Questions tagged [postgresql]
All versions of PostgreSQL. Add an additional version-specific tag like postgresql-11 if that context is important.
10,309
questions
1
vote
2answers
27 views
Split read/write requests over different read/write datasources
Recently I have run some performance tests on the application I work on, and it turns out that it didn't do really well ( the problem is mainly between the back and the DB). So as investigating the ...
0
votes
0answers
28 views
Unit postgresql.service failed to load: No such file or directory
When i try to connect to my postgres database, i get the error below:
could not connect to server: Connection timed out (0x0000274C/10060) Is the server running on host "10.2.1.96" and accepting ...
0
votes
3answers
83 views
Array containment queries in Postgres
Question on GIN index on array.
I have 2 million rows in a work table.And I need to find work that a user can do, based on the skills he has and also the highest priority work. User always will have ...
0
votes
0answers
17 views
Execute query against similar tables across schemas
I have a postgres database with several schemas each of which contain a table with the same definition and name. I want run a cleanup statement against all of these tables without manually specifying ...
0
votes
1answer
28 views
How to design a table/ unique index where uniqueness is temporal?
I have a table that records observed movies in a cinema:
CREATE TABLE cinema_movie_name (
id integer DEFAULT nextval('cinema_movie_name_id_seq'::regclass) PRIMARY KEY,
cinema_id integer NOT NULL ...
0
votes
2answers
42 views
Group by arbitary monthly time period
I want to group the following data by an user defined period:
+------------+--------+
| DATE | Amount |
+------------+--------+
| 2019-03-12 | 300 |
| 2019-03-15 | 1500 |
| 2019-03-25 | ...
1
vote
1answer
20 views
DatetimeFieldOverflow when inserting more than three decimals precision
TIMESTAMP type should be fine (docs)
timestamp [ (p) ] [ without time zone ] 8 bytes both date and time (no time zone) 1 microsecond / 14 digits
Create the table like:
CREATE TABLE IF NOT ...
0
votes
0answers
24 views
Materialized view bigger than table it is based on?
I have a database that's ~130 GB and one table makes up for most of this (85 GB). Because this table holds a lot of duplicates, we have a materialized view which basically uses a window function to ...
0
votes
1answer
48 views
Efficient SELECT for array of tuples in PostgreSQL
Assume I have a table records with the following structure
id (unique int)
updated (timestamp)
I have an input_array with values [[id_1, timestamp_1], [id_4, timestamp_4], ...]. I'll refer to each ...
0
votes
1answer
56 views
Optimize a postgresql database view query
Given the following database schema (using rails-like associations, as this is a ruby-on-rails project, also please forgive me for how I phrase this for I am new to this forum):
Client has_many Deals ...
1
vote
1answer
22 views
ALTER TABLE ADD CONSTRAINT failing when executed from function
So I have 2 functions that I am writing, one to drop all foreign constraints for a schema, and the other will recreate these foreign constraints as they once were.
The drop constraints function works ...
0
votes
3answers
27 views
Postgres permission issues for new views
I have a RDS postgres database that only uses the public schema.
I expect the webservice user to get access to all newly created views. When I create a view using the master user, I see all the ...
0
votes
0answers
14 views
replication & load balancer with postgresql configuration
I configured a master-slave replication server with postgres 9.6 following this doc and all worked fine. When I make changes on master server immediately are replicated to slave server and I cannot ...
0
votes
1answer
17 views
How to rank an aggregation in each newly formed group?
The problem below that I would like to solve sounds quite simple but it is quite difficult for me to arrive at the solution with SQL.
Let's say I have a simplified ERD that looks as follows:
This ...
0
votes
1answer
19 views
Create a foreign key to a table that doesn't exist in postgres
I'm trying to put together a solution where I have a bunch of script files that contain my schema creation. Something similar to Visual Studio's SQL Project, but for Postgres.
My problem is that the ...
0
votes
3answers
27 views
How to prevent trigger from overwriting values that were explicitly set?
I tried this but doesn't work because NEW.updated is never NULL (I suppose NEW gets populated by the values currently in the row in addition to the values in the update-statement?):
create temp table ...
0
votes
0answers
29 views
Sql, get data/rows for more selected ids in one condition, from file
I am using PostgreSQL 11.5 on Ubuntu
Question
How can I get data/rows for more selected ids in one where condition? Ideally from file with list of ids.
