Upgrade to 2023.4.4 (with mariadb), no more history, slow queries on db, is it the migration?

bdraco · April 18, 2023, 7:29am

Schema for 2023.4.5

-- MariaDB dump 10.19  Distrib 10.11.2-MariaDB, for osx10.18 (arm64)
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-- Host: localhost    Database: fresh
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-- Server version	10.11.2-MariaDB

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-- Dump completed on 2023-04-17 21:28:40
bdraco@MacBook-Pro-3 ~ % mysqldump -d fresh
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  KEY `ix_statistics_runs_start` (`start`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
/*!40101 SET character_set_client = @saved_cs_client */;

--
-- Table structure for table `statistics_short_term`
--

DROP TABLE IF EXISTS `statistics_short_term`;
/*!40101 SET @saved_cs_client     = @@character_set_client */;
/*!40101 SET character_set_client = utf8 */;
CREATE TABLE `statistics_short_term` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `created` datetime(6) DEFAULT NULL,
  `created_ts` double DEFAULT NULL,
  `metadata_id` int(11) DEFAULT NULL,
  `start` datetime(6) DEFAULT NULL,
  `start_ts` double DEFAULT NULL,
  `mean` double DEFAULT NULL,
  `min` double DEFAULT NULL,
  `max` double DEFAULT NULL,
  `last_reset` datetime(6) DEFAULT NULL,
  `last_reset_ts` double DEFAULT NULL,
  `state` double DEFAULT NULL,
  `sum` double DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `ix_statistics_short_term_statistic_id_start_ts` (`metadata_id`,`start_ts`),
  KEY `ix_statistics_short_term_start` (`start`),
  KEY `ix_statistics_short_term_start_ts` (`start_ts`),
  CONSTRAINT `statistics_short_term_ibfk_1` FOREIGN KEY (`metadata_id`) REFERENCES `statistics_meta` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;
/*!40101 SET character_set_client = @saved_cs_client */;
/*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;

/*!40101 SET SQL_MODE=@OLD_SQL_MODE */;
/*!40014 SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS */;
/*!40014 SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS */;
/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;
/*!40111 SET SQL_NOTES=@OLD_SQL_NOTES */;

-- Dump completed on 2023-04-17 21:28:42

Note that AUTO_INCREMENT will need to be adjusted

catsmanac · April 18, 2023, 8:30am

My case solved itself in time. This morning history-graph performed as before. Turns out that dropping indexes was still going on, even after the schema upgrade notification was removed and completion of scema 41 was in the log. Couple of seconds after upgrade to 41 was done a dropping index message showed.

2023-04-16 18:30:47.220 WARNING (Recorder) [homeassistant.components.recorder.migration] Database is about to upgrade from schema version: 35 to: 41
.
.
2023-04-16 18:49:48.033 WARNING (Recorder) [homeassistant.components.recorder.migration] Upgrade to version 41 done
2023-04-16 18:49:55.826 WARNING (Recorder) [homeassistant.components.recorder.migration] Dropping index `ix_states_event_id` from table `states`. Note: this can take several minutes on large databases and slow computers. Please be patient!
.
.
2023-04-16 18:52:39.058 WARNING (Recorder) [homeassistant.components.recorder.migration] Dropping index `ix_events_context_id` from table `events`. Note: this can take several minutes on large databases and slow computers. Please be patient!
.
.
2023-04-17 06:54:25.342 WARNING (Recorder) [homeassistant.components.recorder.migration] Dropping index `ix_states_context_id` from table `states`. Note: this can take several minutes on large databases and slow computers. Please be patient!
.
.
2023-04-17 20:34:44.577 WARNING (Recorder) [homeassistant.components.recorder.migration] Dropping index `ix_states_entity_id_last_updated_ts` from table `states`. Note: this can take several minutes on large databases and slow computers. Please be patient!

That was last entry in log. It might still be active on the last drop, but history-graph works fine again. States indexes:
afbeelding

bdraco · April 18, 2023, 8:35am

After the schema migration finishes it will reorganize the database in the background and than drop any indexes that it doesn’t need anymore. It does this in batch jobs like purge does so its like any other database job except its going to do more I/O.

catsmanac · April 18, 2023, 8:37am

Thanks for the explanation. Will there be some log entry when it’s done as with schema migration?

bdraco · April 18, 2023, 8:39am

Normally background jobs aren’t logged (there are A LOT of them), but if you set homeassistant.components.recorder to debug logging you’ll be able to see it.

wouf · April 18, 2023, 8:54am

Thank you.

