3
votes
1answer
1k views

Performance of inner join query for certain condition

I have one question about inner join query in SQL Server 2008. Is there any situation where NOT to use inner joins. I have one scenario please tell me that here inner join is fruitful or not. I have ...
6
votes
2answers
167 views

Is is possible to manage SQL Server 2008 databases via R2 Management Studio?

Is it possible to manage SQL Server 2008 databases using SQL Server 2008 R2 Management Studio?
4
votes
1answer
3k views

How do you read MySQL InnoDB Monitor output?

I am new to DB Administration. I am trying to figure out the cause of deadlock exceptions, but I am unable to make sense of the logs. The log says that "transaction 1 is rolled back". Why is this the ...
2
votes
1answer
7k views

Oracle Wallet Setup ORA-12578

I am having trouble setting up the Oracle Wallet on a new box connecting to a new database. I have added the following lines to my SQLNET.ORA: SQLNET.WALLET_OVERRIDE = TRUE WALLET_LOCATION = (SOURCE=...
2
votes
1answer
1k views

Does mysqld --ndb-cluster need to be run on MySQL Cluster data nodes?

I have my management node and sql node on the same server, and 2 data nodes (3 machines in total). Do I need to run ./mysqld --ndb-cluster (or /etc/init.d/mysql-server start) on 1) the data nodes, or ...
1
vote
1answer
3k views

function based index as a conditional unique key?

I have a search table which has a generated primary key PK_ID,and also has primary keys from three or four other tables in the FK_ID column CREATE TABLE METADATA ( PK_ID NUMBER(10) ...
7
votes
2answers
5k views

How can I disconnect clients from MySQL?

I need an efficient way to disconnect all clients with a given username from MySQL. I thought about changing the users password but I think that is only checked when the connection is made. Ideas?
1
vote
1answer
415 views

How to implement a low resource privileged user on Oracle 10g using Resource Manager?

In my database I have users and their respective grants using the least amount of privileges principle. How do I start taking advantage of resource manager to prevent users from hogging all the ...
3
votes
2answers
2k views

Oracle imp crashes without error

I have Oracle 10g XE database locally. I export schema with something like exp %USER%/%PASSWD%@XE statistics=NONE owner=%USER% file=dump.dmp Exp is 10.2.0.1.0 version - so is the DB. Than I take ...
14
votes
8answers
20k views

Tools to monitor Oracle Database Performance on Standard Edition

Here is what I am looking for: Works on Standard Edition i.e. No Diagnostic Pack. Provides both current and historical performance data. Good visuals for easy spotting of trends and presentation ...
4
votes
4answers
997 views

Can two servers access the same database files?

I'm designing an application and considering some options regarding the database system since I'm not familiar with Microsoft SQL Server. I would like to know if it's possible to have 2 servers ...
2
votes
1answer
442 views

Oracle Change Data Capture: Unsubscribed column results in change set record

I am using Oracle 11g's Change Data Capture to track changes on a database table. I am using synchronous mode to minimize latency. Here's an example to illustrate my problem: Published_Table ...
3
votes
3answers
3k views

Are there ways to only replace SQL Server stored procedures when the definition has changed?

I know the following two patterns to write scripts for creating stored procedures, which can be executed repeatedly without throwing errors. if object_id('my_proc') > 0 drop procedure my_proc go ...
2
votes
2answers
360 views

SQL Server recovery with LVM snapshot as base

Is it possible to fully recover a database from a snapshot plus transaction log backups? By snapshot I mean a crash-consistent clone of the Server - in this case an LVM snapshot that is shipped ...
5
votes
1answer
3k views

How to deploy SSRS reports build through Report Builder?

I would be building or correcting the already build SSRS reports through report builder. Once the change is done in Development side, then how to publish the reports on test server/UAT or on ...
5
votes
4answers
4k views

Are there any free online collaboration database schema tools? [closed]

I am interested in a free and simple MySQL tool which can offer online collaboration functionality in creating database general schema. Do you know any?
7
votes
2answers
4k views

Oracle 10g - How to prevent one user from hogging all resources?

