feat: st2334 cheatsheet

cs3223/cs3223_assign1/part1.sh

@@ -0,0 +1,84 @@
+#!/usr/bin/env bash
+
+# CS3223 Assignment 1 Part 1 - Benchmarking PostgreSQL 17.2 (with Clock replacement policy)
+
+# IMPORTANT: You must edit the value of PGPORT variable in settings.sh before running this script
+
+set -euo pipefail
+
+source ./settings.sh
+
+# file to store benchmarking results
+RESULTFILE=${ASSIGN_DIR}/part1_result.txt
+
+# create PGDATA directory if it's missing
+if [ ! -e ${PGDATA} ]; then
+	if [ ! -d ${INSTALL_DIR}/bin ]; then
+		echo "ERROR: PostgreSQL installation missing!"
+		exit 1
+	fi
+	${INSTALL_DIR}/bin/initdb -D ${PGDATA}
+fi
+
+if pg_ctl status > /dev/null; then
+	pg_ctl stop
+fi
+
+pg_ctl start -l ${LOG_FILE} -o "-p ${PGPORT} -B 8192"
+
+# check that server is running
+if ! pg_ctl status > /dev/null; then
+	echo "ERROR: postgres server is not running!"
+	exit 1;
+fi
+
+
+# if database exists, drop database
+if psql -l | grep -q "${DBNAME}"; then
+	echo "Dropping database ${DBNAME} ..."
+	dropdb "${DBNAME}"
+fi
+
+echo "Creating database ${DBNAME} ..."
+createdb "${DBNAME}"
+
+
+# check that number of shared buffer pages is configured to 64MB
+if ! psql -c "SHOW shared_buffers;" ${DBNAME} | grep "64MB"; then
+	echo "ERROR: restart server using -B 8192!"
+	exit 1;
+fi
+
+
+# create benchmark database relations 
+NUM_CLIENTS=10
+SCALE_FACTOR=4
+DURATION=360 # 6 minutes
+pgbench -i -s ${SCALE_FACTOR} --unlogged-tables  ${DBNAME}
+
+
+
+# show size of shared buffers
+psql -c "show shared_buffers;" ${DBNAME}  >| ${RESULTFILE}
+
+# reset statistics counters 
+psql -c "SELECT pg_stat_reset();" ${DBNAME}
+
+echo >> ${RESULTFILE}
+date >> ${RESULTFILE}
+echo >> ${RESULTFILE}
+
+
+# run benchmark  test
+pgbench -c ${NUM_CLIENTS} -T ${DURATION} -j ${NUM_CLIENTS} -s ${SCALE_FACTOR} ${DBNAME} >> ${RESULTFILE}
+
+echo >> ${RESULTFILE}
+date >> ${RESULTFILE}
+echo >> ${RESULTFILE}
+
+
+# calculate buffer hit ratio
+psql -c "SELECT SUM(heap_blks_read) AS heap_read, SUM(heap_blks_hit)  AS heap_hit, SUM(heap_blks_hit) / (SUM(heap_blks_hit) + SUM(heap_blks_read))  AS hit_ratio FROM pg_statio_user_tables;" ${DBNAME} >> ${RESULTFILE}
+
+cat ${RESULTFILE}
+