Noma i-tetrisology encane esetshenzisiwe.
Konke okusha ukhohliwe kahle kudala.
Ama-Epigraphs.
Ukwakheka kwenkinga
Udinga ukulanda ngezikhathi ezithile ifayela lokungena le-PostgreSQL lamanje ukusuka efwini le-AWS uliyise kumsingathi wakho wasendaweni we-Linux. Hhayi ngesikhathi sangempela, kodwa, ake sithi, ngokubambezeleka okuncane.
Isikhathi sokulanda isibuyekezo sefayela lokungena imizuzu emi-5.
Ifayela lokungena ku-AWS lizungeziswa njalo ngehora.
Amathuluzi asetshenzisiwe
Ukulanda ifayela lokungena kumsingathi, kusetshenziswa iskripthi se-bash esibiza i-AWS API "".
Amapharamitha:
- -db-isibonelo-isikhombi: AWS igama lesibonelo;
- --log-file-name: igama lefayela lokungena elakhiwe njengamanje
- --max-item: Isamba senani lezinto ezibuyisiwe ekukhishweni komyalo.Usayizi wengxenye wefayela elilandiwe.
- --starting-token: Ithokheni yokuqala
Kulesi simo, umsebenzi wokulayisha izingodo uvele ngesikhathi somsebenzi
Futhi kulula - umsebenzi othokozisayo wokuqeqeshwa nokuhlukahluka ngesikhathi samahora okusebenza.
Ngizothatha ngokuthi inkinga isivele ixazululiwe ngenxa yokuphila kwansuku zonke. Kodwa i-Google esheshayo ayizange iphakamise noma yiziphi izixazululo, futhi angizange ngibe nesifiso esikhulu sokusesha ngokujula okwengeziwe. Noma iyiphi indlela, kuwukuzivocavoca okuhle.
Ukwenziwa ngokusemthethweni komsebenzi
Ifayela lokungena lokugcina liqukethe imigqa eminingi yobude obuguquguqukayo. Ngokwesithombe, ifayela lokungena lingamelwa into enjengale:
Ingabe kakade kukukhumbuza okuthile? UTetris uhlangana ngani nakho? Futhi nakhu okuhlobene nakho.
Uma sicabanga izinketho ezingase zivele lapho kulayishwa ifayela elilandelayo ngemidwebo (ukuze kube lula, kulokhu, imigqa mayibe nobude obufanayo), sithola Izingcezu ze-Tetris ezijwayelekile:
1) Ifayela lilandwa lilonke futhi elokugcina. Usayizi wengxenye mkhulu kunosayizi wokugcina wefayela:
2) Ifayela liyaqhubeka. Usayizi we-chunk mncane kunosayizi wefayela wokugcina:
3) Ifayela liwukuqhutshekwa kwefayela langaphambilini futhi linokuqhubeka. Usayizi we-chunk mncane kunosayizi wensalela yefayela lokugcina:
I-4) Ifayela liwukuqhubeka kwefayela langaphambilini futhi lingelokugcina. Usayizi we-chunk mkhulu kunosayizi wensalela yefayela lokugcina:
Umsebenzi uwukuhlanganisa unxande noma ukudlala i-Tetris ezingeni elisha.
Izinkinga eziphakamayo ngenkathi kuxazululwa inkinga
1) Namathisela intambo yezingcezu ezi-2
Ngokuvamile, azikho izinkinga ezikhethekile. Inkinga ejwayelekile evela esifundweni sokuqala sokuhlela.
Usayizi wokuphakela olungile
Kodwa lokhu kuyathakazelisa kancane.
Ngeshwa, ayikho indlela yokusebenzisa i-offset ngemva kwelebula yengxenye yokuqala:
Njengoba usuyazi inketho -ithokheni yokuqala isetshenziselwa ukucacisa ukuthi ungaqala kuphi ukwenza iphethini. Le nketho ithatha amanani e-String okungasho ukuthi uma uzama ukungeza inani le-offset phambi kweyunithi yezinhlamvu ye-Next Token, inketho ngeke icatshangelwe njenge-offset.
Ngakho-ke, kufanele ukufunde ngeziqephu.
