0
votes
3answers
323 views

MySQL - How do I Calculate an Average Value Over a Period of Time When Only Value Changes are Recorded

I am tracking the sales price of various items, and I would like to calculate the average price of each item over a period of time. My simplified tables look like this: Items ------------------ |key ...
1
vote
1answer
121 views

Shorthand for on primary key?

Is there a shorthand for merging rows based on the primary key? For example: MERGE INTO [MyDatabase].[MySchema].[MyTable] AS target USING [MyLinkedServer].[MyDatabase].[MySchema].[MyTable] AS source ...
2
votes
1answer
82 views

Scalable Relational Database Design

I'm designing a web application (using Django) for a client that will need a fairly large database behind it. I've never worked with databases that handle large amounts of data before so I'm hoping to ...
3
votes
2answers
506 views

Copying MySQL Raw Data Files for Master-Slave Replication and GTIDs

I have been developing and running a mysql-based web application (intranet-based) for some time now. I wish to establish a step-by-step sane sequence for creating a slave from the running MySQL ...
-2
votes
1answer
174 views

what else to enable to make LOAD DATA INFILE work?

Anyone got an idea what to enable to make the LOAD DATA INFILE working? I have the global variable 'local_infile' set to ON, the database is answering queries just normaly, but LOAD DATA INFILE ...
0
votes
1answer
461 views

Automate SQL Server restore from Prod to Dev

I would like to setup an automated restore job which takes the latest timestamp .bak file and restores it into the DEV instance. I currently have a job on the DEV box that uses the UNC path to the ...
0
votes
1answer
94 views

SQL queries failing, Memory not releasing

I have a SQL Server 2008 R2 with 8GB of ram and SQL Server is limited to 6GB. It seems to not be releasing the memory its used, and at some point future queries begin to fail. This is a mirrored ...
3
votes
1answer
208 views

Unable to start SQL Server Browser service in Sql server 2005 [closed]

we are unable to start the SQL browser service on one of our machine with below error: I believe this to be the reason, why we could not connect to the instance with below error: I tried ...
4
votes
2answers
149 views

search misses indexed column

I have a table like this CREATE TABLE `agentpositions` ( `idPosition` INT(11) NOT NULL AUTO_INCREMENT, `idAgent` INT(11) NULL DEFAULT NULL, `hardwareSerial` VARCHAR(128) NOT NULL, ...
0
votes
1answer
344 views

Transaction over linked server causing time out

When I execute this query on [RemoteServer] linked server, it works just fine: INSERT INTO [RemoteServer].[DbName].[SchemaName].[TableName] VALUES (1, 'bar'); but when puting it inside a ...
2
votes
1answer
1k views

The operating system returned error 665(The requested operation could not be completed due to a file system limitation) on SQL Server 2014

Have a SQL Server 2014 instance running on Windows 2012 R2 that was running Ola Hallengren's DB integrity script. This is the error that resulted: The operating system returned error 665(The ...
-4
votes
1answer
149 views

From keyword not found? [closed]

SET ECHO ON SET HEADING OFF SET FEEDBACK OFF SELECT * FROM GLOBAL_NAME; CREATE TABLE CAR(REGO CHAR(8) NOT NULL, MAKE VARCHAR(20) NOT NULL, CONSTRAINT CAR_PKEY PRIMARY KEY("REGO")); INSERT INTO CAR ...
0
votes
2answers
72 views

Oracle query optimization

We have a query that runs on a view and its execution time is about 6 min. SELECT COUNT(*) FROM someschema.item_total_violations WHERE channel_id = 122507833 AND item_date >= ...
4
votes
1answer
2k views

set session - custom variable to store user id

I want to store user id in custom session variable and use it (read) in trigger procedures to authorize user actions. I found something like this: set session "myapp.user" = '12345'; ... SELECT ...
4
votes
1answer
94 views

DB2 - what happens when SQL archive log file reches its maximum value (S9999999.LOG)

we have DB2 in archive mode. archive log files are created and deleted from the disk. What will happen when archive log file reaches its maximum value for the name (S9999999.LOG) will it start to ...
3
votes
1answer
151 views

