Truncate Takes A Long Time -- Waits on RO enqueue [metalink ID 286363.1]
1. For 10g slow truncate issues, switch off the new feature and revert to 9i functionality model:
ALTER SYSTEM SET "_db_fast_obj_truncate"=FALSE SCOPE=BOTH;
or change the initora/pfile as appropriate.
2. If the performance is to be improved in 9i, try improving the throughput of DBWR.
Setting db_writer_processes can help.
Rownum quiz
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Here’s a silly little puzzle that baffled me for a few moments until I
spotted my typing error. It starts with a small table I’d created to hold a
few rows...
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