达梦V8累积增量备份和差异增量备份
2024-06-04 02:33:48
累积增量备份和差异增量备份差异
BACKUP DATABASE INCREMENT CUMULATIVE(累积)
累积增量备份的基备份，只是一个完全的备份集，
简单理解：从数据库全备起，到当前时刻所有差异数据累积起来，进行备份；
BACKUP DATABASE INCREMENT
差异增量备份的基备份，即可以是一个完全的备份集，也可以是一个累积增量备份集，还可以是一个差异增量备份集
简单理解：从任何备份起，与当前时刻数据差异，进行备份；
每周备份建议
建议1：每天业务低峰例如晚上23点以后，发起数据库全备，备份保留假如14天，
好处是每天都有全备份，恢复简单，消耗时间短，
缺点备份占空间，备份消耗资源多；
建议2：每天业务低峰例如晚上23点以后，
周日数据库全备，
周1差异增量备份，
周2差异增量备份，
周3累积增量备份，
周4差异增量备份，
周5累积增量备份，
周6差异增量备份，
备份保留假如14天，
好处占空间较小，备份消耗资源少，
缺点需要恢复的时候，需要读取2次备份集，恢复时间长
一个星期中任何某天恢复需要读取备份集的次数，最多不超过2次
模拟测试过程
模拟测试过程
Last login: Thu May 19 09:52:02 2022 from 10.0.0.1
[dmdba@dmdb1 ~]$ disql
disql V8
username:
password:Server[LOCALHOST:5236]:mode is normal, state is open
login used time : 1.783(ms)
SQL>
SQL> create tablespace tbuser datafile '/dm8/mdbms/data/OA/tbuser01.dbf' size 4096;
executed successfully
used time: 20.350(ms). Execute id is 703.
SQL> create user testu identified by "abcdef123456" default tablespace tbuser;
executed successfully
used time: 4.547(ms). Execute id is 704.
SQL> grant dba to testu;
executed successfully
used time: 3.511(ms). Execute id is 705.
SQL> conn testu/abcdef123456Server[LOCALHOST:5236]:mode is normal, state is open
login used time : 1.540(ms)
SQL>
SQL>
SQL>
SQL> create table bookinfo(bookid int,bookcontent clob,bookcover blob);
executed successfully
used time: 8.444(ms). Execute id is 800.
SQL> insert into bookinfo values (1,null,null);
affect rows 1used time: 0.732(ms). Execute id is 801.
SQL> insert into bookinfo values (2,null,null);
affect rows 1used time: 0.643(ms). Execute id is 802.
SQL> insert into bookinfo values (3,null,null);
affect rows 1used time: 0.458(ms). Execute id is 803.
SQL> commit;
executed successfully
used time: 0.730(ms). Execute id is 804.
SQL>
SQL>
SQL> BACKUP DATABASE FULL BACKUPSET '/dm8/backup/db_full_bak_01';
executed successfully
used time: 862.988(ms). Execute id is 805.
SQL>
SQL>
SQL>
SQL>
SQL>
SQL>
SQL> declare
2
3 l_bfile bfile;
4
5 l_bfile2 bfile;
6
7 l_blob blob;
8
9 l_clob clob;
10
11 begin
12
13 update bookinfo set bookcover=empty_blob() where bookid=1;
14
15 update bookinfo set bookcontent=empty_clob() where bookid=1;
16
17 select bookcover into l_blob from bookinfo where bookid=1;
18
19 l_bfile:=bfilename('BOOKFILES','dexpdimp.png');
20
21 dbms_lob.open(l_bfile,dbms_lob.file_readonly);
22
23 dbms_lob.loadfromfile(l_blob,l_bfile,dbms_lob.getlength(l_bfile));
24
25 dbms_lob.close(l_bfile);
26
27 select bookcontent into l_clob from bookinfo where bookid=1;
28
29 l_bfile2:=bfilename('BOOKFILES','dexpdimp.pdf');
30
31 dbms_lob.open(l_bfile2,dbms_lob.file_readonly);
32
33 dbms_lob.LOADCLOBFROMFILE(l_clob,l_bfile2,dbms_lob.getlength(l_bfile2),1,1,0,1,1);
34
35 dbms_lob.close(l_bfile2);
36
37 commit;
38
39 end;
40 /
DMSQL executed successfully
used time: 00:00:17.267. Execute id is 806.
SQL>
SQL>
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT WITH BACKUPDIR '/dm8/backup' to INCR_02 backupset '/dm8/backup/db_incr_bak_02';
executed successfully
used time: 00:00:01.664. Execute id is 807.
SQL>
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT WITH BACKUPDIR '/dm8/backup' to INCR_02_01 backupset '/dm8/backup/db_incr_bak_02_01';
executed successfully
used time: 00:00:03.057. Execute id is 809.
SQL>
SQL>
SQL>
SQL>
SQL>
SQL>
SQL>
SQL> declare
2
3 l_bfile bfile;
4
5 l_bfile2 bfile;
6
7 l_blob blob;
8
9 l_clob clob;
10
11 begin
12
13 update bookinfo set bookcover=empty_blob() where bookid=2;
14
15 update bookinfo set bookcontent=empty_clob() where bookid=2;
16
17 select bookcover into l_blob from bookinfo where bookid=2;
18
19 l_bfile:=bfilename('BOOKFILES','backuprestore.png');
20
21 dbms_lob.open(l_bfile,dbms_lob.file_readonly);
22
23 dbms_lob.loadfromfile(l_blob,l_bfile,dbms_lob.getlength(l_bfile));
24
25 dbms_lob.close(l_bfile);
26
27 select bookcontent into l_clob from bookinfo where bookid=2;
28
29 l_bfile2:=bfilename('BOOKFILES','backuprestore.pdf');
30
31 dbms_lob.open(l_bfile2,dbms_lob.file_readonly);
32
33 dbms_lob.LOADCLOBFROMFILE(l_clob,l_bfile2,dbms_lob.getlength(l_bfile2),1,1,0,1,1);
34
35 dbms_lob.close(l_bfile2);
36
37 commit;
38
39 end;
40 /
DMSQL executed successfully
used time: 00:01:16.403. Execute id is 810.
