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Database is not starting up with ORA-27102 after enabling hugepages (Doc ID 1990322.1)

Last updated on AUGUST 04, 2018

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.2 and later
Information in this document applies to any platform.
***Checked for relevance on 06-Aug-2016***

Symptoms


Hugespages is set as per recommended by hugepages_settings.sh in Doc ID 401749.1, also Kernel parameters "memlock" and "shmmax" are set properly. 

Follow Doc ID 361468.1 for implementing hugepages. 

Database failed to start due to following error after enabling hugepages :

SQL> startup nomount
ORA-27102: out of memory
Linux-x86_64 Error: 28: No space left on device

 

Command "free" shows enough free space, also SWAP is configured with enough size and not full.

ipcs -m  ---> Correct number of shared segments 

------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x41067c38 15269892 oracle 660 1075838976 35

df -k    ---> Correcly mounted and enough freespace
tmpfs 55G 0 55G 0% /dev/shm


The Database can be started after setting USE_LARGE_PAGES=false with same SGA size (this case - 25g), however The Database can't be started with hugepages

Changes

Enabling hugepages

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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