News By Tag
* Database Health Checkup
* Database Services
* ISM DISM
* Solaris oracle
* Remote Dba Services
* More Tags...
News By Location
ISM and DISM Feature on Solaris for Oracle Server Tuning
Performance Tuning of Oracle Server on Solaris using ISM and DISM features and Oracle features for Memory sizing
Solaris operating systems, Oracle instance utilizes ISM feature. ISM called as Intimate Shared Memory in Solaris. ISM was introduced in Solaris for performance enhancement of application and server tuning. If Oracle instance creates SGA in ISM then System Global Area automatically locked in shared memory segment. Therefore, performance is boosting up the Oracle SGA and database.
New feature of Oracle was introduced to resizing SGA on demand and without bouncing database. If Oracle SGA is using ISM and it locked in shared memory segment then there is no scope to resize such memory pages as well as expanding memory parameter without bouncing database. Hence, there is another feature is also available called Dynamic Intimate Shared Memory in Solaris. This DISM feature enables memory resizing of SGA.
ISM and DISM both features are available in Solaris 10 for server tuning and performance enhancement of Oracle server. Oracle memory new feature called SGA_TARGET and MEMORY_TARGET uses DISM. Oracle Database can abandon memory from one dynamic SGA element and allocate it to another element. Using DISM, Oracle can dynamically allocating and de-allocating memory to every part of SGA like Buffer cache, Shared Pool, Large Pool etc.
For ISM and DISM memory allocation to Oracle SGA there are certain limitations. If Oracle SGA uses ISM then Solaris system allocates implicit lock on shared memory and if Oracle SGA uses DISM then Solaris system doesn’t allocate implicit locking shared memory. Reason behind this scenario is dynamic resizing of memory pages in Unix pages. Therefore, Solaris server uses explicit locking whenever DISM is used by Oracle SGA. This explicit locking mechanism facilitates dynamic memory pages expanding and decreasing feature. ISM and DISM both features support VLM very Large Memory pages on 64 bit Solaris systems.
Expert team of Dbametrix offers database health check seminar absolutely free of cost and without access of server. Dbametrix team provides "smart computing" concept for Oracle server tuning. Optimize database and application for taking maximum performance from existing server architecture and hardware capacity.
Expert remote DBA team of Dbametrix provides database services, remote monitoring, remote dba services and remote dba support for large critical Oracle databases with High Availability and guaranteed response time SLA. For more information kindly contact:
Contact Person: Rajesh Dave
Address: Skokie, IL, USA
# # #
Expert remote Oracle DBA team offers remote dba support,remote dba services,remote dba work,remote database monitoring,database services,outsourcing with very low cost plan using SLA.