Questions tagged [read-only-database]

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AWS PostgreSQL RDS read-replica replication failing and lagging

I noticed earlier today that the replication from one of our production databases to the read replica was not instant as it usually is. I logged into the AWS console and could see that the replication ...
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1 answer
64 views

Fix mysql replication crashed due to underlying storage corruption

we have critical database server running on two virtual machines. one virtual machine crashed due to underlying storage problem and we had to move it to different storage medium and recover the xfs ...
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45 views

Set MySql read-only from K8s cluster

I have a Kubernetes cluster running with MySQL app (5.7.32 MySQL version). I'm trying to make MySQL app be in a consistency mode, using this command: FLUSH TABLES WITH READ LOCK; SET_GLOBAL read_only =...
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1 vote
1 answer
601 views

Can we configure logins to only connect to read-only replicas in Azure SQL Database automatically?

For Read-Only routing, rather than explicitly using "ApplicationIntent=ReadOnly" into our application connection string or for individual users to specify it in additional properties, can ...
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Clear performance schema on read-only MySQL instance

I am using AWS Aurora MySQL with Writer and reader instances in replication. Both instance are used by two separate applications. I want to clear the performance schema on the read replica server but ...
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846 views

PostgreSQL 9.3, set database (or all) to read only mode

Is any simple function/command for PostgreSQL 9.3 to set whole database to read only mode and then back to RW mode? For example same as for MySQL: FLUSH TABLES WITH READ LOCK; LOCK TABLES customers ...
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Sql server error message "the database is read only" in a remotely server - availability database

I have a failover cluster with a high availability sql server service, the problem is that I cannot create a table, update, delete remotely even if I already give specific permissions and i had ...
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Read only database for time series event data

I have a time-series dataset (around 500 million rows, 4 columns) that stores public transport ticket validations. Not sure if it matters, but it's an event driven dataset, without constant timestamp ...
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1 vote
1 answer
634 views

Sql server/azure connection string parameter for readonly access?

Is there a specific parameter that can be used in a SQL server/azure connection string to specify that the connection should be readonly? In other words, only SELECT queries should work but INSERT/...
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The MySQL server is running with the --read-only option so it cannot execute this statement

I am using amazon aurora RDS in my application. I have created cluster endpoint by selecting both read and write instance. Then I used that instance in my application. Whenever I am executing update ...
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2 votes
2 answers
2k views

Are Availability Group Databases on a Secondary replica automatically set to read-only by the AG?

I have read through the MS docs on read-only routing, but I am not talking about that. Currently, if I execute an UPDATE against a database that is on a Secondary replica and is part of the ...
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340 views

Solution for a readonly copy of a standalone MongoDB server

I store some data in many databases/collections on a standalone MongoDB server. This server is used for production. I need to access those data (or at least nightly build data, and not all databases/...
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Does a read replica help if the problem are heavy queries?

The application that our team is responsible for is having ever more often DB performance problems. The application querying it doesn't throw lots of concurrent queries, the problem we have are rather ...
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Does read-only activity on synchronous secondary replica slow down primary replica in Availability Group?

Suppose that we have an Availability Group configuration (SQL Server 2017) where primary and synchronous secondary do not share any resources (each replica have dedicated CPU, memory, disk, etc.) ...
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5 answers
2k views

Prevent read access on primary AG replica, but allow it on the readable secondary

We have a unique situation where we want to allow users to query a readable secondary replica of a database with SSMS for adhoc reporting, but not allow them to ever read from the primary replica. We ...
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Configure mongo for one shot full db read

I have a kubernetes cluster on bare metal with 3 machines having 8Gb of ram each. All my apps and a mongodb 4.0.9 replicaset runs on it. There is an import program that: Download a 8Gb mongo dump ...
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Query a database specific configuration parameter

I have a postgres 9.6 server with > 100 databases on it. When doing a mass-migrate, I use statements like this: ALTER DATABASE mydatabase SET default_transaction_read_only = false; Which works great....
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Insert- and Read-only table in Postgres

