What is the best database system for my situation? [closed]
I’ve got a few coders, who program in C++/C# and PHP/Python but we right now need all the infrastructure (from you of course) and some advise on a Database System that could handle potentially...
View ArticleGeoJSON and php i cant visualy roads from postgres database
I am make a json file with geometry MultiLineString from the posgresql but when i try to load the file in map.data.loadGeoJsonis not visually the roads but if i take the link from google api example is...
View ArticleIs it possible to label a postgis Query Layer in ArcMap?
I’ve created a PostGIS query layer and I can’t label it. I’m trying to work out if I’m dealing with a bug that I can’t workaround, a bug that I can workaround, or if it is operator error. After getting...
View ArticleWhy does a select statement dirty cache bufferes in postgres
I am running EXPLAIN (ANALYZE, BUFFERS) SELECT ..... on a query in my Postgres 9.3 server. I end up seeing something like Buffers: shared hit=166416 dirtied=2 in the output. From the documentation,...
View ArticleExport PostGIS line to AutoCAD with graphical direction information
Some time ago I managed to export from PostgreSQL to AutoCAD DXF format a line (LINESTRING) using ogr2ogr program with a PostgreSQL Query, and it works (I can visualise it by the QuantumGIS). Now I...
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Similarity between two or more trajectories
I have the data of trucks (http://www.chorochronos.org/). This data are gps coordinates of multiple trajectories of trucks in Athens. I have to calculate the similarity between the trajetories, in...
View ArticleCopying database to different hard disk
Total noob at database administration here, excuse my ignorance. I have a server running a Rails application that’s using PostgreSQL. The database is saved on drive /z/, which seems to have filled up....
View Article“root” execution of the PostgreSQL server is not permitted
I run this code as root: /usr/local/bin/postgres -D /usr/local/pgsql/data because it wanted me to run it. However it gives this error; "root" execution of the PostgreSQL server is not permitted. The...
View Articlepg_get_viewdef error while running pg_dump in PostgreSQL
Occasionally, I get the following error while doing a simple pg_dump ( pg_dump -U postgres -Fc -f mybackup.dmp mydb): pg_dump: [archiver (db)] query failed: ERROR: could not open relation with OID...
View ArticleError creating a spatial database. ERROR
I have been trying to get Postgis set up for a while now, I am stuck on one error and have not found a solutions yet. This is on Ubuntu 14.04.1. I am trying to run: CREATE EXTENSION postgis But am...
View Articlemodeling data dimensions as columns – some dimensions are highly variable...
Please excuse my question if it is a bad one – I am not a DBA… I would like to model the following data: Let’s say that I have one column that is the row id as generated by a sequence. Let’s also say...
View ArticleIs a Postgres long-running query aborted if the connection is lost/broken?
If I open a connection to Postgres and issue a long-running query, and then break the connection (e.g., kill the client process that opened the connection), will the long-running query continue to run,...
View ArticlePostgresql doesn't accept replication connection
Plain old streaming replication. PostgreSQL: 9.2.7 Windows 8.1 64 bit My primary and secondary clusters are on same windows machine. I have already done pg_start_backup() and everything, so both...
View ArticlePostgres – Combine similar queries with extra where clause
I am trying to combine a number of fairly time consuming queries into one (if possible) The database contains race-track data that records the times for laps completed by drivers (or users here), the...
View ArticleQGIS isn't displaying dates in the attribute table
I have a QGIS project that links to data in a Postgres database. For some reason, QGIS is not displaying any data in date fields. The date fields appear to be fine in Postgres and I have performed...
View ArticleList distinct column values where those rows share other column values
I’m trying to write a query to detect possibly-invalid data in a PostgreSQL table. We have a table of city names like this: # `city_names` id | name | language | dialect | city_id...
View ArticlePostgreSQL – summing arrays by index
I have an array of doubles column (double precision[]) in PostgreSQL that keeps half hour values for a day. So each array holds 48 values. I need an efficient query that is summing all this array...
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If do not want to use pgRouting then what?
Good evening fellow GISers, I am interested in creating an online routing application. So supposing I have all the data I want into a postGIS database and loaded onto GeoServer and I am willing to use...
View ArticlePostgres inherit indexes for partitioned tables
I have a table with approximately 60 million rows that I have partitioned by state into 53 sub-tables. These tables “inherit” the big table like so: CREATE TABLE b2b_ak (LIKE b2b including indexes,...
View ArticleEnsuring that 1 row has 5 specific records referencing it
Context: a TEST has many CASEs. Typical. However, the catch is that a TEST instance must have exactly 5 instances of CASE (1 to 5). I could do something like this: create table TEST ( ID Integer not...
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