GSoC Proposal - Caching query results in pgpool-II

Hello

I am sending my proposal about Google Summer Of Code2011.
It would be nice if you could give me your opinion.

・title

Caching query results in pgpool-II

・Synopsis

Pgpool-II has query caching functionality using storage provided by
dedicated PostgreSQL ("system database"). This has several drawbacks
however. 1)it is slow because it needs to access disk storage 2)it
does not invalidate the cache automatically.

This proposal tries to solve these problems.

- To speed up the cache access, it will be placed on memory, rather
than database. The memory will be put on shared memory or external
memory services such as memcached so that the cache can be shared by
multiple sessions. Old cache entries will be deleted by LRU manner.

- The cache will be invalidated automatically upon the timing when the
relevant tables are updated. Note that this is not always possible
because the query result might come from multiple tables, views or
even functions. In this case the cache will be invalidated by
timeout(or they are not cached at all).

- Fine tuning knobs need to be invented to control the cache behavior
though they are not clear at this moment.

・Benefits to the PostgreSQL Community:

Query caching will effectively enhance the performance of PostgreSQL
and this project will contribute to increase the number of users of
PostgreSQL, who need more high performance database systems.

Note that implementing query cache in pgpool-II will bring merits not
only to the latest version of PostgreSQL but to the previous releases
of PostgreSQL.

・Project Schedule

-April
preparation

-May 1 - May 22
write a specification

-May 23 - June 19
coding

-June 20 - July 22
test

-July 23 - August 12
Complete of coding and test, commit

・Personal Data and Biographical Information

Name : Masanori Yamazaki
Born : 23.1.1981
School :Currently I learn contemporary philosophy, culture and literature
at Waseda University in Japan.
Coding :
1.About five years job as web application programer(PHP, Java).
2.I experienced projects used framework such as Symfony, Zend Framework,
CakePHP, and Struts.
3.I am interested in OSS and like coding.

Regards