Questions tagged [maintenance]
In the context of a database, maintenance describes routine operational tasks around a database system, such as monitoring, tuning and backup procedures.
293 questions
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One step in Azure SQL job does not retry
I have an Azure SQL Database with a weekly maintenance job. The job scales the database up, performs various tasks, potentially including an index rebuild if fragmentation is high, and then scales the ...
3
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2
answers
243
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How can I run sp_refreshview across all views in my SQL Server database
I'm using SQL Server, and I received an error indicating that one or more of my SQL views is out of sync with its underlying SQL table.
'MySQLServerName' returned data that does not match expected ...
- 339
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5
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191
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Investigate why SQL Log file increased in size
We had one or more of our log files increase in size over night, causing our SQL logs disk to almost fill up. I've been asked to look at what could have caused this.
Can anyone suggest where to start ...
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2
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2
answers
172
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PostgreSQL: Long running auto vacuum and high wal rate
Recently a vacuum process triggered by auto vacuum daemon(PostgreSQL13) on one of our table took long 1.5hr to complete. During this period there was high WAL rate up to 7MB/sec and high Disk I/O. ...
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1
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106
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PostgreSQL: What are different operations make the use of Temp files?
We have time series monitoring on both pg_stat_database as well as pg_stat_statements. Recently We have been observing temp file usage in our DB during certain period. But for the same period we are ...
- 393
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1
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149
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When to rerun CLUSTER?
Currently using Postgres 14.
Running CLUSTER sometable USING someindex; is great, but is there a query to determine how "unclustered" the table has become after many updates and deletes?
...
- 658
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33
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Statistics update - worthwhile on a high activity table or not?
I have a table with 1.5 billion records which is sampled at 1%. Said table receives over 200-300k insert/update/deletes per hour. Within a couple of hours, the statistics are auto updated as it ...
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38
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Clarifications on Maintenance jobs & CDC on upgrade to ENTERPRISE EDITION
Raising these on behalf of our DBA team. We are looking at moving to ENTERPRISE SQL SERVER 2022 soon and would need help clarifying a few things:
We are looking at a 3-NODE setup:
(1) NODE-1: Primary
(...
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3
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2
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614
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Is automatically renaming indexes when renaming columns relevant for database health/maintenance?
I am currently building out a few features for a project where customers are able to change up their database schema via an UI and we handle all the nitty-gritty details on running the required ...
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2
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439
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Can I get the created time of a PostgreSQL DB?
I'm using PostgreSQL-13.0.
Is there a way I can get the created time or last modified time of a database?
Thanks!
- 359
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217
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Error message when running a SQL maintenance plan backup
I'm receiving the following error message when my daily maintenance backup plans execute:
Error Message 1:
[298] SQLServer Error: 407, Internal error. The string routine in file e:\sql11_main_t\sql\...
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1
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599
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Analyze only one partition in PostgreSQL
I have a metrics table partitioned by year and month (metrics_y2023m01, metrics_y2023m02, etc). The analyze metrics command updates the statistics of the table and each partition individually, but the ...
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1
answer
95
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Partitioning using column from different table
I have a table ActionValues with the following columns:
AccountID
Action
ActionValue
This table is related with a second table called Actions that has the following columns:
AccountID
Action
...
0
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0
answers
259
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How to temporarily switch PostgreSQL to logical replication to allow major version upgrade without downtime?
We have a PostgreSQL cluster running on one master (db1) and two async hot-standby servers (db2 and db3) replicating from it. All the servers are working as a backend for a web service and all the ...
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1
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190
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During Maintenance in MSSQL SERVER i am getting the error: the step failed
In MSSQL Server, every Saturday a maintenance plan starts, where it rebuilds some indexes.
During the last month, it always fails after some hours with the message: The step failed.
Executed as user: ...
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2
answers
3k
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MySQL db optimization error on innodb tables
I have a database named 'mysql' which is being used on RHEL 8 server running MySQL 8.0.32.
When trying to optimize the entire database using the mysqlcheck command 'mysqlcheck -o mysql' the below ...
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2
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163
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SQL Grease : Strategy to maintain Azure SQL database
I am a developer that dabbles a few things across the entire stack. I have never had the opportunity to work to work on a product that uses a monolith Azure SQL database on a Premium tier scaled up to ...
