The market for server virtualization software appears to have gotten a whole lot more crowded this week. Not only did Oracle announce free server virtualization software at the Oracle Open World conference, but Microsoft and VMWare also made announcements of competing free offerings. And this morning at Oracle OpenWorld Sun announced their plans for virtualization also, known as xVM with support from Intel, AMD, Symantec and MySQL among others. Rich Green, head of Software at Sun, demonstrated Sun's xVM virtualization server and the xVM Ops Center management software console with a live demo deploying a workload to some Sun servers... READ MORE
Nov
14
2007
Nov
14
2007
Lua is a great programming language and I use it as embedded scripting language in
What impresses me most it's flexibility. What ever I come up with is only a few lines away ... and I have crazy ideas. Like profiling lua scripts with KCacheGrind.
For profiling lua-scripts you can use
[Read more]
Nov
14
2007
This is my personal whishlist for MySQL.
Please let me know if I'm wrong or if there is a workaround for
any of these items.
1. Per user and/or per database quota
Would very useful in setups for shared hosting. This would also
prevent one database from bringing down the whole server.
Separate tablespaces on different mountpoint can ease the pain,
but I consider that a nasty hack.
2. External authentication
I've seen numerous scripts which fetch the authentication info
from ldap, a file, another database or some other authentication
store. This should be integrated into mysql. The mysql grant
tables should be pluggable so it is possible to write a custom
authentication plugin. We already have plugable engines and
function (UDF) so this shouldn't be that hard is it?
3. Database locator
So you've got hundreds of servers.... and a multitude of
databases. How to connect to …
Nov
14
2007
This is my personal whishlist for MySQL.
Please let me know if I'm wrong or if there is a workaround for
any of these items.
1. Per user and/or per database quota
Would very useful in setups for shared hosting. This would also
prevent one database from bringing down the whole server.
Separate tablespaces on different mountpoint can ease the pain,
but I consider that a nasty hack.
2. External authentication
I've seen numerous scripts which fetch the authentication info
from ldap, a file, another database or some other authentication
store. This should be integrated into mysql. The mysql grant
tables should be pluggable so it is possible to write a custom
authentication plugin. We already have plugable engines and
function (UDF) so this shouldn't be that hard is it?
3. Database locator
So you've got hundreds of servers.... and a multitude of
databases. How to connect to …
Nov
14
2007
Today I saw a case where MySQL server is writing its binlog entries to the error log file ‘mysqld.err’ instead of writing it to regular binlog. This is happening with MySQL version 4.0.26 and not sure how it was triggered.
I am guessing it could be because the file handles got swapped, it can not be a memory overrun or anything else as I can see the error log is getting the right binlog entries. I am still trying to find what could have caused this to happen. This happened twise so far from the same property with the same setup; even though there is more than an year in between. If you restart the server or upon issuing FLUSH LOGS, everything will be back to normal.
Nov
14
2007
I’m setting up my first mysql cluster, and just wanted some clarification on a few things.
In the manual, it says:
Online schema changes. It is not possible to make online schema changes such as those accomplished using ALTER TABLE or CREATE INDEX, as the NDB Cluster engine does not support autodiscovery of such changes. (However, you can import or create a table that uses a different storage engine, and then convert it to NDB using ALTER TABLE tbl_name ENGINE=NDBCLUSTER. In such a case, you must issue a FLUSH TABLES statement to force the cluster to pick up the change.)
MySQL Cluster Exclusive Limitations
However, on another cluster limitations page, it says:
DDL operations. DDL operations (such as CREATE TABLE or ALTER TABLE) are not safe from data node failures. …
[Read more]
Nov
14
2007
I ran into something with mysql cluster today which boggles my mind. On http://dev.mysql.com/doc/refman/5.0/en/mysql-cluster-config-params-ndbd.html page, it is documented that if we you change datamemory parameter in the config.ini under mysql-cluster like below, you would have to restart nodes to reread the configuration. [NDBD] id=2 HostName=10.0.0.2 # the IP of the first data node DataMemory=6G IndexMemory=512M But when I tried the: [...] …
[Read more]
Nov
14
2007
Microsoft and Kyocera sign patent agreement. Volantis goes open. UnivaUD launches Grid.org community. (and more)
Microsoft and Kyocera Mita Enter Broad Patent Cross-Licensing Agreement, Microsoft / Kyocera Mita (Press Release)
Volantis Removes Price as Barrier for Enterprise Mobile Content Development and Delivery, Volantis (Press Release)
New Open Source Grid and Cluster Community Launches, UnivaUD (Press Release)
Red Hat and Platform Computing Collaborate to Deliver Integrated HPC Solution, Red Hat / Platform Computing …
[Read more]
Nov
13
2007
Lua is a great programming language and I use it as embedded scripting language in
What impresses me most it's flexibility. What ever I come up with is only a few lines away ... and I have crazy ideas. Like profiling lua scripts with KCacheGrind.
For profiling lua-scripts you can use
[Read more]
Nov
13
2007
Thank you Frankfurt, what an evening! Thanks a lot for the invitation and my trip-sponsors. In fact the people and venue were so nice, I am seriously looking for an excuse to go again.
For housekeeping, here are the promised slides (PDF, 0.662 MB, sans images). In Some Context I wrote:
I rarely see the point of posting the slides of a presentation for people who didn’t see the original presentation. Yet, this is often requested. I don’t have a problem with posting my […] slides […], but they are of little value without context and I do have a problem with posting things of little value, so here’s the context.
And it goes on to comment the slides I used for my CouchDB presentation in Zurich. The new slides are …
[Read more]