Mem:   3765572k total,  3663796k used,   101776k free,    42856k buffe
+rs
Swap:  2031608k total,      368k used,  2031240k free,  3141516k cache
+d
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Well, that just tells you that the memory of your system is being used, but it doesn't tell how much is e.g. file system cache or such. That said:

Use placeholders. Learn about why.

$insert_str = "insert into $mysql_table (data1, data2, data3, data4, d
+ata5) values(?,?,?,?,?)";
$sth        = $dbh->prepare($insert_str);

$sth->execute($cdate, $clang, $csrc, $ccode, $cuniqueid);
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Placeholders also avoid backslashitis.