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pg_stat_statements + pg_stat_activity + loq_query = pg_ash?

Si një shtesë e shkurtër për artikullin Përpjekja për të krijuar një analog të ASH për PostgreSQL.

Detyra

ËshtĂ« e nevojshme tĂ« lidhen historitĂ« e paraqitjeve pg_stat_statements, pg_stat_activity. Si rezultat, duke pĂ«rdorur historinĂ« e planeve tĂ« ekzekutimit nga tabela shĂ«rbimi log_query, mund tĂ« marrim shumĂ« informacion tĂ« dobishĂ«m pĂ«r t'u pĂ«rdorur nĂ« procesin e zgjidhjes sĂ« incidenteve tĂ« performancĂ«s dhe optimizimit tĂ« pyetjeve.

Kujdes.

Për shkak të vazhdimit të provës dhe zhvillimit, artikulli nuk mund të pretendojë përshkrimin e një zgjidhjeje industriale të gatshme.

Kritikat dhe sugjerimet për realizimin janë gjithmonë të mirëpritura dhe priten.

Të dhënat hyrëse

Tabela history_pg_stat_activity

--ACTIVITY_HIST.HISTORY_PG_STAT_ACTIVITY
DROP TABLE IF EXISTS activity_hist.history_pg_stat_activity;
CREATE TABLE activity_hist.history_pg_stat_activity
(
  timepoint timestamp without time zone ,
  datid             oid  , 
  datname           name ,
  pid               integer,
  usesysid          oid    ,
  usename           name   ,
  application_name  text   ,
  client_addr       inet   ,
  client_hostname   text   ,
  client_port       integer,
  backend_start     timestamp without time zone ,
  xact_start        timestamp without time zone ,
  query_start       timestamp without time zone ,
  state_change      timestamp without time zone ,
  wait_event_type   text ,                     
  wait_event        text ,                   
  state             text ,                  
  backend_xid       xid  ,                 
  backend_xmin      xid  ,                
  query             text ,               
  backend_type      text ,
  queryid           bigint
);

Tabeli pg_stat_db_queries

CREATE TABLE pg_stat_db_queries
(
  database_id integer ,
  queryid bigint ,
  query text ,
  max_time double precision
);

Pamja e materializuar mvw_pg_stat_queries

CREATE MATERIALIZED VIEW public.mvw_pg_stat_queries AS
 SELECT t.queryid,
    t.max_time,
    t.query
   FROM public.dblink('LINK1'::text, 'SELECT queryid , max_time , query FROM pg_stat_statements WHERE dbid=(SELECT oid FROM  pg_database WHERE datname=current_database() ) AND max_time >= 0 '::text) t(queryid bigint, max_time double precision, query text)
  WITH NO DATA;

Tabeli log_query

CREATE TABLE log_query
(
  id  integer ,
  queryid  bigint ,
  query_md5hash  text ,
  database_id  integer ,
  timepoint  timestamp without time zone , 
  query  text ,
  explained_plan  text[] , 
  plan_md5hash  text ,
  explained_plan_wo_costs  text[] ,
  plan_hash_value  text ,
  ip  text,
  port  text , 
  pid  integer 
);

Algoritmi i përgjithshëm

Rifresko tabelën pg_stat_db_queries

Rifresko materializimin mvw_pg_stat_queries

KRIJO O RISPERO FUNKSIONIN refresh_pg_stat_queries_list( database_id int) KTHE BOOLEAN AS $$
DEKLARA
 rezultati BOOLEAN ;
 regjistri_db rekord ;  
FILLIMI   
  SELECT *
  NË
  DALIMIN e endpoint e JOIN database d ON e.id = d.endpoint_id 
  KU d.id = database_id  ;  
  
  NË QOFSE NUK Ă«shtĂ« monitoring_nĂ«_nevojĂ« database_rec THEN RAISE NOTICE 'NUK KEMI NEVOJË PËR MONITORIM PËR database_id=%',database_id; kthe TRUE ; MERR FUND ;
  
  EXECUTO 'SELECT dblink_connect(''LINK1'',''host='||database_rec.host||' port=5432 dbname='||database_rec.name||
		                                         ' user='||database_rec.s_name||' password='||database_rec.s_pass|| ' '')';
   
  RIFRESKO MATERIALIZIMIN mvw_pg_stat_queries ;
  
  KRYE dblink_disconnect('LINK1');  

  KTHE rezultatin;
FUND
$$ GJUHA plpgsql;

