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How to Resolve ORA-12528: TNS:listener: all appropriate instances are blocking new connections

by Ed Chen
June 14, 2021February 8, 2023
6 Comments

ORA-12528 Tried to connect a NOMOUNT database, but it failed with ORA-12528. C:\Users\ed>sqlplus sys/password@orcl as sysdba ... ERROR: ORA-12528: TNS:listener: all appropriate instances are blocking… Read More »

How RMAN Duplicate 19c Standby Database

by Ed Chen
August 11, 2019February 13, 2023
4 Comments

You don't have to create an empty database on the standby server for building a standby database. In this post, I will show you how… Read More »

How to Build Asymmetric Standby Database for Data Guard

by Ed Chen
July 14, 2019February 13, 2023
4 Comments

Asymmetric Data Guard Usually we build data guard environments with the symmetric architecture design on primary and standby servers, that is, single-instance to single-instance or… Read More »

Building a Physical Standby Database (02/14) - Prepare configuration files on both sides

by Ed Chen
November 14, 2012February 13, 2023

Building a Physical Standby Database (01/14) - Install an empty database on standbyThere are four configuration files needs to be prepared on both sides, the… Read More »

How to Connect Idle, Nomount or Restricted Database Remotely

by Ed Chen
October 10, 2012December 11, 2022

Connect an Idle, Nomount or Restricted Database Locally Users who belong to OSDBA or OSOPER can access a database in any states including idle, NOMOUNT… Read More »