The discipline of Operational and Architectural Management of Database Systems.

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Difference between Row based and statement based replication in Mysql?

What is the Actual difference between Row based and Statement based replication I actually looking in terms of replication effect's on slave. If I am using Row based replication then whats is the ...
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2answers
3k views

When was a Database taken Offline

I am trying to find a way to figure out when was couple of my sql databases were taken offline. I checked the the logs but could not find any such info and moreover there is no default trace enabled. ...
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3answers
517 views

Can I check the services currently running through SSMS?

I want to check which services has started and which has not by running a script/query on SSMS.
6
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1answer
1k views

What to do when handed a server the first time?

I'm a new SQL Server DBA in a new company. Just recently, they have handed me access to the server. There are about 50 OLTP databases with different sizes, some ranging 250MB and the biggest database ...
6
votes
2answers
5k views

The best way to rename the tables after development completed

What is the easiest and most reliable approach to rename the database tables and columns in SQL Server 2008 r2? We have finished development and for some reasons, we are required to rename some ...
6
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2answers
12k views

SQL Server Connectivity Issues

I am getting the below error on occasion. Maybe every 30mins or so. I am not sure how to track what is causing the issue. I think it could be a Network problem as there are disk backups running as ...
6
votes
1answer
12k views

Disabling Checking of Schema On Function/Stored Procedure Creation

I'm trying to automate the process that executes changes to the SQL Server 2008 R2 database. The process I put in place drops and recreates my stored procedures and functions, as well as run scripts ...
6
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2answers
2k views

Stored Procedures Best Practices: Fenced or Unfenced?

I believe I understand the reasons behind fenced and unfenced stored procedures. Fenced run "outside" of the database (in our case DB2) so as to prevent possible corruption of the database engine ...
6
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2answers
2k views

Unknown Db file format - best way to find out?

A client has given me the data he wants visualised in my project - but I don't know what DB format it's in. He's pretty unclear, also.. I have access to the table structures, but don't know how to ...
6
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3answers
427 views

Sql Server Service Pack Update Notifications

Is there any option in Sql Server to enable notifications from Microsoft in a way that it sends us emails every time a new service pack is released? I have multiple servers with different versions of ...
6
votes
2answers
9k views

mysql multi threading for a single query

I have big db of size 8GB and having 9 million contacts in this db. When we try to retrieve all contacts, it takes nearly 1 or 2 hour (in some cases result in timeout) to retreive all contacts for the ...
6
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1answer
1k views

Better to use a RANGE RIGHT or RANGE LEFT Partition Scheme

I'd like to know if it is better to use a RANGE RIGHT partition scheme or a RANGE LEFT partition scheme? Is one of these options by default a better choice, or is it heavily dependent on the actual ...
6
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2answers
3k views

Two corrupted indexes found by DBCC CheckTable

I'm wondering if this problem is solvable by dropping/recreating the two indexes. Both are rarely used, nonclustered, non PK, non FK indexes. Here is the dbcc output: Table error: table ...
6
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1answer
1k views

Does dropping a Primary Key constraint from a Partitioned Table break the partition?

We have a table partitioned on a date column. The Primary Key for the table is a composite key of this date column and 4 other columns. We are thinking about dropping the Primary Key constraint from ...
6
votes
1answer
6k views

What memory should be given to the variables of my.cnf ?

Installing a MySQL server is quite easy. However, after installing, configuring the server is an important task for a DBA. Having 2GB of RAM and 250GB of disk space, how should I tune MySQL server so ...
6
votes
1answer
356 views

Role of Database Administrators

I am currently working as an application developer on a project which involves the creation of a new SQL Server database. I am actively working with a group of DBAs who will play some role in the ...
6
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1answer
5k views

Appending backups while overwriting expired sets

I've been reading up on this, but the online documentation is a bit difficult to understand and seems awkwardly written. For example the INIT, NOINIT. One says it will try to overwrite everything. ...
6
votes
2answers
5k views

efficient way to poll database?