I have many many differences missing indexes and foreign keys. I will rollback to 2023.3 and retry a migration. Something obviously went wrong in the first place.

bdraco · April 18, 2023, 9:17am

If you create a fresh database and point your 2023.3.x instance at it, it will make fresh schema.

If you fix any incorrect schema when still on 2023.3 before upgrading to 2023.4.x the upgrade should go much smoother

wouf · April 18, 2023, 11:22am

As mentionned in the issue, I did the rollback and new update, and everything is running smoothly now.

Thanks for your help.

HA_n00b · April 18, 2023, 12:53pm

Nick, do you think that we should put some effort to migrate back from MariaDB to SQLite?

Or, is it OK to stay with MariaDB?

I saw people doing migration to SQLite, but for me the process is a bit complex and there’s chance of loosing data. Thinking to stay with MariaDB, but…

So, what’s your experts opinion on this?

bdraco · April 18, 2023, 6:15pm

Its ok to stay on MariaDB if you are comfortable being the database admin and handling anything that goes wrong. If you are running the official addon with default settings, its likely not well tuned for your system. If you haven’t done the tuning yourself already or aren’t comfortable being in the DBA role you should probably migrate back to SQLite.

nkgiovannivl · April 21, 2023, 4:16am

Hi All,

I’m getting missing information on states table :

Using local add-on of MariaDB and PHP My Admin, even with a external MariaDBs too.

Try delete all DBs and restart like a new, but it does not help…

bdraco · April 21, 2023, 5:43am

entity_id is stored in states_meta in schema 41. Which means its only stored once per entity which is what enabled rename support in 2023.4.x (and a whole lot smaller states table)

nkgiovannivl · April 21, 2023, 4:46pm

Thanks!!! @bdraco I’ll be update my querys including this INNER JOIN, but just for curiosity, is there some link or document explaining schema information and tables relation? I was googling but I can not find any formal.

bdraco · April 21, 2023, 6:43pm

Examples linked in the release notes and here https://data.home-assistant.io/

dproffer · April 21, 2023, 7:53pm

Querying has gotten a bit more complex with these recent releases. Below is an example of getting the last day of changes to a sensor, regardless whether the state or attribute changed (old query shown below new). I use Postgresql, not Mariadb so your SQL syntax will probably be different. I have a lot of queries to update… Good hunting!

-- get freezer temperature for last 24 hours
SELECT
    states.state,
    to_char(to_timestamp(states.last_updated_ts), 'YYYY-MM-DD HH24:MI:SS') AS last_updated_ts,
    to_char(to_timestamp(states.last_changed_ts), 'YYYY-MM-DD HH24:MI:SS') AS last_changed_ts,
    state_attributes.shared_attrs,
    states.context_id_bin
FROM
    states
    LEFT JOIN states_meta ON (states.metadata_id = states_meta.metadata_id)
    LEFT JOIN state_attributes ON (states.attributes_id = state_attributes.attributes_id)
WHERE (states_meta.entity_id = 'sensor.freezer_govee_temperature'
    AND to_timestamp(states.last_updated_ts) > now() - interval '1 days')
ORDER BY
    states.last_updated_ts DESC;

SELECT
    *
FROM
    states
WHERE (entity_id = 'sensor.freezer_govee_temperature'
    AND last_updated > now() - interval '1 days')
ORDER BY
    last_updated DESC;

nkgiovannivl · April 21, 2023, 8:14pm

More complex, but I supposed that is the price to pay in order to reduce the DB size (more relational), by the way nice example! Thanks!

nkgiovannivl · April 21, 2023, 8:19pm

Wowwwww it’s everything!! Thanks a lot!

wouf · April 22, 2023, 9:15am

I’m experiencing the problem again after migrating from 2023.4.5 to 2023.4.6. That’s frustrating.

I’m rolling back to 2023.4.5

noxius999 · August 27, 2024, 5:38am

For anyone who has problem with mariadb recorded. I have to add indexes to tables (my schema version was at 45, but was missing indexes). I had missing ix_events_context_id_bin, ix_events_context_id in tables events,states and for some reason i have ix_events_event_type_id_time_fired_ts as non visible index, so it was not allowed to use directly in SQL.

So i have to:

add missing keys in states from schema above
make sure that keys are visible
read system logs for other database schema differences

YordiDR · September 7, 2024, 8:30pm

Hi, could you share the SQL queries to fix this? I’ve got the same issue but I’m not up to date on how indexing is configured.

Thanks in advance!