SQL Server index causing incorrect behavior on cursors

I have a SQL Cursor that's behaving incorrectly as soon as we added an index to a table. Here's a trimmed-down example of the query causing issue: DECLARE @CUR_CRDATE NVARCHAR(8) DECLARE ...
2
votes
2answers
2k views

Restoring database between different version of SQL Server (SoftwareVersionBuild)

i have a question about restoring database from newer version of SQL Server to older, when version differs only in SoftwareVersionBuild. I know that's not possible to restore database from SQL Server ...
3
votes
2answers
377 views

Inner Join and Right Join same query

I'm using MySQL and InnoDB, I have a table reserver with 2 columns : idReservation and idChambre I have a table reservation and a table chambre Now I want my query to return every "chambre.id" who is ...
4
votes
3answers
340 views

Scalable query for running counts of events within x previous days

I already posted this question on stackoverflow but I thought that I might get a better answer here. I have a table storing millions of events occurring to users: ...
1
vote
1answer
217 views

How to avoid MySQL slave to have errors after crash

I have a MySQL master/slave configuration (MariaDB 10.0.17). Sometimes, the slave or the master server crashes. After the crash and restart, I get some errors of duplicated keys on slave. The server ...
0
votes
0answers
66 views

mysql on delete cascade error

I have the following tables : as you can see there is a FOREIGN KEY from projects to files and another FOREIGN KEY from files to projects the sec one is set to on delete cascade (the idea is to ...
1
vote
1answer
301 views

phpMyAdmin and mysql not showing the same database

I have setup WAMP which I managed by using a tutorial and everything seems fine... I am logging into mysql as the root user with full privileges granted and I am able to create databases in mysql and ...
0
votes
1answer
49 views

GRANT permission to access to respective creator

Does the following command: GRANT SELECT ON EVENT TO STUDENT; grant student access to whole EVENT table? If yes, how to only give STUDENT access to EVENT(s) record created by respective STUDENT?
3
votes
2answers
3k views

MySQL unknown column 'password_last_changed'

When creating a user using this command create user 'foo'@localhost'; this error is shown ERROR 1054 (42S22): Unknown column 'password_last_changed' in 'mysql.user' Using MySQL server version: ...
2
votes
1answer
28 views

Attribute-Attribute Dependency

So as part of our college project, I'm working on CENSUS Database. I stumbled upon a problem wherein if an individual is below the age of 18, his/her marital status should only allow 'NA' and anyone ...
0
votes
1answer
34 views

Returning auto-generated primary key after SQL insertion

I am trying to submit data to a database and then have it return the value of the user_id (primary key) created by the insertion, but I can't get it to return the value. I use the same query in ...
0
votes
1answer
56 views

Need help on a database model design

I am creating a small booking application with Laravel. It lists some centers. Each center has its own unique rooms. Each room may be booked several times (with dates). From my application, I post the ...
1
vote
1answer
65 views

Made changes to my.cnf and mysqld wont restart - no backup

I thought I'd be clever and update my.cnf file to add ft_min_word_len=2 and didn't back it up first. I will never make that mistake again. Luckily, our project is still in production and no harm done. ...
1
vote
1answer
48 views

Is it possible to get a list of procedures created with WITH EXECUTE?

Is it possible to get a list of stored procedures create with WITH EXECUTE? I tried looking at sys.procedures, but they all have the principal set to null, and I know there are some procedures ...
0
votes
1answer
44 views

IS-A relation when defining tables

I already asked this question on SO, prior to realizing that there may have been a more suitable place. I am trying to implement an IS-A relationship between tables. Say I have a singer and a band ...
0
votes
1answer
90 views

Tmpfs for mysql tmp dir questions

I have a 768M tmpfs dir that I use for mysql temp directory. It occasional fills up when running reports on large date ranges. When this happen the report fails and I get an error 28. This actually ...
0
votes
1answer
85 views

Performance of MySQL BLOB fields processing

Suppose, I have large (about 1 GB) strings in ASCII encoding. I have to choose whether to store them as separate blob fields or split each one of them into smaller pieces and then store them as ...
0
votes
2answers
104 views

What is an easy query to fix up historical columns valid_from and valid_to?

