PostgreSQL is an enterprise class, open-source, object-relational database management system (ORDBMS) available for all major platforms including Linux, UNIX, Windows and OS X. Please mention your exact PostgreSQL version when asking questions.

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Querying really slow Postgres

I have multiple tables on Postgres wit GIS and when I query SELECT * FROM rxmsg JOIN Vehicles ON rxmsg.vid=Vehicles.vid JOIN stops on ST_DWithin(rxmsg.point, stops.point,1000) JOIN drivers ON ...
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24 views

Postgres drop type XX000 “cache lookup failed for type”

I'm currently working on a PostgreSQL 9.2.x Database with a lots of Clients, and tables and functions. We deploy code constantly and sometimes it is necessary to even drop a type or a function due ...
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1answer
26 views

Is it safe to use set-returning sql functions instead of security-barrier views?

Since 9.2, it's been possible to use the security_barrier attribute to guard against maliciously-chosen functions and operators accessing data 'hidden' behind filters in views (full info in the ...
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28 views

Postgresql service run failure

Trying to setup replication through the wal shipping using Postgresql 9.3 x64. Used this instruction from youtube. The problem is - the slave postgresql service won't run. This is what in logs ...
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28 views

How to copy remote database to local cluster using pgAdmin over SSH tunneling with Postgres 9.x?

I have successfully gotten pgAdmin on my development machine to do ssh tunneling over the internet to my production server. I can see the remote database and browse its tables and such. ➥ How to suck ...
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1answer
26 views

Moving Local PostgreSQL 8.4.20 Database to Amazon EC2 or RDS

I'm running PostgresSQL 8.4.20 on a local server and plan to migrate the data to either Amazon EC2 or RDS. I have working knowledge of databases and need advice from experts. I've been researching ...
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0answers
12 views

Getting PAM-compatible password hashes from pgcrypto

I want to keep user records in Postgres database and faced one issue which block me. It is password encryption. For example, this is correcetly encrypted password 12345 via default Ubuntu crypt ...
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1answer
77 views

Slow max, min query in Postgresql View

I have a view and it's a left join between two tables (table_a has hundreds of millions of rows, table_b has ~2 millions). The query SELECT MIN("id") AS "min_id",MAX("id") AS "max_id" FROM "the_view" ...
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36 views

PostgreSQL Idle Session in Transactions with RELEASE_EXEC_SVP queries and lock

I am having a problem with having idle sessions in transactions. In pgAdmin Server Status, it is showing "RELEASE_EXEC_SVP_XXXXXX" (XXXXXX data are varied) as its query and it's locks also contain a ...
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1answer
41 views

How do you truncate a `date` (not `timestamptz`) to month?

Postgres has date_trunc which operates on timestamp or interval, and: Values of type date and time are cast automatically to timestamp or interval, respectively. In other words we can use ...
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2answers
62 views

How to calculate the cumulative difference between rows in Postgres?

I am in need of calculating the difference from the cumulative values for the previous day in Postgres based on session_id. Example as mentioned below: Date session_id upload_usage ...
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29 views

Is there a parser for Postgres' auto_explain to make it easier to read and understand?

We have a number of Postgres Functions that each call a number of other Postgres Functions. If you simply EXPLAIN ANALYSE a call like SELECT parent_function(), the output is minimal, since it doesn't ...
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1answer
52 views

How to remove object from json array?

My table: CREATE TABLE items ( id BIGINT PRIMARY KEY NOT NULL, name VARCHAR, images json ); images format: [ { "id": "owner", "full": "<url>", "thumb": ...
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1answer
27 views

Database storage limit for open source PostgresSQL

I just started using PostgresSQL. When I installed SQL Server Express years back, you typically had a database storage limit if you didn't install the full version. I think I remember it being 4GB, ...
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1answer
41 views

PostgreSQL - retrieving max primary key column to insert a new row - any alternatives?

