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Top Forums UNIX for Beginners Questions & Answers Control not returning to UNIX when sqlplus is executed in while loop of shell script Post 303045804 by preetham30 on Monday 13th of April 2020 09:01:15 PM
Old 04-13-2020
Control not returning to UNIX when sqlplus is executed in while loop of shell script

Hi All,

I have observed some of the scripts gets stuck because sqlplus session is not completing it's session. This behavior is intermittent. I will give one of the scenario. Below is the code which executes one sql query.

   sql_Type=`echo $sql_Stmt | awk -F " " '{ printf toupper($1) }'`

   E_WLM_SQL_RESULT=`sqlplus -s /@${E_WLM_DB} <<!
      set pagesize 0 feedback off verify off heading off echo on
      whenever SQLERROR exit SQL.SQLCODE
      whenever OSERROR exit 9


   if [[ $sql_RC -eq 0 ]]; then
      str_Result=`echo $E_WLM_SQL_RESULT | grep SP2`  
      if [[ ${#str_Result} > 0 ]]; then
         sql_RC=57      # SQL Error
         export E_WLM_SQL_RESULT
      sql_Code=$sql_RC   # Store SQL.SQLCODE before overwriting
      if [[ $sql_RC -eq 9 ]]; then   # OSERROR
         case $sql_Type in 
            INSERT) sql_RC=52 ;;
            UPDATE) sql_RC=53 ;;
            SELECT) sql_RC=54 ;;
            DELETE) sql_RC=56 ;;
            *) sql_RC=57 ;;
   if [[ $sql_RC -ne 0 ]]; then
      Log "Error in executing SQL Statement: $sql_Stmt "
      Log "SQL.SQLCODE=$sql_Code"
      Log "=====================================   ORACLE ERROR DESCRIPTION  ====================================="  
      Log "$E_WLM_SQL_RESULT"
      Log "======================================================================================================="
      Log "Returning with $sql_RC"

   return $sql_RC 

below is the unix session.
pwlm 8297 8290 0 00:16 ? 00:00:03 /bin/ksh -a /opt/XWLMLL02
pwlm 29121 8297 0 00:32 ? 00:00:00 sqlplus -s

The script has run a process internally and above code part is to monitor whether the process is completed. Even though the process is completed, the script has not moved further from this point. Upon checking further, I have seen one active sqlplus session. I suspect that the sqlplus session is from the above code and it is somehow stuck in turn the script has stuck.

I have observed this similar issue 3 times till now in the past 7 days. But, it is for different scripts. The logic remains the same.

This script was working fine in our old infrastructure where there was AIX server. We have not at all faced this issue over there.

Anyone, could help me to resolve the issue?

Thanks in Advance.

Last edited by preetham30; 04-15-2020 at 10:23 AM..

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SCRIPT(1)						    BSD General Commands Manual 						 SCRIPT(1)

script -- make typescript of terminal session SYNOPSIS
script [-a] [-f] [-q] [-t] [file] DESCRIPTION
Script makes a typescript of everything printed on your terminal. It is useful for students who need a hardcopy record of an interactive session as proof of an assignment, as the typescript file can be printed out later with lpr(1). If the argument file is given, script saves all dialogue in file. If no file name is given, the typescript is saved in the file typescript. Options: -a Append the output to file or typescript, retaining the prior contents. -f Flush output after each write. This is nice for telecooperation: One person does `mkfifo foo; script -f foo' and another can super- vise real-time what is being done using `cat foo'. -q Be quiet. -t Output timeing data to standard error. This data contains two fields, separated by a space. The first field indicates how much time elapsed since the previous output. The second field indicates how many characters were output this time. This information can be used to replay typescripts with realistic typing and output delays. The script ends when the forked shell exits (a control-D to exit the Bourne shell (sh(1)), and exit, logout or control-d (if ignoreeof is not set) for the C-shell, csh(1)). Certain interactive commands, such as vi(1), create garbage in the typescript file. Script works best with commands that do not manipulate the screen, the results are meant to emulate a hardcopy terminal. ENVIRONMENT
The following environment variable is utilized by script: SHELL If the variable SHELL exists, the shell forked by script will be that shell. If SHELL is not set, the Bourne shell is assumed. (Most shells set this variable automatically). SEE ALSO
csh(1) (for the history mechanism), replay(1). HISTORY
The script command appeared in 3.0BSD. BUGS
Script places everything in the log file, including linefeeds and backspaces. This is not what the naive user expects. Linux July 30, 2000 Linux

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