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3 этап - запуск OracleDB 12c для CarabiDB

listener.ora

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 0.0.0.0)(PORT = 1521))
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
    )
  )

Настройка автозапуска

Выполнить из под ROOT

Замена :N на :Y в oratab:

sed -i 's/\/oracle\/12c:N/\/oracle\/12c:Y/g' /etc/oratab

Добавить сервис в systemd:

cat << EOT >> /etc/systemd/system/oracle-db.service
[Unit]
Description=Oracle Database(s) and Listener
Requires=network.target
[Service]
Type=forking  
RemainAfterExit=yes  
Restart=no  
KillMode=none  
TimeoutStopSec=10min  
User=oracle  
Group=oinstall  
# memlock limit is needed for SGA to use HugePages  
LimitMEMLOCK=infinity  
LimitNOFILE=65535  
# Please use absolute path here  
# First argument of dbstart is used to bring up Listener  
ExecStart=/home/oracle/oracle/12c/bin/dbstart /home/oracle/oracle/12c &
ExecStop=/home/oracle/oracle/12c/bin/dbshut /home/oracle/oracle/12c
[Install]
WantedBy=multi-user.target
EOT

Включить автозапуск и перезагрузиться:

chown -R oracle /home/oracle
systemctl enable oracle-db
reboot

проверка подключения

cat /home/oracle/oracle/12c/network/admin/tnsnames.ora

Для подкл. CSP потребуется строка из этого файла, напр:

  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = CarabiDB)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = CarabiDB)
    )
  )

Поменять PASSWORD

Запустить sqlplus /nolog

SQL> CONNECT SYSTEM/syspassw0rd@CarabiDB
Connected.
SQL> SELECT * FROM HELP;
------

Huge Pages

# Проверить доступные HugePages
grep HugePages /proc/meminfo
# Проверить размер страниц
grep Hugepagesize /proc/meminfo

Выключить transparent hugepages

проверить

cat /sys/kernel/mm/transparent_hugepage/enabled
# Если always madvise [never] то все в порядке

Сервис для отключения transparent hugepages

cat > /etc/systemd/system/disable-thp.service << EOF
[Unit]
Description=Disable Transparent Huge Pages
Before=sysinit.target
DefaultDependencies=no
[Service]
Type=oneshot
RemainAfterExit=yes
ExecStart=/bin/sh -c "echo 'never' > /sys/kernel/mm/transparent_hugepage/enabled && echo 'never' > /sys/kernel/mm/transparent_hugepage/defrag"
[Install]
WantedBy=sysinit.target
EOF
#Автозапуск
systemctl daemon-reload
systemctl enable disable-thp
systemctl start disable-thp

Затем - еще раз проверьте

Автоматический расчет

# Создать скрипт расчета
cat > /tmp/hugepages_settings.sh << 'EOF'
#!/bin/bash
#
# hugepages_settings.sh
#
# Linux bash script to compute values for the
# recommended HugePages/HugeTLB configuration
#
# Note: This script does calculation for all shared memory
# segments available when the script is run, no matter it
# is an Oracle RDBMS shared memory segment or not.
#
# This script is provided by Doc ID 401749.1 from My Oracle Support
# http://support.oracle.com

# Welcome text
echo "
This script is provided by Doc ID 401749.1 from My Oracle Support
(http://support.oracle.com) where it is intended to compute values for
the recommended HugePages/HugeTLB configuration for the current shared
memory segments. Before proceeding with the execution, note following:
 * For ASM instance, it needs to configure ASMM instead of AMM.
 * The 'pga_aggregate_target' is outside the SGA and
   you should accommodate this while calculating the overall size.
 * In case you changes the DB SGA size,
   as the new SGA will not fit in the previous HugePages configuration,
   it had better disable the whole HugePages,
   start the DB with new SGA size and run the script again.
And make sure that:
 * Oracle Database instance(s) are up and running
 * Oracle Database 11g Automatic Memory Management (AMM) is not setup
   (See Doc ID 749851.1)
 * The shared memory segments can be listed by command:
     # ipcs -m

Press Enter to proceed..."

read

# Check for the kernel version
KERN=`uname -r | awk -F. '{ printf("%d.%d\n",$1,$2); }'`

# Find out the HugePages size
HPG_SZ=`grep Hugepagesize /proc/meminfo | awk '{print $2}'`
if [ -z "$HPG_SZ" ];then
    echo "The hugepages may not be supported in the system where the script is being executed."
    exit 1
fi

# Initialize the counter
NUM_PG=0

# Cumulative number of pages required to handle the running shared memory segments
for SEG_BYTES in `ipcs -m | cut -c44-300 | awk '{print $1}' | grep "[0-9][0-9]*"`
do
    MIN_PG=`echo "$SEG_BYTES/($HPG_SZ*1024)" | bc -q`
    if [ $MIN_PG -gt 0 ]; then
        NUM_PG=`echo "$NUM_PG+$MIN_PG+1" | bc -q`
    fi
done

