36
votes
3answers
55k views

Possible to make MySQL use more than one core?

I've been presented with some dedicated MySQL servers that never use more than a single core. I'm more developer then DBA for MySQL so need some help Setup The servers are quite hefty with an ...
4
votes
2answers
951 views

Creating a GroupBy query to include a result for when no results match

Let's say I need a query to see sales results by Month and I want the result-set to include results for each month whether there were any sales in that month or not. And let's say my table "sales" ...
2
votes
1answer
5k views

SQL query to convert columns into rows

I have a table as shown below.My question is:How can I convert columns into rows?BTW,I'm using Microsoft SQL Server 2005. my input Data ONAY_ID sip_RECno KULLANICI ONAY 1 1 ...
5
votes
1answer
7k views

How to get the foreign and primary key details for a table in SQL Server 2008

I would like to use 2 queries, one that lists all the foreign keys for a given table with the following information Schema name, foreign table name and the other that lists all the primary keys. Is ...
6
votes
2answers
4k views

MySQL Auto_increment going 2 by 2

I installed MySQL Workbench the other day, accessed my company's database and made myself a table to work with. So far so good. The problem is, I noticed my auto_increment is incrementing 2 by 2. For ...
4
votes
2answers
5k views

Internal reason for killing process taking up long time in mysql

I copied a big table's structure with (it is an InnoDB table btw) CREATE TABLE tempTbl LIKE realTbl Then I changed an index, and filled it up so I could run some test. Filling it was done using: ...
0
votes
1answer
165 views

Simply SQL Query problem

I have been pulling to the total stock within the first 6 months.My question is:How can I pull to total stock within the last 6 months in the same query? Also,I want to be to the result of the query ...
2
votes
1answer
339 views

Weird error on simple query in MsAccess

Any idea what's wrong with the query SELECT DISTINCT Table1.Description FROM Table1 ORDER BY Table1.Description DESC; I'm running this on MsAccess on a table where all fields are Memo. There are ...
4
votes
1answer
2k views

Which workarounds exists to missing relative path feature of SQLCMD :r?

I'm not the first to notice the lack of this feature. But I wonder if there are some useful workarounds. I want to deploy a main script and some depended scripts in the same folder. BTW Is there a ...
0
votes
1answer
654 views

Any disadvantage to using oraToolkit for installing oracle

I am going to install oracle 11gR2 on a redhat enterprise 5.6 machine. Is there any disadvantage to using oraToolkit? For example, could it cause any problem or difficulty for future complimentary ...
4
votes
3answers
8k views

What is difference between Oracle Apps and Oracle Application Server?

I am very new to oracle, could anybody tell me what Oracle Apps and Oracle Application Server are.
2
votes
2answers
388 views

What does “GIN doesn't support full index scans” mean?

I'm a RDBMS newbie and I have a PostgreSQL database of more than 50 millions lines, growing everyday. There is a column 'text', which contains human-generated text of around 20 words. I need to be ...
3
votes
2answers
2k views

Does the SELECT statement count into DML?

Looking at the name Data Manipulation Language (DML) I would assume, that all contained statements are actually for manipulating data. As far as I know the SELECT statement can only be used to query ...
7
votes
2answers
264 views

Why is Oracle using the index here?

Name Null Type -------- -------- --------- ID NOT NULL NUMBER(4) GROUP_ID NUMBER(4) TEXT CLOB There is a btree index on group_id. Here's how many ...
5
votes
2answers
268 views

What is an advantage or disadvantage for not upgreading database server?

I have a legacy database server. The person who wrote it is long gone. There is no documentation at all just some comments in the code. Luckily, it is not that complicate but if I want to fix it ...
2
votes
2answers
362 views

Database Transfer from PostgreSQL to MySQL

Is there any method to tranfer the data and schema from a postgresql database to mysql?
1
vote
2answers
388 views

Scheduled backup errors

I am trying to do the following. I have about 50 DBs and a network NAS that acts as backup machine. I have made an sql script(lets say backup.sql) with 50 lines each of these say "BACKUP DATABASE ABC ...
1
vote
1answer
103 views

How can I measure the performance hit of tablespace autoextensions?

