We have already known that there're 4 states in life cycle of an instance. They are idle, nomount, mount and open. In this post, we… Read More »Database States Differentiations in Oracle
Since 11g, we rely more and more on SCAN Virtual IP to load balance and failover connections among nodes of a cluster, so the original… Read More »How Oracle RAC VIP Failover to Another Node
Connect as SYSDBA We usually connect to the database by / as SYSDBA without providing any password for maintenance works, such as startup, shutdown and… Read More »Connect to PDB as SYSDBA by ORACLE_PDB_SID
ORA-28002 ORA-28002 means that the password of the user will expire soon in X days, although the user is allowable to connect to the database.… Read More »How to Resolve ORA-28002: the password will expire within days
ORA-01017 ORA-01017 means that you either provided an incorrect pair of username and password, or mismatched authentication protocol, so the database that you tried to… Read More »How to Resolve ORA-01017: invalid username/password; logon denied
32-bit or 64-bit In some situations, we need to know whether our Oracle client is 32-bit or 64-bit in order to use the right tool… Read More »How to Check Oracle Client Version 32-bit or 64-bit
Connected to an idle instance Actually, Connected to an idle instance is a message rather than an error, it indicates that the database you entered… Read More »How to Resolve "Connected to an idle instance"