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adrci – No ADR base is set
Some time ago we had a problem using the adrci (ADR Command Interpreter) to look into some diagnostic information for a listener. After staring up the tool it came back with the warning “No ADR base is set”, even while … Continue reading
Posted in Database
Tagged ADR, adrci, adrci_dir.mif, database, LinkedIn, oracle, troubleshooting
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Expired passwords in 11g database using 10g client
When I create a new user/schema in an Oracle database I specify a password and immediately use the PASSWORD EXPIRE clause to expire this one-time-use only password. This way I make sure the user/application who is going to use this … Continue reading
Dump interesting information about Oracle files
Here are some useful statements for generating trace files in your udump directory about various important Oracle files: Get a dump of your controlfiles: ALTER SESSION SET EVENTS ‘IMMEDIATE TRACE NAME CONTROLF LEVEL 10’; Dump the headers for all your … Continue reading
Unregistering (removing) agent from OEM Grid Control
When you want to permanently remove an agent from you OEM GC environment, you will have the GUI method and the manual method. The reason for writing this post is that I was able to remove all targets from within … Continue reading
Posted in Enterprise Manager
Tagged enterprise manager, grid control, LinkedIn, OEM, oracle
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Privileges for AWR reporting
Sometimes during a project there are people that would like to generate AWR reports. Here are the privilges on certain database objecs that a user needs to be able to generate such reports using SQL*Plus (in this case granted to … Continue reading
Posted in Database
Tagged AWR, database, DBMS_WORKLOAD_REPOSITORY, LinkedIn, oracle, privileges
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Simulating ORA-errors
Sometimes it can be useful to simulate a problem in your database by simulating an ORA-error. After we had a nasty bug with Grid Control (GC suddenly wasn’t able to monitor the alertlog of 10.2.0.5 databases anymore, see my post … Continue reading
Posted in Database
Tagged ADR, alertlog, database, dbms_system.ksdwrt, enterprise manager, grid control, LinkedIn, ORA, oracle, simulation, troubleshooting
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Calculating Compression Ratio
Before implementing one or more of the Oracle compression options that are available within an Oracle database, there are a couple of things you would like to examine before implementing one or more of these compression options. One thing you … Continue reading
Posted in Database
Tagged compress, compression, database, dbms_comp_advisor, DIRECT_LOAD, index key compression, LinkedIn, OAC, OLTP, oracle, oracle advanced compression, PLSQL
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Constraint Exceptions
When adding or enabling a constraint on a table, it is possible that an error occurs because of an constraint violation. If for example you are trying to add a unique constraint to a column (or combination of columns) of … Continue reading
Password Hashes
Within Oracle databases passwords get hashed. When, for example, you create a new account or change the password of an account, the specified clear-text password gets hashed. This hash value is stored in the database with the account. Once hashed … Continue reading