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1
answer
195
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sp_BlitzCache detecting thousands of executions of CREATE PROCEDURE dbo.CommandExecute (from Ola Hallengren's Maintenance Solution) [duplicate]
I recently implemented the Maintenance Solution as a nightly job in my company's database, via Windows Scheduler. It works as intended, except for one issue - the procedures are being created ...
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5
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1
answer
781
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Rebuild of DB fails, yet size of the DB has doubled
I attempted to rebuild all the indexes of a DB using the query,
USE [DB_Name];
GO
DECLARE @TableName VARCHAR(255)
DECLARE @sql NVARCHAR(500)
DECLARE TableCursor CURSOR FOR
SELECT '['+...
0
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2
answers
734
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Postgres: Dropping Database impacts performance
I worked on a DB-server hosting multiple big DBs including DBs that aren't used anymore. I wanted to drop one of those old DBs and it already took longer than I expected(over 40 seconds) then I ...
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140
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Any possibility that Ola Hallengren could add a job name prefix option to the script that creates all the maintenance jobs? [closed]
When creating the jobs, they sort together for most of them, but some of the jobs are alphabetically far away from the other Ola jobs on servers with hundreds of jobs.
I would find it easier to see ...
- 99
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1
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165
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SQL Server - Maintenance - How to obtain duration per database from the commandlog table
Attempting to obtain the duration for individual maintenance operations per database in the commandlog table which is available in Ola Hallengren's maintenance scripts
If anyone has a better solution ...
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481
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VACUUM FULL using another disk
Current database takes almost all of SSD free space ~802GB. 800 GB of memory is taken by single table and it was never vacuumed since 2019. Recently i deleted old rows from the table and now i need to ...
2
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6
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4k
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Is there any purpose of Ola Hallengren's SQL Server Index and Statistics Maintenance scripts on sql server running on SAN storage?
I have configured Ola Hallengren's backup and integrity check scripts.
However I want advice whether it is required to setup the SQL Server Index and Statistics Maintenance scripts, because my SQL ...
- 3,489
2
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1
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435
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Is there a proper order to run mysqlcheck commands in for periodic maintenance?
Is there a proper order in whcih to run the various mysqlcheck commands?
e.g. CHECK TABLE, REPAIR TABLE, ANALYZE TABLE, OPTIMIZE TABLE and also FLUSH TABLES and FLUSH LOGS.
I wrote this script that I ...
- 143
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1
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2k
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AWS RDS "Maintenance Required"
I saw from the web interface that maintenance on my RDS postgresql instances is required, so I ran aws rds describe-pending-maintenance-actions, and it says that there's a "system-update" ...
- 658
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2
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3k
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How to reduce the size of a SQL Server-Database?
Context
We have a Backup DB, where we normally store BackUps of tables from production DB before doing any updates/deletes. If anything goes wrong, we can restore the data from that table created in ...
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1
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1
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3k
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Ola Hallengren maintenance solution
When I am executing the below query:
EXECUTE dbo.IndexOptimize
@Databases = 'USER_DATABASES',
@FragmentationLow = NULL,
@FragmentationMedium = NULL,
@...
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261
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Oracle gather stats autotask being interrupted before maintenance window ends
a few months ago I managed to enlarge the maintenance windows for autotask on a pluggable database, this way:
BEGIN
dbms_scheduler.disable(
name => 'WINDOW_NAME');
dbms_scheduler....
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1
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6k
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How to forcefully drop all active connections off a database?
On one server I have a Postgresql database and there're many clients on other servers accross the internet that connect to it. I want to drop all the active connections on demand, they should be ...
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1
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295
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Turning off Secondary Replica in Always on availability group for maintenance
We are planning to turn off the secondary synchronous replica in our always on availability group for few hours for maintenance . Once we are done with the maintenance then we will need to failover ...
- 1,063
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2
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1k
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When to analyze columns?
I have a table with millions of records. Before select, I run Analyze table (col1, col2).
We want to reduce cost, since a lot of IO operations happen in AWS Aurora.
Should I run analyze only when we ...
