Search results
Gino Redi (26 November 1908 – 27 September 1962) was an Italian composer. He was sometimes credited as P.G. Redi. Biography. Born Luigi Pulci in Rome, after graduating in composition at the Conservatory of Parma, Redi moved to Milan where he was active as a conductor for several small orchestras.
Apr 4, 2014 · "Non Dimenticar" is a popular song with music by P. G. Redi (Gino Redi, a.k.a. Luigi Pulci), the original Italian lyrics by Michele Galdieri, with English lyrics by Shelley Dobbins.The song was...
- 5 min
- 425
- KNguyenPianist
- Overview
- Building
- Limitations
- Usage
- Insert, Update and Delete
- Testing
- Authors
This PostgreSQL extension implements a Foreign Data Wrapper (FDW) for the Redis key/value database: http://redis.io/
This code was originally experimental, and largely intended as a pet project for Dave to experiment with and learn about FDWs in PostgreSQL. It has now been extended for production use by Andrew.
To build the code, you need the hiredis C interface to Redis installed on your system. You can checkout the hiredis from https://github.com/redis/hiredis or it might be available for your OS as it is for Fedora, for example.
Once that's done, the extension can be built with:
(assuming you have PostgreSQL 9.1 in /usr/local/pgsql91).
Make necessary changes for 9.2 and later.
You will need to have the right branch checked out to match the PostgreSQL release you are building against, as the FDW API has changed from release to release.
Dave has tested the original on Mac OS X 10.6 only, and Andrew on Fedora and Suse. Other *nix's should also work. Neither of us have tested on Windows, but the code should be good on MinGW.
•There's no such thing as a cursor in Redis in the SQL sense, nor MVCC, which leaves us with no way to atomically query the database for the available keys and then fetch each value. So, we get a list of keys to begin with, and then fetch whatever records still exist as we build the tuples.
•We can only push down a single qual to Redis, which must use the TEXTEQ operator, and must be on the 'key' column.
•There is no support for non-scalar datatypes in Redis such as lists, for PostgreSQL 9.1. There is such support for later releases.
•Redis has acquired cursors as of Release 2.8. This is used in all the mainline branches from REL9_2_STABLE on, for operations which would otherwise either scan the entire Redis database in a single sweep, or scan a single, possible large, keyset in a single sweep. Redis Releases prior to 2.8 are maintained on the REL9_x_STABLE_pre2.8 branches.
•Redis cursors have some significant limitations. The Redis docs say:
A given element may be returned multiple times. It is up to the application to handle the case of duplicated elements, for example only using the returned elements in order to perform operations that are safe when re-applied multiple times.
The following parameters can be set on a Redis foreign server:
address: The address or hostname of the Redis server. Default: 127.0.0.1
port: The port number on which the Redis server is listening. Default: 6379
The following parameters can be set on a Redis foreign table:
database: The numeric ID of the Redis database to query. Default: 0
(9.2 and later) tabletype: can be 'hash', 'list', 'set' or 'zset' Default: none, meaning only look at scalar values.
PostgreSQL acquired support for modifying foreign tables in release 9.3, and now the Redis Foreign Data Wrapper supports these too, for 9.3 and later PostgreSQL releases. There are a few restriction on this:
•only INSERT works for singleton key list tables, due to limitations in the Redis API for lists.
•INSERT and UPDATE only work for singleton key ZSET tables if they have the priority column
•non-singleton non-scalar tables must have an array type for the second column
The tests for 9.2 and later assume that you have access to a redis server on the localmachine with no password, and uses database 15, which must be empty, and that the redis-cli program is in the PATH when it is run. The test script checks that the database is empty before it tries to populate it, and it cleans up afterwards.
Get all the lyrics to songs by P. G. Redi and join the Genius community of music scholars to learn the meaning behind the lyrics.
Listen to P.G. Redi on Spotify. Artist · 197 monthly listeners. Preview of Spotify. Sign up to get unlimited songs and podcasts with occasional ads.
Enjoy the most popular songs of p.g. redi @WynkMusic. We have a collection of all the new, old & hit songs of p.g. redi. Play & Download now!
Explore P.G. Redi's discography including top tracks, albums, and reviews. Learn all about P.G. Redi on AllMusic.