I want to create an "immutable" Postgres database, where users can insert/select (write/read) data only, but can not update/delete (change/delete). I came to know there is FOR UPDATE lock, but did ...
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How to set mariadb read_write for some specific tables while starting as read_only=1

I am trying to set a mariadb slave which is exact replica of master db. As per the suggestion I start my slave with command --relay-log=mysql-relay-bin" "--log-slave-updates=1" "--read-only=1" . But ...
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MySQL/MariaDB Read only except for a single table

I Have a database with lots of tables and read_only enabled in the config, is it possible to set a single table to be writable?
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2 answers
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Optimising MySQL database with read only tables

I have a MySQL database with 15 tables. Three of them are used for website authentication and three other are tables that are frequently read and written to. Then other tables are set in stone and I'd ...
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7 votes
1 answer
9k views

Postgres: permission denied for relation for read_only user [closed]

I am trying to set up a new read only user in postgres. I did the following steps to create the new user: sudo -u postgres createuser --interactive name: read_only_user superuser: n ...
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1 vote
1 answer
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Is there any AWS RDS Utility to Manage Master Slave mysql db with read write splitting?

I am looking for a solution for production which can manage the read and write splitting on master and slave connection as i can't affford to define multiple connection string for R/W in whole ...
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2 votes
2 answers
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Mysql 8.0 and read-only not working as expected

I have a new Master/Slave config running. Everything is happily replication. I have added a secondary user whose role will be to manage the databases and tables. Currently the following privileges ...
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0 answers
964 views

Secondary Replica Read-Only Routing via Linked Server working from one server, but not the other

I have been given the task of setting up a read-only linked server on ServerA to Availability Group listener ListnerX. ListnerX points to ServerY or ServerZ (ServerY is usually the primary). Read-only ...
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4 votes
2 answers
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SQL server Read Only permission automatically for new databases

When I setup my database I create a sql user that my application runs as. The sql user gets read only access to all the databases on the server. The problem is the user won’t have read only access to ...
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1 answer
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How do I truncate performance_schema tables on a read replica?

On occasion, you have to truncate events_statements_summary_by_digest, when it's hit the row limit. On a write master, this is easy, but on a read replica, there doesn't seem to be a way to do it. The ...
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1 vote
2 answers
2k views

What's the difference between --read-only and just permit SELECT queries?

I'm using Amazon Aurora and I have two endpoints, my endpoint which can read/write are having some issues to execute queries, these are the issues: SQLSTATE[HY000]: General error: 1290 The MySQL ...
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1 vote
0 answers
98 views

How do read queries against Postgres's JSONB type compare to Couchbase?

I'm working on a small project which would involve running queries against deeply-nested (up to 5 layers) keys in dictionaries. This would be specifically a read-heavy environment, with only one large ...
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15 votes
1 answer
431 views

Columnstore Index in read_only filegroup prevents CheckDB

It appears setting a filegroup to read_only prevents dbcc checkdb for the entire database if the filegroup contains a columnstore index. When attempting to run checkdb or checkfilegroup (for any ...
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4 votes
1 answer
15k views

Do I need to execute "create extension pgcrypto" everytime?

I have used crypt() in one of my functions to hash user password. But what I observed the next day I started my pc that the same thing failed as cryptographic functions became unavailable upon restart....
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16 votes
2 answers
24k views

Make Postgres database temporarily read-only (for performing volume snapshots)

The PostgreSQL built-in backup mechanism isn't always very suitable. Sometimes, you want to put the application in a quiescent state, because it has external data with which you want to backup at the ...
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3 votes
3 answers
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Unable to create read-only user in PostgreSQL 9.5

I seem to be having trouble creating a read-only user for a database in a fresh install of PostgreSQL 9.5 with PostGIS 2.2 on Ubuntu 16.04. Here is what I've done so far: Ran this, CREATE ROLE ...
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3 votes
1 answer
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Does SQL Server route connections to a secondary replica which has commit mode as synchronous in case of an AG with multiple secondary nodes?

