Tip

Run multiple sessions of DBV

Ever had to do a lot of DBVERIFY commands? You build a script, or multiple scripts, and when they start running you wish you had more or less of them? Here's a UNIX script that will run a dynamically variable number of concurrent dbv commands.

#!/usr/bin/ksh
#
# *************************************************************************
# *                                                                       *
# * Name    : run_dbv.sh                                                  *
# * Author  : M. Vergara                                                  *
# * Date    : 29-Sep-2003                                                 *
# * Purpose : This script is designed to perform Oracle 'dbv' (dbverify)  *
# *           commands against a list of files from a database.           *
# *                                                                       *
# * Change Log:                                                           *
# * Chg#   Date          Description                                      *
# * ----   -----------   ---------------------------------                *
# *   1    20-Sep-2003   Created                                          *
# *                                                                       *
# *************************************************************************
# * Instructions:                                                         *
# * 1) Copy this file from /usr/local/bin to a temporary working          *
# *    directory.  NEVER RUN THIS FILE FROM /usr/local/bin!               *
# * 2) Create your list of database files to be verified using whatever   *
# *    tool you are comfortable with.  'grep', 'find', 'ls' are all valid *
# *    commands to use.  Name the file "files_to_check.txt".              *
# * 3) (Optional)  Create a file called "dbvcnt.max", containing one line *
# *    with the number of concurrent dbv processes that you wish to run.  *
# *    The script builds a default file containing '4'.                   *
# * 4) (Optional)  Create a file called "dbvsleep.time", containing one   *
# *    line with the number of seconds to sleep before checking the status*
# *    of the running processes.  The script builds a default file with   *
# *    a wait time of '21'.                                               *
# * 5) Set the Oracle environment variables for the instance you are      *
# *    checking against.  This script needs to know where $ORACLE_HOME is.*
# * 6) Execute the script with ./run_dbv.sh.  The script will start with  *
# *    four concurrent sessions of dbv.  If you decide that your system   *
# *    is capable of running more than four, merely update the            *
# *    "dbvcnt.max" file with the number of processes.  It won't change   *
# *    immediately, only when it reads the next line from the list of     *
# *    database files.  You can change this number up or down.            *
# * 7) The output log files from the 'dbv' commands are kept in the local *
# *    directory.  You can look for files that fail with commands like:   *
# *        grep -i fail *.log | grep -v ': 0'                             *
# * 8) Modify as you see fit to make it work better for you.
# *    there
# *************************************************************************
# *                                                                       *
# * (c) Copyright 2003 Guidant Corporation                                *
# * No Warranty is expressed or implied.  Use at your own risk.  Works    *
# * best on HP-UX;  your mileage may vary.  Tastes great.  Less Filling.  *
# *                                                                       *
# * M. Vergara  29-Sep-2003                                               *
# *************************************************************************
#

#
# Existence Checks
if ! [ -f files_to_check.txt ] ; then
   echo 007
   echo Error!
   echo File "files_to_check.txt" is missing.  Cannot continue.
   echo 007
   exit 1
fi
#
if ! [ -f dbvcnt.max ] ; then
   echo 4 >

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dbvcnt.max fi # if ! [ -f dbvsleep.time ] ; then echo 21 > dbvsleep.time fi # # # Main typeset -i BaseProcs=`ps | wc -l` cat files_to_check.txt | while read line do echo "-----" date FileName=`echo ${line} | awk -F/ ' { print $NF } '` LogFileName=${FileName}.log typeset -i NumProcs=`ps | wc -l`-${BaseProcs} typeset -i MaxProcs=`cat dbvcnt.max` typeset -i SleepTime=`cat dbvsleep.time` # echo ${NumProcs} if [ ${NumProcs} -lt ${MaxProcs} ] ; then echo Verifying file ${FileName} ${ORACLE_HOME}/bin/dbv file=${line} blocksize=8192 logfile=${LogFileName} & > /dev/null sleep 1 else until [ ${NumProcs} -lt ${MaxProcs} ] do typeset -i SleepCtr=0 echo "Max processes at `date`" echo Sleeping c while [ ${SleepCtr} -lt ${SleepTime} ] do sleep 1 typeset -i SleepCtr=${SleepCtr}+1 echo "."c done echo " " typeset -i NumProcs=`ps | wc -l`-${BaseProcs} done echo Verifying file ${FileName} /oracle/CTV/920_64/bin/dbv file=${line} blocksize=8192 logfile=${LogFileName} & > /dev/null sleep 1 fi done # # ###EOF###

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This was first published in October 2003

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