• Oracle常用SQL


    --查询表空间使用情况   

    SELECT UPPER(F.TABLESPACE_NAME) "表空间名",
      D.TOT_GROOTTE_MB "表空间大小(M)",
      D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",
      TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) /
    D.TOT_GROOTTE_MB * 100,
    2),
    '990.99') || '%' "使用比",
      F.TOTAL_BYTES "空闲空间(M)",
      F.MAX_BYTES "最大块(M)"   FROM (SELECT TABLESPACE_NAME,
      ROUND(SUM(BYTES) /
    (1024 * 1024),
    2) TOTAL_BYTES,
      ROUND(MAX(BYTES) /
    (1024 * 1024),
    2) MAX_BYTES   FROM SYS.DBA_FREE_SPACE   GROUP BY TABLESPACE_NAME) F,
       (SELECT DD.TABLESPACE_NAME,
       ROUND(SUM(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB   FROM SYS.DBA_DATA_FILES DD   GROUP BY DD.TABLESPACE_NAME) D   WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME   ORDER BY 1;
       --查询表空间的free space   
    select tablespace_name,
      count(*) as extends,
      round(sum(bytes) / 1024 / 1024, 2) as MB,
      sum(blocks) as blocks   from dba_free_space   group by tablespace_name;
       --查询表空间的总容量   
    select tablespace_name,
    sum(bytes) / 1024 / 1024 as MB   from dba_data_files   group by tablespace_name;
       --查询表空间使用率   
    select total.tablespace_name,
      round(total.MB, 2) as Total_MB,
    考试大论坛   round(total.MB - free.MB, 2) as Used_MB,
      round((1 - free.MB / total.MB) * 100, 2) || '%' as Used_Pct   from (select tablespace_name,
    sum(bytes) / 1024 / 1024 as MB   from dba_free_space   group by tablespace_name) free,
       (select tablespace_name,
    sum(bytes) / 1024 / 1024 as MB   from dba_data_files   group by tablespace_name) total   where free.tablespace_name = total.tablespace_name;
    1.查找当前表级锁的SQL如下:
    select sess.sid,
    sess.serial#,
    lo.oracle_username,
    lo.os_user_name,
    ao.object_name,
    lo.locked_mode
    from v$locked_object lo, dba_objects ao, v$session sess
    where ao.object_id = lo.object_id
    and lo.session_id = sess.sid;
    2.杀掉锁表进程: alter system kill session '436,35123';
    3.RAC环境中锁查找:
    SELECT inst_id,
    DECODE(request, 0, 'Holder: ', 'Waiter: ') || sid sess,
    id1,
    id2,
    lmode,
    request,
    type,
    block,
    ctime
    FROM GV$LOCK
    WHERE (id1, id2, type) IN
    (SELECT id1, id2, type FROM GV$LOCK WHERE request > 0)
    ORDER BY id1, request;
    4.监控当前数据库谁在运行什么SQL语句
    select osuser, username, sql_text
    from v$session a, v$sqltext b
    where a.sql_address = b.address
    order by address, piece;
    5.找使用CPU多的用户session
    select a.sid,
    spid,
    status,
    substr(a.program, 1, 40) prog,
    a.terminal,
    osuser,
    value / 60 / 100 value
    from v$session a, v$process b, v$sesstat c
    where c.statistic# = 12
    and c.sid = a.sid
    and a.paddr = b.addr
    order by value desc;
    6.查看死锁信息
    SELECT (SELECT username FROM v$session WHERE SID = a.SID) blocker,
    a.SID,
    'is blocking',
    (SELECT username FROM v$session WHERE SID = b.SID) blockee,
    b.SID
    FROM v$lock a, v$lock b
    WHERE a.BLOCK = 1
    AND b.request > 0
    AND a.id1 = b.id1
    AND a.id2 = b.id2;
    7.具有最高等待的对象
    SELECT o.OWNER,
    o.object_name,
    o.object_type,
    a.event,
    SUM(a.wait_time + a.time_waited) total_wait_time
    FROM v$active_session_history a, dba_objects o
    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
    AND a.current_obj# = o.object_id
    GROUP BY o.OWNER, o.object_name, o.object_type, a.event
    ORDER BY total_wait_time DESC;
    SELECT a.session_id,
    s.osuser,
    s.machine,
    s.program,
    o.owner,
    o.object_name,
    o.object_type,
    a.event,
    SUM(a.wait_time + a.time_waited) total_wait_time
    FROM v$active_session_history a, dba_objects o, v$session s
    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
    AND a.current_obj# = o.object_id
    AND a.session_id = s.SID
    GROUP BY o.owner,
    o.object_name,
    o.object_type,
    a.event,
    a.session_id,
    s.program,
    s.machine,
    s.osuser
    ORDER BY total_wait_time DESC;
    8.查询当前连接会话数
    select s.value, s.sid, a.username
    from v$sesstat S, v$statname N, v$session A
    where n.statistic# = s.statistic#
    and name = 'session pga memory'
    and s.sid = a.sid
    order by s.value;
    9.等待最多的用户
    SELECT s.SID,
    s.username,
    SUM(a.wait_time + a.time_waited) total_wait_time
    FROM v$active_session_history a, v$session s
    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
    GROUP BY s.SID, s.username
    ORDER BY total_wait_time DESC;
    10.等待最多的SQL
    SELECT a.program,
    a.session_id,
    a.user_id,
    d.username,
    s.sql_text,
    SUM(a.wait_time + a.time_waited) total_wait_time
    FROM v$active_session_history a, v$sqlarea s, dba_users d
    WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
    AND a.sql_id = s.sql_id
    AND a.user_id = d.user_id
    GROUP BY a.program, a.session_id, a.user_id, s.sql_text, d.username;
    11.查看消耗资源最多的SQL
    SELECT hash_value, executions, buffer_gets, disk_reads, parse_calls
    FROM V$SQLAREA
    WHERE buffer_gets > 10000000
    OR disk_reads > 1000000
    ORDER BY buffer_gets + 100 * disk_reads DESC;
    12.查看某条SQL语句的资源消耗
    SELECT hash_value, buffer_gets, disk_reads, executions, parse_calls
    FROM V$SQLAREA
    WHERE hash_Value = 228801498
    AND address = hextoraw('CBD8E4B0');
    13.查询会话执行的实际SQL
    SELECT a.SID, a.username, s.sql_text
    FROM v$session a, v$sqltext s
    WHERE a.sql_address = s.address
    AND a.sql_hash_value = s.hash_value
    AND a.status = 'ACTIVE'
    ORDER BY a.username, a.SID, s.piece;
    14.显示正在等待锁的所有会话
    SELECT * FROM DBA_WAITERS;

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  • 原文地址:https://www.cnblogs.com/luxd/p/6245771.html
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