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Questions tagged [vacuum]

In SQLite and PosgreSQL, the VACUUM command rebuilds the entire database.

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How posgreSQL marks frozen rows?

I'm studying the VACUUM command. In particular how it solves the wrap around problem. Basically every transaction has associated a transaction ID. Every row has associated the transaction ID of the last transaction that has updated/inserted it. The…
SGiux
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is it safe to run vacuum analyze on a read replica?

i have logical replication setup on AWS RDS from a PG 9.5 primary to a PG 12.3 read replica via AWS DMS. (fyi the replica session_replication_role is set to "replica".) query plans are not optimized on the PG 12.3 read replica and even basic…
Robert Locke
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Postgres vacuum/demon partially working when issued from JDBC

First of all I know it's odd to rely on a manual vacuum from the application layer, but this is how we decided to run it. I have the following stack : HikariCP JDBC Postgres 11 in AWS Now here is the problem. When we start fresh with brand new…
Alex
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How to fix "UNIQUE constraint failed" from VACUUM (also INTEGRITY_CHECK fails)

I use an app which creates this SQLite DB with this table: CREATE TABLE expense_report (_id INTEGER PRIMARY KEY, ...) And for some reason that _id (which is the ROWID) became invalid in that DB. When I scan the table I see that the last rows got an…
Mariano Desanze
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Postgresql auto-vacuuming taking too long

I have db table which has around 5-6 Mn entries and it is taking around 20 minutes to perform vacuuming. Since, one field of this table is updated very frequently, thereare a lot of dead rows to deal with. For an estimate, with our current user base…
hardik24
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Query on statistics shown on pg_stat_progress_vacuum

I'm trying to understand what the below parameters mean: max_dead_tuples / num_dead_tuples on the pg_stat_progress_vacuum view. From the Postgres documentation: max_dead_tuples bigint Number of dead tuples that we can store before needing to…
RMu
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Cloud PostgreSQL clean large objects vacuumlo

We are managing to use GCP CloudSQL for our PostgreSQL database, at this moment one of our applications uses large objects and i was wondering how to perform a vacuumlo operation on such platforms (question might be valid for AWS RDS or any other…
kappa
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How to change sqlite3_temp_directory?

I was trying to VACUUM my database and got the following error: "org.sqlite.SQLiteException: [SQLITE_FULL] Insertion failed because database is full (database or disk is full)" According to…
kyabhft
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Syntax Error using Vacuum Into on Android

I'm trying to make a backup of a database in an Android application, and I was pointed to the VACUUM INTO query. However, when I try to call it, I get a syntax error around "INTO": Caused by: android.database.sqlite.SQLiteException: near "INTO":…
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Free up storage space after VACUUM ANALYZE

I need to free up the storage space after VACUUM ANALYZE is executed. I know that there's VACUUM FULL but the problem with this is, it locks the table which might cause problems (if there are on going transactions). Is there any other way to free up…
mengmeng
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How to execute a vacuum command without warning stops in postgres?

Attempting to vacuum as postgresql database, but it stops after vacuuming about 50 records, with this command/warning: backend> vacuum FULL; WARNING: database "postgres" must be vacuumed within 988308 transactions HINT: To avoid a database…
kmiklas
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Full Load in Redshift - DROP vs TRUNCATE

As part of daily load in Redshift, I have a couple of tables to drop and full load all of them, (data size is small, less than 1 million). My question is which of the below two strategies is better in terms of CPU utilization and memory in…
varun
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How to ensure that the autovacuum daemon is running in my PostgreSQL Docker Container?

I am benchmarking my database running in a Docker container against fragmentation issues and found out that the autovacuum daemon is not running. SELECT schemaname, relname, last_vacuum, last_autovacuum, vacuum_count, autovacuum_count …
Natalie Perret
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VACUUM causes disk to run a 100% - Is it normal and, can I prevent it?

I currently have a 9Gb Sqlite3 database, I have a 'maintenance' task that runs at random intervals in the evening to VACUMM; the database, (on average about once a week). The database is on a Windows 10 machine. One morning I saw that the task was…
Simon Goodman
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Autovacuum not removing dead rows (and xmin horizon doesn't match xmin of any session)

I have a table with 85% dead rows which is giving me trouble. I executed VACUUM (VERBOSE) MY_TABLE as per this SO response and according to the results, no active session is currently holding my xmin horizon back (so I don't see which session I…
Daniel
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