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pg_stat_statements + pg_stat_activity + loq_query = pg_ash?

Bi awọn kan kukuru afikun si awọn article Igbiyanju lati ṣẹda afọwọṣe ASH fun PostgreSQL.

Nkan

O jẹ dandan lati sopọ mọ itan wiwo pg_stat_statemenets, pg_stat_activity. Bi abajade, ni lilo itan-akọọlẹ ti awọn ero ipaniyan lati tabili iṣẹ log_query, o le gba alaye pupọ ti o wulo fun lilo ninu ilana ti ipinnu awọn iṣẹlẹ iṣẹ ṣiṣe ati imudara awọn ibeere.

Ikilo

Nitori ilọsiwaju ti idanwo ati idagbasoke, nkan naa ko le beere lati ṣapejuwe ojutu ile-iṣẹ ti a ti ṣetan.

Lodi ati awọn asọye lori imuse jẹ itẹwọgba ni agbara ati nireti.

Data igbewọle

Itan tabili_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
);

Tabili pg_stat_db_queries

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

Wiwo ohun elo 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;

log_query tabili

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 
);

Alugoridimu gbogbogbo

Tabili imudojuiwọn pg_stat_db_queries

Ṣe imudojuiwọn wiwo ohun elo mvw_pg_stat_queries

CREATE OR REPLACE FUNCTION refresh_pg_stat_queries_list( database_id int) RETURNS BOOLEAN AS $$
DECLARE
 result BOOLEAN ;
 database_rec record ;  
BEGIN   
  SELECT *
  INTO database_rec
  FROM endpoint e JOIN database d ON e.id = d.endpoint_id 
  WHERE d.id = database_id  ;  
  
  IF NOT database_rec.is_need_monitoring THEN RAISE NOTICE 'NO NEED MONITORING FOR database_id=%',database_id; return TRUE ; END IF ;
  
  EXECUTE 'SELECT dblink_connect(''LINK1'',''host='||database_rec.host||' port=5432 dbname='||database_rec.name||
		                                         ' user='||database_rec.s_name||' password='||database_rec.s_pass|| ' '')';
   
  REFRESH MATERIALIZED VIEW mvw_pg_stat_queries ;
  
  PERFORM dblink_disconnect('LINK1');  

  RETURN result;
END
$$ LANGUAGE plpgsql;

Gbagbe tabili pg_stat_db_queries

CREATE OR REPLACE FUNCTION refresh_pg_stat_db_queries( ) RETURNS BOOLEAN AS $$
DECLARE
 result BOOLEAN ;
 database_rec record ;  
 pg_stat_rec record ;
BEGIN 
  TRUNCATE pg_stat_db_queries;
  
  
  FOR database_rec IN
  SELECT *
  FROM database d 
  LOOP
  
    IF NOT database_rec.is_need_monitoring THEN RAISE NOTICE 'NO NEED MONITORING FOR database_id=%',database_rec.id; CONTINUE ; END IF ;
   
    PERFORM refresh_pg_stat_queries_list( database_rec.id ) ; 
	
	FOR pg_stat_rec IN
	SELECT * 
	FROM mvw_pg_stat_queries 
	LOOP
	  INSERT INTO pg_stat_db_queries
	  ( database_id , queryid , query , max_time )
	  VALUES
	  ( database_rec.id , pg_stat_rec.queryid , pg_stat_rec.query , pg_stat_rec.max_time);
	END LOOP;     
  END LOOP; 

  RETURN TRUE;
END
$$ LANGUAGE plpgsql;

Bi abajade, tabili ni awọn ọrọ ibeere ti o ṣe deede, ibeere ibeere, ati akoko ipaniyan ibeere ti o pọju ni akoko lọwọlọwọ (ti a lo fun ibojuwo).

Kikun log_query ati ipilẹṣẹ itan-akọọlẹ ti awọn ero ipaniyan.

Ọrọ ibeere gangan ni a mu lati faili log. Wọle faili lati ibi-afẹde ibi-afẹde si agbalejo ibojuwo ni awọn apakan, nipasẹ iwe afọwọkọ bash, nipasẹ cron. Lati ṣafipamọ aaye ati nitori aibikita ti iṣẹ-ṣiṣe ti didakọ nkan ti faili ọrọ lati ọdọ agbalejo si gbalejo, ko pese iwe afọwọkọ naa.

Ṣiṣayẹwo faili log ati ṣe afihan ọrọ ibeere naa

#!/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

Olugbejade tabili 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;

Bi abajade, tabili ni ọrọ ibeere gangan, awọn ero ipaniyan, iye hash ti ero ipaniyan, ati iye hash ti ọrọ ibeere naa.

Fọwọsi iye queryid ninu tabili 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 has updated by 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 = 'WARNING : Not FOUND queryid for the query : '||query_text ;
			
			RAISE NOTICE '%',activity_string;	
				
			PERFORM pg_log( 999 , 'update_history_pg_stat_activity_by_queryid' , activity_string); 
		END IF ;
		
	RAISE NOTICE 'UPDATE log_query if query has not logged in log-file';
		
  END LOOP;
  
  RETURN result ;
END
$$ LANGUAGE plpgsql;

Bi abajade, tabili ni iye ibeere ti o baamu si iye ibeere ti ibeere naa.

Abajade

Nipa sisopọ pg_stat_activity, pg_stat_statements, log_query, o le gba ọpọlọpọ alaye to wulo nipa ibeere naa, ni pataki:

  • Itan ti awọn eto ipaniyan.
  • Sipiyu-akoko itan ti awọn ìbéèrè.
  • Beere itan idaduro.

Awọn data ati ọpọlọpọ awọn ijabọ afikun ni yoo ṣe apejuwe ninu nkan ti nbọ.

Idagbasoke

Nipa sisopọ alaye ti o wa pẹlu itan-akọọlẹ ti wiwo pg_locks, o le gba alaye nipa kini titiipa kan pato ti ibeere naa n duro de ati, pataki julọ, ilana wo (ibeere) ti o ṣe titiipa yii.

Ojutu si iṣoro yii yoo jẹ apejuwe ninu nkan ti o tẹle. Idanwo ati isọdọtun ti nlọ lọwọ lọwọlọwọ.

orisun: www.habr.com

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