MariaDB [hellodb]> SELECT * FROM scores;
+----+-------+----------+-------+
| ID | StuID | CourseID | Score |
+----+-------+----------+-------+
| 1 | 1 | 2 | 77 |
| 2 | 1 | 6 | 93 |
| 3 | 2 | 2 | 47 |
| 4 | 2 | 5 | 97 |
| 5 | 3 | 2 | 88 |
| 6 | 3 | 6 | 75 |
| 7 | 4 | 5 | 71 |
| 8 | 4 | 2 | 89 |
| 9 | 5 | 1 | 39 |
| 10 | 5 | 7 | 63 |
| 11 | 6 | 1 | 96 |
| 12 | 7 | 1 | 86 |
| 13 | 7 | 7 | 83 |
| 14 | 8 | 4 | 57 |
| 15 | 8 | 3 | 93 |
+----+-------+----------+-------+
15 rows
in
set
(0.00 sec)
MariaDB [hellodb]> DELETE FROM scores WHERE ID>10 AND ID<=14;
Query OK, 4 rows affected (0.08 sec)
MariaDB [hellodb]> SELECT * FROM hellodb.scores;
+----+-------+----------+-------+
| ID | StuID | CourseID | Score |
+----+-------+----------+-------+
| 1 | 1 | 2 | 77 |
| 2 | 1 | 6 | 93 |
| 3 | 2 | 2 | 47 |
| 4 | 2 | 5 | 97 |
| 5 | 3 | 2 | 88 |
| 6 | 3 | 6 | 75 |
| 7 | 4 | 5 | 71 |
| 8 | 4 | 2 | 89 |
| 9 | 5 | 1 | 39 |
| 10 | 5 | 7 | 63 |
| 15 | 8 | 3 | 93 |
+----+-------+----------+-------+
11 rows
in
set
(0.00 sec)
/* 这里把二进制日志关掉插入些数据,下面会把二进制再打开,再插入些数据 */
MariaDB [hellodb]> SET sql_log_bin=0;
Query OK, 0 rows affected (0.00 sec)
MariaDB [hellodb]> SHOW VARIABLES LIKE
'%SQL_LOG_BIN%'
;
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| sql_log_bin | OFF |
+---------------+-------+
1 row
in
set
(0.00 sec)
MariaDB [hellodb]> SHOW MASTER STATUS;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000006 | 495 | | |
+------------------+----------+--------------+------------------+
MariaDB [hellodb]> INSERT INTO scores (StuID,CourseID,Score) VALUES (3,3,3),(4,4,4),(5,5,5);
Query OK, 3 rows affected (0.06 sec)
Records: 3 Duplicates: 0 Warnings: 0
/* 这里顺带看下二进制日志位置在495 */
MariaDB [hellodb]> SHOW MASTER STATUS;
+------------------+----------+--------------+------------------+
| File | Position | Binlog_Do_DB | Binlog_Ignore_DB |
+------------------+----------+--------------+------------------+
| mysql-bin.000006 | 495 | | |
+------------------+----------+--------------+------------------+
1 row
in
set
(0.00 sec)
MariaDB [hellodb]> SET sql_log_bin=1;
Query OK, 0 rows affected (0.00 sec)
MariaDB [hellodb]> SHOW VARIABLES LIKE
'sql_log_bin'
;
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| sql_log_bin | ON |
+---------------+-------+
1 row
in
set
(0.00 sec)
/* 把binlog打开后再插入一些数据 */
MariaDB [hellodb]> INSERT INTO scores (StuID,CourseID,Score) VALUES (10,11,12),(13,14,15);
Query OK, 2 rows affected (0.00 sec)
Records: 2 Duplicates: 0 Warnings: 0
/* LAST_INSERT_ID()这个函数可以查看有AUTO_INCREMENT属性的字段上次长到哪里了 */
MariaDB [hellodb]> SELECT LAST_INSERT_ID();
+------------------+
| LAST_INSERT_ID() |
+------------------+
| 19 |
+------------------+
1 row
in
set
(0.00 sec)
/* 仔细看一下下面的查询结果我们新插入的数据并没有按顺序在ID=15后面,而是依次被存入到之前删除的行释放后的存储空间里了 */
MariaDB [hellodb]> SELECT * FROM scores;
+----+-------+----------+-------+
| ID | StuID | CourseID | Score |
+----+-------+----------+-------+
| 1 | 1 | 2 | 77 |
| 2 | 1 | 6 | 93 |
| 3 | 2 | 2 | 47 |
| 4 | 2 | 5 | 97 |
| 5 | 3 | 2 | 88 |
| 6 | 3 | 6 | 75 |
| 7 | 4 | 5 | 71 |
| 8 | 4 | 2 | 89 |
| 9 | 5 | 1 | 39 |
| 10 | 5 | 7 | 63 |
| 19 | 10 | 11 | 12 |
| 18 | 5 | 5 | 5 |
| 17 | 4 | 4 | 4 |
| 16 | 3 | 3 | 3 |
| 15 | 8 | 3 | 93 |
| 20 | 13 | 14 | 15 |
+----+-------+----------+-------+
16 rows
in
set
(0.00 sec)
/* 删除hellodb数据库,模拟数据库崩溃 */
MariaDB [(none)]> DROP DATABASE hellodb;
Query OK, 9 rows affected (0.47 sec)
MariaDB [(none)]> SHOW DATABASES;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mydb |
| mysql |
| performance_schema |
|
test
|
+--------------------+
5 rows
in
set
(0.01 sec)
/* 因为全备时用了--flush-logs选项,所以只要备份最后一个二进制日志就可以了 */
cp
/mydata/data/mysql-bin
.000006
/backup/
[root@node1 data]
# cd /backup/
/* 因为执行了DROP DATABASE语句,所以恢复时把这个语句之前的binlog应用就可以了 */
[root@node1 backup]
# mysqlbinlog 'mysql-bin.000006' | grep 'DROP DATABASE' -B 15
#140729 13:59:59 server id 1 end_log_pos 594 Intvar
SET INSERT_ID=19/*!*/;
# at 594
#140729 13:59:59 server id 1 end_log_pos 730 Query thread_id=25 exec_time=0 error_code=0
SET TIMESTAMP=1406613599/*!*/;
INSERT INTO scores (StuID,CourseID,Score) VALUES (10,11,12),(13,14,15)
/*!*/;
# at 730
#140729 13:59:59 server id 1 end_log_pos 802 Query thread_id=25 exec_time=0 error_code=0
SET TIMESTAMP=1406613599/*!*/;
COMMIT
/*!*/;
# at 802
#140729 14:15:57 server id 1 end_log_pos 889 Query thread_id=26 exec_time=0 error_code=0
SET TIMESTAMP=1406614557/*!*/;
DROP DATABASE hellodb
/* 找到位置后把需要的日志导出来 */
[root@node1 backup]
# mysqlbinlog 'mysql-bin.0000061' --stop-position=730 > /backup/inr-001.sql
/* 恢复完全备份,这里直接是全库备份了,当然也可以根据需要对单库单表备份 */
[root@node1 backup]
# mysql < /backup/full_db_2014-07-29.sql
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