Mbush tabelën pg_stat_db_queries

KRIJO O RISPERO FUNKSIONIN refresh_pg_stat_db_queries( ) KTHE BOOLEAN AS $$
DEKLARA
 rezultati BOOLEAN ;
 regjistri_db rekord ;  
 regjistri_pg_stat rekord ;
FILLIMI 
  TRUNCATE pg_stat_db_queries;
  
  
  PËR regjistri_db nĂ«
  SELECT *
  NGA database d 
  LOOP
  
    NË QOFSE NUK Ă«shtĂ« monitoring_nĂ«_nevojĂ« database_rec THEN RAISE NOTICE 'NUK KEMI NEVOJË PËR MONITORIM PËR database_id=%',database_rec.id; CONTINUE ; MERR FUND ;
   
    KRYE refresh_pg_stat_queries_list( regjistri_db.rec.id ) ; 
	
	PËR regjistri_pg_stat nĂ«
	SELECT * 
	FROM mvw_pg_stat_queries 
	LOOP
	  SHTO në pg_stat_db_queries
	  ( database_id , queryid , query , max_time )
	  VLERAT
	  ( regjistri_db.rec.id , regjistri_pg_stat.queryid , regjistri_pg_stat.query , regjistri_pg_stat.max_time);
	MERR FUND;     
  MERR FUND; 

  KTHE TRUE;
FUND
$$ GJUHA plpgsql;

Si përfundim, tabela përmban tekste të normalizuara të kërkesave, queryid, kohën maksimale të ekzekutimit të kërkesës deri në këtë moment (përdoret për monitorim).

Plotësimi i log_query dhe krijimi i historisë së planeve të ekzekutimit.

Teksti aktual i kërkesës merret nga log-fajli. Log-fajli nga hosti burimor në hostin e monitorimit bëhet pjesë-pjesë, me një skript bash, përmes cron. Për të kursyer hapësirë dhe për shkak të trivialitetit të detyrës së kopjimit të një cope të fajlit tekstual nga një host në tjetrin, skripti nuk përmendet.

Parsing i log-fajlit dhe veçimi i tekstit të kërkesës.

#!/bin/bash
#########################################################
# upload_log_query.sh
# Upload table table from dowloaded aws file 
# version 12.0
###########################################################  
echo 'TIMESTAMP:'$(date +%c)' Upload log_query table '

source_file=$1
echo 'source_file='$source_file

database_id=$2
echo 'database_id='$database_id

database_name=$3
echo 'database_name='$database_name


beginer=' '
first_line='1'
let "line_count=0"
sql_line=' '
sql_flag=' '    
space=' '
cat $source_file | while read line
do
  #first line will be passed
  if [[ $line_count == '0' ]]; then 
    let "line_count++" 
    continue 
  fi
  
  line="$space$line"
  #echo 'line='$line

  if [[ $first_line == "1" ]]; then
    beginer=`echo $line | awk -F" " '{ print $1}' `
    first_line='0'
  fi

  current_beginer=`echo $line | awk -F" " '{ print $1}' `
  #echo 'current_beginer='$current_beginer
  #echo 'beginer='$beginer
  

  if [[ $current_beginer == $beginer ]]; then
   if [[ $sql_flag == '1' ]]; then
     sql_flag='0' 
     #echo 'TIMESTAMP:'$(date +%c)' Upload log_query table : SQL STATEMENT ='"$sql_line"

     log_date=`echo $sql_line | awk -F" " '{ print $1}' `
     #echo 'log_date='$log_date

     log_time=`echo $sql_line | awk -F" " '{ print $2}' `
     #echo 'log_time='$log_time
     
     duration=`echo $sql_line | awk -F" " '{ print $5}' `
     #echo 'duration='$duration

	 connect=`echo $sql_line | awk -F" " '{ print $3}' `
	 userdb=`echo $connect | awk -F":" '{ print $3}' `
	 userdb2=$userdb'@'
	 db_port_log=`echo $connect | awk -F"@" '{ print $2}' `
	 log_database_name=`echo $db_port_log | awk -F":" '{ print $1}' `
	 
	 
	 #echo 'connect='$connect
	 #echo 'userdb='$userdb
	 #echo 'userdb2='$userdb2
	 #echo 'db_port_log='$db_port_log
	 #echo 'log_database_name='$log_database_name
	 
	 if [[  "$log_database_name" != "$database_name" ]];
	 then
	   echo '*** database_name '$log_database_name' from log is not equal '$database_name' CONTINUE '
	   continue;
	 fi
	 
