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标签归档:alter system cancel sql
18c新特性:alter system cancel sql
根据18c官方描述cancel sql功能是在18c中引起,但是实测发现在oracle 12.2中已经有了cancel sql功能,可以实现终止掉某个sql的当前sql正在执行的sql语句,而不是传统的直接kill某个会话.ALTER SYSTEM CANCEL SQL语句有四个参数分别为:
--会话1 SQL> set lines 150 SQL> select * from v$version; BANNER CON_ID -------------------------------------------------------------------------------- ---------- Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production 0 PL/SQL Release 12.2.0.1.0 - Production 0 CORE 12.2.0.1.0 Production 0 TNS for Linux: Version 12.2.0.1.0 - Production 0 NLSRTL Version 12.2.0.1.0 - Production 0 SQL> select sid, serial# from v$session where sid in 2 (select sid from v$mystat where rownum=1); SID SERIAL# ---------- ---------- 278 4019 SQL> create table t_xifenfei tablespace users as select * from dba_source; Table created. SQL> insert into t_xifenfei select * from t_xifenfei; 274132 rows created. <<===没有提交 SQL> select count(*)from t_xifenfei; COUNT(*) ---------- 548264 SQL> insert into t_xifenfei select * from t_xifenfei; 548264 rows created. <<===没有提交 SQL> select count(*)from t_xifenfei; COUNT(*) ---------- 1096528 SQL> insert into t_xifenfei select * from t_xifenfei; --会话2 SQL> select count(*)from t_xifenfei; COUNT(*) ---------- 274132 SQL> alter system cancel sql '278,4019'; System altered. SQL> select count(*)from t_xifenfei; COUNT(*) ---------- 274132 --会话1 SQL> insert into t_xifenfei select * from t_xifenfei; insert into t_xifenfei select * from t_xifenfei * ERROR at line 1: ORA-01013: user requested cancel of current operation SQL> select count(*)from t_xifenfei; COUNT(*) ---------- 1096528
这里可以看到会话1的最后一个insert被cancel,但是前面两个没有提交的insert没有被回滚/提交,看到了cancel sql的功能的实现.