RES_BYTES=`echo "$NUM_PG * $HPG_SZ * 1024" | bc -q`

# An SGA less than 100MB does not make sense
if [ $RES_BYTES -lt 100000000 ]; then
    echo "***********"
    echo "** ERROR **"
    echo "***********"
    echo "Sorry! There are not enough total of shared memory segments allocated for
HugePages configuration. HugePages can only be used for shared memory segments
that you can list by command:

    # ipcs -m

of a size that can match an Oracle Database SGA. Please make sure that:
 * Oracle Database instance is up and running
 * Oracle Database 11g Automatic Memory Management (AMM) is not configured"
    exit 1
fi

# Finish with results
case $KERN in
    '2.4') HUGETLB_POOL=`echo "$NUM_PG*$HPG_SZ/1024" | bc -q`;
           echo "Recommended setting: vm.hugetlb_pool = $HUGETLB_POOL" ;;
    '2.6') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
    '3.8') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
    '3.10') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
    '4.1') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
    '4.14') echo "Recommended setting: vm.nr_hugepages = $NUM_PG" ;;
    *) echo "Kernel version $KERN is not supported by this script (yet). Exiting." ;;
esac

# End
EOF

chmod +x /tmp/hugepages_settings.sh

Отключение AMM (Automatic Memory Management)

-- Проверить текущие настройки
SHOW PARAMETER memory_target;
SHOW PARAMETER memory_max_target;
SHOW PARAMETER sga_target;
SHOW PARAMETER pga_aggregate_target;

-- Отключить AMM (установить в 0)
ALTER SYSTEM SET memory_target = 0 SCOPE = BOTH;
ALTER SYSTEM SET memory_max_target = 0 SCOPE = SPFILE;

-- Установить SGA и PGA
ALTER SYSTEM SET sga_target = 8G SCOPE = BOTH;
ALTER SYSTEM SET pga_aggregate_target = 2G SCOPE = BOTH;

Настройка параметров ядра

# 
Редактировать конфигурационный файл
mcedit /etc/sysctl.d/90-oracle.conf


# Добавить или изменить следующие параметры:
vm.nr_hugepages = 4126
vm.hugetlb_shm_group = oinstall  # GID группы oracle
# Добавить параметр в /etc/sysctl.conf для уменьшения блокировки памяти
vm.min_free_kbytes = 1048576
#


Применить изменения:
sysctl -p

Настройка ограничений памяти для пользователя oracle

# 
Редактировать файл лимитов mcedit /etc/security/limits.d/90-oracle.conf


# Добавить строки:
oracle soft memlock unlimited
oracle hard memlock unlimited



Проверка после перезагрузки


# Проверить HugePages
grep HugePages /proc/meminfo
# Ожидаемый результат:
# HugePages_Total:    4126
# HugePages_Free:     4096  (после запуска БД часть будет использована)
# HugePages_Rsvd:     XXXX
# HugePages_Surp:     0

# Проверить использование HugePages Oracle
cat /proc/meminfo | grep -i huge

# Проверить в Oracle
sqlplus / as sysdba
SQL> show parameter use_large_pages;



Настройка параметра Oracle USE_LARGE_PAGES


# В spfile добавить параметр
ALTER SYSTEM SET use_large_pages = ONLY SCOPE = SPFILE;



Возможные значения:
TRUE - использовать если доступны (по умолчанию)
FALSE - не использовать
ONLY - использовать только HugePages (выдаст ошибку если недостаточно)
AUTO - автоматическое управление


Мониторинг использования HugePages


# Скрипт для мониторинга
cat > /tmp/check_hugepages.sh << 'EOF'
#!/bin/bash
echo "=== HugePages Status ==="
grep -E "HugePages_Total|HugePages_Free|HugePages_Rsvd" /proc/meminfo

echo -e "\n=== Oracle Processes using HugePages ==="
ipcs -m | awk '{print $2}' | xargs -I {} grep -l {} /proc/*/maps 2>/dev/null | cut -d/ -f3 | sort -u | xargs -I {} ps -p {} -o pid,user,cmd | grep -v PID

echo -e "\n=== Total HugePages used by Oracle ==="
for PID in `pgrep -u oracle`; do
    if [ -f /proc/$PID/smaps ]; then
        grep -B11 -A8 'KernelPageSize: 2048 kB' /proc/$PID/smaps | grep -E "^Size:|^Rss:" | awk '{if(NR%2) size+=$2; else rss+=$2} END{print "PID: " $PID " Size: " size " kB, RSS: " rss " kB"}'
    fi
done 2>/dev/null
EOF

chmod +x /tmp/check_hugepages.sh
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