如何生成AWR report？ Connect to Oracle DB as sysdba or "/":   set ORACLE_SID= yoursid; sqlplus sys/pwd as sysdba alter system flush shared_pool; alter system flush buffer_cache; Run the following command,来创建一个snapshot,并记 ...

Normally use the String concatenations using :  +, StringBuffer.append(), String.concat(). We always think that using ‘+’ operator for String Concatenation is slow.  This is true but not always. For Ex: String str = “Th ...