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Wednesday, September 16, 2020

Deleting timeseries of deleted ThingsBoard entities

    As of ThingsBoard v.2.5.4/3.1.1, telemetry and attributes of entities are not automatically deleted when entities themselves are deleted, which causes performance degradation (because of decreasing query speed) and filling up of the disk space . Lower are queries for the PostgreSQL database to delete telemetry and attributes.

    Deleting timeseries of previously deleted entities:


 DELETE * FROM ts_kv WHERE entity_id NOT IN (SELECT id FROM device) AND entity_id NOT IN (SELECT id FROM asset) AND entity_id NOT IN (SELECT id FROM customer) AND entity_id NOT IN (SELECT id FROM tenant) AND entity_id NOT IN (SELECT id FROM entity_group) AND entity_id NOT IN (SELECT id FROM integration) AND entity_id NOT IN (SELECT id FROM converter) AND entity_id NOT IN (SELECT id FROM entity_view) AND entity_id NOT IN (SELECT id FROM tb_user) AND entity_id NOT IN (SELECT id FROM dashboard) AND entity_id NOT IN (SELECT id FROM rule_chain) AND entity_id NOT IN (SELECT id FROM role); 

    Deleting attributes of previously deleted entities:


 DELETE * FROM attribute_kv WHERE entity_id NOT IN (SELECT id FROM device) AND entity_id NOT IN (SELECT id FROM asset) AND entity_id NOT IN (SELECT id FROM customer) AND entity_id NOT IN (SELECT id FROM tenant) AND entity_id NOT IN (SELECT id FROM entity_group) AND entity_id NOT IN (SELECT id FROM integration) AND entity_id NOT IN (SELECT id FROM converter) AND entity_id NOT IN (SELECT id FROM entity_view) AND entity_id NOT IN (SELECT id FROM tb_user) AND entity_id NOT IN (SELECT id FROM dashboard) AND entity_id NOT IN (SELECT id FROM rule_chain) AND entity_id NOT IN (SELECT id FROM role); 

    However, in PostgreSQL deleted rows are not physically removed from the table, they remain present until the VACUUM command is done, as described here: https://www.postgresql.org/docs/11/sql-vacuum.html. In order to reclaim the disk space VACUUM commands with ANALYZE parameter (for statistics refreshing) needs to be executed:


 VACUUM ANALYZE attribute_kv; 

    And if reclaiming space is critical, the parameter FULL should be added (please note that it requires as much free disk space as the table currently takes up):


 VACUUM FULL ANALYZE attribute_kv; 

    In order to find the list of telemetry tables to be VACUUM’ed, the following command needs to be executed:

SELECT table_name FROM information_schema.tables WHERE table_schema = 'public' AND table_name like 'ts_kv%' ORDER BY table_name; 

    Then the resulting list of tables is put in the VACUUM ANALYZE command:

    In this example the command looks like this:

VACUUM FULL ANALYZE ts_kv, ts_kv_2004_01, ts_kv_2020_08, ts_kv_2020_09, ts_kv_dictionary, ts_kv_indefinite, ts_kv_latest; 

    Please be aware that:

1.You need to put the list of tables from the output of the previous SELECT query, not just copy the previous VACUUM command.

2.Tables are not available when you perform a VACUUM command (all incoming read and write queries are put in a queue), so the best solution would be to perform it in the (at least relative) downtime.



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    In ThingsBoard, when an entity (e.g. device, asset, customer, etc.) is deleted, all of its related data is marked as deleted but not immediately removed from the database. This is because there might still be references to this data from other parts of the system or from backups.

    To delete the time series data of a deleted entity, you can follow these steps:

    Find the ID of the deleted entity. You can do this by going to the "Deleted Entities" section in the ThingsBoard UI and searching for the entity by name or ID.

    Once you have the ID of the deleted entity, you can use the ThingsBoard REST API to delete its time series data. Here is an example curl command:

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    curl -X DELETE 'http://localhost:8080/api/plugins/telemetry/DELETED_ENTITY_TYPE/DELETED_ENTITY_ID/timeseries/delete?deleteAllData=true' \
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    -H 'X-Authorization: Bearer YOUR_AUTH_TOKEN'
    Replace DELETED_ENTITY_TYPE and DELETED_ENTITY_ID with the type and ID of the deleted entity, respectively. Replace YOUR_AUTH_TOKEN with a valid ThingsBoard JWT token.

    The deleteAllData=true parameter is optional and specifies that all data should be deleted, including the data that was marked as deleted but not yet removed.

    After running the curl command, the time series data of the deleted entity should be deleted from the database. You can verify this by checking the "Data Explorer" section in the ThingsBoard UI.
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  33. In ThingsBoard, managing time series data for deleted entities involves ensuring that historical data associated with those entities is also removed to maintain data integrity and optimize storage. Here are the general steps to delete time series data for deleted ThingsBoard entities.
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  40. To delete the time series data of deleted ThingsBoard entities, you will need to access the database where ThingsBoard stores this information. Before proceeding, make sure to back up your database to prevent data loss in case of errors during the deletion process. Identify the specific tables or data storage structures in the database that contain the time series data. This data is typically organized by entity ID or another unique identifier.
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  43. truck accident injury lawyer The message addresses a technical issue with ThingsBoard version 2.5.4/3.1.1, which automatically deletes telemetry and attributes when entities are deleted. It provides a solution by offering specific queries for the PostgreSQL database to manually delete these attributes. The message is clear and informative, but could be improved by providing context or background information about the issue. Overall, it is helpful for users using ThingsBoard.

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  58. When managing a timeseries within the ThingsBoard platform, the process of deleting entities can be critical for data management and system efficiency. Deleting ThingsBoard entities, such as devices or assets, often necessitates the removal of associated timeseries data to maintain data integrity and prevent clutter. This operation ensures that the historical records tied to these deleted entities are systematically purged, preventing obsolete or irrelevant data from affecting analytics and storage efficiency.
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  60. The text provides a detailed set of SQL commands for handling data deletions and reclaiming disk space in ThingsBoard and PostgreSQL. The steps involve removing telemetry and attribute data associated with deleted entities from the ts_kv table and attribute_kv table, and using VACUUM commands to reclaim disk space. For critical space reclamation, VACUUM FULL ANALYZE should be used. The review comments emphasize the importance of maintaining the maintenance window during downtime or low-usage window, ensuring VACUUM command accuracy, and cautioning about the FULL option in VACUUM, which requires substantial free disk space and may cause additional load during execution. Post-operation checks are recommended to ensure expected disk space reclamation and system performance improvements. The text also recommends data integrity and backup, scheduled maintenance, monitoring and alerts, documentation and reporting, testing and validation, and clear communication among teams involved to coordinate maintenance tasks effectively and minimize disruptions. abogado de flsa

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  62. To delete time series data associated with deleted ThingsBoard entities, you can follow these steps using the ThingsBoard REST API. Here's a simple example using Python and the requests library. Online attorneys

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  76. To delete time series data associated with deleted entities in ThingsBoard, you can follow these steps:

    Identify Deleted Entities:
    First, identify the entities that have been deleted from ThingsBoard. This could include devices, assets, or other entities.

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    Access the time series data storage in ThingsBoard. This may involve connecting to the database or using ThingsBoard APIs to retrieve historical data.

    Query and Delete Time Series Data:
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