Questions tagged [timescaledb]
TimescaleDB is an open source time-series extension of PostgreSQL. Use this tag for questions related to TimescaleDB. Also tag with the more general "time-series-databases".
71
questions
0
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0
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24
views
postgresql with timescaledb backup/restore and upgrade issue
My customer is using TimescaleDB 2.3.1 at PostgreSQL 11.20. We are trying to upgrade PostgreSQL and Timescaledb currently
I installed PostgreSQL 13.11 and and TimescaleDB 2.11.0
I backedup the ...
- 15
0
votes
4
answers
116
views
Window function with subquery results to unexpectedly slow query plan
This is my victim query
SELECT *,
lag(quantity)
over (partition by product_id, size_id, warehouse_id order by size_id, warehouse_id, created_at ASC) -
quantity as orders
FROM ...
- 1
1
vote
1
answer
98
views
Error while creating continuous aggregate (materialized view) when source and new time columns have the same name (PSQL/TSDB)
I'm facing a problem when creating a continuous aggregate on timescaledb (based on materialized views) when the source time column and the new time column have the same name like below:
CREATE ...
- 257
0
votes
0
answers
5
views
js transform code applied to a postgres / timescale view
Let's assume this data type:
timestamp INT
ticker VARCHAR
price NUMERIC
with some example data:
0, A, 10
0, B, 100
1, A, 20
1, B, 1000
2, A, 30
2, B, 10000
...
And a JS function, implemented with ...
- 261
1
vote
1
answer
61
views
add_continuous_aggregate_policy does not exist, with timescale
One picture sums it all:
The function is part of the public schema, but is it not found; it happens whether I put 'public.' or not in front of the function name.
I'm using DataGrip and the ...
- 261
0
votes
0
answers
24
views
how to make joins on different tables based on the data retrieved, with TimeScale/Postgres
Here is a simplified version of the problem I'm trying to solve:
Table A with id and some data:
id, data
A01, xxxx
A02, xxxx
...
Table B with id and some other kind of data
id, data
B01, xxxx
B02, ...
- 261
1
vote
1
answer
210
views
Unnest array of rows with a tagged column
I'm trying to create a query that will return data in this format:
id
time
value
1
1
2.5
1
2
3.5
1
3
6.4
2
1
8.3
2
2
8.5
I'm using Timescaledb and wish to use one of their downsampling ...
- 135
0
votes
1
answer
107
views
Move timescaledb hypertable from a postgresql server to another one
I want to move a timescaledb hypertable that's on the terabytes order. I wanted to do something like the following:
pg_dump -t "schema1"."table1" -h host1_ip -U username1 dbname1 | ...
- 257
0
votes
0
answers
81
views
Materialized view slow with Timescale
I have a table created like this:
-- enable timescale plugin
CREATE EXTENSION IF NOT EXISTS timescaledb CASCADE;
-- create schema
CREATE SCHEMA IF NOT EXISTS {schemaName};
-- create table
CREATE ...
- 261
1
vote
1
answer
491
views
How to determine which foreign keys are circular? As highlighted by warning from pg_dump
When carrying out pg_dump on a (timescale) database running within a local container I have the following:
pg_dump: warning: there are circular foreign-key constraints on this table:
pg_dump: ...
- 256
2
votes
2
answers
598
views
How to interpret "transactions per second"?
Short version: When I execute one transaction in IntelliJ, the "transactions per second" graph increases by 10 tx/sec - I only expect it to increase by 1.
So, it seems that my understanding ...
- 233
0
votes
0
answers
157
views
Postgres and CopyManager, Database connection failed when starting copy at org.postgresql.core.PGStream.receiveChar
I'm trying to run copy mananger and load CSV file
val pgConnection = conn.unwrap(classOf[PgConnection])
val copyManager = new CopyManager(pgConnection)
val fis = new FileInputStream(tempTsvFilePath....
- 123
0
votes
1
answer
71
views
Database to save measurements
I am creating an infrastructure to save measurements coming from a fleet of around 2000 cars.
Each car contains about 60 sensors (depending from car) with a sum of about 800 values par second coming ...
- 1
5
votes
3
answers
133
views
Select telemetry data based on relational data in PostgreSQL/TimescaleDB
I'm trying to solve a particularly difficult problem. I am storing some telemetry data from some sensors in an SQL table (PostgreSQL) and I want to know how I can I write a query that will group the ...
- 81
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votes
0
answers
202
views
TimescaleDb : How to store long time events?
I’m trying to use TimescaleDb to store long time events (events started for example 2 days ago and ended 1 hour ago).
There are two types of events (current events without end date and historical ...
3
votes
1
answer
407
views
I can't understand a syntax error issue in SQL / TimeScaleDB
This does NOT compile:
SELECT add_compression_policy(
hypertable => 'exchange.candles',
compress_after => INTERVAL ((SELECT now()::DATE::timestamp - (SELECT min(last_ts) FROM exchange....
