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UNIX for Beginners Questions & Answers
Control not returning to UNIX when sqlplus is executed in while loop of shell script
Post 303045806 by jim mcnamara on Monday 13th of April 2020 09:20:07 PM
04-13-2020
You need code tags, your post is hard to read 
Start with only the sql, run it from the sqlplus prompt.
Next wrap JUST the sql that ran above in a shell wrapper. Execute it. Use the parameter associated with the problem.
One thing I've seen that causes hangs is the sqlplus gets what it thinks is garbage, usually caused by trying to quote or escape something so the shell will not wreck it, and passing it through the shell script to sqlplus. sqlpus hangs because it is waiting for more input, like to complete the quote for example.
As a first guess consider this is your problem, especially since it is intermittent. Intermittent == parameter problems
It a is a wait on stdin for sqlplus, I believe.
Start with only the sql, run it from the sqlplus prompt.
Next wrap JUST the sql that ran above in a shell wrapper. Execute it. Use the parameter associated with the problem.
One thing I've seen that causes hangs is the sqlplus gets what it thinks is garbage, usually caused by trying to quote or escape something so the shell will not wreck it, and passing it through the shell script to sqlplus. sqlpus hangs because it is waiting for more input, like to complete the quote for example.
As a first guess consider this is your problem, especially since it is intermittent. Intermittent == parameter problems
It a is a wait on stdin for sqlplus, I believe.
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LEARN ABOUT REDHAT
script
SCRIPT(1) BSD General Commands Manual SCRIPT(1) NAME
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