Questions tagged [vacuum]

1

votes
3

answer
2.8k

Views

JDBC postgres vacuum timeout

I'm trying to vacuum my Postgres database by running the following SQL instruction within Java: vacuum verbose analyze Sometimes it just seems to 'hang' is there any clean way to abort the process? I have tried SET statement_timeout TO XXXX But I get the error message 'VACCUM cannot run inside the...
deltanovember
1

votes
3

answer
41

Views

How to get the sum of FreeSpace of all the tables in a database

To Get all the user Table names in the database using: select relname from pg_stat_user_tables; relname ------- Table1 Table2 Table3 To Get the free space marked by vacuum of one table using: SELECT sum(avail) FROM pg_freespace('Table1'); sum ----- 1728 I want to get the total free space of all the...
Anushiya
1

votes
0

answer
45

Views

How can I see the temp files that Vacuum creates in SQLite while running

I've read the information about where SQLite puts the temp files while vacuuming (https://sqlite.org/tempfiles.html), but I can't find the file while vacuum is running. I looked in SQLite source and it appears the temp file name is vacuum_db.*, but a find or locate did not display anything. I also...
user1838913
1

votes
0

answer
185

Views

duplicate key value violates unique constraint “pg_statistic_relid_att_inh_index” while performing full vacuum on the database

While performing vacuum full, I have received the below highlighted error. Please guide me how to resolve this issue. ​/opt/postgres/9.2/bin/psql -p 5433 --username=cmuser cpcm -c 'VACUUM FULL ANALYZE;' ERROR: duplicate key value violates unique constraint 'pg_statistic_relid_att_inh_index' DET...
Raghavendra
1

votes
0

answer
70

Views

Which temp directory is used by SQLite VACUUM

When the SQLite VACUUM command is run pro grammatically, how to find which temporary directory is used while executing the command. I am using sqlite version 3.6.7 I have this question because I get the following exception. So I want to check and if possible change the temporary directory that is us...
Srinivasan
1

votes
1

answer
3.3k

Views

postgresql vacuum analyze many tables

I have a medium-size table (about 15 billion rows) that is made of roughly 200 sub-tables (i.e. each sub-table INHERITS the mother table, and there are constraint CHECKS to optimize the partitioning). The plpgsql code that loads each table also produces indexes on each of the sub-tables, but unfortu...
Pierre D
1

votes
1

answer
747

Views

Amazon Product API: Redirect to URL/ send parameter (postback) after Amazon sale

Using Amazon associates I advertise a link. How do I get a parameter back after a sale has been made? (cid) I want to redirect to a url after the conversion, or to shoot a parameter back to my site, so I can see which clicks converted. How do I do that? I look everywhere in Amazon's Associate (affil...
1

votes
1

answer
58

Views

Vacuum table while creating serial column

I have a very large table in my database and I am trying to create a serial column for it. The problem I think the table is being replicated while I am creating this serial, which there is no room for. First off is my assumption correct? Second is there a way I can create a serial and have a vacuum...
Eric Thomas
1

votes
1

answer
513

Views

fetch ItemId in Amazon Product Api using Rails Vacuum gem

I am integrating Amazon Product Api in my rails app. I am using the vacuum gem for this integration. There are two main pages. I am fetching the products through this code. requestd = Vacuum.new requestd.configure( aws_access_key_id: ENV['AWS_ACCESS_KEY_ID'], aws_secret_access_key: ENV['AWS_SECRET_A...
techdreams
1

votes
1

answer
151

Views

Fetch RelatedItems in Amazon Product Api using Rails 4 Vacuum gem

I am integrating Amazon Product Api in my rails app. The only thing remaining now is fetching related items list when I am performing the item_lookup operation. When I add RelatedItems in ResponseGroup like this: response = request.item_lookup( query: { 'ItemId' => params[:id], 'ResponseGroup' => '...
techdreams
1

votes
1

answer
3.3k

Views

How to efficiently vacuum analyze tables in Postgres

I had a huge query running on postgres and one of the join tables always did a sequential scan. The index on the column exists and postgres just didn't use it. I did a vacuum analyze and then postgres query plan immediately changes to doing an index scan. My question is what is the most efficient wa...
Ramanan
1

votes
1

answer
1.1k

Views

Postgres: toast table + space + vacuum

environment: postgres: 9.5 table: segmentation=> \d+ sourceTable; Table 'sourceTable' Column | Type | Modifiers | Storage | Stats target | Description -----------------------------+--------------------------+------------------------+---------...
Natalia
1

votes
2

answer
34

Views

Long running function locking the database?

Is it normal for a function to acquire a database-level lock that prevents auto vacuuming and index creation on totally unrelated tables? I've got a long-running stored procedure that reads from one table and writes SUM()/AVG() data to another table. During the execution of the script (which can tak...
KenHuffman
1

votes
1

answer
0

Views

Reclaim space from Core Data SQLite store with NSPersistentContainer?

