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Lpxus.Msb File Read Repeatedly Causing Performance Overhead (Doc ID 1332495.1)

Last updated on APRIL 12, 2022

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.


In an Oracle Server while running insert statements into a table having an xmltype column, the file
$ORACLE_HOME/xdk/mesg/lpxus.msb is opened for each insert even if there is no error raised by the statement.

This is observed running truss/strace against the process where the insert statement is running: the output files
shows several open command for the file $ORACLE_HOME/xdk/mesg/lpxus.msb, for example
kopen("/grdbms/64bit/app/oracle/product/1120/xdk/mesg/lpxus.msb", O_RDONLY) = 14.


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