Memlock limit too small

Question

Hi,
We have Oracle 11gR2 (11.2.0.3) on the server with RHEL 5. Whenever we restart the database, we get below statements in the alert log:
Memlock limit too small: 32768 to accommodate segment size: 16777216
Memlock limit too small: 32768 to accommodate segment size: 16777216
Memlock limit too small: 32768 to accommodate segment size: 16777216
Memlock limit too small: 32768 to accommodate segment size: 16777216
Memlock limit too small: 32768 to accommodate segment size: 16777216
Memlock limit too small: 32768 to accommodate segment size: 2097152
****************** Large Pages Information *****************
Total Shared Global Region in Large Pages = 0 KB (0%)
Large Pages used by this instance: 0 (0 KB)
Large Pages unused system wide = 1536 (3072 MB) (alloc incr 16 MB)
Large Pages configured system wide = 1536 (3072 MB)
Large Page size = 2048 KB
RECOMMENDATION:
  Total Shared Global Region size is 3014 MB. For optimal performance,
  prior to the next instance restart increase the number
  of unused Large Pages by atleast 0 2048 KB Large Pages (0 KB)
  system wide to get 100% of the Shared
  Global Region allocated with Large pages
Please advise.
-Onkar

Answer 1

PaulR,
below are the entries in my /etc/security/limits.conf file:
#Each line describes a limit for a user in the form:
#<domain>        <type>  <item>  <value>
#Where:
#<domain> can be:
#        - an user name
#        - a group name, with @group syntax
#        - the wildcard *, for default entry
#        - the wildcard %, can be also used with %group syntax,
#                 for maxlogin limit
#<type> can have the two values:
#        - "soft" for enforcing the soft limits
#        - "hard" for enforcing hard limits
#<item> can be one of the following:
#        - core - limits the core file size (KB)
#        - data - max data size (KB)
#        - fsize - maximum filesize (KB)
#        - memlock - max locked-in-memory address space (KB)
#        - nofile - max number of open files
#        - rss - max resident set size (KB)
#        - stack - max stack size (KB)
#        - cpu - max CPU time (MIN)
#        - nproc - max number of processes
#        - as - address space limit
#        - maxlogins - max number of logins for this user
#        - maxsyslogins - max number of logins on the system
#        - priority - the priority to run user process with
#        - locks - max number of file locks the user can hold
#        - sigpending - max number of pending signals
#        - msgqueue - max memory used by POSIX message queues (bytes)
#        - nice - max nice priority allowed to raise to
#        - rtprio - max realtime priority
#<domain>      <type>  <item>         <value>
#*               soft    core            0
#*               hard    rss             10000
#@student        hard    nproc           20
#@faculty        soft    nproc           20
#@faculty        hard    nproc           50
#ftp             hard    nproc           0
#@student        -       maxlogins       4
# End of file
oracle          soft    nproc   16384
oracle          hard    nproc   32768
oracle          soft    nofile  65536
oracle          hard    nofile  98304
oracle          soft    stack   32768
oracle          hard    stack   49152
Any suggestions??
-Onkar