I will partially respond to your questions:
-skip-lock-tables, avoids locking the table when dumping them.
This means if you are on production servers, the dump won't freeze/slow
your activity, however the dump may be incomplete or not reflecting an atomic
state.
-single-transaction
This as far as I know is only the way the INSERT commands will be
written to the dump. With multiple inserts or a single one.
As for mariabackup, I don't think the prepare command needs access to the
actual source folder, as everything has been copied. The prepare seems to
replace the last bin log, but you might want to seek for someone else
confirmation.
FWIW, I stopped using mariabackup for backup (using it to start replication
only) because restoring a single DB (we have 300+) or a single table seems
highly cumbersome because you'll have to restore the entire backup to a working
MariaDB server, and then dump/import the tables/DB you need onto your
production server. Had to do it once, never again. So now I'm using plain
mysqldump for which I easily control the output and how I'll be able to
retrieve a DB or single table!
-----Message d'origine-----
De : Maria-discuss
<maria-discuss-bounces+cedric.counotte=1check....@lists.launchpad.net> De la
part de jk...@w3.org
Envoyé : mardi 2 août 2022 12:34
À : maria-discuss@lists.launchpad.net
Objet : [Maria-discuss] Some questions about mariadb-dump and mariabackup
Hi! Sorry to bother you about this but I haven't found the answers in the doc.
** mariadb-dump
Could you tell me what is the difference of calling mariadb-dump on innodb
tables using --skip-lock-tables --single-transaction?
>From what I read these seem to be time / performace optimizations for doing
>innodb tables dumps but if we omit them, we would get the same data dumped,
>even it takes longer.
Could you confirm this?
** mariabackup
We have a setup that stores the binary logs under /var/log/mysql (set up with
the log_bin configuration option) and the databases themselves under
/var/lib/mysql
Suppose I call mariabackup to make a backup of the database as follows (some
options obmitted):
mariabackup --backup --target-dir=my_backup_dir
Could you tell me if calling
mariabackup --prepare --target-dir=my_backup_dir
needs access to the binary logs stored under /var/log/mysql or if mariabackup
made a copy of all that it needs in my_backup_dir?
** mariabackup and incremental backups
This is basically the same question as the above. If i'm making incremental
backups as follows (some options obmitted):
mariabackup --backup \
--target-dir=my_backup_dir/inc1
--incremental-basedir=full_backup_dir
When I do the prepare for the incremental backups, does mariabackup need access
to the /var/log/mysql bin logs or do the full + each incremental backup dirs
has all the info needed to do the prepare?
mariabackup --prepare \
--target-dir=my_backup_dir/inc1
--incremental-basedir=full_backup_dir
Many thanks in advance!
--josé
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