I have a Linux CentOS server hosting an Oracle 11.2 database, which communicates with an application server, which communicates with a client (a Flex application). I'll try to describe the pseudo-code ...
6
votes
2answers
5k views

Is it viable to attribute permissions to SQL Server virtual accounts (NT Service\SQLSERVERAgent, etc)?

Using MS SQL Server 2012 in Microsoft Windows Server 2008. I am somewhat confused by the New Account Types Available with Windows 7 and Windows Server 2008 R2 virtual Windows accounts [NT ...
6
votes
1answer
6k views

Could too many idle connections affect PostgreSQL 9.2 performance?

Some queries on my database server seem to take a long time to respond, and I believe the CPU usage is high. When running ps aux, I see ~250 "idle" connections (which I believe to be too many). I ...
6
votes
1answer
185 views

What is a good way to determine the performance I should expect from a PostgreSQL server?

Trying to figure out how I should expect my database to perform. Basically, I need to determine when the server I have set up is reaching its performance limits - which would help me plan server ...
5
votes
3answers
8k views

How to reduce the log file size without shrinking it in SQL server

In SQL server, how do you reduce the log files size without (DBCC) shrinking it. I know shrinking the log file will free up some space, but will also cause fragmentation. Doing a checkpoint in simple ...
5
votes
2answers
131 views

MongoDB vs RDBMS DBA duties

What are the differences between the daily tasks/duties of a Mongo DBA compared to a RDBMS DBA? For example, some sites claim that a MongoDB DBA would not require to do data modelling or designing ...
5
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4answers
702 views

Recommendation for free event monitoring software

I'm seeking recommendations for free / open event monitoring tools. HPOV costs continue to multiply like so many wet gremlins, and we've had enough. There are some interesting suggestions in this ...
5
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2answers
1k views

Running each SQL Server service under different Windows accounts

Besides the Database Engine, SQL Server has some additional Services, namely: SQL Server Integration Services SQL Server Analysis Services SQL Server Reporting Services SQL Server Agent Should ...
5
votes
2answers
3k views

Update Statement takes forever to complete [closed]

I have table around 1250000 records, and 80 columns Table Structure CREATE TABLE [dbo].[Table] ( [Column1] [int] IDENTITY(1, 1) NOT FOR REPLICATION NOT NULL, [Column2] [int] NULL, [Column3] [int] ...
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2answers
2k views

Creating partitions on a production database

I have a production MySQL 5.1 database that is running well but I want to improve query performances. I have never used Partitions and just going through the manuals. I have two tables that involve a ...
5
votes
1answer
1k views

How do I track logins, connections, user accounts, queries, …?

I am a BI person who has been asked to step in and pretend I am a DBA. I am not a novice with databases but AM a novice at the admin type stuff. We have a SQL Server database that is going to be ...
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3answers
1k views

Bad use of Oracle Tablespaces

I have a doubt about the use of oracle tablespaces. I've decided to define for each schema of the datababase two different tablespaces (one for data, and another one for indexes). The problem is that ...
5
votes
1answer
732 views

Expanding a partitioned table

I have a table that holds four years of data, where for each month I have a partition that is based on a filegroup with two files. Unexpectedly, I received eight more years of data and prepared the ...
5
votes
2answers
4k views

What is the point of the TABLE_CATALOG column in INFORMATION_SCHEMA.TABLES?

In MySQL's table INFORMATION_SCHEMA.TABLES, there's a column named 'TABLE_CATALOG'. The documentation is sparse on this column and I'm wondering what the heck is the purpose of this? Any killer-app ...
5
votes
3answers
1k views

Suggestion required for Large Database Optimization and performance

We are creating a large database with estimated growth rate 200 million+ records per annum. The database is use for analysis purpose and we will generate different tabular and graphical reports from ...
5
votes
2answers
3k views

Transaction log is full due to 'CHECKPOINT' for DB in simple recovery model

For one of our DB's on SQL server 2012 RTM, We could not perform almost any troubleshooting step as the error says: " Transaction log is full due to 'CHECKPOINT" This being a dev database, its ...
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2answers
3k views

How to change default database to all logins?

