Update Lab-pg_upgrade.md

Author: chandan-denvr

Lab-pg_upgrade.md

@@ -2,58 +2,63 @@
 
 ## Install pg 9.6 as major
 
+```
+
  yum install -y https://download.postgresql.org/pub/repos/yum/reporpms/EL-7-x86_64/pgdg-redhat-repo-latest.noarch.rpm
  yum install -y postgresql96 postgresql96-server postgresql96-contrib wget
  /usr/pgsql-9.6/bin/postgresql96-setup initdb
  systemctl start postgresql-9.6
  systemctl status postgresql-9.6
-
+```
 
 ## Create sampledatabase
+```
  su - postgres
 psql
 \password
 CREATE DATABASE sampledatabase;
 \q
-
+```
 ## instering sample dataset
-
+```
 wget https://raw.githubusercontent.com/morenoh149/postgresDBSamples/master/worldDB-1.0/world.sql
 psql -d sampledatabase -f world.sql
-
+```
 # varify that database was imported
-
+```
 psql
 \l
 \c sampledatabase
 \dt
 \q
-
+```
 ## Stop postgresql servers
+```
 systemctl stop postgresql-9.6
-
+```
 ## installing version 12
-
+```
 yum install -y postgresql12 postgresql12-contrib postgresql12-server 
 /usr/pgsql-12/bin/postgresql-12-setup initdb
-
+```
 ## executing pg_upgrade from new version binary
-
+```
 /usr/pgsql-12/bin/pg_upgrade --check \
 --old-datadir=/var/lib/pgsql/9.6/data \
 --new-datadir=/var/lib/pgsql/12/data \
 --old-bindir=/usr/pgsql-9.6/bin \
 --new-bindir /usr/pgsql-12/bin
-
+```
 # run same upgrade without --check option
-
+```
 /usr/pgsql-12/bin/pg_upgrade \
 --old-datadir=/var/lib/pgsql/9.6/data \
 --new-datadir=/var/lib/pgsql/12/data \
 --old-bindir=/usr/pgsql-9.6/bin \
 --new-bindir /usr/pgsql-12/bin
-
+```
 ## varify data was inserted into new databse after starting postgresql server
-
+```
  systemctl start postgresql-12
- systemctl status postgresql-12
+ systemctl status postgresql-12
+ ```