+1 Also as an example the 'inbound-use-callid-as-uuid' parameter I mentioned before is a Sofia profile parameter that uses the Call-ID header value from the INVITE sent by the caller as the UUID for the channel. That could be useful for example in matching up channels against SIP traces as you only need to store 1 ID not 2. I frequently see ones for example of $UUID@$ SERVER.COM - far longer than 128bits, and using characters other than 0-9A-F so that it can't be folded into bits. In this case a CHAR column becomes most flexible and the BIGINT column gives you the speed advantage of the BINARY. -Steve On 17 February 2013 22:39, Seven Du <dujinfang@gmail.com> wrote:
you can use any arbitrary string as uuid, say
originate {origination_uuid=my-uuid-that-is-not-128-bit}user/1000 ….
On Monday, February 18, 2013 at 6:13 AM, Cal Leeming [Simplicity Media Ltd] wrote:
Thanks for the feedback Steve,
In ref to auto inc, actually, I have! :) In the code on the blog, it shows that the tables uses a BIGINT auto increment for each row, and the performance was still good. However, using this approach introduces an unnecessary JOIN and uses more index and table space - unless I've missed something?
Could you elaborate more on the UUIDs that may not be 128-bit? My google-fu failed me :/
Cal
On Sun, Feb 17, 2013 at 9:11 PM, Steven Ayre <steveayre@gmail.com> wrote:
Another possibility you haven't looked at is having a table of UUIDs with a BIGINT auto_increment PK and using that as keys in other takes with a foreign key relationship (whether defined or implied). That would give you a smaller integer (hence faster select/insert/join/etc) that's still guaranteed to be unique. Though the auto_increment INSERT could then become a bottleneck (hint run a recent 5.5/5.6 MySQL version at the very least since that bottleneck while still present was very much reduced).
-Steve
On 17 February 2013 20:55, Cal Leeming [Simplicity Media Ltd] < cal.leeming@simplicitymedialtd.co.uk> wrote:
Hi all,
Just spent a little while comparing the performance of heavy INSERT/SELECT performance against UUID fields in a MySQL database.
Full performance breakdown and write up can be found here; http://blog.simplicitymedialtd.co.uk/?p=437
So far, the best option seems to be storing the UUID as a BINARY(16) - anyone have any thoughts on this?
Thanks
Cal
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