How to use percona's pt-archiver tool in mysql
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DBAs or OPS personnel often need to archive and clean data regularly. We can use percona's pt-archiver tool to complete this function, making data archiving convenient and simple.
An example of archived data:
The original table structure is:
mysql>desc test.t1;
+-------+---------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| id | int(11) | NO | PRI | NULL | |
| a | int(11) | YES | MUL | NULL | |
| b | int(11) | YES | | NULL | |
+-------+---------+------+-----+---------+-------+
3 rows in set (0.00 sec)
mysql>show create table test.t1 \G
*************************** 1. row ***************************
Table: t1
Create Table: CREATE TABLE `t1` (
`id` int(11) NOT NULL,
`a` int(11) DEFAULT NULL,
`b` int(11) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `a` (`a`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4
1 row in set (0.00 sec)
Archive to File:
# pt-archiver --source h=192.168.140.51,u=root,p=123456,P=3306,D=test,t=t1 --file '/tmp/test.txt' --progress 500 --no-delete --statistics --where '1=1' --txn-size 1000 --no-check-charset
TIME ELAPSED COUNT
2019-06-19T16:14:48 0 0
2019-06-19T16:14:48 0 500
2019-06-19T16:14:49 0 1000
2019-06-19T16:14:49 0 1000
Started at 2019-06-19T16:14:48, ended at 2019-06-19T16:14:49
Source: D=test,P=3306,h=192.168.140.51,p=..., t=t1,u=root
SELECT 1000
INSERT 0
DELETE 0
Action Count Time Pct
select 1001 0.6883 72.33
print_file 1000 0.0149 1.57
commit 2 0.0004 0.04
other 0 0.2480 26.06
Note:
Tables for pt-archiver operations must have a primary key.
--where '1=1' condition is to export all data, if you want to export some data, you can set where condition, for example--where 'b>500'
--no-check-charset Set not to check character set, otherwise an error will be reported:
Character set mismatch: --source DSN uses latin1, table uses utf8mb4. You can disable this check by specifying --no-check-charset.
Common parameters are:
Number of rows to fetch and archive per statement.
--txn-size 1000 Set 1000 rows to commit once per transaction, Number of rows per transaction.
--where 'id
