SQLPlus Connect and Disconnect
SQLPlus Connect To connect a database, we usually use sqlplus, a text-based connection tool provided by Oracle to facilitate clients to connect to a running… Read More »SQLPlus Connect and Disconnect
TNSNAMES
TNSNAMES, How and Why
Local Naming = TNSNAMES Whenever we need to connect to the database, we usually provide a connection string like this: SQL> conn username/password@chicago-db-server:1521/ORCL Connected. Or… Read More »TNSNAMES, How and Why
How to Resolve ORA-12154: TNS:could not resolve the connect identifier specified
ORA-12154 ORA-12154 means that your connection tools (e.g. sqlplus) cannot use TNSNAMES naming method for some reason. This reminds me that there're same error patterns… Read More »How to Resolve ORA-12154: TNS:could not resolve the connect identifier specified
SQLPlus Connect without Tnsnames
SQLPlus without Tnsnames We usually connect a database by sqlplus through tnsnames.ora, but sometimes we are not allowable to change or access tnsnames.ora, even worse,… Read More »SQLPlus Connect without Tnsnames
Connect-Time Failover to Standby Database
We're going to introduce 3 ways that can failover to a standby database at connect-time in this post. Using a Persistent Service Name Using a… Read More »Connect-Time Failover to Standby Database
How to Resolve TNS-03505: Failed to resolve name
TNS-03505 Failing to resolve TNS names could involve any one of the network configuration files, such as tnsnames.ora or sqlnet.ora. There're several possible causes may… Read More »How to Resolve TNS-03505: Failed to resolve name
How to expdp AS SYSDBA without Password
expdp AS SYSDBA Normally, we use system to migrate data from one to another, who has pretty enough privileges for all kinds of manipulation at… Read More »How to expdp AS SYSDBA without Password