My app implements a web cache using Core Data with an SQLite store (a bit like NSURLCache but with more control over what is cached and when it can be purged from the cache). I can purge old data from the cache when it gets too big, but of course this does not actually reduce the amount of storage...
Son of a Beach
1

votes
2

answer
479

Views

Wrong (?) Size of PostgreSQL table

I have a table with columns and constraints: height smallint, length smallint, diameter smallint, volume integer, idsensorfragments integer, CONSTRAINT sensorstats_idsensorfragments_fkey FOREIGN KEY (idsensorfragments) REFERENCES sensorfragments (idsensorfragments) MATCH SIMPLE ON UPDATE CASCADE ON...
user1414355
1

votes
2

answer
472

Views

How to get SQLite 'VACUUM' Progress

Is there a way to get the progress of sqlite 'VACUUM'?I am using this line of code here in Java: connection1.createStatement().executeUpdate('VACUUM'); The User(MySelf & I) has to wait from some seconds to some minutes,i know that the actual .db file is being overriten with the help of a journal fil...
GOXR3PLUS
1

votes
2

answer
1.5k

Views

Altering column type from int to bigint frees space?

I have table with an int type column, in a table of ~ 15 M rows. OS windows 7 and C disk (where postgres is installed) shows that: 59 GB free of 238 GB Then I changed this column type to bigint: ALTER TABLE mytable ALTER column col TYPE bigint; And now, C disk: 61 GB free of 238 GB How are 2 GB fr...
OTAR
1

votes
1

answer
206

Views

Free memory after Vacuum full?

I am running out of disk space on my database server. I have never executed a vacuum full and I'm hoping that vacuum full will free some space. Have you run vacuum full before, and if space was freed up, how much was it?
Manuel Drieschmanns
1

votes
2

answer
1.1k

Views

auto vacuum vs vacuum in postgresql

Postgresql has the functionality of Vacuum for recollecting the space occupied by dead tuples. Auto vacuum is on by default and runs according to the configuration setting. When I check the output of pg_stat_all_tables i.e. last_vacuum and last_autovacuum, autovacuum was never run for most of the t...
Simba
1

votes
1

answer
31

Views

What happens when I quit VACUUM in sqlite3?

I have a sqlite3 database > 34-GB. When I execute explicit VACUUM command for this db, the procedure takes too long time. So I want to know what happens when I force it to quit VACUUM task. Is it OK to think VACUUM as atomic transaction?
Sangwook Kim
1

votes
1

answer
541

Views

Dynamic data in postgresql

I intend to have a python script do many UPDATEs per second on 2,433,000 rows. I am currently trying to keep the dynamic column in python as a value in a python dict. Yet to keep my python dict synchronized with changes in the other columns is becoming more and more difficult or nonviable. I know I...
Nicholas Leonard
1

votes
3

answer
374

Views

What is the effect on record size of reordering columns in PostgreSQL?

Since Postgres can only add columns at the end of tables, I end up re-ordering by adding new columns at the end of the table, setting them equal to existing columns, and then dropping the original columns. So, what does PostgreSQL do with the memory that's freed by dropped columns? Does it automatic...
Summer
1

votes
1

answer
1.5k

Views

sqlite vacuum with django

after insert and delete lots records into sqlite, the size of sqlite db file keeps growing, is there any way to use django vacuum the tables? some settings that let sqlite auto-vacuum or manually write own django command to vacuum Updated: I use sqlite database browser to execute following SQL: vacu...
pinkdawn
1

votes
1

answer
959

Views

SQLite vacuuming / fragmentation and performance degradation

Let's say I periodically insert data into a SQLite database, then purge the first 50% of the data, but I don't vacuum. Do I have something like zeroed-out pages for the first 50% of the file now? If I add another batch of data, am I filling in those zeroed-out pages? The manual mentions fragmentatio...
Calpau
17

votes
2

answer
9.2k

Views

Why is it a vacuum not needed with Mysql compared to the PostgreSQL?

I am more familiar with PostgreSQL than MySQL. Have encountered wraparound Id failure once with the PostgreSQL db and then understood the importance of vacuuming in the db. Actually, that was such a massive overhead work to deal with(and it was with a old version 7.4.3 which is updated a few months...
RunningAdithya
18

votes
3

answer
23.6k

Views

How to vacuum sqlite database?

I want to know how to vacuum sqlite database. I tried a syntax MANUAL VACUUM command for the whole database from command prompt: $sqlite3 database_name 'VACUUM;'; But it's giving error as: near 'database_name': syntax error. and also AUTO VACUUM: PRAGMA auto_vacuum = INCREMENTAL; And tried it for a...
meghalee
18

votes
1

answer
9.3k

Views

Do I need to reindex after vacuum full on Postgres 9.4

I am using Postgres 9.4. I just ran vacuum full. I read about the differences between vacuum and vacuum full and considered a lot if I should run vacuum or vacuum full. As far as I can say, I required vacuum full and my db size came down from 48 GB to 24 GB. Would the old indexes would have become o...
Akshar Raaj
2

votes
2

answer
1k

Views

When should one vacuum a database, and when analyze?

