Oracle DB 11 g 2 controls prerequisites failed - Oracle Linux 6.5

Hi all

Once again stuck with questions during the installation of 11 GR 2 DB.

  1. Swap size - failed
    Details:
    Size of swap - it is a prerequisite to check if sufficient total swap space is available on the system.
    Expected value: 7.74 GB (8120228,0 KB)
    Real value: 7.7 GB (8077308,0 KB)

    My checks:
    # SH - 4.1 swapon s
    Size of the characters in filename used priority
    / dev/DM-1 partition 8077308 0-1
    SH - 4.1 # cat/proc/swaps
    Size of the characters in filename used priority
    / dev/DM-1 partition 8077308 0-1
    SH - 4.1 # cat/etc/fstab. grep swap
    / dev/map/vg_vssdbserver-lv_swap swap swap defaults 0 0

    I thought that 8 GB of swap space was enough, my system has 8gbRAM.

As a general rule, swap space is usually configured to twice the RAM if you use 8 GB or less and equal to the amount of RAM if you have 16 GB or more. If you have 64 GB of RAM, however, it is useless to have 64 GB of swap space, because the loss of performance so you never need to swap space will be very bad.

However, you probably want to configure your Oracle database to use the kernel Hugepages using EAMA instead of the AMM for optimal performance and efficient use of memory. Hugepages kernel, unlike the POSIX memory shared (/ dev/shm) used by the AMM will be pre-allocate memory to start the system upward and can not use swap space. Don't forget that the swap space is not a substitute for the lack of physical memory (RAM).

On the Oracle database installation, there should be a button to ignore warnings or errors and continue the installation or if you feel more comfortable with it, to meet this control, simply create a temporary swap file to increase your swap space, which later can be removed when you no longer need. It is certainly much easier than to the resize your swap partition.

For example:

[root@vm213 ~] # lsb_release d

Description: Oracle Linux Server version 6.5

[root@vm213 ~] # swapon s

Size of the characters in filename used priority

/ dev/DM-1 partition 2097148 0-1

Create a pagefile of 1 GB in / Home

[root@vm213 ~] # dd if = \u003d/dev/zero of / home/swapfile bs = 1024 count = 1048576

1048576 + 0 records in

1048576 + 0 records out

1073741824 bytes (1.1 GB) copied, 4.32366 s, 248 MB/s

[root@vm213 ~] # chmod 600/home/swapfile

[root@vm213 ~] # ls-l/home/swapfile

-rw-------. 1 root root 1073741824 28 May 03:07 / home/swapfile

[root@vm213 ~] # home/mkswap/swapfile

mkswap: / home/swapfile: caution: do not erase the sectors bootbits

all over the disk. Use f to force.

Implementation of version 1 of swapspace, size = 1048572 KiB

no label, UUID = d26f4d5f-af46-4567-b836-0d5d0b1661cb

[root@vm213 ~] # home/swapon/swapfile

[root@vm213 ~] # swapon - a

[root@vm213 ~] # swapon s

Size of the characters in filename used priority

/ dev/DM-1 partition 2097148 0-1

/ home/file swapfile 1048572 0-2

If you want to enable the pagefile at system startup:

[root@vm213 ~] # cp/etc/fstab /etc/fstab.backup_'date + %N '

[root@vm213 ~] # echo "/ home/swap file, swap swap defaults 0 0' > / etc/fstab"

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    BRW - rw-. 1 root disk 8, 13, 19 Aug 01:54 / dev/sdc1

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    CRW - rw-. 1 oracle oinstall 162, 0 19 Aug 01:54 / dev/raw/raw2

    CRW - rw-. 1 oracle oinstall 162, 0 19 Aug 01:54 / dev/raw/raw3


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    2015 08-19 02:15:28.238:

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    HTH,
    Brian

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