2
votes
1answer
146 views

Relaying changes to a slave from another master with Tungsten on MySQL

I am trying to setup a multi-master type of replication with each master having an additional slave using Tungsten. As an example, lets say I have 4 hosts (A,B,C,D) and hosts A and C are the masters, ...
0
votes
1answer
63 views

How to query transfers for single source to single destination?

This should probably be easier than I'm making it, but I'm scratching my head coming up with an efficient way to query the results I want. I'm working with a table that has a source field and a ...
4
votes
1answer
3k views

Amazon RDS mysqbinlog “Could not find first log file name in binary log index file”

Preamble: We use RDS at AWS to manage our MySQL database. I know that RDS creates binary logs used for replication.. I want to harvest these binary logs and store them on S3, so that at any time, i ...
2
votes
2answers
497 views

Inserting to table: Insert rows with Left Outer Join or Insert rows then Update?

I have a table of Orders and another table of Deliveries. The Orders table will contain a reference to the Deliveries table if there is a corresponding row. Not every row in Orders will have a row in ...
0
votes
0answers
1k views

Get categorie, subcategories and number of products assigned to each

I have a list of products, and a list of categories, and a join table. Products can be assigned to multiple categories. Categories can have one level of subcategories. The tables look something like ...
0
votes
1answer
360 views

update variable from multiple tables in one row

I have two databases, and I need to UPDATE variable 'birthday' from one row to another checking 'name' (from db1 to db2). The problem is, that 'name' variable in second db is located in another table ...
0
votes
1answer
549 views

HOW does ROWNUM work with this “optimization”

I'm trying to optimize a query in which I have some requirements where I need to be able to arbitrarily select a row ROWX from a query. Why is it that SELECT XML_DATA FROM (Select ROWNUM AS ...
4
votes
2answers
921 views

How do I delete unique rows from a table with duplicate keys?

I have the following data: road | ID | other column | other column | ------------------+------+---------------+--------------+ MAIN ST | 1 | ... | ...
1
vote
1answer
5k views

Database design for eCommerce website with multiple products having huge specifications index [duplicate]

I am designing a web site for online shopping and I have a question related to that. As you know that shopping website may have different product with different statistic/specification. What is the ...
0
votes
1answer
92 views

How to index WHERE (start_date >= '2013-12-15')

I have a table named items, and inside the table there is a some_date column, with date as the datatype. I was wondering how can I index the some_date column with PostgreSQL SELECT "items".* FROM ...
0
votes
3answers
209 views

Rollback the sql server data [closed]

Is it possible to restore the rollback changes to a database? One of my client has done wrong updates on database so most of the tables have been updated with wrong data. That database is having with ...
2
votes
3answers
230 views

Will MySQL be effective when selecting a row from a table with billions of records? [duplicate]

Note: this is a hypothetical scenario Lets say that: I'm running MySQL, InnoDB engine, UTF-8 encoding I have a table with 50+ billions of rows The tables primary key is a BIGINT The table also has ...
1
vote
1answer
602 views

SQL Server Agent - Running SSIS Package with Proxy

I have followed the below article to create credentials/proxy to run a SSIS job from SQL Server Agent. ...
0
votes
1answer
507 views

MySQL will not start

Please help, I really need to recover my databases. service mysql start start: Job failed to start mysqld --verbose 140401 20:16:11 [Warning] Can't create test file ...
2
votes
0answers
190 views

How to see all queries via pgBadger

The excellent pgBadger has an interface to reviewing specific queries - the slowest, by host, by user etc. Is it possible to see all queries processed, perhaps in a given timeframe. If not available ...
-1
votes
1answer
1k views

Oracle Database XE 11.2 Question on how to get started [closed]

I have installed Oracle Database XE 11.2 on my laptop PC. As I am new to Oracle and to SQL in general, I am finding it difficult to get started. I have searched but couldn't find any "step-by-step" ...
-4
votes
1answer
1k views

What are the disadvantages of PostgreSQL compared to other DBMS? [closed]