I am wondering if there is any way to limit how much resources one user can take on my Oracle system. I want to limit some queries and systems from being able to hog all system resources when they run ...
1
vote
2answers
1k views

Are there any reasons not enable SQLCMD-mode as default in SSMS?

I don't consider "just to ensure that sqlcmd-mode is not required by a script" a valid reason. Any things to think of before giving the order to enable this setting to my coworkers?
1
vote
1answer
523 views

MySQL: How do I limit or prevent caching for specific tables?

I'm currently working on a database schema for tables to hold user information on a website with integrated forums. Right now my idea is to have all the data in two separate tables: one table with "...
4
votes
2answers
7k views

Generate sample data for an Oracle database [closed]

Good morning, What free [or trial] software can I use to generate sample data for an Oracle database? I've been trying with various tools, but none work. Thanks for all suggestions, Alec Taylor
4
votes
1answer
2k views

Why does MySQL use all of memory and goes into swap when doing lots of delayed inserts?

We have a database server running Centos 5.6 64bit 64Gb of RAM. The server is idle most of the time. However, every hour it gets a lot of DELAYED inserts. Up to 3 mil INSERTs per hour into a MyISAM ...
2
votes
1answer
602 views

Error When Restoring Log

Here is the situation. I have restored a database to replace an existing version (need to get it back to yesterday at a certain time). So I do a RESTORE DATABASE ... WITH NORECOVERY, REPLACE, etc... ...
11
votes
4answers
11k views

PostgreSQL designing tool [closed]

I am about to design a database which is going to run with PostgreSQL. I am used to the magnificent tool called MySQL Workbench for MySQL database. It is useful and it looks good which I kind of ...
11
votes
3answers
6k views

Should I use SQL JOIN or IN Clause?

I have a question about best approach. I am not sure which approach is best when data is considered variable in size. Consider the following 3 TABLES: EMPLOYEE EMPLOYEE_ID, EMP_NAME PROJECT ...
1
vote
0answers
124 views

MySQL Cluster — Storing table data on data nodes [duplicate]

Possible Duplicate: MySQL Cluster — Storing table data on data nodes I have setup MySQL Cluster with the MySQL server node and the Management node on a single server, and 2 data nodes (...
4
votes
2answers
1k views

Is there any index with O(1) complexity for lookup in PostgreSQL?

Is there any index type in PostgreSQL that gives O(1) complexity for lookups? on strings?
2
votes
1answer
1k views

MySQL Cluster — Storing table data on data nodes

I have setup MySQL Cluster with the MySQL server node and the Management node on a single server, and 2 data nodes (each on a different server for 3 servers in all). After installing, I run ndb_mgm ...
0
votes
2answers
1k views

Create an Audit trail on SQL Server 2008 to trace all privilege users

I need to create a trace of all the commands issued by members of SysAdmin or SecurityAdmin server Roles. I figured, I could use Profiler to do that but it will not comprise all the added members. I ...
2
votes
1answer
2k views

MySQL: trying to create root user

upgrading mysql database to 5.5 the root user has disappeared. I'm trying to create it again using this commands: javier@javier-mbp:~$ sudo pkill mysqld [sudo] password for javier: javier@javier-...
4
votes
2answers
2k views

Concurrently update with limit mysql

I want to know if concurrently UPDATE .... LIMIT N will not overlap with more than one client querying the db. After UPDATE ... LIMIT N the client will make a SELECT with some client_id assigned. I ...
2
votes
2answers
170 views

SQL Server Timeout: Gathering server side information

We use SQL Server 2008 for our database. We use a combination of Classic ASP and .NET to connect to said database. We get random timeouts on queries that are extremely simple and when we run said ...
7
votes
2answers
192 views

Can I use transaction logs to rebuild a database?

We've had some data loss and don't have a reliable backup it seems. We do have HUGE transaction logs and there was some thought that we might be able to use these to get back to a certain point. Is ...
6
votes
1answer
1k views

Using FORCE INDEX

I was in a presentation recently given by a Facebook MySQL engineer and he mentioned there that using FORCE INDEX reduces I/O. It was something to do with the MySQL Query Optimizer not needing to go ...
8
votes
2answers
7k views

What is the usage of performance_schema in MySQL 5.5?