Uma ufunda ngezingxenye ezinkulu, inani lokufundwayo lizoba lincane, kodwa ivolumu izoba ephezulu.
Uma ufunda ezingxenyeni ezincane, ngokuphambene nalokho, inani lokufundwa lizoba liphezulu, kodwa ivolumu izoba yincane.
Ngakho-ke, ukuze kuncishiswe ithrafikhi kanye nobuhle obuphelele besixazululo, kwadingeka ngiqhamuke nesixazululo, ngeshwa, esibukeka kancane njenge-crutch.
Ukwenza umzekeliso, ake sicabangele inqubo yokulanda ifayela lokungena ezinguqulweni ezi-2 ezenziwe lula kakhulu. Inani lokufundwa kuzo zombili izimo lincike kusayizi wengxenye.
1) Layisha ngezingxenye ezincane:
2) Layisha ngezingxenye ezinkulu:
Njengenjwayelo, ikhambi elilungile liphakathi.
Ubukhulu bokukhonza buncane, kodwa phakathi nenqubo yokufunda, ubukhulu bunganyuswa ukuze kuncishiswe inani lokufundwayo.
Kufanele kuqashelwe ukuthi inkinga yokukhetha usayizi ofanele wengxenye efundekayo ayikaxazululwa futhi idinga ukucwaninga nokuhlaziya okujulile. Mhlawumbe ngemva kwesikhashana.
Incazelo ejwayelekile yokuqaliswa
Amathebula esevisi asetshenzisiwe
CREATE TABLE endpoint
(
id SERIAL ,
host text
);
TABLE database
(
id SERIAL ,
β¦
last_aws_log_time text ,
last_aws_nexttoken text ,
aws_max_item_size integer
);
last_aws_log_time β Π²ΡΠ΅ΠΌΠ΅Π½Π½Π°Ρ ΠΌΠ΅ΡΠΊΠ° ΠΏΠΎΡΠ»Π΅Π΄Π½Π΅Π³ΠΎ Π·Π°Π³ΡΡΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ Π»ΠΎΠ³-ΡΠ°ΠΉΠ»Π° Π² ΡΠΎΡΠΌΠ°ΡΠ΅ YYYY-MM-DD-HH24.
last_aws_nexttoken β ΡΠ΅ΠΊΡΡΠΎΠ²Π°Ρ ΠΌΠ΅ΡΠΊΠ° ΠΏΠΎΡΠ»Π΅Π΄Π½Π΅ΠΉ Π·Π°Π³ΡΡΠΆΠ΅Π½Π½ΠΎΠΉ ΠΏΠΎΡΡΠΈΠΈ.
aws_max_item_size- ΡΠΌΠΏΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠΌ ΠΏΡΡΠ΅ΠΌ, ΠΏΠΎΠ΄ΠΎΠ±ΡΠ°Π½Π½ΡΠΉ Π½Π°ΡΠ°Π»ΡΠ½ΡΠΉ ΡΠ°Π·ΠΌΠ΅Ρ ΠΏΠΎΡΡΠΈΠΈ.
Umbhalo ogcwele wombhalo
download_aws_piece.sh
#!/bin/bash
#########################################################
# download_aws_piece.sh
# downloan piece of log from AWS
# version HABR
let min_item_size=1024
let max_item_size=1048576
let growth_factor=3
let growth_counter=1
let growth_counter_max=3
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh:''STARTED'
AWS_LOG_TIME=$1
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh:AWS_LOG_TIME='$AWS_LOG_TIME
database_id=$2
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh:database_id='$database_id
RESULT_FILE=$3
endpoint=`psql -h MONITOR_ENDPOINT.rds.amazonaws.com -U USER -d MONITOR_DATABASE_DATABASE -A -t -c "select e.host from endpoint e join database d on e.id = d.endpoint_id where d.id = $database_id "`
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh:endpoint='$endpoint
db_instance=`echo $endpoint | awk -F"." '{print toupper($1)}'`
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh:db_instance='$db_instance
LOG_FILE=$RESULT_FILE'.tmp_log'
TMP_FILE=$LOG_FILE'.tmp'
TMP_MIDDLE=$LOG_FILE'.tmp_mid'
TMP_MIDDLE2=$LOG_FILE'.tmp_mid2'
current_aws_log_time=`psql -h MONITOR_ENDPOINT.rds.amazonaws.com -U USER -d MONITOR_DATABASE -A -t -c "select last_aws_log_time from database where id = $database_id "`
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh:current_aws_log_time='$current_aws_log_time
if [[ $current_aws_log_time != $AWS_LOG_TIME ]];
then
is_new_log='1'
if ! psql -h MONITOR_ENDPOINT.rds.amazonaws.com -U USER -d MONITOR_DATABASE -v ON_ERROR_STOP=1 -A -t -q -c "update database set last_aws_log_time = '$AWS_LOG_TIME' where id = $database_id "
then
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: FATAL_ERROR - update database set last_aws_log_time .'
