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POInfluence of forking on existing mysql-connection
 

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  1. POInfluence of forking on existing mysql-connection
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    <p>I have a server which is/should be able to handle a lot of connections at the same time. Now sometimes I have an error: “Lost connection to MySQL server during query”. At the time I am fixing this with </p> <pre><code>def mysql_handling(string): global cursor tries=0 while True: if tries&lt;5: try: cursor.execute(string) if 'SELECT' not in string: db.commit() break except MySQLdb.Error, e: print("Error %d: %s" %(e.args[0], e.args[1])) cursor.close() time.sleep(0.1) cursor = get_cursor() #setting up a new mysql connection #mysql_error_tracking(string) tries+=1 else: sys.exit(1) </code></pre> <p>So now I am able to handle a lot of connections at the same time, but at the times that I have this error (Lost conn.) I want to know at which query this happens, and if there is somekind of pattern in this. So to track this, I also want to store this in the mysql-database with a script somewhat like this:</p> <pre><code>def mysql_error_tracking(string): #Clone/fork try: error_serv = os.fork() except: print "error_FORK failed!" if error_serv: print 'there is a MYSQL-ERROR, SAVE!!!' cursor.execute("SELECT count FROM query_errors WHERE string= "+"'"+str(string)+"'") data=cursor.fetchone() print data if data is None: cursor.execute("INSERT INTO query_errors (string) VALUES ("+"'"+str(string)+"')") db.commit() print 'insert in queries' else: cursor.execute("UPDATE query_errors SET count=count+1 WHERE string= "+"'"+str(string)+"'") db.commit() print 'count ploes 1' sys.exit(0) </code></pre> <p>This does work, but <strong>forking</strong> the connection seems to really pressurize the already existing mysql-connection, is it better to just not-fork instead? </p>
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    1. USLazykiddy
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    1. COI would suggest not to log db errors into db :) Better to log it to some local file, via syslog or webserver's error log.
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      1. USMarki555
    2. CO@Marki555 I will probably do this. Thank you
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      1. USLazykiddy
 

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