I have upgraded to MySQL version 5.5. There, I had observed performance_schema in the schema list. What is the usage of this new schema..? How can we monitor using this schema..? What are the ...
16
votes
3answers
25k views

Efficient INSERT INTO a Table With Clustered Index

I have a SQL statement that inserts rows into a table with a clustered index on the column TRACKING_NUMBER. E.G.: INSERT INTO TABL_NAME (TRACKING_NUMBER, COLB, COLC) SELECT TRACKING_NUMBER, COL_B, ...
6
votes
1answer
2k views

Remote queries at SNAPSHOT isolation level

I'm experimenting with snapshot isolation level. Whenever I try to access a linked server, I get an error: Remote access is not supported for transaction isolation level "SNAPSHOT" I wasn't able ...
3
votes
1answer
3k views

Alter table modify column on a huge table containing more than 25 million records

I want to modify a column on a huge table containing more than 25 million records. I am using sybase 12.5.4. I have read through these posts What is the most efficient way to alter a column ...
11
votes
3answers
42k views

SQL Server 2005/2008 UTF-8 Collation/Charset

I can't find option(s) directly to set UTF-8 rellated Collations/Charsets in SQL Server 2005/2008, same as is possible to set in another SQL engines, but in SQL Server 2005/2008 are there only Latin ...
5
votes
2answers
14k views

Optimizing MySQL query_cache_size

Is my query_cache_size too big? mysql> SHOW VARIABLES LIKE '%query_cache%'; +------------------------------+-----------+ | Variable_name | Value | +------------------------------...
1
vote
1answer
832 views

storing a mirror of IMAP/pop3 folder/inbox in a local DB, what choices are there?

I have a email inbox that will soon hit 4 million messages, I have an app that runs different policies over the inbox to associate emails with each other much like the conversation plugin for ...
2
votes
1answer
2k views

ORA-01555: snapshot too old: rollback segment number with name “” too small

This error appears when I am trying to move LOB segment from one tablespace to another one. Also during exporting the same error appears. What can be a problem?
1
vote
2answers
1k views

Oracle hierarchical query question (start with … connect by … )

From the Oracle documentation: To find the children of a parent row, Oracle evaluates the PRIOR expression of the CONNECT BY condition for the parent row and the other expression for each row ...
3
votes
2answers
377 views

switch TOP clause between percentage and rows by parameter

For one report I am making query where users suppose have to choice TOP values based on percents or fix amount of rows. I have two ideas Calling two different sub sproc based on passed param. if ...
2
votes
1answer
3k views

Eliminate database fragmentation (export, drop and re-import tables)

I have one datafile that is highly fragmented. Its size is 10GB now and real size that is used is 2.5GB,so 7.5 is free. I decided to export data, drop that datafile, recreate it and import data. ...
4
votes
2answers
749 views

Migrating to Oracle Flashback for Historization on Oracle 11g

Our application built using Oracle 11g requires that we keep historic data. The historization is legally mandated, and is mainly used for manual queries, when investigating problems, etc. Basically ...
4
votes
1answer
2k views

Unicode support of PostgreSQL and its performance

How is the Unicode support of PostgreSQL? If I want to save Unicode data does it have to go through the conversion process while storing and retrieving? If yes then what is the performance of such ...
1
vote
4answers
7k views

How do I archive and restore selected tables using SQL Server?

How do I archive and restore selected tables using SQL Server?
1
vote
3answers
2k views

Can I Simply Change A Transaction Log From Unrestricted to Restricted?

I've got a database with a data file size of 674 MB and a transaction log of 6.1 GB. The transaction log is about 10 times bigger than the data file.The transaction log settings can be seen in the ...
2
votes
1answer
1k views

Why does an AS cube rebuild use so much TempDB?

I have a 50GB SQL 2008 database (only 36 of that is data) with a 24GB Analysis Server cube that rebuilds nightly. The cube rebuilds have been using more and more of the TempDB on the SQL server each ...
1
vote
1answer
79 views

Any general reasonable performance tests for DBs on application server and DBs on separate server?

My company are planning to move the DBs (SQL Server 2008 R2) from the application server to another server (random distance). All servers are Windows 2003 x86. Are there any general performance tests ...

15 30 50 per page