On Oracle

Wednesday, November 27, 2013

Remove Stale Native Code Files on AIX

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3 days after posting Blog: PGA,     SGA space usage watching from UNIX about ipcs command for Oracle SGA, there was a problem reported on ...
Tuesday, November 19, 2013

PGA, SGA memory usage watching from UNIX

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In the last two Blogs, we talked about how to measure PL/SQL package PGA memory usage and investigate ORA-04030 errors in incident file and ...
Tuesday, November 5, 2013

ORA-04030 incident file and alert.log

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In the last two Blogs, we talked about how to measure PL/SQL package PGA memory usage and different ways to reclaim unused memory:       db...
Monday, September 16, 2013

Execution Switching between "direct path read" and "db file scattered read"

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Oracle’s locking principle: blocking is only eligible among writers. Reader never blocks writer, and writer never blocks reader.     What ...
Thursday, June 27, 2013

Oracle PL/SQL Collection Memory Reclaim

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Oracle PL/SQL collection includes associative array, nested table and varray array, which are often used to store large amount of data. Cons...
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