摘要:
1、free命令 free -m total used free shared buffers cachedMem: 1526 182 1344 0 16 99-/+ buffers/cache: 65 1460Swap: 3071 0 3071很清晰明白的显示出了总内存多少,已使用多少,还剩下多少 阅读全文
摘要:
to_timestamp: select to_timestamp('2012-12-31', 'yyyy-mm-dd hh12.mi.ss') from dual; result: 31-DEC-12 12.00.00.000000000 AM to_date select to_date(sys 阅读全文