Using Git to track mysql schema - some questions

Question

If this is recommended ?

Can I ask some git command examples about how to track versions of mysql schema?

Should we use another repository other then the on

Answer 1

IMO the best approach is described here: http://viget.com/extend/backup-your-database-in-git. For your convenience I repeat the most important pieces here.

The trick is to use mysqldump --skip-extended-insert, which creates dumps that can be better tracked/diffed by git.

There are also some hints regarding the best repository configuration in order to reduce disk size. Copied from here:

• core.compression = 9 : Flag for gzip to specify the compression level for blobs and packs. Level 1 is fast with larger file sizes, level 9 takes more time but results in better compression.
• repack.usedeltabaseoffset = true : Defaults to false for compatibility reasons, but is supported with Git >=1.4.4.
• pack.windowMemory = 100m : (Re)packing objects may consume lots of memory. To prevent all your resources go down the drain it's useful to put some limits on that. There is also pack.deltaCacheSize.
• pack.window = 15 : Defaults to 10. With a higher value, Git tries harder to find similar blobs.
• gc.auto = 1000 : Defaults to 6700. As indicated in the article it is recommended to run git gc every once in a while. Personally I run git gc --auto everyday, so only pack things when there's enough garbage. git gc --auto normally only triggers the packing mechanism when there are 6700 loose objects around. This flag lowers this amount.
• gc.autopacklimit = 10: Defaults to 50. Every time you run git gc, a new pack is generated of the loose objects. Over time you get too many packs which waste space. It is a good idea to combine all packs once in a while into a single pack, so all objects can be combined and deltified. By default git gc does this when there are 50 packs around. But for this situation a lower number may be better.

Old versions can be pruned via:

git rebase --onto master~8 master~7

(copied from here)