利用存储过程进行表数据分离的案例分享，存储过程案例
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;
ARCHBEGINTIME ARCHMIDDLETIME ARCHENDTIME ARCHINSCOUNT1 ARCHDELCOUNT1 ARCHINSCOUNT2 ARCHDELCOUNT2 ------------------- ------------------- ------------------- ------------- ------------- ------------- ------------- ARCHSTATUS ARCHERRORCODE -------------------- -------------------- ARCHERRORMSG ---------------------------------------------------------------------------------------------------------------------------------- 2014-12-30 10:30:45 2014-12-30 10:30:53 2014-12-30 10:31:02 100000 100000 100000 100000 success
可以看到，执行了存储过程detach_pro以后，原来的两张表中都没有数据了，全部分离到归档表arch_tabdet和arch_tabhdr中去了，当然这是一种极端情况，之前插入的数据都是符合插入到归档表的筛选条件的，即字段"status=9"。操作日志表中记录了各表的插入和删除操作，以及执行的时间。
如果有新的记录插入原表，但是并不符合插入归档表中的筛选条件，比如status=8，来看一下测试结果：
--第2次测试（插入10000条status=8的记录） SQL> begin
2 for i in 1..10000 3 loop 4 insert into tabhdr values(i,8); 5 insert into tabdet values(i); 6 end loop; 7 commit; 8 end; 9 /
PL/SQL procedure successfully completed.
SQL> exec detach_pro;
PL/SQL procedure successfully completed.
SQL> exec detach_pro;
PL/SQL procedure successfully completed.
SQL> select count(*) from tabdet;
COUNT(*) ---------- 10000
SQL> select count(*) from tabhdr;
COUNT(*) ---------- 10000
SQL> select count(*) from arch_tabdet;
COUNT(*) ---------- 100000
SQL> select count(*) from arch_tabhdr;
COUNT(*) ---------- 100000
SQL> select * from arch_log;
ARCHBEGINTIME ARCHMIDDLETIME ARCHENDTIME ARCHINSCOUNT1 ARCHDELCOUNT1 ARCHINSCOUNT2 ARCHDELCOUNT2 ------------------- ------------------- ------------------- ------------- ------------- ------------- ------------- ARCHSTATUS ARCHERRORCODE -------------------- -------------------- ARCHERRORMSG ---------------------------------------------------------------------------------------------------------------------------------- 2014-12-30 10:30:45 2014-12-30 10:30:53 2014-12-30 10:31:02 100000 100000 100000 100000 success
2014-12-30 10:43:38 2014-12-30 10:43:38 2014-12-30 10:43:38 0 0 0 0 success
ARCHBEGINTIME ARCHMIDDLETIME ARCHENDTIME ARCHINSCOUNT1 ARCHDELCOUNT1 ARCHINSCOUNT2 ARCHDELCOUNT2 ------------------- ------------------- ------------------- ------------- ------------- ------------- ------------- ARCHSTATUS ARCHERRORCODE -------------------- -------------------- ARCHERRORMSG ----------------------------------------------------------------------------------------------------------------------------------
2014-12-30 10:44:28 2014-12-30 10:44:28 2014-12-30 10:44:28 0 0 0 0 success
SQL>
发现执行detach_pro的速度很快，而且原表和归档表的记录都没有发生变化，因为status=8不符合筛选条件，执行存储过程并不会进行迁移操作，即使没有操作成功。由于刚才执行了2次存储过程，就会在记录表中生成2行操作结果的记录
--第3次测试（再次插入1000条符合筛选条件的记录，status=9) SQL> begin
2 for i in 1..1000 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.
SQL> exec detach_pro;
PL/SQL procedure successfully completed.
