CREATE OR REPLACE PROCEDURE SOLVE_LOCK

AS

V_SQL VARCHAR2(3000); --定义 v_sql 接受抓取锁的sql语句
V_SQL02 VARCHAR2(3000);
V_SQL03 VARCHAR2(3000);

KILL_SID NUMBER;
KILL_SERIAL NUMBER;

CUR_LOCK SYS_REFCURSOR; --定义游标变量，循环执行抓取锁的sql语句
CUR_LOCK02 SYS_REFCURSOR;

TYPE TP_LOCK IS RECORD( --定义 record类型的 变量
V_SID NUMBER,
V_TYPE VARCHAR2(10),
V_ID1 NUMBER,
V_ID2 NUMBER,
V_LMODE VARCHAR2(200),
V_REQUEST VARCHAR2(200),
V_LOCK_TIME NUMBER,
V_BLOCK NUMBER );
RECORDS_LOCK TP_LOCK;

TYPE TP_LOCK02 IS RECORD(
WAITING_SID NUMBER,
WAITING_SQL VARCHAR2(1000),
BLOCKER_EVENT VARCHAR2(1000),
BLOCKING_SID NUMBER,
BLOCKING_SQL VARCHAR2(1000));
RECORDS_LOCK02 TP_LOCK02;

V_BLOCKING_SID NUMBER;
V_WAITING_SID NUMBER;

BEGIN
 
DBMS_OUTPUT.PUT_LINE('------------------查找数据库中是否有锁阻塞、锁等待的情况------------------');
V_SQL:='SELECT SID,TYPE,ID1,ID2,
DECODE(LMODE,0, ''NONE'',1,''NULL'', 2, ''ROW SHARE'' ,3, ''ROW EXCLUSIVE'' ,4, ''SHARE'' ,5, ''SHARE ROW EXCLUSIVE'' ,6 ,''EXCLUSIVE'' ,''HAHA'') LOCK_TYPE,
DECODE(REQUEST,0, ''NONE'',1,''NULL'', 2, ''ROW SHARE'' ,3, ''ROW EXCLUSIVE'' ,4, ''SHARE'' ,5, ''SHARE ROW EXCLUSIVE'' ,6 ,''EXCLUSIVE'' ,''HAHA'') LOCK_REQUEST,
CTIME,BLOCK FROM V$LOCK WHERE TYPE IN (''TM'',''TX'')' ;

OPEN CUR_LOCK FOR V_SQL;
LOOP
FETCH CUR_LOCK INTO RECORDS_LOCK;
EXIT WHEN CUR_LOCK%NOTFOUND;

IF RECORDS_LOCK.V_REQUEST <> 'NONE' THEN --抓取发出请求锁的会话
DBMS_OUTPUT.PUT_LINE('waiting sid: '||RECORDS_LOCK.V_SID||' is request a lock ,lock_mode is '||RECORDS_LOCK.V_REQUEST||' and being locked '|| RECORDS_LOCK.V_LOCK_TIME||'s');
V_WAITING_SID:=RECORDS_LOCK.V_SID;
END IF;

IF RECORDS_LOCK.V_BLOCK <> 0 THEN --抓取发生锁阻塞的会话
DBMS_OUTPUT.put_line('blocking sid: '||RECORDS_LOCK.V_SID||' is make a lock , lock_mode is '||RECORDS_LOCK.V_LMODE);
V_BLOCKING_SID:=RECORDS_LOCK.V_SID;
END IF;
END LOOP;
CLOSE CUR_LOCK;

DBMS_OUTPUT.PUT_LINE('------------------查找产生锁的会话、锁等待的会话------------------------');
V_SQL02:='SELECT DISTINCT
WAITER.SID "WAITING_SID",
W_SQL.SQL_TEXT "SQL FROM WAITING SESSION",

BLOCKER.EVENT "BLOCKER EVENT",
BLOCKER.SID "BLOCKING SID",

B_SQL.SQL_TEXT "SQL FROM BLOCKING SESSION"

FROM V$SESSION WAITER,
V$SESSION BLOCKER,
V$SQL W_SQL,
V$SQL B_SQL
WHERE WAITER.EVENT=''enq: TX - row lock contention'' AND WAITER.BLOCKING_SESSION=BLOCKER.SID
AND W_SQL.SQL_ID=WAITER.SQL_ID
AND B_SQL.SQL_ID =NVL(BLOCKER.SQL_ID,BLOCKER.PREV_SQL_ID)';

OPEN CUR_LOCK02 FOR V_SQL02;
LOOP  
FETCH CUR_LOCK02 INTO RECORDS_LOCK02;
EXIT WHEN CUR_LOCK02%NOTFOUND;

IF RECORDS_LOCK02.WAITING_SID IS NOT NULL THEN
DBMS_OUTPUT.put_line('waiting sid: '||RECORDS_LOCK02.WAITING_SID||' WAIT_SQL IS: '||RECORDS_LOCK02.WAITING_SQL);
END IF;

IF RECORDS_LOCK02.BLOCKING_SID IS NOT NULL THEN
DBMS_OUTPUT.put_line('blocking sid: '||RECORDS_LOCK02.BLOCKING_SID||' BLOCK_SQL IS: '||RECORDS_LOCK02.BLOCKING_SQL);
END IF;

END LOOP;

CLOSE CUR_LOCK02;

DBMS_OUTPUT.PUT_LINE('------------------解决 锁阻塞、锁等待------------------');

SELECT   SID,SERIAL# INTO KILL_SID,KILL_SERIAL FROM V$SESSION WHERE SID=V_BLOCKING_SID ;
   
DBMS_OUTPUT.put_line('ACTION: ALTER SYSTEM KILL SESSION ( '||KILL_SID||','||KILL_SERIAL||')');

END SOLVE_LOCK;