Skip to main content

ABOUT HUGE PAGES FOR ORACLE ADMINS

HUGE PAGES:

 
Overview of HugePages
 

## HugePages is a feature integrated into the Linux kernel 2.6. Enabling HugePages makes it possible for the operating system to support memory pages greater than the default (usually 4 KB).

## Using very large page sizes can improve system performance by reducing the number of system resources required to access page table entries.

## Huge Pages is useful for both 32-bit and 64-bit configurations.

## Huge Page sizes vary from 2 MB to 256 MB, depending on the kernel version and the hardware architecture.


## For Oracle Databases, using Huge Pages reduces the operating system maintenance of page states, and increases Translation Lookaside Buffer (TLB) hit ratio.

 
the command to get Hugepagesize from os prompt

1) grep Hugepagesize /proc/meminfo

Hugepagesize:       2048 kB


2) grep Huge /proc/meminfo

AnonHugePages:         0 kB

HugePages_Total:   14016

HugePages_Free:     6639

HugePages_Rsvd:     6613

HugePages_Surp:        0

Hugepagesize:       2048 kB

Transparent HugePages memory differs from standard HugePages memory because the kernel khugepaged thread allocates memory dynamically during runtime. Standard HugePages memory is pre-allocated at startup, and does not change during runtime.
Labels:

Comments

Post a Comment

Popular posts from this blog

Issues and Solutions for Oracle 19c Grid Infrastructure Installation

     Common Issues and Solutions for Oracle 19c Grid Infrastructure Installation •       Check Log Files for Details Oracle installation issues often provide valuable clues in the log files. If the installer seems stuck or fails, check the following logs: ▪ Install log : /u01/app/oraInventory/logs/installActions<date>.log •       ▪ Grid Infrastructure log : $ORACLE_BASE/cfgtoollogs/ •         •       These logs can provide error messages and help identify the exact issue. •         •        Check Permissions and Ownership Verify that the Oracle Grid Infrastructure installation directories have the correct ownership and permissions. •        For example: •        Make sure the grid user has permission to write to the directories where the i...
Post a Comment
Read more

CHANGING DBID FOR ORACLE DATABASE 11G

C:\Users\computer>sqlplus SQL*Plus: Release 11.1.0.7.0 - Production on Thu Sep 10 21:03:33 2013 Copyright (c) 1982, 2008, Oracle.  All rights reserved. Enter user-name: sys as sysdba Enter password: Connected to: Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options SQL> select dbid from v$database;       DBID ---------- 2188161033 SQL> exit Disconnected from Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options C:\Users\computer>nid DBNEWID: Release 11.1.0.7.0 - Production on Thu Sep 10 21:04:44 2013 Copyright (c) 1982, 2007, Oracle.  All rights reserved. Keyword     Description                    (Default) ---------------------------------------------------- TARGET ...
Post a Comment
Read more

How to Improve Oracle Data Pump Performance - IMPDP

  How to Improve Oracle Data Pump Performance:- Use Parallelism : Set the PARALLEL parameter to at least 2 * number of CPUs . This allows multiple worker processes to perform tasks simultaneously, speeding up both export and import processes. Example: PARALLEL=4 for a system with 2 CPUs. Perform Import Using NETWORK_LINK : Use the NETWORK_LINK parameter to import data directly from the source database. This method is particularly helpful when space is constrained, as it streams the data without needing to generate dump files on the source. It can also reduce time compared to exporting and then importing, as data is streamed directly from the source to the target database. Disable Archivelog Mode (Standalone Databases) : For standalone databases, temporarily disable archive logging during the import process. Import operations can generate a lot of redo logs, slowing down the import. Disabling...
Post a Comment
Read more