DO NOT USE this for questions targeting Microsoft SQL Server, use the tag sql-server instead. "SQL" is an acronym for "Structured Query Language", it is used in relational database management systems (RDBMS) to query, update, delete, and insert data as well as modify the structure of the database. ...

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114 views

Handling SQL updates for production deploys

I'm researching for quite a long time now (about two months) and haven't found a good approach for this, so I'll ask you experts out there in the hope of some enlightenment. I run a pretty ...
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98 views

Optimizing SELECT queries

I'm not very experienced with database query optimization. I've been reading through similar questions here and Postgres tuning articles online, but unfortunately I haven't had any luck. Here's what I ...
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69 views

MySQL not using multicolumn index on self join

I'm trying to optimise a query that performs an inner join with itself. The table size is currently 10GB ~50 million rows. /* Count all occurrences between start and end site id of a given speed ...
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259 views

How to represent directed graph with multiple parents?

http://dirtsimple.org/2010/11/simplest-way-to-do-tree-based-queries.html provides an algorithm for inserting and deleting from a Closure Table. I'd like to model a similar data structure, except that ...
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104 views

DB Design: Looking for Performance improvement with a Column used in all SQL Queries

I recently got added to a new ASP .NET Project(A web application) .There were recent performance issues with the application, and I am in a team with their current task to Optimize some slow running ...
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826 views

Connection to SQL Server failed. A network-related or instance-specific error occurred while establishing a connection to SQL Server

I'm getting this error while trying to connect to sql server. Now this never happened before and it's really annoying. I found out in my sql configuration manager that SQL server service has stopped ...
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81 views

Implementing a functionality for processing heavy insertion

I use PostgreSQL 9.1. The scenario is: I receive heavy insertion into Table1 (about 100 rows per sec). For each new row, I have to check the previous and next row of the source table if those are ...
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44 views

Low batch Batchrequests/sec

I am running this query to do massive deletion in my database. I am looking at Batchrequests/sec and it is quite low (like 15% of what my server can handle) Is there any way to rewrite this query to ...
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68 views

Relational or non-relational database for a system to pass objects on?

hopefully this is the right place to ask this kind of question. I am working on a system that focuses on helping people give away things that they don't use anymore. So, an object typically has the ...
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594 views

SQL select top X rows having sum limit

I am using SQL Server 2012, I have a table with a format such as : MyOrders : ID -> PK int Cost -> float Category -> int I want to get the following : Input : category (lets say 2). ...
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416 views

How to add SQL Server in networks list?

After changing my PC name and workgroup, I am no longer able to connect to SQL Server. Currently in my servers list I have only Home & localhost. Anybody know how to add server to networks list? ...
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235 views

How to handle many columns / variable schema?

I apologize in advance in case this question has been asked already. I'm working on revamping a reporting application used within my company. The requirements are: Support addition of new fields ...
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29 views

How to append records from one complete table into a partly populated differently formatted table?

I have two tables of interest linked in a MS Access 2007 database. The master table called EMPL_MASTER (from which I only have read access, I cannot make changes) updates every time a system ...
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37 views

How to cope with SQL Server 2012 vs SQL (Azure) Database sql files

I'm trying to port my system to SQL Database (Azure instance) from SQL Server 2012. I'm using Visual Studio 2013 and I have my .sqlproj with all the definition of my database inside. Given that a ...
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105 views

One table for article comments, video comments and photo comments or multiple tables?

First DBA question. Greetings people. I hope I'm not duplicating a question but it's very hard finding database design related questions here (for multiple comment tables), as all 'design' questions ...
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76 views

Merge/combine two queries with different dates

I have one query that runs a SUM statement based on daterange 1, and worked fine, and another query that run same SUM statement, but on a different date range. I would like to merge/combine the two ...
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0answers
135 views

Errors in the metadata manager. The process type specified for the Effect dimension is not valid since it is not processed

Trying to hunt down an issue with an SSIS package we have and I don't know what to look for to help correct this issue. Error: Errors in the metadata manager. The process type specified for the ...
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0answers
54 views

Database Structure Definiton

This is a question more so on the table definition vs actual programming. I have 6 sets of potentially 255 unique fields. I have a potential of getting 40 million records per year of these. For the ...
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0answers
56 views

Modulus calculation for compound primary keys in MySQL Cluster (and other sharded databases)

In MySQL Cluster, and generally in sharded databases, how is a compound primary key's modulus calculated? Say, for example, there are two tables that have primary keys like so: CREATE TABLE Orders ...
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144 views

Database Mail not sending

I'm trying to send email using the DatabaseMail on SQL Server 2008, I can see my emails sitting in the msdb.dbo.sysmail_unsentitems But they just sit there, I get no error messages. I've checked ...
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213 views

Error on job - need to troubleshoot

Need Suggestions: One of our Production Servers contains a job (Daily run) which gets the Data from another Server and dump into local DB. From last couple of days, it is failing with the reason ...
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97 views

Join and aggregate result and insert blanks for missing appendants

Consider these two simplified tables: CREATE TABLE "sources" ( "id" serial NOT NULL, "name" text NOT NULL, CONSTRAINT "sources_pkey" PRIMARY KEY ("id") ); CREATE TABLE "values" ( ...
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87 views

Testing equivalence in strings with different character sets

I have to synchronize a number of tables with string columns between two databases: the source Oracle 10.2.0.3 NLS_CHARACTERSET WE8MSWIN1252, NLS_LENGTH_SEMANTICS BYTE the destination Oracle ...
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0answers
86 views

Failover cluster connection issue

I'm trying to run SQL Server Failover cluster in Azure. I have NODE1 and NODE2 in a cluster and another SERVER in the same network trying to connect to the database server using the instance from ...
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154 views

Match unique id's on import- csv to sql

I have a csv file that I would like to import into a phpMyAdmin database (Wordpress). The CSV file is formatted as shown below: list-id | post_title | slider | ...
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66 views

appending 2 tables based on common columns in Postgresql 9.3

I have 2 large tables that I need to combine into a single table--for statistical analysis. The two tables have some variations in column named, otherwise I would just use an INSERT statement. So I ...
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94 views

Transactions using Isolation Level on databases with FileStream

We have a highly transactional application. We have a requirment to upload huge data into our database that can happen for a duration of 5-10 minutes. During our upload time, the tables are getting ...
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35 views

What to do when the error message is longer than 4000 in T-SQL?