exit 1
fi
else
is_new_log='0'
fi
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh:is_new_log='$is_new_log
let last_aws_max_item_size=`psql -h MONITOR_ENDPOINT.rds.amazonaws.com -U USER -d MONITOR_DATABASE -A -t -c "select aws_max_item_size from database where id = $database_id "`
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: last_aws_max_item_size='$last_aws_max_item_size
let count=1
if [[ $is_new_log == '1' ]];
then
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: START DOWNLOADING OF NEW AWS LOG'
if ! aws rds download-db-log-file-portion
--max-items $last_aws_max_item_size
--region REGION
--db-instance-identifier $db_instance
--log-file-name error/postgresql.log.$AWS_LOG_TIME > $LOG_FILE
then
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: FATAL_ERROR - Could not get log from AWS .'
exit 2
fi
else
next_token=`psql -h MONITOR_ENDPOINT.rds.amazonaws.com -U USER -d MONITOR_DATABASE -v ON_ERROR_STOP=1 -A -t -c "select last_aws_nexttoken from database where id = $database_id "`
if [[ $next_token == '' ]];
then
next_token='0'
fi
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: CONTINUE DOWNLOADING OF AWS LOG'
if ! aws rds download-db-log-file-portion
--max-items $last_aws_max_item_size
--starting-token $next_token
--region REGION
--db-instance-identifier $db_instance
--log-file-name error/postgresql.log.$AWS_LOG_TIME > $LOG_FILE
then
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: FATAL_ERROR - Could not get log from AWS .'
exit 3
fi
line_count=`cat $LOG_FILE | wc -l`
let lines=$line_count-1
tail -$lines $LOG_FILE > $TMP_MIDDLE
mv -f $TMP_MIDDLE $LOG_FILE
fi
next_token_str=`cat $LOG_FILE | grep NEXTTOKEN`
next_token=`echo $next_token_str | awk -F" " '{ print $2}' `
grep -v NEXTTOKEN $LOG_FILE > $TMP_FILE
if [[ $next_token == '' ]];
then
cp $TMP_FILE $RESULT_FILE
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: NEXTTOKEN NOT FOUND - FINISH '
rm $LOG_FILE
rm $TMP_FILE
rm $TMP_MIDDLE
rm $TMP_MIDDLE2
exit 0
else
psql -h MONITOR_ENDPOINT.rds.amazonaws.com -U USER -d MONITOR_DATABASE -v ON_ERROR_STOP=1 -A -t -q -c "update database set last_aws_nexttoken = '$next_token' where id = $database_id "
fi
first_str=`tail -1 $TMP_FILE`
line_count=`cat $TMP_FILE | wc -l`
let lines=$line_count-1
head -$lines $TMP_FILE > $RESULT_FILE
###############################################
# MAIN CIRCLE
let count=2
while [[ $next_token != '' ]];
do
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: count='$count
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: START DOWNLOADING OF AWS LOG'
if ! aws rds download-db-log-file-portion
--max-items $last_aws_max_item_size
--starting-token $next_token
--region REGION
--db-instance-identifier $db_instance
--log-file-name error/postgresql.log.$AWS_LOG_TIME > $LOG_FILE
then
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: FATAL_ERROR - Could not get log from AWS .'
