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Oracle案例:利用存储过程进行表数据分离

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2016-06-07 16:40:541068browse

某客户有个需求,有2张业务表,数据量比较大,有2000W行,现在的需求是把这2张表中的一部分记录,根据一定的where条件分离出去,

某客户有个需求,有2张业务表,数据量比较大,有2000W行,现在的需求是把这2张表中的一部分记录,根据一定的where条件分离出去,创建到另外的归档表中,即做表记录的迁移操作。最后得到的结果是:未满足筛选条件的记录留在原表中,满足筛选条件的表要插入到归档表中,并且要在原表中删除这些插入到归档表中的全部记录,最后满足:新表记录+归档记录=原表记录数

下面我来模拟一下这个过程:
由于没有拿到具体的建表语句,这里把表的内容最简化,只留2个列,作为最基本的演示


--连接到测试用户,创建测试表
SQL> conn zlm/zlm
Connected.
SQL> select * from cat;


no rows selected
SQL> create table tabhdr(tabhdrid number(10),status number(10));


Table created.


SQL> create table tabdet(tabhdrid number(10));


Table created.


SQL> create table arch_tabdet as select * from tabdet;


Table created.


SQL> create table arch_tabhdr as select * from tabhdr;


Table created.


--创建操作日志表
SQL> create table arch_log(
  2        archbegintime char(19),
  3        archmiddletime char(19),
  4        archendtime  char(19),
  5        archinscount1    number,
  6        archdelcount1    number,
  7        archinscount2    number,
  8        archdelcount2    number,
  9        archstatus    varchar2(20),
 10        archerrorcode varchar2(20),
 11        archerrormsg  varchar2(1000));


Table created.


操作日志表字段说明:
archbegintime->archimiddletime    //第一次迁移操作(insert+delete)的时间
archimiddletime->archendtime    //第二次迁移操作(insert+delete)的时间
archcount1    //第一次迁移操作(insert+delete)的数据量
archcount2    //第二次迁移操作(insert+delete)的数据量
archstatus    //操作状态(success/failure)
archerrorcode    //报错代码
archerrormsg    //报错信息


--插入测试数据(每个表插入10W条记录,仅测试功能没必要用很大的数据)
SQL> begin
  2  for i in 1..100000
  3  loop
  4  insert into tabhdr values(i,9);
  5  insert into tabdet values(i);
  6  end loop;
  7  commit;
  8  end;
  9  /


PL/SQL procedure successfully completed.


--创建存储过程detach_pro
SQL> create or replace procedure detach_pro
  2  is
  3    maxrows number default 10000;
  4    rowid_table dbms_sql.Urowid_Table;
  5    i number;
  6    cursor cur_1 is SELECT a.rowid FROM tabdet a WHERE tabhdrid IN(SELECT tabhdrid FROM tabhdr WHERE STATUS=9)  order by a.rowid;
  7    cursor cur_2 is SELECT a.rowid FROM tabhdr a WHERE status=9 order by a.rowid;
  8   
  9    v_begintime char(19):=to_char(sysdate,'yyyy-mm-dd hh:mi:ss');
 10    v_middletime char(19);
 11    v_inscount1  number:=0;
 12    v_delcount1  number:=0;
 13    v_inscount2  number:=0;
 14    v_delcount2  number:=0;
 15    v_errcode varchar2(100);
 16    v_errerrm varchar2(1000);
 17   
 18  begin
 19    open cur_1;
 20    loop   
 21      exit when cur_1%notfound;
 22      fetch cur_1 bulk collect into rowid_table limit maxrows;
 23     
 24      forall i in 1 .. rowid_table.count
 25      insert into arch_tabdet select * from tabdet where rowid = rowid_table(i);
 26      commit;
 27      v_inscount1:=v_inscount1+rowid_table.count;
 28      forall i in 1 .. rowid_table.count
 29      delete from tabdet where rowid = rowid_table(i);
 30      commit;
 31      v_delcount1:= v_delcount1+rowid_table.count;
 32    end loop;
 33    close cur_1;
 34    v_middletime:=to_char(sysdate,'yyyy-mm-dd hh:mi:ss');
 35    open cur_2;
 36    loop 
 37      exit when cur_2%notfound;
 38      fetch cur_2 bulk collect    into rowid_table limit maxrows;
 39     
 40      forall i in 1 .. rowid_table.count
 41      insert into arch_tabhdr select * from tabhdr where rowid = rowid_table(i);
 42      commit;
 43      v_inscount2:=v_inscount2+rowid_table.count;
 44      forall i in 1 .. rowid_table.count
 45      delete from tabhdr where rowid = rowid_table(i);
 46      commit;
 47      v_delcount2:= v_delcount2+rowid_table.count;
 48    end loop;
 49    close cur_2; 
 50    insert into arch_log values (v_begintime,v_middletime,to_char(sysdate,'yyyy-mm-dd hh:mi:ss'), v_inscount1,v_delcount1,v_inscount2,v_delcount2,'success',null,null);
 51    commit;
 52  exception
 53    when others then
 54        v_errcode :=sqlcode;
 55        v_errerrm :=sqlerrm;
      insert into arch_log values (v_begintime,v_middletime,to_char(sysdate,'yyyy-mm-dd hh:mi:ss'),  v_inscount1,v_delcount1,v_inscount2,v_delcount2,'failure',v_errcode,v_errerrm);
 57        commit;
 58  end;
 59  /


Procedure created.


--开始第1次测试
SQL> select count(*) from tabdet;


  COUNT(*)
----------
    100000


SQL> select count(*) from tabhdr;


  COUNT(*)
----------
    100000

 


SQL> select count(*) from arch_tabdet;


  COUNT(*)
----------
        0


SQL> select count(*) from arch_tabdet;


  COUNT(*)
----------
        0


SQL> exec detach_pro;


PL/SQL procedure successfully completed.


SQL> select count(*) from tabdet;


  COUNT(*)
----------
        0


SQL> select count(*) from tabhdr;


  COUNT(*)
----------
        0


SQL> select count(*) from arch_tabdet;


  COUNT(*)
----------
    100000


SQL> select count(*) from arch_tabhdr;


  COUNT(*)
----------
    100000


SQL> select * from arch_log;

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