Home |  MySQL Buzz |  FAQ |  Feeds |  Submit your blog feed |  Feedback |  Archive |  Aggregate feed RSS 2.0 English Deutsch Español Français Italiano 日本語 Русский Português 中文
Showing entries 1 to 5

Displaying posts with tag: commit (reset)

The strange commit behavior and the invisible Xid_log_event
+2 Vote Up -0Vote Down

Did you see this when you are migrating from your lovely MySQL 5.1 to MySQL 5.5?
Oh, sorry, you remain attached to your pretty 4.1. Yes, I know, MyISAM has become so important in your life…

Ok, seriously, I would like to share this little observation I made recently when switching to MySQL 5.5 on one slave.
You can see below two graphs for the transactional activity, there is exactly the same volume of update, delete and insert queries :

MySQL 5.1

MySQL 5.5



  [Read more...]
MySQL 5.6 Replication – New Early Access Features
Employee_Team +2 Vote Up -0Vote Down
0 0 1 1037 5914 Homework 49 13 6938 14.0 Normal 0 false false false EN-GB JA X-NONE

0 0 1 204 1168 Homework 9 2 1370 14.0 Normal 0 false false false EN-GB JA X-NONE

  [Read more...]
A rollback query on innodb does not reset the auto_increment counter?!?!?
+0 Vote Up -0Vote Down
So, this is a small blog that I felt necessity to do cause I am seeing many tweets on twitter (obviously) talking about that “a rollback query on innodb does not reset the auto_increment counter”. I quickly went test it and really didn’t understand what happened with this user environment, due to it I decided [...]
Implicit COMMIT considered harmful.
+2 Vote Up -0Vote Down

If you execute the following, what does your RDBMS do?

CREATE TABLE t1 (a int);
START TRANSACTION;
INSERT INTO t1 (a) VALUES (1);
START TRANSACTION;
INSERT INTO t1 (a) VALUES (2);
ROLLBACK;
SELECT * FROM t1;

The answer may surprise you.

Benchmarking MySQL ACID performance with SysBench
+0 Vote Up -2Vote Down

A couple of question I get a lot from MySQL customers is “how will this hardware upgrade improve my transactions per second (TPS)” and “what level of TPS will MySQL perform on this hardware if I’m running ACID settings?” Running sysbench against MySQL with different values for per-thread and global memory buffer sizes, ACID settings, and other settings gives me concrete values to bring to the customer to show the impact that more RAM, faster CPUs, faster disks, or cnf changes have on the server. Here are some examples for a common question: “If I’m using full ACID settings vs non-ACID settings what performance am I going to get from this server?”

Let’s find out by running sysbench with the following settings (most are self explanatory – if not the man page can explain them):

  • sysbench –test=oltp
  [Read more...]
Showing entries 1 to 5

Planet MySQL © 1995, 2014, Oracle Corporation and/or its affiliates   Legal Policies | Your Privacy Rights | Terms of Use

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.