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Cassandra for Oracle DBA’s Part 17: Backup & Recovery

Backup in Cassandra maintain at node level , so any backup that taken in the one node does not contain other nodes data, so you must take backup of each node, cassandra maintains backups as snapshots means an entire sstables at disk level copied to a different folder with snapshot id as like below.

root@wash-i-16ca26c8-prod ~/.ccm/repository/4.5.2/resources/cassandra/bin $ ccm node1 nodetool snapshot PortfolioDemo

Requested creating snapshot for: PortfolioDemo

Snapshot directory: 1468236726789

root@wash-i-16ca26c8-prod ~/.ccm/geek_cluster/node2/data0/PortfolioDemo/Portfolios/snapshots $ ls -ltr

total 0

root@wash-i-16ca

root@wash-i-16ca26c8-prod ~/.ccm/geek_cluster/node1/data0/PortfolioDemo/Portfolios/snapshots/1468236726789 $ ls -ltr

total 1072

-rw-r--r-- 2 root root  13456 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-Filter.db

-rw-r--r-- 2 root root 220000 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-Index.db

-rw-r--r-- 2 root root 576097 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-Data.db

-rw-r--r-- 2 root root    243 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-CompressionInfo.db

-rw-r--r-- 2 root root   4406 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-Statistics.db

-rw-r--r-- 2 root root     79 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-TOC.txt

-rw-r--r-- 2 root root   1652 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-Summary.db

-rw-r--r-- 2 root root   3696 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-Filter.db

-rw-r--r-- 2 root root  64548 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-Index.db

-rw-r--r-- 2 root root 169778 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-Data.db

-rw-r--r-- 2 root root     99 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-CompressionInfo.db

-rw-r--r-- 2 root root   4390 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-Statistics.db

-rw-r--r-- 2 root root     79 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-TOC.txt

-rw-r--r-- 2 root root    532 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-Summary.db

root@wash-i-16ca26c8-prod ~/.ccm/geek_cluster/node1/data0/PortfolioDemo/Portfolios/snapshots/1468236726789 $

 

Size of Snapshot for One SS Table

root@wash-i-16ca26c8-prod ~/.ccm/geek_cluster/node1/data0/PortfolioDemo/Portfolios/snapshots $ du -sh *

1.1M    1468236726789

Size of Data for One SS Table

root@wash-i-16ca26c8-prod ~/.ccm/geek_cluster/node1/data0/PortfolioDemo/Portfolios $ du -h

1.1M    .

root@wash-i-16ca26c8-prod ~/.ccm/geek_cluster/node1/data0/PortfolioDemo/Portfolios/snapshots $ ls -ltr

total 4

drwxr-xr-x 2 root root 4096 Jul 11 21:32 1468236726789

 

Deleting Snapshots

root@wash-i-16ca26c8-prod ~/.ccm/geek_cluster/node1/data0/PortfolioDemo/Portfolios $ ccm node1 nodetool clearsnapshot PortfolioDemo

Requested clearing snapshot for: PortfolioDemo

root@wash-i-16ca26c8-prod ~/.ccm/geek_cluster/node1/data0/PortfolioDemo/Portfolios $

root@wash-i-16ca26c8-prod ~/.ccm/geek_cluster/node1/data0/PortfolioDemo/Portfolios $ ls -ltr

total 1072

-rw-r--r-- 1 root root  13456 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-Filter.db

-rw-r--r-- 1 root root 220000 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-Index.db

-rw-r--r-- 1 root root 576097 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-Data.db

-rw-r--r-- 1 root root    243 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-CompressionInfo.db

-rw-r--r-- 1 root root   4406 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-Statistics.db

-rw-r--r-- 1 root root     79 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-TOC.txt

-rw-r--r-- 1 root root   1652 Jul 11 12:02 PortfolioDemo-Portfolios-jb-5-Summary.db

-rw-r--r-- 1 root root   3696 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-Filter.db

-rw-r--r-- 1 root root  64548 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-Index.db

-rw-r--r-- 1 root root 169778 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-Data.db

-rw-r--r-- 1 root root     99 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-CompressionInfo.db

-rw-r--r-- 1 root root   4390 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-Statistics.db

-rw-r--r-- 1 root root     79 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-TOC.txt

-rw-r--r-- 1 root root    532 Jul 11 19:58 PortfolioDemo-Portfolios-jb-6-Summary.db

root@wash-i-16ca26c8-prod ~/.ccm/geek_cluster/node1/data0/PortfolioDemo/Portfolios $

root@wash-i-16ca26c8-prod ~/.ccm/geek_cluster/node1/data0/PortfolioDemo/Portfolios $ ccm node1 nodetool clearsnapshot PortfolioDemo -t 1468236726789

 

Enabling Incremental Snapshots

root@wash-i-16ca26c8-prod ~/.ccm/repository/4.5.2/resources/cassandra/conf $ grep increment cassandra.yaml

incremental_backups: false

Change it to true.

-Thanks

Geek DBA

 

October 1st, 2016 | Tags: , , , | Category: 12c Database, Cassandra

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