dba_kgllock解释

SQL>  select sid,saddr from v$session where saddr in ('2F397004','2E063BA8','2F391B2C');

       SID SADDR
---------- --------
	20 2F397004
	22 2F391B2C  ----被堵塞 library cache lock
      1137 2E063BA8  ----被堵塞 library cache pin
 

SQL> select * from dba_kgllock where  KGLLKREQ >0;

KGLLKUSE KGLLKHDL   KGLLKMOD   KGLLKREQ KGLL
-------- -------- ---------- ---------- ----
2F391B2C 31A3F6FC	   0	      3 Lock
2E063BA8 31A3F6FC	   0	      3 Pin


SQL> select * from dba_kgllock where KGLLKHDL='31A3F6FC';

KGLLKUSE KGLLKHDL   KGLLKMOD   KGLLKREQ KGLL
-------- -------- ---------- ---------- ----
2F391B2C 31A3F6FC	   0	      3 Lock
2F397004 31A3F6FC	   1	      0 Lock
2E063BA8 31A3F6FC	   3	      0 Lock
2E063BA8 31A3F6FC	   0	      3 Pin
2F397004 31A3F6FC	   2	      0 Pin


其中
<pre name="code" class="sql">KGLLKUSE <span style="font-family: Arial, Helvetica, sans-serif;">  = SADDR</span>

KGLLKHDL ---句柄 KGLLKMOD 持有pin/lock的模式(0为no lock/pin held﹐1为null,2为share﹐3为exclusive)KGLLKREQ 请求pin/lock的模式(0为no lock/pin held﹐1为null,2为share﹐3为exclusive)