查看时间时区
timedatectl
设置时区
timedatectl set-timezone "Asia/Shanghai"

timedatectl set-time HH:MM:SS
timedatectl set-time "2012-10-30 18:17:16"
--将系统时间同步给硬件时间
timedatectl set-local-rtc 1

--脚本配置
cp /etc/sysctl.conf /etc/sysctl.conf.bak
echo
MemTotal=`grep MemTotal /proc/meminfo | awk '{print $2}'`
PAGE_SIZE=`getconf PAGE_SIZE`
shmmax=`expr $MemTotal \* 1024`
shmall=`expr $shmmax / $PAGE_SIZE`
cat >> /etc/sysctl.conf << EOF fs.file-max = 6815744 kernel.sem = 10000 10240000 10000 1024 kernel.shmmni = 4096 kernel.shmall = $shmall kernel.shmmax = $shmmax net.ipv4.ip_local_port_range = 9000 65500 net.core.rmem_default = 16777216 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216 net.core.wmem_default = 16777216 fs.aio-max-nr = 6194304 vm.dirty_ratio=20 vm.dirty_background_ratio=3 vm.dirty_writeback_centisecs=100 vm.dirty_expire_centisecs=500 vm.swappiness=10 vm.min_free_kbytes=524288 net.core.netdev_max_backlog = 30000 net.core.netdev_budget = 600 net.ipv4.conf.all.rp_filter = 2 net.ipv4.conf.default.rp_filter = 2 #vm.nr_hugepages =51200 EOF --启用参数 sysctl --system --大页计算 使用Oracle 提供的脚本hugepages_settings.sh的脚本来计算vm.nr_hugepages的值，这个参数值需要根据实际的大内存页面数设置，这个参数在大内存页设置一节有详细描述。注脚本跑出来的值在加10，以免SGA有额外开销用不上，用以下命令来计算内核参数。 MEM=512; SGA=256; echo "vm.nr_hugepages = `expr ${MEM} / 2 \* 1024 \* 1024 \* 1024 / 2048 / 1024 + 10; `"

yum -y install targetcli python python-configshell python-rtslib python-six bc binutils compat-libstdc compat-libcap1 gcc gcc-c++ libX11 libXau libXi libXtst libXrender libXrender-devel libxcb glibc glibc-common  glibc-devel fontconfig-devel ksh libaio libaio-devel libgcc libstdc++ libstdc++-devel make sysstat openssh-clients compat-libcap1   xorg-x11-utils xorg-x11-xauth elfutils unixODBC unixODBC-devel libXp elfutils-libelf elfutils-libelf-devel smartmontools

yum install -y /soft/*.rpm

yum -y install /lib64/libnsl.so.1 

$ORACLE_HOME/install/response/db_install.rsp

oracle.install.responseFileVersion=/oracle/install/rspfmt_dbinstall_response_schema_v19.0.0
oracle.install.option=INSTALL_DB_SWONLY
UNIX_GROUP_NAME=oinstall
INVENTORY_LOCATION=/u01/app/oraInventory
ORACLE_HOME=/u01/app/oracle/product/19.3/dbhome_1
ORACLE_BASE=/u01/app/oracle
oracle.install.db.InstallEdition=EE
oracle.install.db.OSDBA_GROUP=dba
oracle.install.db.OSOPER_GROUP=oper
oracle.install.db.OSBACKUPDBA_GROUP=backupdba
oracle.install.db.OSDGDBA_GROUP=dgdba
oracle.install.db.OSKMDBA_GROUP=kmdba
oracle.install.db.OSRACDBA_GROUP=racdba
oracle.install.db.rootconfig.executeRootScript=false

--设置兼容性, 解决[INS-08101] Unexpected error while executing the action at state: 'supportedOSCheck'
export CV_ASSUME_DISTID=RHEL7.6

cd $ORACLE_HOME
--安装前检查
./runInstaller -executePrereqs -silent -responseFile /u01/app/oracle/product/19.3/dbhome_1/install/response/db_install.rsp
--安装DB软件
./runInstaller -silent -responseFile /u01/app/oracle/product/19.3/dbhome_1/install/response/db_install.rsp -skipPrereqs

--执行root.sh脚本
[root@ora19c ~]# /u01/app/oraInventory/orainstRoot.sh
Changing permissions of /u01/app/oraInventory.
Adding read,write permissions for group.
Removing read,write,execute permissions for world.

Changing groupname of /u01/app/oraInventory to oinstall.
The execution of the script is complete.
[root@ora19c ~]# /u01/app/oracle/product/19.3/dbhome_1/root.sh
Performing root user operation.

The following environment variables are set as:
    ORACLE_OWNER= oracle
    ORACLE_HOME=  /u01/app/oracle/product/19.3/dbhome_1

Enter the full pathname of the local bin directory: [/usr/local/bin]: 
The contents of "dbhome" have not changed. No need to overwrite.
The contents of "oraenv" have not changed. No need to overwrite.
The contents of "coraenv" have not changed. No need to overwrite.


Creating /etc/oratab file...
Entries will be added to the /etc/oratab file as needed by
Database Configuration Assistant when a database is created
Finished running generic part of root script.
Now product-specific root actions will be performed.
Oracle Trace File Analyzer (TFA - Standalone Mode) is available at :
    /u01/app/oracle/product/19.3/dbhome_1/bin/tfactl

Note :
1. tfactl will use TFA Service if that service is running and user has been granted access
2. tfactl will configure TFA Standalone Mode only if user has no access to TFA Service or TFA is not installed

Please apply the one-off patch for BUG 30827849 via https://updates.oracle.com/download/30827849.html.
Or you can apply DB RU19.12 and later.
Or you can use below workaround to run dbca.
COMMAND: dbca -J-Djava.io.tmpdir=
E.g: ./dbca -J-Djava.io.tmpdir=/home/oracle/tmp

[root@oracle19c03 ~]# cat /proc/swaps
Filename                                Type            Size    Used    Priority
/dev/nvme0n1p2                          partition       2145276 668672  -2
/root/swapfile                          file            499996  0       -3
[root@oracle19c03 ~]# free -m
              total        used        free      shared  buff/cache   available
Mem:           2814         623         700           0        1489         720
Swap:          2583         653        1930