Example
|product_id |product_name ...
0
votes
1answer
44 views
How can I run a pgAgent job every 10 second?
I have a PostgreSQL 11.3 Database. I installed pgAgent for creating jobs. Now I want to run my job every 10 second, but in GUI there is possibility to write with precision of minutes, not with ...
0
votes
0answers
31 views
Postgres uses sequential scan with OR condition, but index scan with AND condition
We are doing a full text search on an object. Unfortunately, the object is normalized across different tables, and the full text search results in a condition with several OR, because the term can ...
0
votes
1answer
24 views
Postgresql - how to list indexes on a table that is partitioned?
This command works for non-partitioned tables:
select * from pg_indexes
But for partitioned tables, it does not list the original index, but the indexes that postgresql created for each partition.
...
1
vote
1answer
28 views
Unable to alter partition table to set logged
I have a partition table that I created UNLOGGED. I'm using pg_partman to manage the partition. I then proceeded to load data into it with a COPY command.
Afterwards, I ran an alter table set logged ...
0
votes
1answer
21 views
Multiple versions of PostGIS and PgRouting on CentOS 7
I'm trying to install multiple versions of PostGis and PgRouting in the same instance of PostgreSQL v9.6, using CentOS 7.5.
I've been fighting with dependencies and shared libraries, to make all ...
1
vote
1answer
152 views
Postgres table with 35m rows slow queries. how can i improve the performance?
SELECT count(c.id) as clickCount
FROM clicks c
LEFT JOIN links l on c.link_id = l.id
LEFT JOIN user_agents ua on c.user_agent_id = ua.id
AND ua.robot IS NULL
WHERE l....
0
votes
0answers
34 views
Grant Privileges on Production Database Throws “Error: tuple concurrently updated”
I would like to grant read access to all tables in my schema
GRANT SELECT ON ALL TABLES IN SCHEMA public TO XXX;
While it works on our alpha environment, it fails with our production database:
[...
0
votes
1answer
61 views
How to pivot multiple columns in PostgreSQL 9.5?
I have the sample data as follows and want to find if I can use crosstab function in this case.
Sample Data:
ITEM | CD | TYPE |PARTS | PART | CNT |
Item 1 | A | AVG |2 | 1 | 10 |
Item ...
2
votes
2answers
32 views
Summing the count of two columns in postgres that contain the same value
I want to sum the total number of occurrences of one value across two columns in the same table.
So, an example would be:
id |node1 |node2
1 | 111 | 123
2 | 122 | 124
3 | 111 | 125
4 ...
0
votes
2answers
36 views
When to ANALYZE/VACUUM/REINDEX when adding primary keys and indexes
I have a recurring job that creates a Postgres (v11) database from a template and loads it with data. The scale of the data is on the order of 10s or 100s of millions of rows, so for performance ...
0
votes
1answer
19 views
Postresql dynamic index creation for many tables
How can I create an index in Postgres dynamically over many tables but always with different names.
Lets assume table x has a column y with all table names of hundreds tables which need to get an ...
0
votes
1answer
24 views
Error: pq: 1 columns must reference exactly 1 columns in referenced table (found 2) [closed]
I have a few tables and I am facing this issue most likely with the table "item".
When I remove restaurant_id and category_id, it works fine.
CREATE TABLE IF NOT EXISTS restaurant
(
id ...
0
votes
2answers
38 views
How to count decimals without zeros
How can I count all decimal place up to the first zero
For example I have a column named x with an entry of numeric datatype value 1.955000000
I want to count the decimal places without the zeros. ...
0
votes
1answer
33 views
Schema and Query design for table with multiple languages [closed]
I've been researching on how to create a schema for a database that contains multiple languages. So I decided to separate the translations on a different table with a column as the language and ...
0
votes
1answer
25 views
How to insert values to one table from the table stored in another database in postgresql?
Here is the structure of table:
`* Table 1 of database A contains mobile number and userId and both field cannot be blank
I want to fetch data from table 1 of database A and insert that with some ...
1
vote
3answers
54 views
Take average of multiple nullable columns
I have an example table (year) as below in PostgreSQL 9.5:
Name | 2010 | 2011 | 2012
-------------------------
A | 10 | | 40
B | 10 | 20 | 30
Now, if I write a simple query as ...