SQL> select count(*) from tabdet;
COUNT(*) ---------- 9000
SQL> select count(*) from tabhdr;
COUNT(*) ---------- 10000
SQL> select count(*) from arch_tabdet;
COUNT(*) ---------- 102000
SQL> select count(*) from arch_tabhdr;
COUNT(*) ---------- 101000
SQL> select * from arch_log;
ARCHBEGINTIME ARCHMIDDLETIME ARCHENDTIME ARCHINSCOUNT1 ARCHDELCOUNT1 ARCHINSCOUNT2 ARCHDELCOUNT2 ------------------- ------------------- ------------------- ------------- ------------- ------------- ------------- ARCHSTATUS ARCHERRORCODE -------------------- -------------------- ARCHERRORMSG ---------------------------------------------------------------------------------------------------------------------------------- 2014-12-30 10:30:45 2014-12-30 10:30:53 2014-12-30 10:31:02 100000 100000 100000 100000 success
2014-12-30 10:43:38 2014-12-30 10:43:38 2014-12-30 10:43:38 0 0 0 0 success
ARCHBEGINTIME ARCHMIDDLETIME ARCHENDTIME ARCHINSCOUNT1 ARCHDELCOUNT1 ARCHINSCOUNT2 ARCHDELCOUNT2 ------------------- ------------------- ------------------- ------------- ------------- ------------- ------------- ARCHSTATUS ARCHERRORCODE -------------------- -------------------- ARCHERRORMSG ----------------------------------------------------------------------------------------------------------------------------------
2014-12-30 10:44:28 2014-12-30 10:44:28 2014-12-30 10:44:28 0 0 0 0 success
2014-12-30 10:53:15 2014-12-30 10:53:15 2014-12-30 10:53:15 2000 2000 1000 1000 success
ARCHBEGINTIME ARCHMIDDLETIME ARCHENDTIME ARCHINSCOUNT1 ARCHDELCOUNT1 ARCHINSCOUNT2 ARCHDELCOUNT2 ------------------- ------------------- ------------------- ------------- ------------- ------------- ------------- ARCHSTATUS ARCHERRORCODE -------------------- -------------------- ARCHERRORMSG ----------------------------------------------------------------------------------------------------------------------------------
第一次迁移操作： tabdet表中的2000行记录被插入到arch_tabdet表中，然后删除tabdet表中的2000行相应记录； 因此结果是tabdet表剩下9000条记录，arch_tabdet表增加到12000条记录。
第二次迁移操作：
tabhdr表中的1000行记录被插入到arch_tabhdr表中，然后删除tabhdr表中的1000行相应记录； 因此结果是tabhdr表剩下10000条记录，arch_tabhdr表增加到11000条记录。
在实际生产中，具体是哪些符合迁移条件的表是根据存储过程中具体的where条件来定的，这里的测试并不一定很准确。
最后，可以通过创建job来定期自动运行存储过程，如： declare
v_jobnum number; begin
dbms_job.submit(v_jobnum,'detach_pro',sysdate,'sysdate+1/24');
end; commit; 或：
declare v_jobnum number;
begin
dbms_job.submit
( job => v_jobnum
,what => 'detach_pro'
,next_date => sysdate
,interval => 'SYSDATE+1/24'
,no_parse => TRUE
);
end;
/
commit;
--把存储过程防止到job中，每小时自动运行
SQL> declare v_jobnum number;
2 begin
3 dbms_job.submit
4 ( job => v_jobnum
5 ,what => 'detach_pro'
6 ,next_date => sysdate
7 ,interval => 'SYSDATE+1/24'
8 ,no_parse => TRUE
9 );
10 end;
11 /
PL/SQL procedure successfully completed.
SQL> commit;
Commit complete.
SQL> desc user_jobs;
Name Null? Type
----------------------------------------------------------------------- -------- ------------------------------------------------
JOB NOT NULL NUMBER
LOG_USER NOT NULL VARCHAR2(30)
PRIV_USER NOT NULL VARCHAR2(30)
SCHEMA_USER NOT NULL VARCHAR2(30)
LAST_DATE DATE
LAST_SEC VARCHAR2(8)
THIS_DATE DATE
THIS_SEC VARCHAR2(8)
NEXT_DATE NOT NULL DATE
NEXT_SEC VARCHAR2(8)
TOTAL_TIME NUMBER
BROKEN VARCHAR2(1)
INTERVAL NOT NULL VARCHAR2(200)
FAILURES NUMBER
WHAT VARCHAR2(4000)
NLS_ENV VARCHAR2(4000)
MISC_ENV RAW(32)
INSTANCE NUMBER
SQL> col interval for a15
SQL> col what for a15
SQL> select job,next_date,interval,what from user_jobs;
JOB NEXT_DATE INTERVAL WHAT
---------- --------- --------------- ---------------
5 30-DEC-14 SYSDATE+1/24 detach_pro
4 01-JAN-00 SYSDATE+1/24/60 xxx_pro;
SQL>
PL/SQL procedure successfully completed.
SQL> select job,next_date,interval,what from user_jobs;
JOB NEXT_DATE INTERVAL WHAT ---------- --------- --------------- --------------- 5 30-DEC-14 SYSDATE+1/24 detach_pro
PS:感谢群里的峰哥和顺子哥给予的帮助，尤其是峰哥，花了不少时间帮我测试哦。