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How to Troubleshooting Bad Execution Plans
Very good sql tuning artical from Greg Rahn Original Link: One of the most common performance issues DBAs encounter are bad execution plans. Many try to resolve bad executions plans by setting...
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Why Isn’t Oracle Using My Index?!
By Jonathan Lewis http://www.dbazine.com/oracle/or-articles/jlewis12 The question in the title of this piece is probably the single most frequently occurring question that appears in the Metalink...
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Can’t compile a stored procedure when it’s locked
Trying to recompile a procedure causes the application to hang (ie: SQL*Plus hangs after submitting the statement). Eventually ORA-4021 errors occur after the timeout (usually 5 minutes). Here is the...
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Sth. about checkpoint
reading a article about checkpoint on metalink(Checkpoint Tuning and Troubleshooting Guide [ID 147468.1]) Here are some good points for checkpoint: Oracle writes the dirty buffers to disk only on...
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Oracle 10g ASM/RAW storage migration
Objective: we want to migrate the whole shared storage from old SAN to new SAN without re-installing the whole Oracle RAC Scenario: 1.Current structure [Nodes] ## eth1-Public 10.0.0.101 vmrac01...
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how to deinstall the failed 11gR2 grid infrastructure
Two parts are involved: first deconfigure, then deinstall Deconfigure and Reconfigure of Grid Infrastructure Cluster: Identify cause of root.sh failure by reviewing logs in...
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root.sh failed on 2nd node when installing Grid Infrastructure
when i was running root.sh for the last step of grid infra installation on second node, it failed (it was success on 1st node): root.sh failed on second node with following errors ——————————————————-...
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Recreating spfile on ASM storage from pfile
Sometimes when you strewed up with parameters, you need to use the pfile as stepstone to undo the changes in spfile. How does it happen if your spfile sits on ASM storage? Here is an workaround. 1. try...
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Use RMAN to restore/recover the database to remote host
0. background The purpose for this testing is to try restore/recover the database to remote host with rman backup i am using 1 vmware linux box, single ORCL oracle instance on ASM storage (to make...
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Set Oracle SGA > 256GB
I had a installation request for installing Oracle 11gR2 on a 2TB memory server. The installation failed on DBCA with complains about can’t reach shared memory. Check the metalink didn’t find any...
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