I just want to check that my understanding of these two things is correct. If it's relevant, I am using Postgres 9.4. I believe that one should vacuum a database when looking to reclaim space from the filesystem, e.g. periodically after deleting tables or large numbers of rows. I believe that one...
Richard
2

votes
1

answer
209

Views

Postgresql - large delete from 500Gb DB / auto-vacuum?

I need to delete around 80% of my 500Gb Postgresql DB. I have successfully run a delete command for around 50Gb of rows so far, and paused before proceeding. (This took a long time, perhaps one hour) I notice that after deleting around 50Gb of data, no extra disk space is freed up, but some memory i...
JSStuball
0

votes
0

answer
5

Views

Shrinking pg_toast on RDS instance

I have a Postgres 9.6 RDS instance and it is growing 1GB a day. We have made some optimizations to the relation related to the pg_toast but the pg_toast size is not changing. Autovacuum is on but since autovacuum/VACUUM FREEZE do not reclaim space and VACUUM FULL does an exclusive lock, then I am n...
nmusleh
5

votes
1

answer
4.4k

Views

PostgreSQL: How to enable autovacuum?

How does one enable autovacuum in PostgreSQL? I understand the purpose, I just can't find a simple answer regarding how to enable it.
JTW
6

votes
2

answer
2.4k

Views

Is it possible to issue a “VACUUM ANALYZE <tablename>” from psycopg2 or sqlalchemy for PostgreSQL?

Well, the question pretty much summarises it. My db activity is very update intensive, and I want to programmatically issue a Vacuum Analyze. However I get an error that says that the query cannot be executed within a transaction. Is there some other way to do it?
donatello
2

votes
1

answer
1.2k

Views

Amazon Redshift VACUUM runs per schema or per database?

Does VACUUM; with no other arguments run per database or per current schema on amazon redshift? The reason I am asking this is because when VACUUM completes on one schema and I change the default schema, and run it again, it takes a whole hour to complete.
Martin Taleski
5

votes
3

answer
675

Views

Postgres 8.4.4 (x32 on Win7 x64) very slow UPDATE on small table

I have a very simple update statement: UPDATE W SET state='thing' WHERE state NOT IN ('this','that') AND losttime < CURRENT_TIMESTAMP; The table W only has 90 rows, though the losttime and state columns for each row are updated each about every ~10s seconds. There are indexes on state and losttime...
Mayur Patel
11

votes
2

answer
20.8k

Views

How do I know if the statistics of a Postgres table are up to date?

In pgAdmin, whenever a table's statistics are out-of-date, it prompts: Running VACUUM recommended The estimated rowcount on the table schema.table deviates significantly from the actual rowcount. You should run VACUUM ANALYZE on this table. I've tested it using pgAdmin 3 and Postgres 8.4.4, with aut...
Beibei
2

votes
1

answer
97

Views

Strategies to preserve disk space in high input frequency application

I have a requirement to support shrinking of a database which has a data entry rate of 1 entry (approx. 300KB) per second. The database file can reach 3GB. The current database has no auto vacuum feature. Database file space going over a certain limit (say 3GB) is worst-case scenario. My current str...
geejay
1

votes
2

answer
1.6k

Views

n_dead_tup vs dead_tuple_count in postgresql?

I initially thought n_dead_tup and dead_tuple_count in PostgreSQL give the same counts. But they seem to be not. I do not quite understand what exactly is difference. Following are my observations: Created a table with 10k rows. Updated all the 10k rows. Now I have 10k dead tuples. SELECT dead_tuple...
Raviteja
4

votes
1

answer
72

Views

Refreshing materialized view CONCURRENTLY causes table bloat

In PostgreSQL 9.5 I've decided to create a materialized view 'effects' and scheduled an hourly concurrent refresh, since I wanted it to be always available: REFRESH MATERIALIZED VIEW CONCURRENTLY effects; In the beginning everything worked well, my materialized view was refreshing and disk space usa...
AlexGordon
2

votes
3

answer
294

Views

What does removable mean in Postgres' vacuum output?

I have run a full VACUUM to a Postgres table with 9 million rows and I got this back: INFO: vacuuming 'osm.asp_trs_roads_osm' INFO: 'asp_trs_roads': found 329992 removable, 9660438 nonremovable row versions in 761738 pages DETAIL: 0 dead row versions cannot be removed yet. CPU 8.98s/13.06u sec el...
user1919
2

votes
2

answer
3.1k

Views

Using Sqlite3 VACUUM command on Core Data SQLite Persistent store

In our app, we are implementing sharing of partial Core Data SQLite database through network/email. In order to keep the file size small, I have implemented the below method to shrink the Core Data database. - (void) shrinkDB { sqlite3 * database; NSString * string = [shareStoreURL path]; const cha...
Dhanush

View additional questions