中远公司在没加磁盘阵列前建了一个oracle实例zycw，加磁盘阵列后新建了一个实例zync。
为了节省系统资源本打算平时只启实例yznc，需要时才启动zycw。可每次系统重启后系统会自动重启实例zycw，rc.d下没有找到任何自动重启数据库的脚本，ORACL_HOME/network/admin下也没有listener.ora文件（系统自启动时listener服务时是读取何处的参数文件还未搞清楚）。
后来才找到系统通过在inittab文件中加入一行startdb:2345678:wait:/etc/rc.startdb调用/etc/rc.startdb启动oracle的。下面详细介绍一下Oracle的这种自启动方式：
1、 编辑修改 /etc/oratab文件将要启动的实例后面的字符改成Y。 文本样例：
#
# This file is used by ORACLE utilities. It is created by root.sh
# and updated by the Database Configuration Assistant when creating
# a database.
# A colon, ':', is used as the field terminator. A new line terminates
# the entry. Lines beginning with a pound sign, '#', are comments.
#
# Entries are of the form:
# $ORACLE_SID:$ORACLE_HOME:
#
# The first and second fields are the system identifier and home
# directory of the database respectively. The third filed indicates
# to the dbstart utility that the database should , "Y", or should not,
# "N", be brought up at system boot time.
#
# Multiple entries with the same $ORACLE_SID are not allowed.
##
*:/home/oracle:N
# *:/u2/oracle/product/9.2.0.2.0:N
zycw:/u2/oracle/product/9.2.0.2.0:N
*:/u2/oracle/product/9.2.0.2.0:N
zync:/u2/oracle/product/9.2.0.2.0:Y
#
2、 配置启动文件： 在/etc下建立文件rc.startdb，脚本如下：（这里是直接调用oracle系统自带的启动脚本，也可自己编写启动脚本）
su - oracle "-c /u2/oracle/product/9.2.0.2.0/bin/dbstart"
3、 下面要把启动信息放到/etc/inittab中，加入一行 startdb:2345678:wait:/etc/rc.startdb ，文本样例：
: @(#)49 1.28.2.9 src/bos/etc/inittab/inittab, cmdoper, bos520 8/23/00 19:50:13
: IBM_PROLOG_BEGIN_TAG
: This is an automatically generated prolog.
:
: bos520 src/bos/etc/inittab/inittab 1.28.2.9
:
: Licensed Materials - Property of IBM
:
: (C) COPYRIGHT International Business Machines Corp. 1989,1993
: All Rights Reserved
:
: US Government Users Restricted Rights - Use, duplication or
: disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
:
: IBM_PROLOG_END_TAG
:
: COMPONENT_NAME: CMDOPER
:
: ORIGINS: 3, 27
:
: (C) COPYRIGHT International Business Machines Corp. 1989, 1993
: All Rights Reserved
: Licensed Materials - Property of IBM
:
: US Government Users Restricted Rights - Use, duplication or
: disclosure restricted by GSA ADP Schedule Contract with IBM Corp.
:
: Note - initdefault and sysinit should be the first and second entry.
:
init:2:initdefault:
brc::sysinit:/sbin/rc.boot 3 >/dev/console 2>&1 # Phase 3 of system boot
powerfail::powerfail:/etc/rc.powerfail 2>&1 | alog -tboot > /dev/console # Power Failure Detection
mkatmpvc:2:once:/usr/sbin/mkatmpvc >/dev/console 2>&1
atmsvcd:2:once:/usr/sbin/atmsvcd >/dev/console 2>&1
load64bit:2:wait:/etc/methods/cfg64 >/dev/console 2>&1 # Enable 64-bit execs
tunables:23456789:wait:/usr/sbin/tunrestore -R > /dev/console 2>&1 # Set tunables
rc:23456789:wait:/etc/rc 2>&1 | alog -tboot > /dev/console # Multi-User checks
fbcheck:23456789:wait:/usr/sbin/fbcheck 2>&1 | alog -tboot > /dev/console # run /etc/firstboot
srcmstr:23456789:respawn:/usr/sbin/srcmstr # System Resource Controller
rctcpip:23456789:wait:/etc/rc.tcpip > /dev/console 2>&1 # Start TCP/IP daemons
sniinst:2:wait:/var/adm/sni/sniprei > /dev/console 2>&1
rcnfs:23456789:wait:/etc/rc.nfs > /dev/console 2>&1 # Start NFS Daemons
cron:23456789:respawn:/usr/sbin/cron
piobe:2:wait:/usr/lib/lpd/pio/etc/pioinit >/dev/null 2>&1 # pb cleanup
qdaemon:23456789:wait:/usr/bin/startsrc -sqdaemon
writesrv:23456789:wait:/usr/bin/startsrc -swritesrv
uprintfd:2