized steps. Aqua Data Studio queries these tables and summarizes the steps used in the access path. ![]()
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