ztyx - Developer IT

How stable is POHMELFS?

- by Ztyx

I am currently looking into POHMELFS because of its ability to scale reads. Does anyone have it in production and could tell me how stable it is?

Evaluate a Munin graph defined in munin.conf

- by Ztyx

Hi, I have defined an additional graph (in Munin, munin.conf) that calculates the total size of my MySQL database. The index and data sizes are extracted from an external plugin. The definition looks like this: [...] [Database;my.host.com] address my.host.com use_node_name yes dbsize.update no dbsize.graph_args --base 1024 -l 0 dbsize.graph_title Total database size dbsize.graph_vlabel bytes dbsize.graph_category mysql dbsize.graph_info The total database size. dbsize.graph_order the_sum dbsize.the_sum.sum \ my.host.com:mysql_size.index \ my.host.com:mysql_size.datas dbsize.the_sum.label data+index dbsize.the_sum.type GAUGE dbsize.the_sum.min 0 [...] Now, is it possible to extract the current value of this graph? Running # munin-run dbsize or # munin-run my.host.com:dbsize does not seem to work.

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How does NFS read cache work on Debian?

- by Ztyx

I am planning to use NFS to serve out many small files. They will be read very often so client side caching is crucial. Does NFS handle this? Is there a way to increase the client side caching in some way? ...or should I look at another solution? Syncing using rsync or unison periodically is not an option since the files are modified on the client side from time to time.

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MySQL privilege needed to grant "SHOW INDEX" access

- by Ztyx

I'd like a monitor user be able to (only) execute "SHOW INDEX" and "SHOW TABLES" on a certain database. What privileges should I GRANT this user? I'd rather not open up for the user to be able to do SELECTs...

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Does CHECK TABLE add read/write locks?

- by Ztyx

Hi, Yesterday I ran CHECK TABLE on a table that is read very frequently. I scanned the MySQL documentation for CHECK TABLE for any mentions of "lock" (and found none) and also noticed that only SELECT privilege was required to run the command. I therefor concluded that the command did not do any read lock and was safe to run even in production. Sadly, running the command took 1 minute and 37 seconds and seemed to block all read access. My question is therefor, does CHECK TABLE do any read lock? Any other reason why I experienced a read block on the table? Thanks

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Control vertical source ordering with 960.gs?

- by Ztyx

Hi, I've understood it's possible to control the vertical (columnwise) source ordering with the 960 Grid System. However, is it possible to do something similar vertically? If not, does anyone know of any grid system that handles source ordering vertically? Thanks, Jens

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Possible to control vertical source ordering with 960 Grid System?

- by Ztyx

Hi, I've understood it's possible to control the horizontal (columnwise) source ordering with the 960 Grid System. However, is it possible to do something similar vertically? If not, does anyone know of any grid system that handles source ordering vertically? Thanks, Jens

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How do I get the height of a GWT object in pixels?

- by Ztyx

How do I get the height of a GWT object in pixels? I am trying to find a getHeight method or something similar..

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Check the total content size of a tar gz file

- by Ztyx

How can I extract the size of the total uncompressed file data in a .tar.gz file?

Developer IT