exit 4
fi
next_token_str=`cat $LOG_FILE | grep NEXTTOKEN`
next_token=`echo $next_token_str | awk -F" " '{ print $2}' `
TMP_FILE=$LOG_FILE'.tmp'
grep -v NEXTTOKEN $LOG_FILE > $TMP_FILE
last_str=`head -1 $TMP_FILE`
if [[ $next_token == '' ]];
then
concat_str=$first_str$last_str
echo $concat_str >> $RESULT_FILE
line_count=`cat $TMP_FILE | wc -l`
let lines=$line_count-1
tail -$lines $TMP_FILE >> $RESULT_FILE
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: NEXTTOKEN NOT FOUND - FINISH '
rm $LOG_FILE
rm $TMP_FILE
rm $TMP_MIDDLE
rm $TMP_MIDDLE2
exit 0
fi
if [[ $next_token != '' ]];
then
let growth_counter=$growth_counter+1
if [[ $growth_counter -gt $growth_counter_max ]];
then
let last_aws_max_item_size=$last_aws_max_item_size*$growth_factor
let growth_counter=1
fi
if [[ $last_aws_max_item_size -gt $max_item_size ]];
then
let last_aws_max_item_size=$max_item_size
fi
psql -h MONITOR_ENDPOINT.rds.amazonaws.com -U USER -d MONITOR_DATABASE -A -t -q -c "update database set last_aws_nexttoken = '$next_token' where id = $database_id "
concat_str=$first_str$last_str
echo $concat_str >> $RESULT_FILE
line_count=`cat $TMP_FILE | wc -l`
let lines=$line_count-1
#############################
#Get middle of file
head -$lines $TMP_FILE > $TMP_MIDDLE
line_count=`cat $TMP_MIDDLE | wc -l`
let lines=$line_count-1
tail -$lines $TMP_MIDDLE > $TMP_MIDDLE2
cat $TMP_MIDDLE2 >> $RESULT_FILE
first_str=`tail -1 $TMP_FILE`
fi
let count=$count+1
done
#
#################################################################
exit 0
Izingcezu zesikripthi ezinezincazelo ezithile:
Imingcele yokufaka umbhalo:
- Isitembu sesikhathi segama lefayela lokungena ngefomethi YYYY-MM-DD-HH24: AWS_LOG_TIME=$1
- I-ID yesizindalwazi: database_id=$2
- Igama lefayela lokungena eliqoqiwe: RESULT_FILE=$3
Thola isitembu sesikhathi sefayela lokungena elilayishiwe lokugcina:
current_aws_log_time=`psql -h MONITOR_ENDPOINT.rds.amazonaws.com -U USER -d MONITOR_DATABASE -A -t -c "select last_aws_log_time from database where id = $database_id "`Uma isitembu sesikhathi sefayela lokungena elilayishiwe singafani nepharamitha yokufaka, ifayela lokungena elisha liyalayishwa:
if [[ $current_aws_log_time != $AWS_LOG_TIME ]];
then
is_new_log='1'
if ! psql -h ENDPOINT.rds.amazonaws.com -U USER -d MONITOR_DATABASE -v ON_ERROR_STOP=1 -A -t -c "update database set last_aws_log_time = '$AWS_LOG_TIME' where id = $database_id "
then
echo '***download_aws_piece.sh -FATAL_ERROR - update database set last_aws_log_time .'
exit 1
fi
else
is_new_log='0'
fi
Sithola inani lelebula ye-nexttoken efayeleni elilandiwe:
next_token_str=`cat $LOG_FILE | grep NEXTTOKEN`
next_token=`echo $next_token_str | awk -F" " '{ print $2}' `
Inani lethokheni elingenalutho lisebenza njengophawu lokuphela kokulanda.
