On 3/23/06, FlaBot flabot@googlemail.com wrote:
the gzip inside the mysql is a problem .. you cant regexp inside the gzip-mysql-fields.
The regexp isn't going to use an index anyways, so the cost of doing this in your application is fairly low (just the extra database round trip). This stuff isn't magic. If you regexp against article text the DB is going to be forced to read every eligible article... in fact it might even be stupid enough to apply the regexp before other more useful constraints.
Yes there is a little extra cost to send the data to the application for filtering (and potentially aggregation), but it's really not major.
Yes, it's an inconvenience... but from what I can tell most of the toolserver users implement most of their logic in their applications. (Typical mysql practice I guess)...
If the mysql get the data from the master/slaves from the wiki , why must the data stored in the same content ? why cant the last version be uncompressed ?
Because we're using mysql replication. Were we not using mysql replication you'd hear me whining to replace mysql 5 with another database system that doesn't completely suck for adhoc queries, like PGSQL.
I believe that mysql now supports user defined functions, so it wouldn't be too hard to create a function so you could do something like:
select id from table where php_decompress(text) REGEXP 'whatever';
Is the problem cpu ? disk-space ? mysql can do this ? no one mod the server to behave in that way ?
Wasent the idee of the server to give developers on the server acces to a live uncompressed version on the live- wiki ?
In all honesty, If you're not able to handle decompressing the content, I have serious questions about your ability to do something useful with the resource ... No insult intended. It's just really not that hard.
I am a gynaecologist not a mysql/php/what-ever-guru .. but perhaps my question can help to find answers to problems.
But the first step of solving a problem is allready been done .. we talk together ,, me exchange informations ..
There is only so much that can be done without getting down and dirty with the technical bits and bytes. At some point in the future someone may create a system to help less technical users create the sort of reports and tools that can be created on toolserver, but we do not have that today.
It is not an easy problem .... On our larger Wikis like de and en our database is big enough that if you don't understand things like the computational order of your query, and the limitations of index use in mysql (only one index per table is used to constrain the rows recalled), you will often just build queries which never complete in a useful amount of time.