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4、sort order by:单纯的排序 5、sort group by:排序并分组 6、buffer sort:对临时结果进行一次内存排序。 八、其他执行计划 1、view: 2、count: 3、stopkey:目标sql中存在rownum<10这种情况。 4、hash group by: 5、inlist iterator: 6、filter:过滤,相当于处理过的排序合并连接。 7、remote:与dblink相关...
select sql_id,child_number,name,datatype_string,max_length from v$sql_bind_capture a where a.sql_id='5tvfxfkm0b81p'order byCHILD_NUMBER;--alter system flush shared_pool;SYS@ORCLCDB>select banner_full from v$version;BANNER_FULL---Oracle Database 19c Enterprise Edition Release19.0.0.0.0-...
SQL> create table t_objects as select * from dba_objects; 表已创建。 SQL> create index ind_obj_id on t_objects(object_id); 索引已创建。 SQL> create table t_tab as select * from dba_tables; 表已创建。 SQL> create table t_ind as select * from dba_indexes; 表已创建。 SQL> creat...
delete from cs a where (a.xm,a.zjh,a.dz) in (select xm,zjh,dz from cs group by xm,zjh,dz having count(*)>1) and rowid not in (select min(rowid) from cs group by xm,zjh,dz having count(*)>1) ③row_number()over(partition by 列) ...
CREATE TABLE OPEN_TABLEBAK AS select * from gv$open_cursor; CREATE TABLE ASH_TABLEBAK AS select * from gv$active_session_history; 查询锁及当前SQL 当锁正在发生时,可以及时查看当前正在执行语句及锁定情况: 1.获取锁模式及相关对象: col OWNER for a10 ...
SELECT b.sid oracleID, b.username 登录Oracle用户名, b.serial#, spid 操作系统ID, paddr, sql_text 正在执行的SQL, b.machine 计算机名 FROM v$process a, v$session b, v$sqlarea c WHERE a.addr = b.paddr AND b.sql_hash_value = c.hash_value...
A format model is a character literal that describes the format of DATE or NUMBER data stored in a character string. When you convert a character string into a date or number, a format model tells Oracle how to interpret the string. In SQL statements, you can use a format model as an ...
CREATE TABLE OPEN_TABLEBAK AS select * from gv$open_cursor; CREATE TABLE ASH_TABLEBAK AS select * from gv$active_session_history; 1. 2. 查询锁及当前SQL 当锁正在发生时,可以及时查看当前正在执行语句及锁定情况: 1.获取锁模式及相关对象: ...
select_sql = """select employee_id, department_id from employees where employee_id in (:1, :2)""" update_sql = "update employees set department_id=:1 where employee_id=:2" self.__db.begin() self.__cursor.execute(select_sql, (employee_id1, employee_id2)) ...