I'm bit new to SQL Server and I'm trying to script out Microsoft SQL Server (2005-2014) post installation activities and I got bit stuck on altering logins. Corporate policy states that none login ...
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2answers
386 views

What are sensible/rational character limits in a database e.g. for a persons name

This is a general question about database admin. Is there some kind of standardization for character limits on fields in a DB? It makes sense to specify character limits on the database end for ...
5
votes
1answer
512 views

Is there a standard approach to rolling out database schema changes?

A developer said I should simply wrap all my database upgrade scripts in a transaction. If it fails, just roll back all changes. All my instincts tell me this is wrong, especially when it comes to ...
5
votes
2answers
170 views

Is it somehow possible to predict / foresee when SQL Server will trigger auto-growth?

I found numerous questions / answers about SQL-Server auto-growth - almost all indicating that one should try to avoid auto-growth if possible. However auto-growth is available with MS SQL Server and ...
5
votes
2answers
38k views

How to grant all privileges on all tables in a schema to a user in IBM DB2?

At first place, I want to export database from IBM DB2 AIX into IBM DB2 windows. Unfortunately, I can't use BACKUP and RESTORE command because of difference OS issue. So I have to resort to db2move ...
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2answers
2k views

How do you find home information for Oracle RAC on Unix?

Need help finding Oracle home path corresponding to a database instance in RAC environment. I am aware of few of the ways to achieve the same. Listing them below to avoid the same answers. ...
5
votes
1answer
1k views

Does PgBouncer create a separate pool for every database config entry?

If I set up a pgbouncer.ini config file with several database entries, does pgBouncer create a separate pool for each one? I would think so, but have not been able to confirm this. For example, ...
5
votes
1answer
110 views

How can I copy specific tables into one SQL Server Table into a separate table automatically?

I'm not sure if this is possible. Looking for some help with a specific issue. I am building an iPhone application with a data layer written in Ruby that will connect to SQL Server 2008. For various ...
5
votes
1answer
3k views

When dedicated server process model should be used instead of shared process model?

It looks like Oracle shared server process model is better than dedicated server process model. In a shared server configuration, client user processes connect to a dispatcher and it can support ...
5
votes
2answers
1k views

How to properly configure PostgreSQL RAM usage?

Using PostgreSQL, we have several hundred concurrent processes doing regular database access. We have our data spread out through several database servers, each of which houses a connection pool with ...
5
votes
2answers
557 views

SQL Server - DBO without Backup

Similar to my previous Question : Prevent Non Copy Only Backups, how do I create a user that can do everything to my database take backups at all. I've granted them every role except ...
5
votes
2answers
976 views

How to track DML and DDL daily events

I have the following query to track what tables are modified in the current date: SELECT TABLE_OWNER, TABLE_NAME, INSERTS, UPDATES, DELETES, TIMESTAMP AS ...
5
votes
1answer
169 views

What is the best storing device for DB transaction log?

I'm using MySQL with InnoDB storing engine. Transactional log is placed to dedicated HDD. Still as it is HDD atopsar shows big load (>50%) to this HDD because of big amount of small IOs (about 50 ...
5
votes
1answer
157 views

SQL Server 2012 Unable to Utilize Defined Amount of Locks

So I've been beating my head against the wall for two days about this and I can't find a solution. I'm running a script to stage a large amount of data. This script requires roughly 35 million locks ...
5
votes
1answer
33 views

Correcting French Characters in MySQL

I Have a huge MySQL table with a long list of charities. Some of the charities have French characters in them which appear incorrectly. For example I'm getting uppercase 'É' instead of 'é' in the ...
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3answers
4k views

How do I monitor bandwidth used by SQL Server on port 1433?

I have a single server running a .NET web application and a SQL Server database (2008 Standard). I'm planning to move the database onto a separate server but in order to provision the network hardware ...
4
votes
3answers
14k views

Detecting SQL Server Utilization with a query

My current project will send queries to an sql server constantly and It may use 100% of the memory or CPU. How can I check if the server is nearing full utilization in a stored procedure so that I ...