Oracle案例:利用存储过程进行表数据分离
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;

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

This article explores optimizing MySQL memory usage in Docker. It discusses monitoring techniques (Docker stats, Performance Schema, external tools) and configuration strategies. These include Docker memory limits, swapping, and cgroups, alongside

This article addresses MySQL's "unable to open shared library" error. The issue stems from MySQL's inability to locate necessary shared libraries (.so/.dll files). Solutions involve verifying library installation via the system's package m

The article discusses using MySQL's ALTER TABLE statement to modify tables, including adding/dropping columns, renaming tables/columns, and changing column data types.

This article compares installing MySQL on Linux directly versus using Podman containers, with/without phpMyAdmin. It details installation steps for each method, emphasizing Podman's advantages in isolation, portability, and reproducibility, but also

This article provides a comprehensive overview of SQLite, a self-contained, serverless relational database. It details SQLite's advantages (simplicity, portability, ease of use) and disadvantages (concurrency limitations, scalability challenges). C

This guide demonstrates installing and managing multiple MySQL versions on macOS using Homebrew. It emphasizes using Homebrew to isolate installations, preventing conflicts. The article details installation, starting/stopping services, and best pra

Article discusses configuring SSL/TLS encryption for MySQL, including certificate generation and verification. Main issue is using self-signed certificates' security implications.[Character count: 159]

Article discusses popular MySQL GUI tools like MySQL Workbench and phpMyAdmin, comparing their features and suitability for beginners and advanced users.[159 characters]