I am a student studying PostgreSQL. I want to know the advantages and disadvantages of PostgreSQL in comparison to other DBMS.
2
votes
1answer
160 views

High Query Wait Times

We are seeing the below query as regularly having very high wait stats. What does this query relate to? System tables? Is it possible to reduce it's wait time? Thanks! select @reservedpages = ...
0
votes
0answers
262 views

How to increase application performance with Centralised SQL Server [closed]

I’m trying to get my head around to make better way to increase the performance of my application System based on single SQL Server with 50 clients tablets pc(its connected to local wireless). my ...
3
votes
2answers
178 views

Differential databases (not backups)

When working with virtual machines often it can be very useful to have a base read-only VM then have several smaller VM's that use that larger VM as a base and write their changes to their own ...
0
votes
1answer
498 views

MySQL: LEFT OUTER JOIN within reason

What I'm attempting to do is LEFT OUTER JOIN a table, but I only want the last inserted record of the joined table to affect the results. Currently each table row within the joined table seems to be ...
0
votes
1answer
255 views

No such column error jdbc

Suppose I have a table: SERVICE={SID,NAME,PORT} and with the help of a Java program, I want to select the SID of the known port with the help of a SQL query: Select SID from SERVICE ...
3
votes
3answers
829 views

What minimum permissions do I need to provide to a user so that it can check the status of SQL Server Agent Service?

I have created a user and granted many permissions and roles to it including SQLAgentUserRole and SQLAgentReaderRole. My application checks the status of the agent to see if it is running or not, and ...
0
votes
1answer
186 views

Using non-replicated read/write databases on a MySQL slave server

I have a MySQL slave server that has two databases being replicated from a master. What I'd like to do is add a third database that I will exclude from replication and use as a read/write database. ...
0
votes
0answers
533 views

Transaction Time out error C#

Database Type : SQL server 2008 R2 Issue description: There are two machines. One is server machine(OS- Windows server Enterprise) another one is client machine(OS- Windows 7 professional). In Both ...
1
vote
1answer
164 views

Maintaining mongodb for a huge list of message “documents”?

Intro: I am working on an app right now for live messaging and it's almost complete. The database strategy is in order. So when a new message is created it is sent as an object fitting my mongoDB ...
1
vote
1answer
563 views

Using EncryptByPassPhrase in where condition

I am using EncryptByPassPhrase of sql server. But i am not able to use where condition properly. DECLARE @login_details TABLE(uid integer,username varchar(10),password varbinary(100)) insert into ...
0
votes
5answers
1k views

Is it impossible to store 2^266 records on a database of some kind? [closed]

Each records weighs 52 bytes, is it possible in today's technology if someone had the storage needed? What kind of db would hold the data and will make it possible to retrieve it. An example record: ...
0
votes
1answer
95 views

Short CIrcuit in WHERE clause [duplicate]

How to make short circuit in where clause, e.g: select 1 where 1=2 AND 1/0=0 In the above example 1/0=0 condition should not be evaluate as the first condition is false.
0
votes
1answer
446 views

Find actual data size from a query?

Is it possible to find the size of data contained in a particular query? e.g. I can use the following to find the number of rows per date: select mydatecolumn, count(*) from MyTable where ...
0
votes
0answers
58 views

Reduce read write delays in specific database setup

I have a database with a large table with 15 columns (type double). It contains a large amount of data (~ 100 rows of data for every second. Holds 3 days of data). I also have a real-time program that ...
0
votes
2answers
248 views

MySQL Master <=(Slave,Master)=> Slave configuration

Sorry for the wonky title if it got you confused. I want to know if a server can be a slave and master at the same time. Our problem is that we have lots of mobile units that need to be synced to the ...
2
votes
1answer
87 views

Confused on how a value gets added with the DEFAULT constraint

A recent definition I've read about Default Constraints: DEFAULT is specified for a column to assign a column a specific value if no value is specified when a row is added. I believe I've seen code ...
0
votes
0answers
273 views

Powershell Error Handling W/ SQL Restore Jobs

I would like to rebuild many of our SQL scripts into Powershell to further integrate my department with the Windows Operations team and to open up a lot of other options. Questions: 1-preference ...
0
votes
0answers
87 views