I have a OPENQUERY linking to an Oracle server that is failing. (I can't make any changes on the oracle server) But when it returns the error string it is cut short because it returns the query in ...
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45 views

Getting upcoming world wide releases from a database

From my database I want to get upcoming world wide release dates for an itemId along with the platformIds. If I have a table that looks like this and the current date is 2014-05-14 ...
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205 views

Storing changes to stored procedure and triggers in PostgreSQL

I want a mechanism where I can store/track changes in stored procedure and triggers. I want to track these logs in some table. What is the best possible way ?
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547 views

Best practice - SQL Schema to store Timerecords for a Time and Attendance module

I'm starting a time and attendance module in C# and SQL. There will be many time rules depending on every shift. For example: Shift 7:00 - 14:00 for Administratives: 15 min grace time, but if ...
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119 views

Multiple login mappings for linked server

Can we assign two logins for two different databases on target server. For example, I would like to create a Linked Server between ServerA and ServerB. ServerB has two databases on it and both using ...
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105 views

SELECT, PROJECT, CARTESIAN PRODUCT and JOIN

I have the following tables; DOG +----------------------------------------------+ | Name Type Age Kennel_name Owner_name | +----------------------------------------------+ ...
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107 views

Phantom insert query

I have a log table which I have to clean up a bit because it is growing very fast. While deleting some historical data I reached count zero for that condition on which I have deleted the entries. 5 ...
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76 views

Efficient way to Add NON-CLUSTERED Index?

I have the following table, CREATE TABLE [dbo].[Products]( [ID] [int] IDENTITY(1,1) NOT NULL, [RetailerID] [int] NOT NULL, [Name] [nvarchar](255) NOT NULL, [Price] [float] NULL, ...
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162 views

Combine a running balance SQL statement as a column

I have two Select Statements which are collecting data from 1 table, one is a totals select statement. Could anyone assist me with combining them into 1 statement? Any assistance is appreciated ...
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318 views

SQL command in stored procedure continue on error

To perform Checkdb on all database of server i am using a stored procedure which loops over a view which contains list of databases in server and the stored procedure performs checkdb on all databases ...
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0answers
109 views

WMI event alerts

I am trying to understand WMI event alerts and have implemented a mirror with alerts on DATABASE_MIRRORING_STATE_CHANGE such that all database failover if the state is either 7 or 8 (manual failover ...
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46 views

Find repeating tickets with more than one criteria

Lets say I have 2 tables: atms & tickets each atm has many tickets. ATM table: ID | NAME ------------------------- A0109 | ATM 1 A0227 | ATM 2 etc. | etc. Ticket table: ID | ATM | ...
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166 views

How to join the tables in mysql to get wall messages and comments with name of person ? Only user and his friends messages

I have four tables in my mysql database as shown in the image url provided. I want to select data from the tables without duplication. I want to show messages and comments on wall according to the ...
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375 views

Can not ping Always On listener from outside primary node

I just setup SQL Server 2012 (on Windows Server 2012) Always On feature and have a problem with connecting to SQL Server Listener from non-primary node (it works from primary node though). Here is ...
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0answers
189 views

MySQL aggregation count performance

I have a table with about 30 million records, and I'm doing a query where I can group by field Year and count the results for that year. The table structure looks like: id | year | amount The ...
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0answers
286 views

Missing rows in MyISAM tables with 10-20 billion records

I've got 2 tables with 10-20 billion records each. Currently these are in MyISAM (MySQL). They only require to be built and indexed once, after this only SELECT is used. They are currently ...
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0answers
28 views

SQL Replication - Data not showing

Good Morning, I have recently setup SQL replication and changed some data in one of the tables on the primary table. This data however has not been replicated to the subscription server. On the ...
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0answers
1k views

SQL Server 2012: Login failed for user. Reason: Failed to open the database configured in the login object

Every so often, my SQL Server 2012 throws the following errors: Error (likely related to the one below): Source: spid99 The client was unable to reuse a session with SPID 99, which had been ...
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0answers
110 views

How to merge rows based on how much data they have?

I am cleaning data and I formed a table something like this: file | product | color | product_id --------------------------------------------- one.csv pipe blue null ...
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0answers
95 views

MySQL: What criteria should I base my table column order/arrangement/grouping on?

Does the order, arrangement or grouping of columns with large (such as long text descriptions) and small (such as bit and tinyint) field types have any noticeable impact on MySQL (InnoDB engine) ...
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266 views

Postgres binary replication: Standby takes a long time to start

I am using the Postgres binary replication tutorial, and have rsynced all the data files from my master to standby rsync -av --exclude pg_xlog --exclude postgresql.conf data/* ...
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188 views

find total money of parent node of tree according to a particular pattern

actually i am working on a project in which members are added in a tree pattern, and get the payment accordingly. My tbltestingtree structure is ass follow: Id ParentId IsLeft ...
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4k views

How to speed up query on table with millions of rows

The Issue: I'm working on a big table that consists about 37mln rows. Data include measurements of many devices made in certain time e.g. '2013-09-24 10:45:50'. Each day all of those devices are ...