     #replace ' to ''
     sql_modline=`echo "$sql_line" | sed 's/'''/''''''/g'`
     sql_line=' '
	 #echo '*********************************log_query start'
     #echo 'pid_str='$pid_str 
	 #echo 'ip_port='$ip_port 
	 #echo 'database_id='$database_id 
	 #echo 'log_date='$log_date
	 #echo 'log_time='$log_time
	 #echo 'duration='$duration
	 #echo 'sql_modline='$sql_modline
     if ! psql -U monitor -d monitor -v ON_ERROR_STOP=1 -A -t -q -c "select log_query( '$pid_str' , '$ip_port' , $database_id , '$log_date' , '$log_time' , '$duration' , '$sql_modline' )"
     then
        echo 'FATAL_ERROR - log_query '
        exit 1
     fi
	 #echo '**********************************log_query finish'

    fi #if [[ $sql_flag == '1' ]]; then

    let "line_count=line_count+1"
    #echo 'line_count= '$line_count
    #echo $line

    #check=`echo $line | awk -F" " '{ print $8}' `
    #check_sql=${check^^}    

    #echo 'check_sql='$check_sql
    
	if [[ ${line^^} =~ "SELECT" ]]; 
	then 
	 if [[ $line =~ "duration:" ]];
	 then
	    test_statement=`echo $line | awk -F" " '{ print $8}'` 
		is_select=${test_statement^^}		
		
		#echo 'test_statement='$test_statement
		#echo 'is_select='$is_select
		
        if [[ $is_select == 'SELECT' ]]; 
        then		
		  sql_flag='1'    
		  sql_line="$sql_line$line"
		  ip_port=`echo $sql_line | awk -F":" '{ print $4}' `
		  pid_str=`echo $sql_line | awk -F":" '{ print $6}' `
		fi
	 fi	 
    fi
  else       
    #echo $line
    #echo 'sql_flag ='$sql_flag

    if [[ $sql_flag == '1' ]]; then
      sql_line="$sql_line$line"
    fi   
    
  fi #if [[ $current_beginer == $beginer ]]; then

done

Plotësimi i tabelës log_query.

--log_query.sql
--insert new query into log_query table
CREATE OR REPLACE FUNCTION log_query( pid_str text , ip_port text ,log_database_id integer , log_date text , log_time text , duration text , sql_line text   ) RETURNS boolean AS $$
DECLARE
  result boolean ;
  log_timepoint timestamp without time zone ;
  log_duration double precision ; 
  pos integer ;
  log_query text ;
  activity_string text ;
  log_md5hash text ;
  log_explain_plan text[] ;
  
  log_planhash text ;
  log_plan_wo_costs text[] ; 
  
  database_rec record ;
  
  pg_stat_query text ; 
  test_log_query text ;
  metric_rec record;
  log_query_rec record;
  found_flag boolean;
  
  pg_stat_history_rec record ;
  port_start integer ;
  port_end integer ;
  client_ip text ;
  client_port text ;
  log_queryid bigint ;
  log_query_text text ;
  pg_stat_query_text text ; 
  current_pid_str text ;
  current_pid integer;
  pid_start_pos integer ;
  pid_finish_pos integer ;
  
BEGIN
  result = TRUE ;    
  
  IF ip_port != '[local]' THEN
    port_start = position('(' in ip_port);
    port_end = position(')' in ip_port);
    client_ip = substring( ip_port from 1 for port_start-1 );
    client_port = substring( ip_port from port_start+1 for port_end-port_start-1 );
  ELSE 
    client_ip = 'local';
	client_port = 'local';
  END IF; 
  
  pid_start_pos = position('[' in pid_str);
  pid_finish_pos = position(']' in pid_str);
  current_pid_str=substring( pid_str from 2 for pid_finish_pos - pid_start_pos -1 );
  current_pid = to_number(current_pid_str , '999999999999');
  
  SELECT e.host , d.name , d.owner_pwd , d.owner_user
  INTO database_rec
  FROM database d JOIN endpoint e ON e.id = d.endpoint_id
  WHERE d.id = log_database_id ;
  
  log_timepoint = to_timestamp(log_date||' '||log_time,'YYYY-MM-DD HH24-MI-SS');
  log_duration = duration::double precision ; 
    
  pos = position ('SELECT' in UPPER(sql_line) );
  log_query = substring( sql_line from pos for LENGTH(sql_line));
  log_query = regexp_replace(log_query,' +',' ','g');
  log_query = regexp_replace(log_query,';+','','g');
  log_query = trim(trailing ' ' from log_query);
  
  log_md5hash = md5( log_query::text );
  
