Creating standby redo log files is a recommended way of configuring dataguard in Oracle database environment. If there is any discrepancy found in standby redo log configuration, you might face ORA-16789 warning. While checking status of dataguard configuration through DGMGRL command, following is that you might see as an example, in a dataguard broker configuration.
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Monday, August 21, 2023
Thursday, August 10, 2023
ORA-12578: TNS:wallet open failed
[oracle]$
sqlplus |
Sunday, June 25, 2023
ORA-16000: database or pluggable database open for read-only access
I faced this error message when I tried to drop a table from my PDB which was opened in read-write mode without any restriction.
SQL> drop table test; |
Saturday, June 10, 2023
ORA-65179: cannot keep datafiles for a pluggable database that is not unplugged
You should use “including
datafiles” clause while dropping a pluggable database otherwise ORA-65179 would
be returned
SQL> drop pluggable database testpdb; |
Saturday, June 3, 2023
ORA-65342: source pluggable database has unrecovered transaction
Starting 12.2, if you are planning to clone a PDB locally or remotely, you can do that while source PDB is open in read-write mode (hot cloning). In 12.1, if you start your CREATE PLUGGABLE DATABASE command while a transaction is already active in the source PB, you will be returned ORA-65342. Therefore, the better option is to close the source PDB, and then start it as read-only so that no transactions could hinder the cloning process
Friday, May 26, 2023
ORA-65040: operation not allowed from within a pluggable database
Starting 12c, after introduction of pluggable databases, there are certain operations that can be performed only at the root container level. If you try to execute that operation/SQL within the PDB, you will receive ORA-65040. In this case you must ensure that the command you are executing is being executed at the root container level. Following is only one example of such operations that can only be performed from the root container.
Friday, May 19, 2023
Listener log file is empty and logging not happening
If listener log file is empty and no logging records are being logged in the log file, this probably means that someone truncate listener log file on the fly without following proper process. In Windows OS, you can not modify or truncate a file (listener log file in this case) that is in use by another proceess, however, Linux based OS would let you do this. After that, logging would no longer continue. Here I have explained the proper way of rotating listener log file. These instructions can be used for listener log file rotation as well as solving the issue of empty listener log file discussed here.
Tuesday, May 9, 2023
TNS-12508: TNS:listener could not resolve the COMMAND given
If you are in process of rotating listener log file and you receive TNS-12508 while disabling log_status, this means you have imposed admin restrictions in listener log file for this listener. Same error would be returned for any other settings you would want to change using “set” command from lsnrctl utility. In the following I have reproduced this error and explained how to set and unset admin restrictions in listner log file.
Rotating Listener Log File
Rotating
database log files is a common and day-to-day practice for DBAs. Rotation of
logs is a process whereby we rename (and archive/compress) current log files so
that new log files get created. Listener’s log file is also part of this
practice because size of listener log file increases very fast, and it may increase
beyond several GBs within a couple of months. If listener log file is not rotated,
this may sometimes cause initial connection to database become slow. Therefore,
this is very important to rotate listener log file. In the following I will
explain how we rotate listener log file.
Saturday, April 15, 2023
ORA-46697: Keystore password required
SQL> show pdbs |
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