We are using a software that needs to request the max primary key column value to add a new row into the table that was requested. I know that there are some alternatives like: Sequences, and GUIDs ...
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1answer
31 views

“explain analyze” cannot get detailed analyzed results for queries in a plpgsql function

I am using postgresql 9.3 I have a function (Pl/PgSQL) created with serveral complex queries inside. For example, create function f1() return integer as $$ declare event tablename%ROWTYPE; .... .... ...
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24 views

Slow query on large table after new column is added

I have a table with more than 30 million records, and I recently added a new column with type text. ALTER TABLE database.b ADD COLUMN x TEXT; CREATE INDEX CONCURRENTLY idx_x on database.b(a, x); ...
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1answer
74 views

Connect to PostgreSQL via a ssh tunnel using Cygwin

I would like to connect to a Postgres server installed on a remote server using an ssh tunnel. I have Windows so I use cygwin for SSH. I do the following on cygwin: # Create the tunnel ssh -f ...
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3answers
114 views

Return total number of rows and selected (aggregated) data

I have a function which is selecting some data from a table. I would like to return the selected data and the total number of rows in that table. How can I do that or how can I get the same result in ...
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2answers
64 views

postgres function extract from date returns double precision value

Why does postgres function extracting from date return double precision value? Only reason I could imagine is, there are some locales using calendars (those not Gregorian calendars and supported by ...
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0answers
27 views

migrate standalone postgresql database cluster to high availability cluster

We have tested one setup of postgres HA with repmgr and pgpool. It is working fine and now we have to migrate our existing database to the HA setup. We have two approaches, Make the HA master as ...
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2answers
93 views

Logging in to phppgadmin remotely Ubuntu 14.04 Amazon EC2

I created an Ubuntu server instance on Amazon EC2 and installed php, postgreSQL, phppgadmin, and any other required features. After SSH'ing into the server using command prompt, I executed the ...
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36 views

Best practice for select or insert into [duplicate]

I was looking for quite some time on whats the best way of selecting or inserting some data. I have two tables: ReportData: report_data_id(pk), source_id(fk), value1; Source: source_id(pk), ...
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26 views

User with Connect privilege can create tables [duplicate]

postgres=# \list+ List of databases Name | Owner | Encoding | Collate | Ctype | Access privileges | Size | ...
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1answer
31 views

WAL files are not copied

I'm using postgres 9.3 on Ubuntu 14.04 and I'm currently setting up a WAL backup. These are my changes to the postgresql.conf: [as described here: ...
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1answer
96 views

Using EXCEPTION to ignore duplicates during bulk inserts

In pq 9.3.5, I'm importing records from an external source where duplicates are VERY rare, but they do happen. Given a readings table with a unique compound key on (real_time_device_id, recorded_at), ...
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1answer
29 views

Query with column data for a max

In Postgres, I have a table like this: Column | Type | Modifiers ...
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0answers
16 views

Is it possible to create materialized view based on another materialized view in postgres?

I have a very large table and I summarize it in a materialized view. I then create an even smaller materialized view based on the earlier mview. The second mv is always showing zero rows. Is there a ...
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1answer
176 views

connect to PostgreSQL server: FATAL: no pg_hba.conf entry for host

Hello I am trying to run a website sent to me but after doing so this error appeared connect to PostgreSQL server: FATAL: no pg_hba.conf entry for host "4X.XXX.XX.XXX", user "userXXX", database ...
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2answers
121 views

PostgreSQL joining using JSONB

I have this SQL: CREATE TABLE test(id SERIAL PRIMARY KEY, data JSONB); INSERT INTO test(data) VALUES('{"parent":null,"children":[2,3]}'); INSERT INTO test(data) ...
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34 views

Best way to store a function map

I am building a site where data gets filtered through user defined functions to create an output. It is a requirement that the functions are represented in the database as formulas. For example a ...
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0answers
26 views

PostgreSQL: Store hierarchial data and return a recursive result with full path data

Background: I am considering whether to use LTREE or Recursive CTE with Materialized Path. For storing data, I am deciding between HSTORE or JSON. Objective: I need to store a hierarchial data. Each ...
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1answer
49 views

PostgeSQL 9.3: What is the difference between text and pg_catalog.text?

