The discipline of Operational and Architectural Management of Database Systems.

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1answer
356 views

Load Testing Crash Course

Can someone point me at a good resource to get a crash course in load testing. I have a sql server machine that I need to load test but I havent been thruogh the process before. Also we do not have ...
3
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1answer
22k views

What queries is Oracle executing, how frequently, and time-taken?

I have a (Java) web-application, that of course executes many queries (selects, inserts, updates, deletes) to the Oracle Database. I want to find out the following for last 7 days: SQLQuery ...
3
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3answers
184 views

What is a good guideline for sampling for statistics updates

Scope: A billion record table that is indexed in 10 ways. Rate of change per day is 1/2 a percent. Some of the indexes are monotonously increasing (datetime/timestamp), yet the common queries most ...
3
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1answer
2k views

Does `Seconds_Behind_Master` show exact Slave Lag from Master?

Does Seconds_Behind_Master always show the correct number of seconds the slave is behind the master? I have also Implemented the mk-heartbeat replication monitoring. It was showing the other result ...
3
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1answer
56 views

Unable to change database owner to a user that is already mapped as user

I ran into this problem. Trying to change a database owner to acct1; however, I get the following error message when doing so: The proposed new database owner is already a user in the database ...
3
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2answers
179 views

query to find all dblink()

Besides manually searching for all the dblink() used in triggers/functions/stored procedures is there a way to query for this information? Example: There is a dblink inside of a trigger, can I select ...
3
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2answers
89 views

Designating databases to certain CPUs

SQL Server 2012. AlwaysOn Cluster with two nodes, each has 4 cores We are consolidating SQL server instances and moving bunch of databases from various locations to a single cluster which has two ...
3
votes
2answers
1k views

What's the point in SQL Server Central Management Server?

Online MSDN article "Execute Statements Against Multiple Servers Simultaneously (SQL Server Management Studio)" (SQL Server 2012) states: "Note Before you execute the following procedures, ...
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2answers
11k views

db2 database alias not listed via list database directory but still unable to create that database

I am trying to create a database by logging on to the linux server on which the db2 server is installed, as the instance owner db2 => list database directory System Database Directory Number ...
3
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4answers
2k views

What is the best permissions to set for only creating and managing own databases?

I want to create a login for a new user who could only create and manage their own databases. Other databases on the server should be read-only to that user. What would be a good set of ...
3
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1answer
72 views

Administration of MySQL Users

What is the best practice for keeping and maintaining MySQL users? Say for example I have 5 programmers and a PHP application connecting to a database. Should I create 6 different users 1 for each ...
3
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1answer
1k views

Master and Slave having same id's

I am working as a remote DBA for some of the production servers. There was replication from Master to Slave. There is something changed in the scenario they have made one of the Slaves as master ...
3
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1answer
74 views

Can a Table Lock eliminate a deadlock or make it worse Oracle

We have a situation in which an Oracle Database is having deadlocks issues. I said that perhaps we should lock into some table locks, and a guys response to me was "Unless I am misunderstanding ...
3
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1answer
60 views

Create Database and LCK_M_S

We are experiencing issues when creating a database in the SSMS GUI in that sometimes it times out complaining that it could not get an exclusive lock on the Model database. Other times the database ...
3
votes
1answer
69 views

Partially contained databases and Windows Logins - best practices?

In versions of SQL Server prior to 2012, in order for anyone to log in to a database using Windows credentials, you first had to create a server-level login, them map that login to a user for each ...
3
votes
1answer
140 views

Trace Flag 3688 not working on SQL Server 2014

We are using some third party tools that fill up the SQL Server logs with entries like: SQL Trace ID 1 was started by login "sa". SQL Trace ID 2 was started by login "XX\xxxxx". SQL Trace stopped. ...
3
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1answer
145 views

How to make PostgreSQL default_tablespace work properly?

