drop table plan_table; @?/rdbms/admin/utlxplan.sql […]
AIX: Avoiding “ORA-27126: unable to lock shared memory segment in core”
Did you ever change lock_sga = true for an Oracle Instance on AIX 5.3, and did see ORA-27126: unable to lock shared memory segment in core IBM AIX RISC System/6000 Error: 1: Not owner in Return? Do the following: # vmo -o v_pinshm v_pinshm = 0 # vmo -o v_pinshm=1 Setting v_pinshm to 1 # […]
Oracle 11gR2 ASM / ACFS: A first benchmark (poorly)
Hi folks, since Oracle 11g Release 2 is out now, I had to test one of the most-missed ASM features: the ASM cluster file system ACFS. My Setup: Two VMware nodes with 2 CPUs and 1,5GB of RAM each Oracle Enterprise Linux 5.3 x86_64 Four virtual cluster disks from the ESX server, 10GB in size […]
Oracle 11gR2 ASM: Changed permission policy (ORA-15260)
Did you recently see the new error ‘ORA-15260: permission denied on ASM disk group’ in your ASM administration? Maybe you are still connected as SYSDBA, old habit from 10g? A quick citation from the Oracle Docs: The SYSOPER privilege permits the following subset of the ALTER DISKGROUP operations: diskgroup_availability, rebalance_diskgroup_clause, check_diskgroup_clause (without the REPAIR option). […]
Oracle 11g Release 2 documentation
The long-awaited 11gR2 is out, at least for Linux x86 and x86_64 now. Marketing will show you all the features, but the most important link is to the documentations: http://www.oracle.com/pls/db112/homepage Use it well! Usn […]
Oracle: Executing an OS command from PL/SQL – ICMP ping from database
Executing OS commands from SQL or PL/SQL is easy as long as you are in SQL*PLUS – just do a host command. But I must confess, that this is a really useless hint. 🙂 Much more interesting is to execute an OS command with a DBMS_SCHEDULER job, but this is not possible in every case, […]
Oracle: Tracing of another session
I simply love 10046 level 12 traces. I described session tracing based on a logon trigger quite earlier, but some situations in real DBA life need this trace event switched on for a session other than my own AND for a short peroid in time (with no need for the connected user to log out). […]
Oracle: Audit a failed logon attempt without auditing
Oracle has a disadvantage: It allows no trigger BEFORE LOGON ON DTATBASE! 🙂 For obvious reasons, this would be nonsense, but there’s a need for it! Auditing failed logon attempts, for example. Of course, there’s Oracle Auditing. But IMO, setting up an audit trail for one Email in one case looked like the overkill to […]
String concat with hierarchical query and sys_connect_by_path(): Avoid ORA-30004
In the last days, I touched hierarchical queries – it’s a strange field for a DBA, but I did need it for DBA desires: A sophisticated query on statspack. Why? Since oddly, the stats$sql_text table of statspack / perfstat DOES contain the full SQL for a statement, but fragmented over various lines. But I had […]
Oracle IMPDP: Wildcard hacking
Sometimes you want to use datapump import (impdp) for smart problems. An example is excluding (or including) a subset of objects, like tables. The usual way to do so is the EXCLUDE keyword. (Footnote: All examples in this post are written for a parameter file, so don’t forget a proper quoting for your shell if […]