Trx/stm | operator_name | path_id | execution time(sec) | clock time (sec) | estimated rows produced | rows produced | RowsDiff | memory reserved (MB) | memory allocated Group by transaction_id||' / '||statement_id,operator_name,path_id ) a Reserved (bytes)','memory allocated (bytes)') WHERE (counter_name='execution time (us)' or counter_name = 'clock time (us)')Īnd counter_name in ('execution time (us)','clock time (us)','estimated rows produced','rows produced','memory Row_number () over (order by counter_valuedesc ) as rnum ,ĭecode(is_executing,true,'X',null) as run,ĭecode(is_executing,true,eep.session_id||'/'||eep.transaction_id||'/'||eep.statement_id,null) as 'sid/įROM v_monitor.execution_engine_profileseep left outer join v_ssionsses on ( ses.session_id (Remember when profiling is not enabled this will show only active queries) This query will show the top 10 most time consuming operators on your system. It’s mostly useful for a single statement to see which phase in the plan took the longest time andĪt system level we can see which operator takes most of the system resources. It has about 30 distinct operator for each sql (if all were active) execution_engine_profiles tables is a very detailed table.Will replace it.( this is for another article).

It will save all queries + internal Vertica queries to a persistent table and not in the systemĪccording to Vertica support this would be deprecated in the future and data collector tables

If we want to save the history of queries we can turn on the query repository.

This can be used to monitor long running queries in real time.

Even when tracing is not enabled, Active Queries will still show up in query_profiles and.

Global – will clear all sessions data from all nodes from tables. Local – will clear data from tables only for the current session. To clean those trace tables use the clear_profiling command.Įxample -select clear_profiling(‘GlobalEEProfiling’, 'local') We will get a lot of rows in execution_engine_profiles table.

When we trace at a session or a system level.

The output will populate the tables based on the level of tracing ( session,query and ee).Įxample - SELECT SET_CONFIG_PARAMETER(‘GlobalEEProfiling’, 1) System – when using the SET_CONFIG_PARAMETER command it will trace all queries from all sessions The output will populate the tables based on the level of tracing ( session, query and ee).Įxample - SELECT ENABLE_PROFILING(‘ee’) Session – when using ENABLE_PROFILING command will trace all the session statements. Then we will be able to analyze the results by queryingĮxample – profile select ‘testing’ from dual Select - when we put “profile” before our select, it will trace only the select statement. ee – populates both Query_profile and execution_engine_profiles.

Query – populates ONLY Query_profile table.ģ. Session - populates ONLY session_profiles table.Ģ. Session & system have three levels of tracingġ. execution_engine_profiles- detailed info per operator like the clock time of a join operator. Query_profile – info about queries such as query start, projection used and sql text.ģ. session_profiles – aggregate counter for the session and locks stats.Ģ. The trace output populates some of the 3 tables, depends on the level of tracing.

There are 3 levels of tracing in Vertica, However, I've studied the trace mechanism of Vertica and I'd like to What was going on in the system and what causes the queries to be slower than usual? Well … not forĪll the questions I have answers. That's why when I approached Vertica I first asked how could I see Oracle has some great utilities that I use for trackingĭown problems and solving them. I come from Oracle Performance/Tuning World.

Ilike vertica