My question is, "Why isn't database 'screwy' created in tablespace 'screwy'? I made the following script, with it's output following, to show the problem I am having : #!/bin/bash # export ...
3
votes
1answer
304 views

How to upgrade MySQL (5.5) production DB to 5.6 with minimal downtime

Our existing Database size around 200GB. We want to use consistent, parallel backups methods. For testing, I migrated my Development DB from 5.5 to 5.6 by running mysqldump with option ...
3
votes
1answer
934 views

Why is the “The package can not be saved to the file system since its protection level is server storage” error?

When I execute dtutil /sourceserver localhost /SQL "\Maintenance Plans\MaintenancePlan_daily" /copy file;.\MaintenancePlan_daily.dtsx from the answer to my question "Any way to ...
3
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1answer
682 views

How to drop all scheduler events in MySQL 5.6?

In MySQL 5.6 is there a way to drop all scheduler events with an administrative command or do I have to go through them one by one with DROP EVENT [IF EXISTS] event_name?
3
votes
1answer
124 views

SQL Server database schema (and likely, some data changes) - how to auto-distribute over many database instances

Our development involves a SQL Server database (also might be Oracle or Postgres later) and we would sometimes make database schema changes or some other interventions in database. What solutions ...
3
votes
1answer
80 views

Does avg_query for PgBouncer include update and inserts?

Trying to tune our application and would like to know if the stats data that pgBouncer shows as avg_query, according to the PgBouncer docs on usage: avg_query Average query duration in ...
3
votes
2answers
4k views

Database design for an E-commerce website

I am new to database design. I am designing a database for an E-commerce website, there are a lot of products to be updated, but while designing for product specification table I do not understand ...
3
votes
1answer
850 views

MySQL specific database configuration file

In MySQL's configuration file I've globally disabled autocommit as so. [mysqld] autocommit=0 I need to turn MySQL's autocommit on for a specific Ruby on Rails database though. It could be for the ...
3
votes
1answer
7k views

Is it possible to do a datapump import with a different user than did the export?

I have one db dump below is the log file for that dump Connected to: Oracle Database 10g Express Edition Release 10.2.0.1.0 - Production Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01": system/******** ...
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0answers
25 views

How can I generated a list of all DB2 Objects including Last Modified Date of object on AS400?

I am going through an audit, of an AS400 application. AS400 has a DB2 database, and I need to generate a list of all DB2 Objects/Tables including their last modified date. Can anyone help me? Thanks ...
3
votes
3answers
89 views

What architecture is best to store a large 3 dimensional array in MySQL?

I am looking to create a large 3 dimensional database in MySQL. The structure will basically be a standard MySQL table, with a time component / dimension added. See the following analogy: { x, y, ...
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0answers
49 views

Need a way to prevent log shipping from kicking users out

We have SQL Server 2012. A service we use requires us to use log shipping, however we are tired of having users being kicked offline every 15 minutes. Are there any creative ways to get around this ...
3
votes
1answer
28 views

SQL Server 2012 - How to Remove Partition on Publisher but not Subscriber?

Is it possible to setup partitioning on a SQL Server 2012 publisher table, so that older data can be removed without affecting the same table on a subscriber table? Table exists on Database A (SQL ...
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0answers
10k views

Importing a different character set export dump into another DB instance

I am trying to import a given dump file using oracle imp utility. However; I am facing the following issues. C:\Users\AD>imp DB_USER/*****@dev1 file=C:\test\db42312.dmp log=C:\test\import2.log ...
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0answers
909 views

Once more about SQL Server virtual accounts

Let me reboot my question on SQL Server virtual accounts permissions The (same) MSDN article on the same version 2012 of SQL Server "Configure Windows Service Accounts and Permissions" states: ...
3
votes
0answers
464 views

How to properly configure pgBouncer transaction level pooling?

