HANA备份文件说明

1. 路径

   

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   数据备份路径：/usr/sap/SID/HDBnr/backup/data

   日志备份路径：/usr/sap/SID/HDBnr/backup/log

   如果想更改路径，可以studio的backup console中更改

   也可以在global.ini配置文件中更改$(DIR_INSTANCE)/../SYS/global/hdb/custom/config

2. Catalog

   与oracle的catalog作用类似，记录所备份的内容

   SP12的catalog文件和log备份文件同在一个目录，格式：log_backup_0_0_0_0.

   详细版本说明可参考如下note

   1812980 - Changes to the backup catalog as of Revision 4

   其中有一句话需要注意：

   When an SAP HANA database is recovered, the system uses the file log_backup_0_0_0_0 that has the highest version ID in the suffix. The system uses the information contained in this file to determine the other backups that are required for the recovery.

   意思是在恢复数据库的时候，将从最新的catalog文件里面获取所需要使用备份文件的信息。

3. 数据备份文件

   格式：_databackup__

   Prefix一般是日期+时间，用于区别每一次的备份，因为后面的命名相同，不然将覆盖上一次备份

   databackup是系统自动增加

   Volume ID与service对应，确定当前备份文件属于那个服务

   Index当前是1

   比如下面的

2016-11-25.complete_databackup_0_1  
2016-11-25.complete_databackup_1_1  
2016-11-25.complete_databackup_2_1  
2016-11-25.complete_databackup_3_1

    2016-11-25.complete_databackup_N_1代表是哪个服务的备份呢？

    0/1是nameserver，2是xsengine，3是indexserver

    可以通过hdbbackupcheck -v backupfilename来检查，同时backupid也会显显示在结果中

    具体可查看note 1705945 - Determining required restoration files

    4.日志备份文件

    默认是15分钟，即900秒备份一次，可以自行更改

    备份一次也会相应产生一次catalog文件

    格式：log_backup___ _

    The SAP HANA database always adds the character string "log_backup_" to the file name and it therefore refers to a log backup.

    The identifies the database service to which the backup belongs.---与数据备份文件一样意思

    The is currently always 0.

    The is the redo log position of the first or oldest log entry that is contained in     the log.

    The corresponds to the first redo log position of the next log backup that follows.

    如下：

-rw-r----- 1 heqadm sapsys    12288 Nov 25 10:37 log_backup_0_0_0_0.1480041459523
-rw-r----- 1 heqadm sapsys    61440 Nov 25 10:52 log_backup_2_0_11928192_11929024.1480042320558
-rw-r----- 1 heqadm sapsys    86016 Nov 25 10:52 log_backup_1_0_1686400_1687616.1480042320555
-rw-r----- 1 heqadm sapsys    16384 Nov 25 10:52 log_backup_0_0_0_0.1480042322962
-rw-r----- 1 heqadm sapsys  1069056 Nov 25 10:52 log_backup_3_0_4943550784_4943567360.1480042320564
-rw-r----- 1 heqadm sapsys  1007616 Nov 25 10:52 log_backup_1_0_1687616_1703232.1480042321464
-rw-r----- 1 heqadm sapsys 22958080 Nov 25 10:52 log_backup_3_0_4943567360_4943925952.1480042322229
-rw-r----- 1 heqadm sapsys    16384 Nov 25 10:52 log_backup_0_0_0_0.1480042323923
-rw-r----- 1 heqadm sapsys    16384 Nov 25 10:52 log_backup_0_0_0_0.1480042325885

    最后一个字符串是backupID

    也可以通过hdbbackupcheck -v logbackupname来检查

    具体可查看note 1705945 - Determining required restoration files

    追加说明

    1852242 - Confusion about file-based backup catalog naming

    1. From revision 45 until 49: log_backup_0_0_0_0.

    2. From revision 50 until 51: log_backup_0_0_0_0.

    3. From revision 52 until 53: log_backup_0_0_0_0.

    4. From revision 54: log_backup_0_0_0_0.

参考：https://sapbi.blog/2013/03/20/sap-hana-backup-notes/