在做oracle數據庫管理的時候，經常會有用戶遇到超過最大進程數的錯誤，表現爲新的連接無法登入數據庫。一致提示超過最大的process數 。其實這個問題，如果用戶是測試環境，好解決。直接關閉數據庫或者直接kill掉所有的“LOCAL=NO”的進程。
但是很多情況是，用戶無法接受停機，或者kill掉所有的遠端連接。基於以上情況，寫了如下腳本
#!/usr/bin/perl
#write by wulei
#get the first parameter
$arg1="";
chomp($arg1);
while($arg1 eq "")
{
print "please input your first parameter:";
$arg1=<STDIN>;
chomp($arg1);
if($arg1 ne ""){
@temp1=`ps -eo lstart,pid,args | grep '$arg1' | grep -v grep`;
$process_count=`ps -eo lstart,pid,args | grep '$arg1' | grep -v grep | wc -l`;
chomp($process_count);
if($process_count eq "0")
{
$arg1="";
print "we got 0 processes,please retry!\n";
next;
}
print "We will kill $process_count(count) processes\n";
print "All the processes list below!!!!!!!!!!!!!!!!!\n";
print "#############################################################\n";
print @temp1;
}
chomp($arg1);
}
#get the second parameter
$arg2="";
chomp($arg2);
while($arg2 eq "")
{
print "\n";
print "\n";
print "############################################################\n";
print "#[null] kill all the process we had got #\n";
print "#[num ] kill the process start at before sysdate-number #\n";
print "if you want exit,enter 'ctrl+c' #\n";
print "############################################################\n";
print "please input your second parameter:";
$arg2=<STDIN>;
chomp($arg2);
if($arg2 eq "")
{
print "Are you sure,to kill all the process above:[y/n]";
$confirm=<STDIN>;
chomp($confirm);
if($confirm eq "Y" or $confirm eq "y")
{
#kill all the process ,we got it
@result=`ps -eo pid,args | grep '$arg1' | grep -v grep`;
print "Kill List !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!\n";
print "###################################################################\n";
foreach $result (@result)
{
@result1=split(/\s+/,$result);
chomp($result1[0]);
if($result1[0] ne ""){
#`kill -9 '$result1[0]'`;
print $result1[0]." ".$result1[1]." ".$result1[2]."\n";
push(@kill_Queue,$result1[0]);
}
}
$killQueueLen=@kill_Queue;
print "###################################################################\n";
print "We will kill '$killQueueLen' processes!!\n";
print "Are you sure about kill the processes above?[y/n]";
$yesorno=<STDIN>;
chomp($yesorno);
if($yesorno eq "Y" or $yesorno eq "y")
{
print "###################################################################\n";
foreach $kill_Queue (@kill_Queue)
{
print $kill_Queue;
chomp($kill_Queue);
if($kill_Queue ne "")
{
`kill -9 '$kill_Queue'`;
}
}
}
elsif($yesorno eq "N" or $yesorno eq "n")
{
@kill_Queue=();
$arg2="";
next;
}
else
{
print "###################################################################\n";
print "JUEST Y or N!!!!\n";
print "###################################################################\n";
next;
}
print "OK\n";
exit;
}
elsif($confirm eq "N" or $confirm eq "n")
{
exit 0;
}
else
{
print "Please input [y/n]:";
next;
}
}
else
{
if($arg2 =~ /^[+-]?\d+$/)
{
@result=`ps -eo lstart,pid,args | grep $arg1 | grep -v grep`;
my @kill_Queue="";
print "killed list\n";
print "###################################################################\n";
foreach $result ( @result)
{
if($result ne "")
{
@result1 =split(/\s+/,$result);
$time_start=$result1[1]." ".$result1[2]." ".$result1[3]." ".$result1[4];
$format_time=`date -d '$time_start' '+%Y/%m/%d %T'`;
chomp($format_time);
$pro_st_time=`date +%s -d '$format_time'`;
$a1=`date`;
chomp($a1);
chomp($pro_st_time);
chomp($kill_time);
$cur_time=`date +%s -d '$a1'`;
$kill_time=$cur_time-$arg2;
if($pro_st_time > $kill_time)
{
print $result1[5]." ".$result1[6]." ".$result1[7]."\n";
push(@kill_Queue,$result1[5]);
}
}
else
{
next;
}
}
$killQueueLen=@kill_Queue-1;
print "###################################################################\n";
print "We will kill '$killQueueLen' processes!!\n";
print "Are you sure about kill the processes above?[y/n]";
$yesorno=<STDIN>;
chomp($yesorno);
if($yesorno eq "Y" or $yesorno eq "y")
{
foreach $kill_Queue (@kill_Queue)
{
chomp($kill_Queue);
if($kill_Queue ne "")
{
`kill -9 '$kill_Queue'`;
}
}
}
elsif($yesorno eq "N" or $yesorno eq "n")
{
$arg2="";
next;
}
}
}
print "retry";
}
print "End of the script\n";
print "================================================================\n"; 腳本的基本功能就是，可以數據要過濾的進程例如"LOCAL=NO“，然後獲得所有匹配進程的開始時間和進程內容。然後，需要數據要kill的進程是在當前時間點之前多少秒開始的進程。如果輸入null的話。就是kill掉所有匹配的進程。如果輸入1000的話，就是kill掉所有在過去1000秒鐘開始的標記爲”LOCAL=NO“的所有的進程。
執行完過程之後，就應該可以連接到數據庫中。調整process參數。保證系統正常運行，然後再查詢導致此錯誤的原因。
這樣的話，我們就可以儘可能的減少對系統的影響。
當前腳本知識在linux上測試過，沒有在其他類unix系統測試。