What is a good way to determine the number of available transaction connections when using pgBouncer to pool database connections? Also, how should I determine the number of max_connections and ...
3
votes
1answer
1k views

Mysql - show results from 3 tables excluding NULL or EMPTY values for certain fields

I have 3 simple tables with polls, users and votes. I'd like to show all polls ordered by clean count of votes (sometimes either poll_id or user_id don't get inserted). Furthermore I'd like to show ...
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0answers
1k views

Standby controlfile error

I am doing dataguard. I have manually done a backup for the standby database. It was working fine. Problem arose when I used the standby controlfile. On the primary, I have created a standby ...
3
votes
0answers
598 views

SQL Developer Data Modeller and Data Dictionary question

I'm not a DBA but I am a (mostly!) competent SQL report writer. Can I trouble you DBAs for some pro-knowledge, please? I can connect SQL Developer to Oracle XE's data dictionary without any problem, ...
2
votes
3answers
254 views

How to validate and upgrade my knowledge of SQL Server with MCSA

My story is that I am working now almost 10 years as an administrator, I deal with SQL Server and other IT stuff, most of my knowledge is self taught by reading books, dealings with problems and ...
2
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5answers
3k views

How to determine why a MySQL server has become slow and requests sometimes time out?

I'm working on my first project that makes heavy use of a MySQL database and am struggling to understand performance issues I'm having. Most of the time, responses are returned quickly from the ...
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2answers
651 views

Generalisation in databases

I am working on a Hospital Management project in DB2. I have one table for staff with a primary key of staff_id. The hospital has to have different staff... e.g doctors,nurses,e.t.c. Is it better to ...
2
votes
3answers
1k views

Oracle 12c in-memory option

I've been told that there's an oracle in-memory option for 12c and that it uses columnar compression to get some great query speeds. I'd like to leverage it for some business intelligence stuff. I've ...
2
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3answers
208 views

Reasons to Backup (or not backup) QA and Dev Databases

Pretty simple question: is it standard/best practice to backup dev and QA instances of the database? Assume that the schema information is kept in some form of source control.
2
votes
2answers
100 views

which option is better for not slow down the performance of queries?

I am developing a system that records customer payments, when a customer makes a payment, the system must update the account and show the payment made and all previous payments, is here when the ...
2
votes
2answers
2k views

Having a PostgreSQL database exposed to the internet

I've seen on DBA and other sites that exposing a database to the Internet is a particularly bad idea, but I noticed that PostgreSQL has SSL-certificate-only authentication. Does this make it any safer ...
2
votes
1answer
676 views

Create a sub query for sum data as a new column in SQL Server

Suppose that I have a table named tblTemp which has this data: | ID | AMOUNT | ---------------- | 1 | 10 | | 1-1 | 20 | | 1-2 | 30 | | 1-3 | 40 | | 2 | 50 | | 3 | 60 | ...
2
votes
1answer
2k views

Solve conflict between affinity mask and I/O affinity mask?

I executed this on one of our SQL Server machines: EXEC sp_configure 'show advanced options', 1 And then executed RECONFIGURE. This presented me with the following error message: The affinity ...
2
votes
2answers
4k views

How to deny drop permission for a table?

Is there a way to deny drop permissions for a specific table from a user or role?
2
votes
1answer
396 views

Duplicate login details per user in error log

Being able to view details of who successfully logs into a database and which user's login failed via the error logs is a good thing. However I have a scenario that I need help with: For some reason ...
2
votes
2answers
371 views

How can I prevent users from overwriting databases when restoring?

I don't want users to restore (with overwrite) on some specific databases. How can I inhibit from restoring over these databases?
2
votes
1answer
3k views

How can I move LOB_DATA ( varbinary/image/text) to different Filegroups

LOB_DATA : varbinary(max),varchar(max), image , text columns. I have 4 tables with large amount of LOB_DATA in it. I would like to move LOB_DATA in these tables to different File group in a different ...
2
votes
2answers
68 views

Give every user 3 default 'bookmark' entries

I've got a table users and a table bookmarks. The table bookmarks obviously contains pages the user wants easy access too. But, there's a new requirement now: every user gets 3 unmutable bookmarks. ...
2
votes
1answer
914 views

Is DBCC SHOWFILESTATS an accurate way to see unused space?

We have a few tables each with near 100 million rows of data. A co-worker has these tables setup with partitions based on a date field. Our disk space is starting to run low and knowing that ...