May 17, 2026, 11:40 PM

inbox/DataBase/PostgreSQL/dba_scripts/connect_count.sh

@@ -0,0 +1,131 @@
+#!/bin/bash
+
+DBNAME="postgres"
+USER="-U postgres"
+PORT="-p 5432"
+
+usage() {
+    echo "Usage: $0 [-d <dbname> -h <host> -U <user> -p <port> u]"
+    exit 1
+}
+
+while getopts "d:h:p:uU:" OPT;
+do case "${OPT}" in
+      d) DBNAME=$OPTARG
+	 ;;
+      h) HOST="-h $OPTARG"
+	 ;;
+      p) PORT="-p $OPTARG"
+	 ;;
+      U) USER="-U $OPTARG"
+	 ;;
+      u) usage
+	 ;;
+    [?]) usage
+   esac;
+done
+
+
+set $(date '+%m%d')
+MMDD=$1
+
+LOGDIR='/var/log/postgresql'
+
+getver()
+{
+VER=$(psql $HOST $PORT $USER $DBNAME <<_QUERY_
+SELECT version();
+
+_QUERY_
+
+)
+
+#VER=$(cat ${PGDATA}/PG_VERSION)
+#use next line only if PGDATA has version in path
+#VER=$(echo $PGDATA | cut -d / -f 5)
+}
+
+clear
+
+getver
+echo "PostgreSQL Version is $VER"
+
+connect_cnts() {
+DBLIST=$(psql -q -t $HOST $PORT $USER $DBNAME <<_QUERY_
+
+SELECT d.datname
+  FROM pg_database d
+ WHERE datallowconn = TRUE
+   AND datistemplate = FALSE
+ ORDER BY 1;
+
+_QUERY_
+
+)
+
+
+}
+
+get_cnt() {
+
+
+CNT=$(psql -t $PORT $USER $DBNAME <<_QUERY_
+
+/*
+SELECT count(*)
+  FROM pg_stat_activity
+ WHERE datname = '$DB';
+*/
+SELECT usename,
+       count(*)
+  FROM pg_stat_activity
+ WHERE datname = '$DB'
+  GROUP BY usename;
+
+
+_QUERY_
+)
+
+}
+
+all_count() {
+CNT=$(psql -t $PORT $USER $DBNAME <<_QUERY_
+
+SELECT count(*)
+  FROM pg_stat_activity;
+
+_QUERY_
+)
+
+}
+
+###############################################################
+#			  MAIN				      #
+###############################################################
+
+connect_cnts
+
+for DB in $DBLIST;
+do
+ echo -n "$DB "
+get_cnt
+# grep -E -c "$DB.*connection auth" #LOGDIR/postgresql.${MMDD}
+echo -e "\t$CNT"
+done
+
+all_count
+echo
+echo -e "TOTAL \t\t$CNT"
+
+#exit 0
+
+#echo "$(hostname -f) CONNECTION COUNTS"
+#echo "Current log file is: $logdir/postgresql.$MMDD"
+#echo
+
+#for DB in $DBLIST
+#    do
+#	 echo -n "$DB: "
+#	 grep 'connection authorized' $LOGDIR/postgresql.${MMDD} | grep -c "$DB"
+#done
+#exit 0