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT WITH BACKUPDIR '/dm8/backup' to INCR_03 backupset '/dm8/backup/db_incr_bak_03';
executed successfully
used time: 00:00:17.055. Execute id is 811.
SQL>
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT WITH BACKUPDIR '/dm8/backup' to INCR_03_01 backupset '/dm8/backup/db_incr_bak_03_01';
executed successfully
used time: 00:00:04.856. Execute id is 812.
SQL>
SQL>
SQL>
SQL>
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT CUMULATIVE WITH BACKUPDIR '/dm8/backup' to CUMU_04 backupset '/dm8/backup/db_cumu_bak_04';
executed successfully
used time: 00:00:19.950. Execute id is 813.
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT CUMULATIVE WITH BACKUPDIR '/dm8/backup' to CUMU_04_01 backupset '/dm8/backup/db_cumu_bak_04_01';
executed successfully
used time: 00:00:11.316. Execute id is 814.
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT WITH BACKUPDIR '/dm8/backup' to INCR_03_02 backupset '/dm8/backup/db_incr_bak_03_02';
executed successfully
used time: 00:00:03.004. Execute id is 815.
SQL>
SQL>
SQL>
SQL>
SQL>
SQL> declare
2
3 l_bfile bfile;
4
5 l_bfile2 bfile;
6
7 l_blob blob;
8
9 l_clob clob;
10
11 begin
12
13 update bookinfo set bookcover=empty_blob() where bookid=3;
14
15 update bookinfo set bookcontent=empty_clob() where bookid=3;
16
17 select bookcover into l_blob from bookinfo where bookid=3;
18
19 l_bfile:=bfilename('BOOKFILES','fu.png');
20
21 dbms_lob.open(l_bfile,dbms_lob.file_readonly);
22
23 dbms_lob.loadfromfile(l_blob,l_bfile,dbms_lob.getlength(l_bfile));
24
25 dbms_lob.close(l_bfile);
26
27 select bookcontent into l_clob from bookinfo where bookid=3;
28
29 l_bfile2:=bfilename('BOOKFILES','fu.pdf');
30
31 dbms_lob.open(l_bfile2,dbms_lob.file_readonly);
32
33 dbms_lob.LOADCLOBFROMFILE(l_clob,l_bfile2,dbms_lob.getlength(l_bfile2),1,1,0,1,1);
34
35 dbms_lob.close(l_bfile2);
36
37 commit;
38
39 end;
40 /
DMSQL executed successfully
used time: 00:00:13.971. Execute id is 816.
SQL>
SQL>
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT CUMULATIVE WITH BACKUPDIR '/dm8/backup' to CUMU_05 backupset '/dm8/backup/db_cumu_bak_05';
executed successfully
used time: 00:00:03.727. Execute id is 817.
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT CUMULATIVE WITH BACKUPDIR '/dm8/backup' to CUMU_05_01 backupset '/dm8/backup/db_cumu_bak_05_01';executed successfully
used time: 00:00:03.507. Execute id is 818.
SQL>
SQL>
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT WITH BACKUPDIR '/dm8/backup' to INCR_06 backupset '/dm8/backup/db_incr_bak_06';
executed successfully
used time: 00:00:03.405. Execute id is 819.
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT WITH BACKUPDIR '/dm8/backup' to INCR_06_01 backupset '/dm8/backup/db_incr_bak_06_01';
executed successfully
used time: 00:00:01.184. Execute id is 820.
SQL>
SQL>
SQL>
SQL>
SQL> BACKUP DATABASE FULL BACKUPSET '/dm8/backup/db_full_bak_07';
executed successfully
used time: 00:00:03.516. Execute id is 821.
SQL>
SQL> BACKUP DATABASE INCREMENT CUMULATIVE WITH BACKUPDIR '/dm8/backup' to CUMU_08 backupset '/dm8/backup/db_cumu_bak_08';
executed successfully
used time: 00:00:02.948. Execute id is 822.
SQL>
SQL>
SQL> BACKUP DATABASE INCREMENT CUMULATIVE WITH BACKUPDIR '/dm8/backup2' to CUMU_09 backupset '/dm8/backup/db_cumu_bak_09';
executed successfully
used time: 00:00:01.254. Execute id is 823.
SQL>
备份集大小
累积增量备份的起始点为上一次数据库全备、累积增量备份、差异增量备份；
差异增量备份的起始点为上一次数据库全备；
[dmdba@dmdb1 backup]$ du -sh *
24M db_full_bak_01
528M db_incr_bak_02
119M db_incr_bak_02_01
797M db_incr_bak_03
119M db_incr_bak_03_01
832K db_incr_bak_03_02
1.3G db_cumu_bak_04
1.3G db_cumu_bak_04_01
1.7G db_cumu_bak_05
1.7G db_cumu_bak_05_01
119M db_incr_bak_06
1020K db_incr_bak_06_01
1.7G db_full_bak_07
1004K db_cumu_bak_08
1020K db_cumu_bak_09 <==额外补加
[dmdba@dmdb1 backup]$
达梦在线服务平台：https://eco.dameng.com
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