If I have an AG with 4 different nodes as below: Primary Node Secondary Node 1 - Asynchronous Commit - Read Only Yes Secondary Node 2 - Synchronous Commit - Read Only No Secondary Node 3 - ...
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  • 339
5 votes
2 answers
1k views

Using postgres_fdw to connect from one read replica to another

I have two postgres database servers in AWS, A and B. These databases have different tables. Both databases also have their own read replica. My goal is a simple solution for doing cross database ...
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1 answer
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Worry to delete Read replica RDS

I created a read replica from RDS , and I do want to delete it. I am so worry about affecting the origin RDS which is in PROD . Is it recommended to take snapshots before deletion of read replica ...
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2 votes
2 answers
17k views

Obvious reason Postgres Users can't read a table?

Situation: a PG user (non superuser, inherits from parent role) that is a member of a Role/Group cannot read from specific tables even though these Object Privileges have been specified: DBName - ...
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1 vote
2 answers
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Proc caching on read only db's/replicas

I've been given the task of finding which stored procs are being called in our database. To that end I started querying sys.dm_exec_cached_plans. All is well and good, until I go over to our ...
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  • 131
5 votes
1 answer
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Create temp tables in Amazon RDS PostgreSQL read-replica

I have dozens of legacy stored procedures which create temporary tables inside for collecting results for a read-only application. I've created a read-replica of my PostgreSQL in Amazon RDS and tried ...
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2 votes
3 answers
148 views

Restrictions on user-defined queries

I have a client that wants me to implement a webpage that allows users to enter custom queries in a text box so they can directly query the SQL Server database. I am concerned about users entering ...
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2 votes
1 answer
11k views

How can I expose an Amazon RDS database as read only to other partners who access through home broadband?

In one of our projects we have hosted our web application on an Amazon Linux AMI instance and it relies on a Amazon RDS MySQL instance as DB server. One of our client's developer wants to have access ...
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0 votes
1 answer
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intel p3600 SSD no increase in read speed - postgres rdbms vs hdd

We run a custom application that produces analyzable data-sets for medical research. the amount of data we have is about 600GB in form 3Billion rows distributed in 600+ tables it is hosted in ...
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2 votes
0 answers
466 views

Basic PostgreSQL 9.x Performance Optimization Strategies for Reads/Analysis

Postgres comes, out of the box, configured as a general purpose database for both OLTP and OLAP types of loads. My need is to do use Postgres, in this case, purely as an OLAP running aggregate queries ...
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3 votes
1 answer
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Set a filegroup to readonly

I have a set of dimensions which are updated only during specific times. I have moved these tables to a specific filegroup named Dimensions. I wanna keep this filegroup as readonly. When ETL runs, it ...
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Are there security-issues with a read-only-account on Oracle-DBs?

I am currently working as IT-maintenance-guy for a classic MVC-system(oracle-db/jboss) at public sector. The newest feature should be the shutdown of my oracle-db-readOnly-Account cause of "security ...
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2 votes
3 answers
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How to backup a secondary log shipped standby mode database

We have a secondary transaction log shipped database configured for standby mode. Its primary purpose is for data recovery and for select only queries for reports etc. As the database is very big we ...
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2 votes
1 answer
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Track write requests on Read-only database

I have changed one of the databases to read-only in SQL Server 2005. I would like to track if someone tries to write to the database. Any suggestions on how to track such requests (end user write ...
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  • 437
2 votes
1 answer
3k views

Synchronizing a RDS instance with another RDS instance

I have a database on an RDS Instance (master) that needs to be synchronized to another RDS instance (slave). I created a read-replica for the first one, but that is created as read_only so I cannot do ...
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2 votes
1 answer
1k views

Implications of setting READ_Write

I am looking to update several users on READ_ONLY databases. As the databases are used 24/7 globally, and maintenance windows have just past, I would like to do this during a low-activity moment (to ...
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3 votes
0 answers
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Table queries locked during long insert SQL server

Everyday runs a sql job that loads data from bulk files and load them in auxiliary tables, to adapt and then copy to the destination table where applications read (and only read) the data. I am ...
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