3
votes
3answers
184 views

Join table on some conditions

I've got a table called activities. And a table messages. Activity has many messages, and one message has one activity. This are the message columns : id sender_id receiver_id body activity_id I'm ...
0
votes
1answer
58 views

How to index WHERE (start_date >= '2013-12-15')

I have a table named items, and inside the table there is a some_date column, with date as the datatype. I was wondering how can I index the some_date column with PostgreSQL SELECT "items".* FROM ...
3
votes
2answers
73 views

Compound Index on 43 Million PostgreSQL table

This question is related to a prior one of I asked: Order of columns in a compound index in PostgreSQL (and query order) Rather than overload that question, I figure I can sharpen and limit my ...
1
vote
1answer
41 views

Spliting Datetime into 2 Columns for Restaurant Reservation Schema?

Using PostgreSQL. The primary driver of this is that while no reservation will exist without a date and time, a user can search for and monitor reservations using a time or date or both. With a ...
2
votes
1answer
79 views

2 B-tree indices OR 1 GiST index on tsrange — which will perform better?

I have a table which is storing reservation data using the columns starts_at & ends_at Whenever I'm querying the table to find overlapping reservations, I have an option of using one of the ...
2
votes
2answers
92 views

Most performant way to fetch last record

I have a Postgres table Prices with the columns price (Decimal) product_id (Int) Prices get updated regularly and I keep old prices in the table. For a given product, the last price in the table ...
0
votes
1answer
80 views

How to store values of all columns in an index in PostgreSQL?

As described here: https://devcenter.heroku.com/articles/postgresql-indexes#managing-and-maintaining-indexes indexes do not store the entire row data themselves. Is it possible to store the whole row ...
1
vote
1answer
109 views

Index method for very few updates and many inserts

I am using Postgresql 9.1 with *pg_trgm* extension. I need to create an index on a text-based field. I do not need full-text searches, I use ILIKE queries to make my searches. I will use pg_trgm but ...
4
votes
1answer
610 views

How to properly index hstore tags column to faster search for keys

I imported a large area of OpenStreetMap's planet.osm file into a postgresql database. The database contains a table called nodes. Each node has a geometry column called geom and a hstore column ...
3
votes
0answers
144 views

How to count selectivity rows in PostgreSQL 8.2

I have problem with two queries on PostgreSQL v8.2. It seem like the optimizer chooses a wrong index: db=# explain select count(*), messagetype, alias from event where templateinfoid = 10 and ...
4
votes
1answer
149 views

After Rackspace server creation, PostgreSQL query planner doesn't work as expected

We created an image of one of our database servers in Rackspace. Then, we created a new server using that image, expecting things to work. However, the index performance we have seen seems to be ...
1
vote
1answer
293 views

Use GIN to index bit strings

I'm trying to extend PostgreSQL to index bit strings up to 1000 bits. (These bit strings are created by quantization of high-dimensional vectors, so for each dimension up to 4 bits are assigned). ...
5
votes
2answers
903 views

Multicolumn index and performance

I have a table with a multicolumn index, and I have doubts about the proper sorting of the indexes to get the maximum performance on the queries. The scenario: PostgreSQL 8.4, table with about 1MM ...
3
votes
2answers
428 views

How do I know what indexes to create for a table

Is there a way I can figure out the best way to know which indexes to create for a table?
2
votes
1answer
101 views

Does updating a partially indexed field add or remove it from an index in Postgres

We can create a partial index for a field in Postgres. I am looking at using this to stop rows which are archived from being in an index on a created_at field: First we create the index: test=# ...
7
votes
2answers
759 views

PostgreSQL Index Caching

I'm having difficulty finding 'lay' explanations of how indexes are cached in PostgreSQL, so I'd like a reality check on any or all of these assumptions: PostgreSQL indexes, like rows, live on disk ...
4
votes
3answers
691 views

Lookup table for a one-to-many relationship

I have a tickets table with an id that I need to associate to a lookup table where the counterpart of that data is another id that is controlled from an outside source. tickets - id - sutff lookup - ...