Kuluphu, sibala izingxenye zefayela, sihlanganise imigqa endleleni futhi sikhulise usayizi wengxenye:
Iluphu eyinhloko
# MAIN CIRCLE
let count=2
while [[ $next_token != '' ]];
do
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: count='$count
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: START DOWNLOADING OF AWS LOG'
if ! aws rds download-db-log-file-portion
--max-items $last_aws_max_item_size
--starting-token $next_token
--region REGION
--db-instance-identifier $db_instance
--log-file-name error/postgresql.log.$AWS_LOG_TIME > $LOG_FILE
then
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: FATAL_ERROR - Could not get log from AWS .'
exit 4
fi
next_token_str=`cat $LOG_FILE | grep NEXTTOKEN`
next_token=`echo $next_token_str | awk -F" " '{ print $2}' `
TMP_FILE=$LOG_FILE'.tmp'
grep -v NEXTTOKEN $LOG_FILE > $TMP_FILE
last_str=`head -1 $TMP_FILE`
if [[ $next_token == '' ]];
then
concat_str=$first_str$last_str
echo $concat_str >> $RESULT_FILE
line_count=`cat $TMP_FILE | wc -l`
let lines=$line_count-1
tail -$lines $TMP_FILE >> $RESULT_FILE
echo $(date +%Y%m%d%H%M)': download_aws_piece.sh: NEXTTOKEN NOT FOUND - FINISH '
rm $LOG_FILE
rm $TMP_FILE
rm $TMP_MIDDLE
rm $TMP_MIDDLE2
exit 0
fi
if [[ $next_token != '' ]];
then
let growth_counter=$growth_counter+1
if [[ $growth_counter -gt $growth_counter_max ]];
then
let last_aws_max_item_size=$last_aws_max_item_size*$growth_factor
let growth_counter=1
fi
if [[ $last_aws_max_item_size -gt $max_item_size ]];
then
let last_aws_max_item_size=$max_item_size
fi
psql -h MONITOR_ENDPOINT.rds.amazonaws.com -U USER -d MONITOR_DATABASE -A -t -q -c "update database set last_aws_nexttoken = '$next_token' where id = $database_id "
concat_str=$first_str$last_str
echo $concat_str >> $RESULT_FILE
line_count=`cat $TMP_FILE | wc -l`
let lines=$line_count-1
#############################
#Get middle of file
head -$lines $TMP_FILE > $TMP_MIDDLE
line_count=`cat $TMP_MIDDLE | wc -l`
let lines=$line_count-1
tail -$lines $TMP_MIDDLE > $TMP_MIDDLE2
cat $TMP_MIDDLE2 >> $RESULT_FILE
first_str=`tail -1 $TMP_FILE`
fi
let count=$count+1
done
Yini elandelayo?
Ngakho-ke, umsebenzi wokuqala ophakathi - "landa ifayela lokungena efwini" usuxazululiwe. Yini okufanele uyenze ngelogi elandiwe?
Okokuqala, udinga ukuhlaziya ifayela lokungena bese ukhipha izicelo zangempela kulo.
Umsebenzi awunzima kakhulu. Isikripthi se-bash esilula senza umsebenzi kahle kakhulu.
upload_log_query.sh
#!/bin/bash
#########################################################
# upload_log_query.sh
# Upload table table from dowloaded aws file
# version HABR
###########################################################
echo 'TIMESTAMP:'$(date +%c)' Upload log_query table '
source_file=$1
echo 'source_file='$source_file
database_id=$2
echo 'database_id='$database_id
beginer=' '
first_line='1'
let "line_count=0"
sql_line=' '
sql_flag=' '
space=' '
cat $source_file | while read line
do
line="$space$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}' `
if [[ $current_beginer == $beginer ]]; then
if [[ $sql_flag == '1' ]]; then
sql_flag='0'
log_date=`echo $sql_line | awk -F" " '{ print $1}' `
log_time=`echo $sql_line | awk -F" " '{ print $2}' `
duration=`echo $sql_line | awk -F" " '{ print $5}' `
#replace ' to ''
sql_modline=`echo "$sql_line" | sed 's/'''/''''''/g'`
sql_line=' '
################
#PROCESSING OF THE SQL-SELECT IS HERE
if ! psql -h ENDPOINT.rds.amazonaws.com -U USER -d DATABASE -v ON_ERROR_STOP=1 -A -t -c "select log_query('$ip_port',$database_id , '$log_date' , '$log_time' , '$duration' , '$sql_modline' )"
then
echo 'FATAL_ERROR - log_query '
exit 1
fi
################
fi #if [[ $sql_flag == '1' ]]; then
let "line_count=line_count+1"
check=`echo $line | awk -F" " '{ print $8}' `
check_sql=${check^^}
#echo 'check_sql='$check_sql
if [[ $check_sql == 'SELECT' ]]; then
sql_flag='1'
sql_line="$sql_line$line"
ip_port=`echo $sql_line | awk -F":" '{ print $4}' `
fi
else
if [[ $sql_flag == '1' ]]; then
sql_line="$sql_line$line"
fi
fi #if [[ $current_beginer == $beginer ]]; then
done
Manje usungasebenza ngesicelo esikhethwe kufayela lokungena.
