使用pv协助备份数据库

1.1.   安装和帮助

PV 全命为Pipe Viewer，利用它我们可以查看到命令执行的进度。

# wgethttp://www.ivarch.com/programs/sources/pv-1.5.3.tar.bz2

# tar xjfpv-1.1.4.tar.bz2

# cdpv-1.1.4

#./configure

# make&& make install

例：需要将/home/opt 目录下打包文件名称为[email protected]

# tar -p -cf - /home/opt | pv --size `du -sk /home/opt | cut -f 1`k | gzip>/home/[email protected]`date +%y-%m-%d`.tar.gz

[[email protected]]# pv --help

Usage: pv[OPTION] [FILE]...

ConcatenateFILE(s), or standard input, to standard output,

withmonitoring.

-p, --progress           show progress bar

-t, --timer              show elapsed time

-e, --eta                show estimated time of arrival(completion)

-r, --rate               show data transfer rate counter

-a, --average-rate       show data transfer average rate counter

-b, --bytes              show number of bytes transferred

-T, --buffer-percent     show percentage of transfer buffer in use

-A, --last-written NUM   show NUM bytes last written

-F, --format FORMAT      set output format to FORMAT

-n, --numeric            output percentages, not visualinformation

-q, --quiet              do not output any transferinformation at all

-W, --wait               display nothing until first bytetransferred

-s, --size SIZE          set estimated data size to SIZE bytes

-l, --line-mode          count lines instead of bytes

-0, --null               lines are null-terminated

-i, --interval SEC       update every SEC seconds

-w, --width WIDTH        assume terminal is WIDTH characters wide

-H, --height HEIGHT      assume terminal is HEIGHT rows high

-N, --name NAME          prefix visual information with NAME

-f, --force              output even if standard error isnot a terminal

-c, --cursor             use cursor positioning escapesequences

-L, --rate-limit RATE    limit transfer to RATE bytes per second

-B, --buffer-size BYTES  use a buffer size of BYTES

-C, --no-splice          never use splice(), always useread/write

-E, --skip-errors        skip read errors in input

-S, --stop-at-size       stop after --size bytes have beentransferred

-R, --remote PID         update settings of process PID

-P, --pidfile FILE       save process ID in FILE

-d, --watchfd PID[:FD]   watch file FD opened by process PID

-h, --help               show this help and exit

-V, --version            show version information and exit

1.2.   协助备份数据库

[[email protected]_tools]# mysqldump -uroot -p123456 --single-transaction --databases accounts |pv -q -L 10m |gzip>accounts.gzip

Warning:Using a password on the command line interface can be insecure.

[[email protected]_tools]# gunzip -fc accounts.gzip |mysql -uroot -p accounts

Enterpassword:

-- pv在这里做限流左右