  --Explain execution plan--
EXECUTE 'SELECT dblink_connect(''LINK1'',''host='||database_rec.host||' port=5432 dbname='||database_rec.name||' user='||database_rec.owner_user||' password='||database_rec.owner_pwd||' '')'; 
  
  log_explain_plan = ARRAY ( SELECT * FROM dblink('LINK1', 'EXPLAIN '||log_query ) AS t (plan text) );
  log_plan_wo_costs = ARRAY ( SELECT * FROM dblink('LINK1', 'EXPLAIN ( COSTS FALSE ) '||log_query ) AS t (plan text) );
  
  PERFORM dblink_disconnect('LINK1');
  --------------------------
  BEGIN
	INSERT INTO log_query
	(
		query_md5hash ,
		database_id , 
		timepoint ,
		duration ,
		query ,
		explained_plan ,
		plan_md5hash , 
		explained_plan_wo_costs , 
		plan_hash_value , 
		ip , 
		port ,
		pid
	) 
	VALUES 
	(
		log_md5hash ,
		log_database_id , 
		log_timepoint , 
		log_duration , 
		log_query ,
		log_explain_plan , 
		md5(log_explain_plan::text) ,
		log_plan_wo_costs , 
		md5(log_plan_wo_costs::text),
		client_ip , 
		client_port , 
		current_pid
		
	);
	activity_string = 	'New query has logged '||
						' database_id = '|| log_database_id ||
						' query_md5hash='||log_md5hash||
						' , timepoint = '||to_char(log_timepoint,'YYYYMMDD HH24:MI:SS');
	PERFORM pg_log( log_database_id , 'log_query' , activity_string);  

	EXCEPTION
	  WHEN unique_violation THEN
		activity_string = 	'EXCEPTION *** query already has logged '||
							' database_id = '|| log_database_id ||
							' query_md5hash='||log_md5hash||
							' , timepoint = '||to_char(log_timepoint,'YYYYMMDD HH24:MI:SS');					 
        PERFORM pg_log( log_database_id , 'log_query' , activity_string);
	END;

	SELECT 	queryid
	INTO   	log_queryid
	FROM 	log_query 
	WHERE 	query_md5hash = log_md5hash AND
			timepoint = log_timepoint;

	IF log_queryid IS NOT NULL 
	THEN 
	  RETURN result;
	END IF;
	
	------------------------------------------------
	SELECT * 
	INTO log_query_rec
	FROM log_query
	WHERE query_md5hash = log_md5hash AND timepoint = log_timepoint ; 
	
	log_query_rec.query=regexp_replace(log_query_rec.query,';+','','g');

	FOR pg_stat_history_rec IN
	 SELECT 
            queryid ,
  	    query 
	 FROM 
       pg_stat_db_queries 
     WHERE  
	   database_id = log_database_id AND
       queryid is not null 
	LOOP
	  pg_stat_query = pg_stat_history_rec.query ; 
	  pg_stat_query=regexp_replace(pg_stat_query,'n+',' ','g');
	  pg_stat_query=regexp_replace(pg_stat_query,'t+',' ','g');
	  pg_stat_query=regexp_replace(pg_stat_query,' +',' ','g');
	  pg_stat_query=regexp_replace(pg_stat_query,'$.','%','g');
	
	  log_query_text = trim(trailing ' ' from log_query_rec.query);
	  pg_stat_query_text = pg_stat_query;   
	  
	  IF (log_query_text LIKE pg_stat_query_text) THEN
		found_flag = TRUE ;
	  ELSE
		found_flag = FALSE ;
	  END IF;	  

	  IF found_flag THEN
	    
		UPDATE log_query SET queryid = pg_stat_history_rec.queryid WHERE query_md5hash = log_md5hash AND timepoint = log_timepoint ;
		activity_string = 	' updated queryid = '||pg_stat_history_rec.queryid||
		                    ' for log_query with id = '||log_query_rec.id;					
		EXIT ;
	  END IF ;	  
	END LOOP ;	
  RETURN result ;
END
$$ LANGUAGE plpgsql;

Si pasqyra përmban tekstin aktual të pyetjes, planet e ekzekutimit, vlerën hash të planit të ekzekutimit, vlerën hash të tekstin të pyetjes.