- 261
2
votes
1
answer
379
views
A complicated scenario with TimescaleDB and compression
We have a timescaleDB with a fairly large data set (> 1.5TB, >1B rows).
The project has been running into one delay after another because we just can't make the queries we need to perform fast ...
- 261
1
vote
0
answers
291
views
Improve TimescaleDB aggregate query execution time
Schema
The following database schema is realized in a PostgreSQL 14.2 database with TimescaleDB 2.5.1:
Indexes on tables exist for primary and foreign keys. As an example, this is the output of \d ...
- 171
0
votes
2
answers
236
views
How to check whether TimescaleDB view is defined `WITH DATA` or `WITH NO DATA`?
TimescaleDB materialized view can be created with or without DATA.
Normal Postgres way to check view definition does not have trailing pragmas including DATA.
# \sv wmd
# select pg_get_viewdef('wmd', ...
- 103
2
votes
2
answers
342
views
Slow query for multiple data at same timestamp
Hi everyone,
I'm currently facing a problem to query efficiently my database to retrieve all rows at same timestamp.
I will explain,
I have two table of data using TimescaleDb Hypertable with ...
- 31
2
votes
2
answers
145
views
PostgreSQL (TimescaleDB) asynchronous replication (WAL) doesn't work
I'm trying to setup asynchronous replication of a PostgreSQL (TimescaleDB) database. I've been following numerous of guides, and even after trying things from documentation it doesn't seem to work. I ...
- 21
2
votes
2
answers
293
views
Index not picked up on nullable boolean column
I have 2 TimescaleDB Databases (PROD and DEV), both have a hypertable with the same schema and almost the same data (44M rows for the first one, 40M for the 2nd one).
I have to query some data on a ...
- 23
2
votes
2
answers
411
views
Wall clock hourly buckets out of time intervals with postgres or timescale
I have a record of session durations with start and end timestamps:
user_id | session_id | session_start | session_end
--------+------------+-------------------------------+------------...
- 123
0
votes
0
answers
561
views
Installing older versions of timescaledb for postgresql on macos
I'm running postgresql 14.1 on MacOs Monterey, this was installed as a requirement of timescaledb which is at version 2.5.1.
I had issues while installing timescaledb with another version of ...
- 11
3
votes
0
answers
411
views
Improve performance of view based on TSDB continuous aggregation
I am currently trying to create a (materialized) view which is based on a TSDB (timescale DB) continuous aggregation. Some context:
I have a table which takes consumption data of meters through a ...
- 31
1
vote
0
answers
105
views
How to speed up GroupAggregate
https://explain.depesz.com/s/I2IN
I have a query against a TimescaleDB 1.7 hypertable on Postgresql 12.
Lots of joins to other table. When I do the grouping it seems to take a lot of time, I switched ...
- 189
3
votes
1
answer
405
views
Is it ok or how to backfilling an uncompressed hypertable in TimescaleDB?
For PostgreSQL (v13.4) with TimescaleDB (v2.4.1)
Created a hyper table, with each day as a chunk, and I found a day in last month is missing, so I've inserted those data of the missing day into the ...
- 223
1
vote
2
answers
812
views
parallelize select/insert for postgresql
I have a relatively big postgresql table (timescaleDB), 200GB ~ 1B rows, index by timestamp and id. I realize a lot of times, my very task is only handled by 1 process. I believe my query can be split ...
- 121
2
votes
1
answer
243
views
Are out of order inserts an issue?
I am running a PostgreSQL database that is logging state-of-health information for a number of systems. At the moment, it is running on a standard PostgreSQL server, but it seems like TimescaleDB has ...
- 251
1
vote
0
answers
158
views
timescaleDB insertion speed issue
I’m trying to use pandas to interact with timescaleDB. I initiate my DB in DBeaver with the following
CREATE TABLE db_009a005a_df_downloaded_grand (
symbol VARCHAR(32),
timestamp TIMESTAMP ...
- 155
2
votes
1
answer
477
views
TimescaleDB on Azure Postgres error when creating continuous aggregation
I am getting the following error
SQL Error [0A000]: ERROR: functionality not supported under the current license "ApacheOnly", license¶ Hint: Upgrade to a Timescale-licensed binary to ...
- 123
2
votes
0
answers
187
views
How to optimize for performance when querying millions of rows in real-time analytics?
Suppose I have a simple table called events like this:
timestamp
event_id
action_count
apr 5 01:05:00
foo
10
apr 5 01:04:15
bar
20
apr 5 01:06:10
baz
200
apr 5 01:04:30
baz
5
apr 5 01:03:00
baz
...
