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Lutz Haake | Freelance Oracle Consultant

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  • How to clean up stuck datapump jobs

    https://anargodjaev.wordpress.com/2013/12/17/how-to-cleanup-orphaned-datapump-jobs-from-dba_datapump_jobs/

  • SQL*Net client trace — how to put log files in the right folder

    The customer was experi­encing off SQL*net problems, so I did a client side trace. The tracing worked just…

  • SYS.AUD$ stores ntimestamp# in UTC time, without time zone

    Use the sys_extract_utc() function to convert systi­mestamp to UTC before comparing ntimestamp#! select * from sys.aud$…

  • One of the best readings on dynamic sampling I have found so far

    http://www.google.com/patents/US20040225639

  • OMS 12c: corrupt calendar control in RAC top activity

    After patching 11.2.0.3.12, the “top activity” view in OMS12c stpped working properly. The calendar control in…

  • How to display the hints associated with a SQL patch or profile

    This is how to display the exact kind of hints included in a SQL patch or SQL…

  • How to drop database links in any schema

    Need to drop a database link in another user’s schema? This is how. define link_name='SOME_DBLINK' define link_owner='SOME_OWNER' declare…

  • Programming loops in SQL

    Using the WITH CLAUSE, loops and even nested loops can be imple­mented using plain SQL. To illus­trate…

  • How to use wait event histograms to identify possible I/O subsystem problems

    dba_hist_event_histogram holds a lot of infor­mation which can prove useful when analyzing the overall system performance. To…

  • How to create a SQL patch with forced matching

    SQL patches are used to add hints to SQL state­ments that you cannot modify directly. This…

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