【大页内存】Oracle数据库配置大页内存

2021/8/20 2:05:40

本文主要是介绍【大页内存】Oracle数据库配置大页内存,对大家解决编程问题具有一定的参考价值,需要的程序猿们随着小编来一起学习吧!

【大页内存】Oracle数据库配置大页内存

原创 Oracle 作者:xysoul_云龙 时间:2021-08-19 10:23:42  12  0

配置大页内存

脚本内容

  1. #!/bin/bash
  2. #
  3. # hugepages_settings.sh
  4. #
  5. # Linux bash script to compute values for the
  6. # recommended HugePages/HugeTLB configuration
  7. # on Oracle Linux
  8. #
  9. # Note: This script does calculation for all shared memory
  10. # segments available when the script is run, no matter it
  11. # is an Oracle RDBMS shared memory segment or not.
  12. #
  13. # This script is provided by Doc ID 401749.1 from My Oracle Support
  14. # http://support.oracle.com
  15. # Welcome text
  16. echo "
  17. This script is provided by Doc ID 401749.1 from My Oracle Support
  18. (http://support.oracle.com) where it is intended to compute values for
  19. the recommended HugePages/HugeTLB configuration for the current shared
  20. memory segments on Oracle Linux. Before proceeding with the execution please note following:
  21. * For ASM instance, it needs to configure ASMM instead of AMM.
  22. * The 'pga_aggregate_target' is outside the SGA and
  23. you should accommodate this while calculating the overall size.
  24. * In case you changes the DB SGA size,
  25. as the new SGA will not fit in the previous HugePages configuration,
  26. it had better disable the whole HugePages,
  27. start the DB with new SGA size and run the script again.
  28. And make sure that:
  29. * Oracle Database instance(s) are up and running
  30. * Oracle Database 11g Automatic Memory Management (AMM) is not setup
  31. (See Doc ID 749851.1)
  32. * The shared memory segments can be listed by command:
  33. # ipcs -m
  34. Press Enter to proceed..."
  35. read
  36. # Check for the kernel version
  37. KERN=`uname -r | awk -F. '{ printf("%d.%d\n",$1,$2); }'`
  38. # Find out the HugePage size
  39. HPG_SZ=`grep Hugepagesize /proc/meminfo | awk '{print $2}'`
  40. if [ -z "$HPG_SZ" ];then
  41. echo "The hugepages may not be supported in the system where the script is being executed."
  42. exit 1
  43. fi
  44. # Initialize the counter
  45. NUM_PG=0
  46. # Cumulative number of pages required to handle the running shared memory segments
  47. for SEG_BYTES in `ipcs -m | cut -c44-300 | awk '{print $1}' | grep "[0-9][0-9]*"`
  48. do
  49. MIN_PG=`echo "$SEG_BYTES/($HPG_SZ*1024)" | bc -q`
  50. if [ $MIN_PG -gt 0 ]; then
  51. NUM_PG=`echo "$NUM_PG+$MIN_PG+1" | bc -q`
  52. fi
  53. done
  54. RES_BYTES=`echo "$NUM_PG * $HPG_SZ * 1024" | bc -q`
  55. # An SGA less than 100MB does not make sense
  56. # Bail out if that is the case
  57. if [ $RES_BYTES -lt 100000000 ]; then
  58. echo "***********"
  59. echo "** ERROR **"
  60. echo "***********"
  61. echo "Sorry! There are not enough total of shared memory segments allocated for
  62. HugePages configuration. HugePages can only be used for shared memory segments
  63. that you can list by command:
  64. # ipcs -m
  65. of a size that can match an Oracle Database SGA. Please make sure that:
  66. * Oracle Database instance is up and running
  67. * Oracle Database 11g Automatic Memory Management (AMM) is not configured"
  68. exit 1
  69. fi
  70. # Finish with results
  71. case $KERN in
  72. '2.4') HUGETLB_POOL=`echo "$NUM_PG*$HPG_SZ/1024" | bc -q`;
  73. echo "Recommended setting: vm.hugetlb_pool = $HUGETLB_POOL" ;;
  74. '2.6') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
  75. '3.8') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
  76. '3.10') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
  77. '4.1') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
  78. '4.14') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
  79. '4.18') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
  80. '5.4') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
  81. *) echo "Kernel version $KERN is not supported by this script (yet). Exiting." ;;
  82. esac
  83. # End

开始配置

  1. #运行,数据库开启状态
  2. chmod +x hugepages_settings.sh
  3. ./hugepages_settings.sh
  4. # /etc/security/limits.conf 配置
  5. * soft memlock 60397977
  6. * hard memlock 60397977
  7. #/etc/sysctl.conf 配置,eg
  8. vm.nr_hugepages = 1496
  9. sysctl -p
  10. grep Huge /proc/meminfo
  11. #重启数据库

当然也可以使用参数来锁定数据库使用的内存,以防止其他程序使用。如数据库参数use_large_pages。
系统参数vm.hugetlb_shm_group 。如调整该参数,请反复确认



这篇关于【大页内存】Oracle数据库配置大页内存的文章就介绍到这儿,希望我们推荐的文章对大家有所帮助,也希望大家多多支持为之网!


扫一扫关注最新编程教程