Terminal command: sudo mysqldump -defaults-file=/var/mysqldump/conf.cfg test_db | gzip > /var/tmp/backup.gzĬontents of conf.cfg: would this work on Ubuntu 18.04, but fails indefinitely while consuming CPU resources on 20.04? Is there a settings change on 20. Output of mysqldump -V Ubuntu 18.04: mysqldump Ver 10.13 Distrib 5.7.36, for Linux (x86_64) f formatfile : Specify a file that contains one or more newline separated format. e formatstring : Specify a format string to be used for displaying data. Output of mysqldump -V Ubuntu 20.04: mysqldump Ver 8.0.27-0ubuntu0.20.04.1 for Linux on x86_64 ((Ubuntu)) Display the input offset in hexadecimal, followed by eight space-separated, five column, zero-filled, two-byte units of input data, in unsigned decimal, per line.
Mysqldump zero byte file install#
Sudo apt-get install -y -no-install-recommends mysql-client
Mysqldump zero byte file update#
Mysqldump is installed using the following command: sudo apt-get update I am completely stumped on why this is not working on 20.04. String are usually disallowed at the user level if they don't make sense: a file name is a string, and most file systems do not allow an empty string as a file name internally, when creating file names from fragments, the program may well have an empty string as one of the fragments.I am using identical configs on Ubuntu 20.04 as I was previously on 18.04 however, on 20.04 the CPU shoots up to 50% usage and the process runs indefinitely, and by indefinitely I mean it was running for over 24hr when I caught the issue. Most notably to strings, which are sequences of characters: Zero-length strings are commonplace inside of programs. In general, all of the above reasons except those related to file names apply to sequences. In the case of files, the "there is a file recorded somewhere" aspect (inode and/or file name) comes on top of the above considerations, but file systems would not do that if empty files were useless.
Mysqldump zero byte file code#
If a file contains 20 letters "A", and you remove all "A"s, then the file will become 20 bytes shorter.
Longer answer: It's defined that way because some operations are conceptually simpler: Simple answer: Because it's defined that way.