Futhi amathuba amaningana awusizo avuleka.
Imibuzo ehlaziyiwe idinga ukugcinwa ndawana thize. Itafula lesevisi lisetshenziselwa lokhu log_query
CREATE TABLE log_query
(
id SERIAL ,
queryid bigint ,
query_md5hash text not null ,
database_id integer not null ,
timepoint timestamp without time zone not null,
duration double precision not null ,
query text not null ,
explained_plan text[],
plan_md5hash text ,
explained_plan_wo_costs text[],
plan_hash_value text ,
baseline_id integer ,
ip text ,
port text
);
ALTER TABLE log_query ADD PRIMARY KEY (id);
ALTER TABLE log_query ADD CONSTRAINT queryid_timepoint_unique_key UNIQUE (queryid, timepoint );
ALTER TABLE log_query ADD CONSTRAINT query_md5hash_timepoint_unique_key UNIQUE (query_md5hash, timepoint );
CREATE INDEX log_query_timepoint_idx ON log_query (timepoint);
CREATE INDEX log_query_queryid_idx ON log_query (queryid);
ALTER TABLE log_query ADD CONSTRAINT database_id_fk FOREIGN KEY (database_id) REFERENCES database (id) ON DELETE CASCADE ;
Isicelo esicutshunguliwe sicutshungulwa ku plgql imisebenzi "log_query".
log_query.sql
--log_query.sql
--verison HABR
CREATE OR REPLACE FUNCTION log_query( 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 ;
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 ;
BEGIN
result = TRUE ;
RAISE NOTICE '***log_query';
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 );
SELECT e.host , d.name , d.owner_pwd
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||' dbname='||database_rec.name||' user=DATABASE 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
)
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
);
activity_string = 'New query has logged '||
' database_id = '|| log_database_id ||
' query_md5hash='||log_md5hash||
' , timepoint = '||to_char(log_timepoint,'YYYYMMDD HH24:MI:SS');
RAISE NOTICE '%',activity_string;
PERFORM pg_log( log_database_id , 'log_query' , activity_string);
EXCEPTION
WHEN unique_violation THEN
RAISE NOTICE '*** unique_violation *** query already has logged';
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
RAISE NOTICE 'log_query with query_md5hash = % and timepoint = % has already has a QUERYID = %',log_md5hash,log_timepoint , log_queryid ;
RETURN result;
END IF;
------------------------------------------------
RAISE NOTICE 'Update queryid';
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;
--SELECT log_query_rec.query like pg_stat_query INTO found_flag ;
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
;
RAISE NOTICE '%',activity_string;
EXIT ;
END IF ;
END LOOP ;
RETURN result ;
END
$$ LANGUAGE plpgsql;
Ithebula lesevisi lisetshenziswa ngesikhathi sokucubungula pg_stat_db_queries, equkethe isifinyezo semibuzo yamanje evela kuthebula pg_stat_history (Ukusetshenziswa kwethebula kuchazwe lapha β )
TABLE pg_stat_db_queries
(
database_id integer,
queryid bigint ,
query text ,
max_time double precision
);
TABLE pg_stat_history
(
β¦
database_id integer ,
β¦
queryid bigint ,
β¦
max_time double precision ,
β¦
);
Umsebenzi ikuvumela ukuthi usebenzise inani lamakhono awusizo okucubungula izicelo ezivela kufayela lokungena. Okungukuthi:
Ithuba #1 - Umlando wokwenza kombuzo
Kuwusizo kakhulu ukuqala ukuxazulula isigameko sokusebenza. Okokuqala, jwayelana nomlando - ukwehla kwaqala nini?
