Comments for Jeremy Cole http://blog.jcole.us Geek, electronics nerd, database nerd, father of three. Thu, 16 May 2013 12:49:09 +0000 hourly 1 http://wordpress.com/ Comment on InnoDB Tidbit: The doublewrite buffer wastes 32 pages (512 KiB) by [MySQL 5.6] double write buffer的几个关键函数 | Simple Life http://blog.jcole.us/2013/05/05/innodb-tidbit-the-doublewrite-buffer-wastes-32-pages-512-kib/#comment-2654 Thu, 16 May 2013 12:49:09 +0000 http://blog.jcole.us/?p=1088#comment-2654 […] 另外jeremy cole 提到dblwr buffer的一个有趣的现象，传送门：http://blog.jcole.us/2013/05/05/innodb-tidbit-the-doublewrite-buffer-wastes-32-pages-512-kib/ […]

]]> Comment on How does InnoDB behave without a Primary Key? by Suresh Kuna http://blog.jcole.us/2013/05/02/how-does-innodb-behave-without-a-primary-key/#comment-2649 Wed, 15 May 2013 15:25:31 +0000 http://blog.jcole.us/?p=1060#comment-2649 Nice, good to know the internal things of cluster index, Thank Jeremy C

]]> Comment on How does InnoDB behave without a Primary Key? by Justin Swanhart http://blog.jcole.us/2013/05/02/how-does-innodb-behave-without-a-primary-key/#comment-2645 Sun, 12 May 2013 06:56:41 +0000 http://blog.jcole.us/?p=1060#comment-2645 Because a mutex is held while increasing the key instead of using atomic increment. The mutex has to be held by DDL operations and can be held for a long time (relatively) during table drop operations. So a drop of table X could result in a mutex wait during insert on table Y.

]]> Comment on How does InnoDB behave without a Primary Key? by Cream http://blog.jcole.us/2013/05/02/how-does-innodb-behave-without-a-primary-key/#comment-2644 Sun, 12 May 2013 02:36:27 +0000 http://blog.jcole.us/?p=1060#comment-2644 Why we could experience random insert during operations like dropping (unrelated) tables? The ROW_ID is increases monotonically, so is there any situation that the next ROW_ID less than current max ROW_ID?

]]> Comment on On efficiently geo-referencing IPs with MaxMind GeoIP and MySQL GIS by zetaz http://blog.jcole.us/2007/11/24/on-efficiently-geo-referencing-ips-with-maxmind-geoip-and-mysql-gis/#comment-2640 Fri, 10 May 2013 14:18:22 +0000 http://jcole.us/blog/archives/2007/11/24/on-efficiently-geo-referencing-ips-with-maxmind-geoip-and-mysql-gis/#comment-2640 hello
first thank you for this very interesting tread.
I have some times, very big log files (50 000 lines) and want to use the maxmind database to know where the ip come from.
the scrypt proposed by Andy Skelton seems to be very nice but i don’t know how to use it with a table containing all the IP ( the IP are in IP V4 flavor)
for the more i’m really a newby in MySQL

so what i need.
For each IP in my iplog table i need as a result , the Ip itself + the country + region + city.

thank you for your help

]]> Comment on How does InnoDB behave without a Primary Key? by InnoDB without PRIMARY KEY | Open Query blog http://blog.jcole.us/2013/05/02/how-does-innodb-behave-without-a-primary-key/#comment-2638 Fri, 10 May 2013 10:30:53 +0000 http://blog.jcole.us/?p=1060#comment-2638 […] code caught he was definitely interested in exploring the issue. The result is this blog post: http://blog.jcole.us/2013/05/02/how-does-innodb-behave-without-a-primary-key/ for your enlightenment and […]

]]> Comment on InnoDB by InnoDB Tidbit: The doublewrite buffer wastes 32 pages (512 KiB) – Jeremy Cole http://blog.jcole.us/innodb/#comment-2595 Sun, 05 May 2013 19:24:25 +0000 http://blog.jcole.us/?page_id=906#comment-2595 [...] InnoDB [...]

]]> Comment on MySQL Community Contributor of the Year 2013 by Jinny http://blog.jcole.us/2013/04/25/mysql-community-contributor-of-the-year-2013/#comment-2576 Fri, 03 May 2013 12:52:08 +0000 http://blog.jcole.us/?p=1049#comment-2576 Congratulation! you deserved it. Keep doing your great job to make MySQL better.

]]> Comment on How does InnoDB behave without a Primary Key? by Jeremy Cole http://blog.jcole.us/2013/05/02/how-does-innodb-behave-without-a-primary-key/#comment-2572 Fri, 03 May 2013 06:28:04 +0000 http://blog.jcole.us/?p=1060#comment-2572 No, I don’t know of any reason it couldn’t be changed to use a per-table sequence. I would think it would be fairly easy actually.

]]> Comment on How does InnoDB behave without a Primary Key? by Justin Swanhart http://blog.jcole.us/2013/05/02/how-does-innodb-behave-without-a-primary-key/#comment-2571 Fri, 03 May 2013 06:24:15 +0000 http://blog.jcole.us/?p=1060#comment-2571 Very interesting. I too assumed that generation was via a per-table sequence. Is there a reason you can think of that a sequence could not be maintained per-table?

I ask, because it is very common to have partitioned tables without primary or unique keys.

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