1
vote
2answers
44 views
postgresql - add the missing rows to each group of year/date
i have this table --> https://pasteboard.co/IrVXlRe.png
and there is another table --> https://pasteboard.co/IrVXNPh.png
what i need is to show ALL categories regardless of the quantity. if there ...
1
vote
1answer
22 views
sequence keys for static data
In my data model I have some static data that is added to over time as the system changes. For instance:
create table region (id SERIAL,crname TEXT);
customer has a link to the region, my system ...
1
vote
1answer
22 views
Postgresql replication slot used by barman has a long replay_lag
I set up barman using wal streaming, I just notice I have a hug replay_lag. I'd like to keep it down to 0 but have no idea about how to do this.
I also have a database replica and it is working fine.
...
2
votes
1answer
32 views
Why does DELETE not work after an UPDATE in a CTE?
CREATE table test (
id integer,
x integer
);
INSERT INTO test VALUES (1, 1);
SELECT works:
WITH res AS (
UPDATE test SET x = 10 WHERE id = 1
RETURNING id
)
SELECT id FROM test WHERE ...
0
votes
1answer
54 views
How to deal with different badges in Postgres Explain Visualizer?
I've been working with several DBMS during my career, but always Oracle/Sql Server/MySql. Now I have to deal with PostgreSQL and my first task is to tune several queries to speed them, as our DB is ...
-1
votes
1answer
21 views
DBD::Pg::st execute failed: ERROR: canceling statement due to user request
I am using postgresql with pgadmin, I am getting following error
DBD::Pg::st execute failed: ERROR: canceling statement due to user request
CONTEXT: SQL statement "TRUNCATE mystats_na_apple....
0
votes
2answers
40 views
Does enabling pg_stat_statements reduce disk space?
Recently I was informed that since enabling pg_stat_statements, the available disk space is dropping fast. I don't think it's caused by that, but I wonder: Does enabling pg_stat_statements reduce disk ...
0
votes
1answer
22 views
pg_restore fails with drop default on identity column
Trying to restore a Postgres 10.6 database via pg_restore, and it seems to want to do a DROP DEFAULT when it should be doing a DROP IDENTITY during the clean phase. See below:
pg_restore --verbose -...
1
vote
2answers
37 views
copy entire PostgreSQL cluster to another (identical) server
I'm looking to clone a PostgreSQL 10 cluster from server1 to server2, which is running the same Postgres version on identical hardware. The purpose is load-balancing and HA. Things to keep in mind:
...
1
vote
1answer
32 views
Why disable Postgres Autovacuum?
I've got a task to work with a 9.6 Postgres DB, and for some reason Autovacuum is disabled.
The database was extremely slow, and after a manual VACUUM it could breathe again.
The point is, why ...
1
vote
1answer
17 views
How I can find out the foreign wrapper that a foreign table belongs to?
I have found that the following query lists all my foreign tables in my PostgreSQL database:
select * from information_schema."tables" where table_type='FOREIGN TABLE';
Now I want to find out the ...
1
vote
0answers
16 views
How to get db “state version seq” in postgres?
I need to run a script on every database change. The script works on diffs, so I need to know if I handled the previous state (the handler script could be down for some time for example).
One way I ...
0
votes
1answer
30 views
How to Calculate Month over Month User Retention based on already active users (not based on user signup date)?
I have a Table which tracks User activity (i-e user started a session at what time ?). This table contains the data from Dec 2018 Till now. I need to calculate monthly retention (not based on signup ...
0
votes
0answers
23 views
Single metadata base table in Postgres
I am a fan of adding timestamps to tables in the form of created_at, updated_at and deleted_at. But it can be tedious to add these fields to every table.
I was wondering, is it a bad design decision ...
0
votes
0answers
16 views
How to achieve this Nested Complex postgresql schema CRUD?
I'm trying to achieve this complex schema.
{
relation1_id : Number,
...
...
item_caption: [
{
caption: '',
subcaption: '',
products: [
{
...
0
votes
1answer
31 views
pg replication connection not returns wal events to java code client , it hangs some times
Describe the issue
We are facing issue of pg replication slot not listen database wal events.
Once pg database restarted and we attach
Driver Version: 42.2.6
Java Version: JDK1.8
OS Version: Window ...
0
votes
1answer
20 views
postgres function definition not saving top whitespace
For reference I am running postgres 9.6 . I'd like to write functions inside of postgres where the top of the function saves.
create or replace function
apqp.apqp_list_gentex_tool_report_getlist(...