Efficient way to fetch/update X records in a loop

What I need is a simple process that handles requests. I have setup a simple table as follows: CREATE TABLE Requests ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, request_param VARCHAR(250) ...
0
votes
1answer
2k views

Restoring a SQL Server 2008 R2 backup on SQL Server 2005

I'm getting an error whenever I restore a testing database on SQL Server 2005 that was backed up from SQL Server 2008 R2. It seems that I cannot restore from a higher version of sql onto lower ...
0
votes
0answers
260 views

Lost all my Postgres database tables? [closed]

I'm a novice using PostgreSQL on a local database that I created using Postgres.app on my Mac. My dbase included multiple related tables with ~50MB of data, and after restarting my Mac (system update) ...
0
votes
0answers
159 views

How can I get rid of the “No Join Predicate” warning

I have this fairly straight-forward snippet of a query: DECLARE @ClientGUID numeric(16) = 9000011916900200; SELECT ch.GUID, c.LastName, c.FirstName, mrn.ClientIDCode AS MRN FROM Client c INNER ...
1
vote
2answers
3k views

SQL Query with optional WHERE clause parameter for date range?

I have a procedure that takes, among other things, start and end date parameters. These two parameters are optional inputs and default to NULL. What I would like to do is modify one of the current ...
0
votes
1answer
836 views

Delete Query takes a long time

I have a innodb table that counts circa 1 billion entries. I started a delete operation (with a small where condition on an indexed column) that should delete a lot entries, leaving circa 100 million. ...
0
votes
0answers
78 views

How to update Status using IF Condition in Mysql trigger

I'm trying to write an update trigger that will Design_Update_Status to Customized when a date is entered in Custom_Design_Update_Date field and if nothing is entered that field it should update ...
1
vote
0answers
120 views

What type of fact table / loading solution for a reservation system?

I am designing a Data Warehouse with SQL Server 2012 and SSIS. The source system handles hotel reservations. The reservations are split between two tables, header and header line item. The ...
0
votes
1answer
140 views

Index to fix this query MySQL

We have an extremely large forum running lots of third party software (Most of which doesn't run all that well) and we're starting to optimize things as time allows. This query keeps popping up in the ...
1
vote
1answer
437 views

ORA-00942: table or view does not exist

I have application / service which connects to Oracle database (11g) which shows me "ORA-00942: table or view does not exist" in its log file without any indication of particular table/view with ...
0
votes
2answers
414 views

What is the best practice for free space for a SQL server database drive?

I'm trying to determine the best practice for sizing a single database on a 120Gb data drive that will contain the LDF and MDF files. I'm assuming that I don't want to set the size to be the maximum ...
0
votes
0answers
37 views

SCAN verification error during 11gr2 installation

Hi All, I am getting the following warning when installing RAC DB (11.2.0.4). Does any one has idea what could be the reason? I have tried to search from Metalink but no help. Can I proceed with ...
2
votes
1answer
2k views

Dropped Database Connections in SQL Server 2008R2

We are having an annoying intermittent problem where database connections from our client application on a variety of stations will get dropped. We have applications that use ODBC, Borland Database ...
1
vote
1answer
46 views

PostgreSQL : send all rows of a table to a function

I have a table with one column (double precision numbers). I also have made a function (with double precision numbers as input and output), and I want to send every value of my table to the function, ...
4
votes
2answers
32k views

I can't connect to my servers SQL database via an IP Address

I have setup a server that runs Windows Server 2008, and has SQL Server 2008 Express installed. I can connect to the machine's SQL Server Express database via the MACHINENAME/SQLEXPRESS. However ...
1
vote
3answers
5k views

What could cause an auto increment primary key to skip numbers?

I have a table created with the following T-SQL: CREATE TABLE [dbo].[TableName]( [id] [int] IDENTITY(1,1) NOT NULL PRIMARY KEY CLUSTERED ( [id] ASC )WITH (PAD_INDEX = OFF, ...

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