Question

I am looking for a basic script/command that will create a copy of a live database (let name them mydb and mydb_test, both on the same server).

Requirements

• it has to run even if the mydb_test already exists and have records
• it has to work even if mydb and mydb_test do have existing connections
• it have to clean the potentially existing database if necessary

Hints:

• drop database cannot be used if you have existing connections

Answer 1

That’s what I was looking for, but I had to compile it myself 😛

I only wish I knew a way to keep the same user and not having to put it inside the script.

#!/bin/bash
DB_SRC=conf
DB_DST=conf_test
DB_OWNER=confuser

T="$(date +%s)"

psql -c "select pg_terminate_backend(procpid) from pg_stat_activity where datname='$DB_DST';" || { echo "disconnect users failed"; exit 1; }
psql -c "drop database if exists $DB_DST;" || { echo "drop failed"; exit 1; }
psql -c "create database $DB_DST owner confuser;" || { echo "create failed"; exit 1; }
pg_dump $DB_SRC|psql $DB_DST || { echo "dump/restore failed"; exit 1; }

T="$(($(date +%s)-T))"
echo "Time in seconds: ${T}"