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1
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855
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Schedule SQL Jobs from Central Management Server
I've set up a Central Management Server on a SQL Server 2016 instance. I'm able to manually run queries against multiple servers, but I want to be able to run automated maintenance scripts.
Is there ...
- 103
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4
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235
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Index Maintenance on busy OLTP database
I have a database where constant read writes happening all the time. Searches are being done with wild card entries. The server is on SQL 2016 standard edition.
There is no budget for enterprise nor ...
- 1,063
2
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1
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421
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Limiting total number of records in a table with a nightly job
We have a table that stores audit records (Log in, log out that kind of thing), we already have a nightly job that archives any data that is older than 3 months.
However every week or two we get ...
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3
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1k
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How to perform bulk delete and release free space?
Good Afternoon,
We have a database that wasn't been an archive anytime. The database has grown tremendously and we are running short of space. Hence there is a need to do a bulk delete and free space. ...
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1
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200
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Which is the best approach to "suspend" the activity of a whole AOG cluster thinking on start it again later?
My company is going to migrate some services from one on-prem site to another but the database servers will remain in the same location (for now).
I've been asked for "suspend" all the ...
5
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2
answers
3k
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Auto vacuuming high-write, high-update, and mostly read table types
What are good auto vacuum settings (recommendations) for tables like:
High Write Table Insert load
Range between 30-10,000 inserts in a day. The table can idle for weeks without load, but can get ...
- 51
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2
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699
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Finding tables & columns at risk of hitting max value of int
I just took over a medium-sized postgres database and the team has been surprised with many tables hitting their auto-incrementing id int max limits which triggered unscheduled downtime to fix.
Does ...
- 223
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2
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1k
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In Postgres, what should be the autovacuum strategy for big tables (hundreds of millions rows) that get added/removed thousands of rows every day?
I have quite a big table with a lot of daily traffic for reads, inserts and deletions. Currently, it has 392 million of live tuples and 27 million of dead ones. Vacuum settings (...
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105
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SQL Server online maintenance - False publicity?
I'm being challenged since we have customers that are seeing different types of errors while running what is supposed to be online maintenance. errors like timeouts, scan stopped due to data movement ...
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642
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DBCC CHECKDB behavior with MAXDOP settings
I am trying to understand the DBCC CHECKDB usage with MAXDOP settings-
If i run DBCC CHECKDB with MAXDOP = 0 on a SQL instance where my MAXDOP settings is 8, what is happening actually? Is all of my ...
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156
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Are there differences between which AlwaysOn AG server (Primary or Secondary Replica) I store my backups and retention maintenance plans on?
I have an AlwaysOn AG system in place between two servers. Server A hosts the primary replica, Server B hosts the secondary replica.
Are there any differences if my Full & Transaction Log ...
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70
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How to select specific databases in a backup retention policy maintenance plan cleanup task?
I have full backups of three different databases. Right now all of their backups follow the same retention policy, but I need to setup the retention to a different amount of time for each database.
...
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47
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Does this plan work as a Failover strategy-SQL Server 2016 Standard Edition
We have two SQL Server 2016 Standard edition (standard edition due to budget issues) configured one as primary sql server and another one as fail-over server.
I have implemented Transactional ...
- 1,335
-1
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3
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416
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How to maintain a query that runs forever?
I would like to run a query that finds prime numbers, and I would like to run it forever.
@Solomon Rutzky on this page Prime numbers in a given range , give us a good example of the Sieve of ...
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192
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Hide business data from maintenance user
I'm newbie in postgres and have a question:
we have some clients that have ultra-super-secure-sensitive data on postgres and they don't want to show it anyone. but sometime, the apps experience some ...
- 430
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68
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Running CheckDB on a clone
My company are looking to bring in Redgate's SQL Clone to deploy live databases into other environments. I wanted to see if running CheckDB on these clones was a viable option instead of restoring a ...
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225
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Foreign Keys delete data [closed]
I am failing to understand a few concepts about FKs, i have some really big tables (dozens of million rows) with lots of FKs and i want to delete old data, i can disable FKs -- delete Data -- enable ...
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1k
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log to table vs log to output file
I am using ola-hallengren solutions for database maintenance.
A question about the log, I see in the documentation website:
LogToTable: Log commands to the table dbo.CommandLog.
Value Description
...
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