I'm not a DBA, nor is there a DBA on the project I'm currently working, so we have tablespaces with autoextend on next 6m. I have no idea if this is low, although I believe so. I want to measure ...
3
votes
1answer
607 views

Is it safe to let application administrators look at v$session, v$process, and v$sql?

In an Oracle database shared among multiple application, is it 'safe' (from a security and system integrity perspective) to allow application administrators access to v$session, v$process, and v$sql? ...
0
votes
2answers
101 views

what are steps should i do to make my local sql server connects to a remote sql server on my server?

I want my sql server to remote connect to the server sql server, so that I can access databases from my local machine. How to do that in steps, or if there is an article online that will be nice as ...
6
votes
1answer
642 views

What makes an OLTP database an OLTP database?

This is a pretty broad question. I know the definition of OLTP. But it seems like unless you have an environment that has a clear distinction between OLTP and OLAP, in the sense of a database that ...
6
votes
2answers
4k views

Is this a normal set of MySQL privileges?

Using phpmyadmin on a local test wamp setup, and well as pretty much the title states, there are 3 users marked as user = ANY, password = NO, such as: USER | HOST | Password | Global Priv | Grant ...
30
votes
7answers
12k views

Writing a simple bank schema: How should I keep my balances in sync with their transaction history?

I am writing the schema for a simple bank database. Here are the basic specifications: The database will store transactions against a user and currency. Every user has one balance per currency, so ...
6
votes
2answers
3k views

How can I help SQL Server recognize my indexed view column is NOT NULL-able?

I have the following indexed view defined in SQL Server 2008 (you can download a working schema from gist for testing purposes): CREATE VIEW dbo.balances WITH SCHEMABINDING AS SELECT user_id ...
3
votes
1answer
474 views

InnoDB has a transaction running, but “SHOW PROCESSLIST;” shows nothing

I have a replicated database setup, mostly Innodb databases/tables. The query that I believe caused the issue ran in about 20 minutes on the master database. This is where it gets weird. Show ...
11
votes
8answers
2k views

Is there a reason to use extremely abbreviated table names?

We're using a database setup from a vendor's application that has horrifically hard to read database table names, and no documentation on what is stored where. I can see why one might want to ...
5
votes
2answers
2k views

Does a view need its own foreign key constraints?

Disclaimer: I'm a programmer, not a DBA, so bear with me... I have a view that I use to just map 2 entities together. I have to do a join between a few different tables to get that: CREATE OR ...
2
votes
2answers
317 views

Indexing of Data Warehouse tables?

Maybe I have misunderstood something but I can recall reading an article which said that there is no reason to create non-clustered indexes on very large data warehousing tables? That is because ...
1
vote
1answer
102 views

Should I Avoid Repeated References to Aggregate Columns in a View?

So I'm wanting to summarize the balance of the accounts in my business application. My (simplified for our purposes) data model looks like: --Main account table that holds the single accounts create ...
1
vote
3answers
4k views

ON DUPLICATE KEY UPDATE question

I'm trying to compare data from two systems. The basic idea is: Create Temp Table. Insert Table1 Data. Insert Table2 data (Table a linked, remote server) with UNIQUE Ids respected. Filter where ...
0
votes
1answer
97 views

What would cause the speed difference between servers?

I have this query on my dev server: select snStudyNumber as ProjectNumber from CDB.cdb.Quotes q inner join CDB.cdb.LineItems l on q.PK_quID=l.FK_quID inner join ...
4
votes
1answer
4k views

How can I generate scripts for all functions in pgAdmin?