Plotësoni vlerën queryid në tabelën history_pg_stat_activity

update_history_pg_stat_activity_by_queryid.sql

--update_history_pg_stat_activity_by_queryid.sql
CREATE OR REPLACE FUNCTION update_history_pg_stat_activity_by_queryid() RETURNS boolean AS $$
DECLARE
  result boolean;
  history_pg_stat_activity_rec record;
  pg_stat_query text;
  pg_stat_query_text text;
  pg_stat_history_rec record;
  found_flag boolean;
  history_pg_stat_activity_query text;
  query_text text;
  activity_string text;
  
BEGIN
  RAISE NOTICE '***update_history_pg_stat_activity_by_queryid';
  
  result = TRUE;
  
  FOR history_pg_stat_activity_rec IN 
  SELECT DISTINCT(query) AS query
  FROM activity_hist.history_pg_stat_activity
  WHERE queryid IS NULL
  LOOP
		history_pg_stat_activity_query = regexp_replace(history_pg_stat_activity_rec.query,'n+',' ','g');
		history_pg_stat_activity_query = regexp_replace(history_pg_stat_activity_query,'t+',' ','g');
		history_pg_stat_activity_query = regexp_replace(history_pg_stat_activity_query,' +',' ','g');
		history_pg_stat_activity_query = regexp_replace(history_pg_stat_activity_query,';','','g');
		query_text = trim(trailing ' ' from history_pg_stat_activity_query);
		
		FOR pg_stat_history_rec IN
		SELECT 
			queryid,
			query 
		FROM 
			--pg_stat_history
			pg_stat_db_queries
		WHERE  
			queryid is not null 
		GROUP BY queryid, query 
		LOOP
			pg_stat_query = pg_stat_history_rec.query;
			pg_stat_query=regexp_replace(pg_stat_query,'n+',' ','g');
			pg_stat_query=regexp_replace(pg_stat_query,'t+',' ','g');
			pg_stat_query=regexp_replace(pg_stat_query,' +',' ','g');
			pg_stat_query=regexp_replace(pg_stat_query,'$.','%','g');	
			
			pg_stat_query_text = pg_stat_query;
	  
			IF (query_text LIKE pg_stat_query_text) THEN
				found_flag = TRUE;
			ELSE
				found_flag = FALSE;
			END IF;	  
			
			IF found_flag 
			THEN
				UPDATE activity_hist.history_pg_stat_activity
				SET queryid = pg_stat_history_rec.queryid
				WHERE regexp_replace(regexp_replace(regexp_replace(regexp_replace(query,'n+',' ','g'),'t+',' ','g'),' +',' ','g'),';','','g') 
				      LIKE query_text||'%';
		
				activity_string = 	'history_pg_stat_activity ka është përditësuar me queryid = '||pg_stat_history_rec.queryid;
				RAISE NOTICE '%',activity_string;	
				
				PERFORM pg_log(999, 'update_history_pg_stat_activity_by_queryid', activity_string);
				
				EXIT;
				
			END IF;	  
		END LOOP;
		
		IF NOT found_flag 
		THEN
			activity_string = 'KËSHILLË: Queryid nuk u gjet pĂ«r query: '||query_text;
			
			RAISE NOTICE '%',activity_string;	
				
			PERFORM pg_log(999, 'update_history_pg_stat_activity_by_queryid', activity_string);
		END IF;
		
	RAISE NOTICE 'PËRPUNIMIT tĂ« log_query nĂ«se query nuk Ă«shtĂ« regjistruar nĂ« skedarin e log-ut';
		
  END LOOP;
  
  RETURN result;
END
$$ LANGUAGE plpgsql;

Si rezultati, tabela përmban vlerën e queryid që korrespondon me vlerën e queryid të kërkesës.

PĂ«rfundimi

Duke lidhur pg_stat_activity, pg_stat_statements, log_query, mund të merrni shumë informacion të dobishëm në lidhje me kërkesën, përfshirë:

  • Historia e planeve tĂ« ekzekutimit.
  • Historia e kohĂ«s CPU tĂ« kĂ«rkesĂ«s.
  • Historia e pritjeve tĂ« kĂ«rkesĂ«s.

Të dhënat dhe shumë raporte të tjera do të përshkruhen në artikullin e ardhshëm.

Zhvillimi

Duke lidhur informacionin ekzistues me historinë e shfaqjes së pg_locks, mund të merrni informacion në lidhje me cilën bllokim konkret priste kërkesa dhe, më e rëndësishmja, cili proces (kërkesë) mbante këtë bllokim.

Zgjidhja e kësaj çështjeje do të përshkruhet në artikullin e ardhshëm. Tani po zhvillohet testimi dhe përmirësimi.

Burimi: habr.com

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