ORACLE内存、资源、会话信息查询语句

查看 相关会话

SELECT 
    s.SID AS 会话ID, 
		p.spid AS "操作系统进程 ID",
    s.SERIAL# AS 序列号, 
    s.USERNAME AS 用户名, 
    s.STATUS AS 状态, 
		round(p.pga_used_mem/1024/1024/1024, 2) AS "PGA 已使用内存（G）", 
    round(p.pga_alloc_mem/1024/1024/1024, 2) AS "PGA 已分配内存（G）",
		round(p.PGA_FREEABLE_MEM/1024/1024/1024, 2) AS "PGA 可释放PGA内存（G）",
		round(p.PGA_MAX_MEM/1024/1024/1024, 2) AS "PGA 最大PGA内存（G）",
    s.MACHINE AS 机器名, 
    s.PROGRAM AS 程序名 
FROM 
    V$SESSION s
JOIN v$process p ON s.paddr = p.addr
WHERE 
    s.USERNAME = 'MJF';

查看 会话的等待事件

SELECT 
    SID AS 会话ID, 
    EVENT AS 事件, 
    WAIT_CLASS AS 等待类别, 
    SECONDS_IN_WAIT AS 等待秒数 
FROM 
    V$SESSION_WAIT 
WHERE 
    SID IN (SELECT SID FROM V$SESSION WHERE USERNAME = 'MJF');

查看 执行的 SQL 语句

SELECT 
    SQL_TEXT AS SQL文本, 
    EXECUTIONS AS 执行次数, 
    DISK_READS AS 磁盘读取次数, 
    BUFFER_GETS AS 缓冲区获取次数, 
    CPU_TIME AS CPU时间, 
    ELAPSED_TIME AS 总耗时 
FROM 
    V$SQLAREA 
WHERE 
    PARSING_USER_ID = (SELECT USER_ID FROM ALL_USERS WHERE USERNAME = 'MJF');

查看系统资源限制

SELECT 
    RESOURCE_NAME AS 资源名称, 
    CURRENT_UTILIZATION AS 当前使用量, 
    MAX_UTILIZATION AS 最大使用量, 
    LIMIT_VALUE AS 限制值 
FROM 
    V$RESOURCE_LIMIT;