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UPDATE detalles internos...y sus efectos secundarios

A primera vista, puede parecer que hablar de UPDATE sea trivial, sin embargo en algunos casos puede ser la causa de severos problemas de performance, tareas de mantenimiento innecesarias y/o desperdicio de storage.

Visor de traces 10053 Cost Based Optimizer

Jonathan Lewis nos comparte este practico visor de traces, cuya autoria original corresponde a Hans-Peter Sloot de Atos Origin y Robert van der Ende, quienes
escribieron esta herramienta para facilitar la revisión de los archivos trace generados con el evento 10053, que pueden llegar a ser enormes. Recorrer el contenido
de arriba a abajo para referenciar las zonas de interes puede ser extremadamente tedioso. Su interface de navegacion tipo "arbol" permite visualizar los encabezados
importantes y expandir al detalle el(los) que te interese(n).

Example: ROW CACHE LOCK ...

Investigate ROW CACHE LOCK when we found High "row cache lock' wait
http://it.toolbox.com/blogs/surachart/row-cache-lock-35256

Etc:
Oracle DUPLICATE Without Connection to Target Database (11gR2)
http://surachartopun.com/2009/11/duplicate-without-connection-to-target....

Surachart Opun
http://surachartopun.com

Example; Moving database file in ASM diskgroup

I wrote about moving datafile in ASM

Moving database file from one ASM diskgroup to another
http://it.toolbox.com/blogs/surachart/moving-database-file-from-one-asm-...

MOVING DATAFILE IN ASM BY ASMCMD(cp)
http://it.toolbox.com/blogs/surachart/moving-datafile-in-asm-by-asmcmdcp...

By Surachart
http://surachartopun.com

10gRAC with Solaris (IPMP)

On Solaris, IP network multipathing (IPMP) provides physical interface failure detection and transparent network access failover for a system with multiple interfaces on the same IP link.

On 10gRAC, It's a good question, How to Setup 10gRAC with Solaris (IPMP) ?

Any Idea About "INITRANS"

What is "INITRANS"?
Specify the initial number of concurrent transaction entries allocated within each data block allocated to the database object. This value can range from 1 to 255 and defaults to 1, with the following exceptions: (on10g MAX_TRANS 's ignored )



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