I am using pgAdmin version 1.10.5, and I've checked the properties and menu options but couldn't find anything on the subject. For example, I just want to generate a script that includes the ...
2
votes
3answers
2k views

Backup Compression in SQL Server 2005

I noticed that simply zipping my backup files reduces the space used by 70% My idea was to, initially, backup the databases to a local server; then, using Bacula or Cobian (I don't have a budget), ...
3
votes
2answers
11k views

ORA-01113: file # needs media recovery ORA-01110

I have mistakenly added datafile to the tablespace... And was trying to drop it. I run the following: alter database datafile 'datafile_name' OFFLINE; now when I run alter database datafile ...
3
votes
1answer
930 views

Replication slows down on massive deletes

First of all, I'm not a DBA, but I'd like to get advice how to deal with the following issue. We have few database servers based on SQL Server 2008 R2 SP1. They have been organized as shown below, so ...
5
votes
1answer
294 views

DBA's Scope in datawarehousing Projects

As a DBA trainee, what needs to be known in order to be part of datawarehousing projects? I mean what resources are suggested to have an overview knowledge of how PL/SQL and other concepts are used ...
0
votes
2answers
560 views

Upgrading Instances with Mirroring

If you want to upgrade or install a patch on two separate instances that house both the principal and mirrored database, how can you go about that? If the database that is being mirrored needs to be ...
5
votes
4answers
1k views

Does putting single quotation marks around numeric constants really protect from SQL injection in MySQL?

The manual seems to suggest that using quotes around numbers is sufficient to protect from SQL injection. According to section 5.3.1. General Security Guidelines of the MySQL 5.1 Reference Manual: ...
5
votes
1answer
484 views

Mirroring partner timeout - Not working the way advertised?

I'm testing a 2 node windows failover cluster with mirroring in high safety mode and automatic failover. My mirror is a standalone server as is the witness. All instances are 2008 R2 RTM Enterprise ...
5
votes
2answers
2k views

Will transactional replication push a CREATE INDEX immediately? Or do I need a snapshot?

I have transactional replication set up on SQL 2008, and the article in question has "Copy nonclustered Indexes" set to TRUE. If I add a non-clustered index on the publisher (using CREATE INDEX), ...
5
votes
2answers
2k views

Changing Domain on SQL Server

I currently have some SQL Servers that sit on a sub-domain. We are eliminating that sub-domain and moving everything to the regular domain. As far as SQL Server configuration goes, is there anything ...
4
votes
2answers
5k views

Minimum requirements to run Sql Server BCP.exe utility

I am working with a client who needs to do a data import to a remote SQL Server (2008) instance. The machine that the import will be done from cannot have SQL Server installed on it. Can the BCP.exe ...
4
votes
3answers
5k views

Does an Oracle nvarchar2 take twice as much space as varchar2?

Regarding point 4 of this question (which is in reference to MS SQL Server): VARCHAR does not store Unicode characters. NVARCHAR does store Unicode characters. Today's applications should ...
5
votes
1answer
3k views

Unable to kill SPID

I have a SQL Server 2005 Std (x64) with SP4 that has a procedure I cannot seem to kill. If I view sys.dm_exec_requests I see SPID 103 with wait_type of LCK_M_SCH_M, a status of SUSPENDED and command ...
4
votes
4answers
318 views

How to measure the number of database writes on SQL Server 2008 R2

How would I measure the number of database writes on SQL Server 2008 R2 For example, how many updated rows and how many new rows in a database over a period of time (1 day, 1 week or 1 month)?
1
vote
3answers
1k views

Undo DDL statement on View in Oracle

I Want to undo DDL changes on View, how to do that? I have not set utl_file_dir parameter and can't restart the database to set it. So log miner can not be used yes? it needs this parameter... If ...
2
votes
2answers
233 views

What is an industry standard method for verifying openquery connection is open prior to running queries?

I'm a programmer, but this question is more specifically related to databases so I'm posting it among this community. It could very well cross over into stackoverflow as well. I'm seeking an ...
2
votes
1answer
3k views

Rebooting a MySQL Replication Slave

For the first time since it was set up I need to reboot a read-only MySQL replication slave. I found this article about downing a slave for maintenance (albeit he's just describing stopping the mysql ...
2
votes
3answers
15k views

How to drop multiple tables with common prefix in one query?

I'm using Microsoft SQL Server 2008.My question is:How to drop multiple tables with common prefix in one query? something like that table names: LG_001_01_STLINE, LG_001_02_STFICHE
13
votes
2answers
5k views

How to know when/if I have too many indexes?

Running Microsoft SQL Server Profiler every now and then, it suggests me with a bunch of new indexes and statistics to create ("...97% estimated improvement..."). From my understanding every added ...

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