I have a classic 3-environments setting (dev, staging and production), each with its own RDS PostgreSQL 9.3. The client/server versions are psql (9.3.5, server 9.3.3). In order to keep the schemas ...
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1answer
50 views

PostgreSQL, UPDATE CASE statement uses huge amount of space

I am running a CASE statement on one of my tables and it consumes a huge amount of hard drive space that is never freed up even when i run VACUUM ANALYZE. Autovacuum is ON as well. I am using ...
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0answers
135 views

ERROR: relation “name” does not exist

I am trying to import a postgresql database table sent to me in phpPgAdmin, I am following the instruction from this import database But after doing so, several error appear, I also tried to import ...
3
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1answer
152 views

Get list of characters in column

I have a database table (UTF-8) with a lot of names in different languages with lots of special characters. In another script I use these names and one part is to replace the special characters. To ...
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1answer
39 views

Dump all binary columns from a table as files

I have a table in a postgresql database with a column of type bytea. I want to drop each binary entry as a file using the id as filename. What would a SQL query look like for this?
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2answers
328 views

Performance Benchmark - MySQL vs PostgreSQL [closed]

this is my first question here in DBA. I wish to do a performance comparison between MySQL and PostgreSQL using same database on the basis of total time taken to parse + execute + send result back ...
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1answer
34 views

Postgresql - Streaming replication - STONITH

Current situation: PostgreSQL, streaming replication Master failed, I created the trigger file. Slave is promoted to new master After the old master restarted successfully, I have to create base ...
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1answer
28 views

can I give permission to insert into view, but not to referred table?

Here I have a view in public schema referring to the table in private schema: CREATE OR REPLACE VIEW public.products AS SELECT products.id, products.product_id, products.title, products.company_id ...
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1answer
17 views

postgresql unable to login

I created a user named 'client', witch refuses to connect. Here's my client: CREATE ROLE client LOGIN ENCRYPTED PASSWORD 'md5d5bc32b75da65fe60067f501a4bb6665' NOSUPERUSER INHERIT NOCREATEDB ...
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0answers
22 views

Is content of the pg_autovacuum saved when pg_dumpall is used to backup the database?

From the docs: pg_dumpall also dumps global objects that are common to all databases. (pg_dump does not save these objects.) This currently includes information about database users and groups, ...
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33 views

Optimizing postgres row overlap constraints involving UUIDs and GIST

For various reasons all my tables have UUIDs as primary keys and I need to exclude duplicate rows where the combination of area_id, user_id, and finished_at <-> started_at window. The only way I ...
3
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1answer
67 views

PostgreSQL CREATE INDEX memory requirement

I've got 6GB of RAM on my laptop and for a test I'm creating a 50mil-rows table in PostgreSQL 9.3. I then want to create an index on the table. The table and the resulting index together (or twice ...
2
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0answers
85 views

UPDATE/DELETE performance on partitioned table

Hi I'm using table partitioning in my Postgres 9.3. I've notice that the DELETE and UPDATE queries are much slower when I'm doing them via the parent table. I see that the constraint_exclusion is ...
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1answer
30 views

Email open rate calculations in subqueries with postgres

So I'm relatively new to PostgreSQL, but here we go: I have a pgsql database that is receiving HTTP Post Email Events from my Sendgrid email server, and am trying to make a dashboard that displays ...
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1answer
30 views

Can any one Explain me What is the Use of Cascading Replication in Postgresql?

What are the advantages of cascading replication in PostgreSQL. I have done Testing On this With three nodes. M1---->S1----->S2 What is the Use if My master(M1) goes Down(failover). Where the ...
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1answer
67 views

Reassigning surrogate keys?

I have a few tables with surrogate keys (SERIAL PRIMARY KEYs unique to each tables). These tables are used by other tables, with references to these keys. My usage of these is quite simple : select ...
3
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1answer
69 views

How to determine cost/benefit of adding an index?

According to Craig Ringer: While it's usually a good idea to create an index on (or including) your referencing-side foreign key columns, it isn't required. Each index you add slows DML operations ...
2
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1answer
38 views

Removing a FAILED node from repmgr cluster

How do I remove failed node from a PostgreSQL cluster? postgres@db-prod-ms47ox-10-3-104-92:~$ repmgr -f /etc/repmgr/repmgr.conf cluster show Role | Connection String * master | ...