系统CentOS 6.4 64bit,pgsql9.2版本数据库目录为 /data/pgsql/data
安装pgsql9.3：
# rpm -ivh http://yum.pgrpms.org/9.3/redhat/rhel-6-x86_64/pgdg-centos93-9.3-1.noarch.rpm
# yum install postgresql93 postgresql93-libs postgresql93-server postgresql93-contrib postgresql93-devel postgresql93-test更新环境变量 ~/.bash_profile:
PATH=$PATH:$HOME/bin:/usr/pgsql-9.3/bin修改为预期路径
PGDATA=/data/pgsql/data93
PGLOG=/data/pgsql/pgstartup.log
创建新数据库集群目录
# mkdir /data/psql/data93
# chown postgres:postgres /data/psql/data93# su - postgres
-bash-4.1$ /usr/pgsql-9.3/bin/initdb -E utf8 --locale=zh_CN.UTF8 -D /data/pgsql/data93/-bash-4.1$ /usr/pgsql-9.3/bin/pg_upgrade -d /data/pgsql/data -D /data/pgsql/data93/ \
-b /usr/pgsql-9.2/bin -B /usr/pgsql-9.3/binPerforming Consistency Checks
-----------------------------
Checking cluster versions ok
Checking database user is a superuser ok
Checking for prepared transactions ok
Checking for reg* system OID user data types ok
Checking for contrib/isn with bigint-passing mismatch ok
Creating dump of global objects ok
Creating dump of database schemas
ok
Checking for presence of required libraries ok
Checking database user is a superuser ok
Checking for prepared transactions ok
If pg_upgrade fails after this point, you must re-initdb the
new cluster before continuing.
Performing Upgrade
------------------
Analyzing all rows in the new cluster ok
Freezing all rows on the new cluster ok
Deleting files from new pg_clog ok
Copying old pg_clog to new server ok
Setting next transaction ID for new cluster ok
Setting oldest multixact ID on new cluster ok
Resetting WAL archives ok
Setting frozenxid counters in new cluster ok
Restoring global objects in the new cluster ok
Adding support functions to new cluster ok
Restoring database schemas in the new cluster
ok
Removing support functions from new cluster ok
Copying user relation files
ok
Setting next OID for new cluster ok
Sync data directory to disk ok
Creating script to analyze new cluster ok
Creating script to delete old cluster ok
Upgrade Complete
----------------
Optimizer statistics are not transferred by pg_upgrade so,
once you start the new server, consider running:
analyze_new_cluster.sh
Running this script will delete the old cluster's data files:
delete_old_cluster.sh把老版本的配置文件，如pg_hba.conf，pg_ident.conf，postgresql.conf直接复制或者同步更新到新版数据库集群目录中
相关升级文档 /usr/share/doc/postgresql93-9.3.0/README.rpm-dist
升级完成
Add: pg_hba.conf的设置可能会使得pg_upgrade执行时报无法连接数据库错误。这时候可以把local小节暂时改为trust来解决
