PostgreSQL 9.6 正式版发布了。
此次更新内容：
New system views and functions: pg_stat_wal_receiver, pg_visibility, pg_config, pg_blocking_pids, pg_notification_queue_usage
Command progress reporting support
Cascade support for installing extensions
pg_basebackup concurrency and replication slot support
Wait Event support
View editing and crosstabs in psql
User-defined expiration for old snapshots
Index-only scans for partial indexes