Khona-ke, ngokusho kwama-classics, bheka izizathu zangaphandle. Mhlawumbe umthwalo we-database uvele wanda kakhulu futhi isicelo esithile asihlangene naso.
Engeza okufakiwe okusha kuthebula le-log_query
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 );
SELECT e.host , d.name , d.owner_pwd
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 = to_number(duration,'99999999999999999999D9999999999');
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);
RAISE NOTICE 'log_query=%',log_query ;
log_md5hash = md5( log_query::text );
--Explain execution plan--
EXECUTE 'SELECT dblink_connect(''LINK1'',''host='||database_rec.host||' dbname='||database_rec.name||' user=DATABASE 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
)
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
);
Okungenzeka #2 - Londoloza izinhlelo zokwenza umbuzo
Kuleli qophelo ukuphikiswa-incazelo-ukuphawula kungavela: βKodwa kukhona kakade autoexplain" Yebo, likhona, kodwa liyini iphuzu uma uhlelo lokubulawa lugcinwe kufayela lokungena elifanayo futhi ukuze ukulondolozele ukuhlaziywa okwengeziwe, kufanele uhlukanise ifayela lokungena?
Engangikudinga kwaba:
okokuqala: gcina uhlelo lokuqalisa kuthebula lesevisi lesizindalwazi sokuqapha;
okwesibili: ukukwazi ukuqhathanisa izinhlelo zokusebenza komunye nomunye ukuze ubone ngokushesha ukuthi uhlelo lokwenziwa kombuzo lushintshile.
Kunesicelo esinamapharamitha athile wokwenza. Ukuthola nokulondoloza uhlelo lwayo lokuqalisa usebenzisa i-EXPLAIN kuwumsebenzi oyisisekelo.
Ngaphezu kwalokho, usebenzisa isisho esithi CHACHAZA (IZINDLEKO EZINGAMANGA), ungathola uhlaka lwamathambo ohlelo, oluzosetshenziswa ukuthola inani le-hashi lohlelo, elizosiza ekuhlaziyweni okulandelanayo komlando wezinguquko ohlelweni lokwenziwa.
Thola isifanekiso sohlelo lokusebenza
--Explain execution plan--
EXECUTE 'SELECT dblink_connect(''LINK1'',''host='||database_rec.host||' dbname='||database_rec.name||' user=DATABASE 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');
Okungenzeka #3 - Ukusebenzisa ilogi yemibuzo ukuze kuqashwe
Njengoba amamethrikhi okusebenza awalungiswanga embhalweni wesicelo, kodwa ku-ID yawo, udinga ukuhlobanisa izicelo ezisuka kufayela lokungena nezicelo ezilungiselelwa amamethrikhi okusebenza.
Nokho, okungenani ukuze ube nesikhathi esiqondile sokwenzeka kwesigameko sokusebenza.
Ngale ndlela, uma kwenzeka isigameko sokusebenza se-ID yesicelo, kuzoba nesixhumanisi sesicelo esithile esinamanani athile epharamitha kanye nesikhathi esiqondile sokwenza kanye nobude besicelo. Thola lolu lwazi usebenzisa ukubuka kuphela pg_stat_statements - kwenqatshelwe.
Thola umbuzo wesicelo futhi ubuyekeze okufakile kuthebula le-log_query
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;
--SELECT log_query_rec.query like pg_stat_query INTO found_flag ;
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
;
RAISE NOTICE '%',activity_string;
EXIT ;
END IF ;
END LOOP ;
I-Afterword
Inqubo echazwe ekugcineni yathola ukusetshenziswa ku , okukuvumela ukuthi ube nolwazi olwengeziwe ongaluhlaziya lapho uxazulula izigameko zokuvela kokusebenza kombuzo.
Nakuba, yiqiniso, ngokombono wami siqu, kuzodingeka ukuthi usebenze kakhulu ku-algorithm yokukhetha nokushintsha usayizi wengxenye elandiwe. Inkinga ayikaxazululwa endabeni evamile. Cishe izothakazelisa.
Kodwa leyo indaba ehluke ngokuphelele...
Source: www.habr.com