- 121
2
votes
1
answer
764
views
timescaledb: Bulk insert exhausts all memory
Summary
I am attempting to insert data into a timescaledb hypertable in bulk. Regardless of what I try, the memory usage grows gradually until the server process is killed due to a lack of memory. I ...
- 123
2
votes
1
answer
1k
views
Can't do simple query or drop table due to out of memory error, but pg_locks return no lock
I received this out of memory error when trying to drop a large table (70GB including index) but couldn't identify the root cause from pg_locks view
DROP TABLE big_table;
ERROR: out of shared memory
...
- 21
0
votes
1
answer
142
views
How to quickly return the number of rows in a distributed hypertable with more than 100 million rows in TimescaleDB?
In a 'vanilla' PostgreSQL 12.7 database, I generally run the following query to learn the estimated number of rows in tables with 100+ million rows:
----------------------------------------------------...
- 189
1
vote
1
answer
369
views
Database architecture of high frequency sensor values
I have a lot of sensors (around 1000) and want to save their values. The sensors
will mostly work around a sampling rate of 10Hz.
Regular queries will be used for a live-view application. It can be ...
1
vote
1
answer
1k
views
PostgreSQL does not start: FATAL: xlog flush request is not satisfied --- flushed only to 0
I have a Docker PostgreSQL (TimescaleDB) developer instance with a local Linux volume mapping.
version: '3'
services:
dex-timeseriesdb:
image: timescale/timescaledb:latest-pg12
# https://...
- 289
2
votes
1
answer
153
views
TimescaleDB database design - should I use inheritance?
I have the following TimescaleDB hypertable:
CREATE TABLE public.data
(
event_time timestamp with time zone NOT NULL,
pair_id integer NOT NULL,
entry_id bigint NOT NULL,
event_data1 ...
- 247
2
votes
2
answers
2k
views
Converting PostgreSQL table to TimescaleDB hypertable
I have a PostgreSQL table which I am trying to convert to a TimescaleDB hypertable.
The table looks as follows:
CREATE TABLE public.data
(
event_time timestamp with time zone NOT NULL,
...
- 247
0
votes
1
answer
1k
views
postgres read query resample time series data for hourly averages
I am new to SQL trying to learn how to do read queries on time series data. Can someone give me a tip on how to resample interval time series data to hourly averages on the postgres read query?
My ...
- 103
5
votes
1
answer
236
views
Non-deterministic performance of query on select, from 1s to 60s on table with 1 billion rows
I'm trying to investigate why the performance of this query is so non-deterministic. It can take anywhere from 1 seconds, to 60 seconds and above. The nature of the query is to select a "time ...
- 53
2
votes
0
answers
864
views
Multiple tables vs rows for timescaledb / postgresql
I am designing a postgresql/timescale database where I will be recording trades on multiple stocks. For each stock I will be saving the following columns: Trade time, Attribute 1, Attribute 2, ...
- 247
2
votes
0
answers
34
views
How do I know which timescale db docker image was used?
I see timescaledb.last_tuned_version = '0.8.0' in postgresql.conf. How can I know which docker timescaledb image (exact version) was used?
- 153
-1
votes
1
answer
212
views
TimescaleDB wildcard (%) slow
I have a timescaledb hypertable like this:
create table logs
(
time timestamp not null,
partitionkey text not null,
ip inet,
raw text,
transformed ...
- 5
3
votes
2
answers
896
views
On docker volume restore: could not access file "$libdir/timescaledb-1.6.0": No such file or directory
I am trying to restore TimescaleDB data from one ubuntu machine to another ubuntu machine. On the both machines we have deployed TimescaleDB through docker and using the same tag.
Docker image used: ...
- 153
1
vote
1
answer
123
views
TimescaleDB distributed setup strategy
What is the best setup strategy for TimescaleDB?
My initial thoughts based on the TimescaleDB FAQ was that it is indeed recommended and possible to basically have one database that contains both time ...
- 189
1
vote
2
answers
388
views
Optimizing table for timeseries Postgres data table
I have the below table which maintains a timeseries result. The row only becomes relevant when the signal is true, When signal is false, it just marks that for that particular timestamp we got a ...
- 123
0
votes
1
answer
97
views
First metric in each time "bucket" for multiple IDs
I have the following table in PostgreSQL 12:
CREATE TABLE vehicle_fuel (
vehicle_id int NOT NULL
, submitted_at timestamp NOT NULL
, fuel float NOT NULL);
Currently there are ...
- 1
1
vote
1
answer
359
views
Postgres: Why is my delete query using up all available disk space?
I have a postgres table set up like so:
Table "public.facts"
Column | Type | Collation | Nullable | ...
1
vote
2
answers
2k
views
High autovacuum CPU/IO usage from database with more than 10k append-only tables
In my system I have more than 10k tables that are very similar, I only do insert operations in these tables and delete old data via a cron schedule one time per day.
These insertions come each minute, ...
- 125