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".

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5 votes
3 answers
74 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 ...
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0 votes
0 answers
44 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
128 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....
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2 votes
1 answer
65 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 ...
  • 217
1 vote
0 answers
138 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 ...
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0 votes
2 answers
65 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', ...
1 vote
2 answers
108 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 ...
2 votes
2 answers
87 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 ...
2 votes
2 answers
99 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 ...
2 votes
2 answers
194 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
277 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 ...
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3 votes
0 answers
225 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 ...
1 vote
0 answers
68 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 ...
  • 179
3 votes
1 answer
278 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 ...
  • 189
1 vote
2 answers
90 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
1 vote
1 answer
136 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 ...
1 vote
0 answers
74 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 ...
2 votes
1 answer
282 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 ...
2 votes
0 answers
143 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 ...
  • 21
2 votes
1 answer
319 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
1 vote
1 answer
810 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 ...
  • 11
0 votes
1 answer
68 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: ----------------------------------------------------...
1 vote
1 answer
193 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
597 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://...
2 votes
1 answer
119 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 ...
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2 votes
2 answers
995 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, ...
  • 237
0 votes
1 answer
652 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
161 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
638 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, ...
  • 237
2 votes
0 answers
24 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?
-1 votes
1 answer
155 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
626 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: ...
1 vote
1 answer
96 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 ...
  • 179
1 vote
2 answers
261 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 ...
0 votes
1 answer
58 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
210 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
1k 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
0 votes
0 answers
391 views

PostgreSQL query takes hours instead of seconds after adding one row in a referenced table

I'm new to the database world and I think I'm missing some basic understanding of my issue. It seems to me this is a conceptual issue. I have a table 'data' with the Timescaledb extension. The column '...
  • 1
1 vote
1 answer
2k views

Postgres optimizing join of 2 large tables

I have 2 tables one with around 1M entries and other around 4M. I want to join these tables in a materialized view. But the materialized view creation is taking too long ~4 hours. I don't see the ...
0 votes
0 answers
119 views

Space concerns for unique constraint on row for time-series db (PostgreSQL / TimescaleDB)

I was wondering if there is a more space-efficient way of doing unique row constraints on time-series DBs. Adding a normal unique key for the entire row will result in an index the same size or ...
  • 123
0 votes
1 answer
21 views

Add aggregated value filtered by a condition to existing query

I have this table to collect data from IoT device: CREATE TABLE public.conferimenti ( id bigint NOT NULL DEFAULT nextval('conferimenti_id_seq'::regclass), codicestazione smallint NOT NULL, ...
0 votes
1 answer
642 views

Ways to optimize the PostgreSQL/TimeScaleDB query

What approaches I could take to optimize the performance of the following joinless query on the following PostgreSQL/TimeScaleDB table? So far, I managed to create the right index which is obviously ...
1 vote
1 answer
2k views

Unable to convert a table to hypertable due to unique index error

I am creating a table using Flask SQL Alchemy as follows: class Price(db.Model): __tablename__ = "prices" id = db.Column(db.Integer, primary_key=True) country_code = db.Column(db.String(2)...
  • 113
0 votes
0 answers
387 views

Splitting columns and getting result as a JsonArray in Postgresql

I have a table like this: Time | id/type | value 1 A/a 10 2 A/b 15 3 A/c 8 4 A/b 2 I need to get a Json Array in the format: [[Time, value for ...
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2 votes
1 answer
978 views

ZFS Tunings for PostgreSQL

What are the recommended ZFS tunings for PostgreSQL 11 (with TimescaleDB 1.6 extension) running on striped mirrored vdevs of SATA3 SSDs? I am considering: ashift=12 atime=off relatime=on (or off?) ...
  • 1,031
3 votes
1 answer
1k views

Find Uncompressed/Compressed Sizes of TimescaleDB Database/Table

For a database/table in TimescaleDB and PostgreSQL 11 running on ZFS with both ZFS compression and native TimescaleDB compression enabled, how can you find the uncompressed and compressed sizes when ...
4 votes
1 answer
399 views

Continuously Adding SSDs to an existing PostgreSQL Server

An Ubuntu 18.04 server dedicated to running a PostgreSQL 11.2 server (with TimescaleDB extension) will be running out of disk space soon so new SSD disks will need to be added to the machine to ...
  • 1,031
0 votes
0 answers
95 views

How does Timescale assign chunk ids?

Timescale allows us to query for chunk sizes in with something like SELECT * FROM chunk_relation_size('....'); I am trying to monitor the chunk sizes so that if any of them reaches a size that is ...
  • 113
2 votes
0 answers
540 views

Backing up Time Series Database (PostgreSQL/TimescaleDB) where old data will never be updated

If a PostgreSQL (using TimescaleDB extension) database that holds time series data is continuously growing in size, what is the recommended backup strategy if we do not want to continuously create ...
  • 1,031
0 votes
0 answers
282 views

How to use timescale-bitnami image on Windows?

Since there are issues with collations in the default alpine-based timescaledb images, I tried to use the bitnami-image. But I get an error on startup. docker run ^ -p 5432:5432 ^ -v tsdb-bitnami:/...
  • 251