I have a table with typical history rows using valid_from and valid_to dates. My table might look like this: | id | object_id | name | valid_from | valid_to ...
2
votes
0answers
77 views

Is it possible to trace queries that never complete with SQL Server 2008 R2?

Running SQL Server 2008 R2. We have some queries that typically take less than one second to complete, but, occasionally, they are taking longer than 30 seconds which causes a client timeout. ...
0
votes
1answer
1k views

SQL CHANGE DATE FORMAT IN BULK

I have a database with several hundred fields but my data structure is wrong. It is currently in uk format as follows: d/m/y 01/01/85 01/01/96 23/12/87 What would be the most efficient way to change ...
0
votes
0answers
46 views

The same timestamp in different MySQL versions

I read in mysql 5.6 SQL changes following text: TIMESTAMP columns not explicitly declared with the NULL attribute are assigned the NOT NULL attribute. (Columns of other data types, if not ...
0
votes
1answer
58 views

Database : what design to point on two possibilities?

I am designing a datamodel for a new project. One of the requirements specifies that some objects can point either a person or a company. What is the smartest way to achieve that? I have thought ...
0
votes
1answer
43 views

backup a specific set of tables to be moved to a remote system [duplicate]

I need to generate either backups or data dumps for about 30 tables. I want to generate a file of some sort that contains the data for these tables and transfer them to a different system. Each ...
1
vote
1answer
1k views

DROP LOGIN fails on SQL Server 2014

We have a database with an owner 'dbowner'. Our install procedure drops the login for user 'dbowner' and creates it again. On any other version of SQL Server the following SQL query succeeds: USE ...
1
vote
1answer
81 views

How can I create a database where entries are compressed files searchable by index? [closed]

I am trying to design a database solution for logging where the search indices are dates (days), and the values are zipped files. I am doing this because the sheer number of logs I am processing is ...
1
vote
1answer
260 views

How can I remove references to tables after removing .frm files?

So I had a bunch of csv files in my /var/lib/mysql/imports directory for importing into mysql tables I had created. To clean up the folder I deleted all the files in the directory (incorrectly ...
3
votes
2answers
265 views

Are scripts like sp_BlitzIndex and the others accurate on restored backups?

I am a developer trying to get a better grasp of things. I am wondering if using the scripts from BrentOzar.com will work on restored backups? For example if I have the DBA give a backup of ...
0
votes
4answers
415 views

Aggregate data from two tables with different field names

I have two tables that each have date and amount fields. This is for a donation system so one is pledges and the other is donations. Here are the structure of relevant tables and fields: pledges ...
0
votes
1answer
77 views

How should I store changes to items in the database?

I have items (tracked with itemid) that have attributes assigned to them (field1,field1 for example). At any given time, field1=val1, field2=val1, ..., fieldn=valn where val1,val1,...,valn = 1..100. ...
0
votes
0answers
137 views

Instance consuming large amount of disk space

I have an environment that is Microsoft Server 2000 and Microsoft SQL Server 2000. The database has a file size of 112 GB. The total size of the disk is 122GB. For some reason in less than a few ...
0
votes
1answer
329 views

Is it possible to simplify a query with multiple joins to the same table?

I have a rather large query which takes longer to run than I would like because of 17 LEFT JOINs on the same table. I've done some searching, but haven't found anything that is really similar to my ...
1
vote
1answer
438 views

SQL query to sum a column prior to date and show all entries after that date

I have a database function that sum a column prior to a date and after that date show all entries one by one. that function return the data ordered by a common field and apply the sum by date every ...
0
votes
1answer
34 views

Usage of non standardized queries

So this is more of a theory question than practical but I'd appreciate any help. My friend and I are doing a project to learn new stuff and have fun. He's a coder and I like to think that I'm good ...
0
votes
2answers
1k views

Get distinct count on calculated member?

I'm using SSAS and created a measure group that is linked to Fact_SalesMetrics on SQL Server. In that, I have seven measures. All measures have aggregation of Sum except Sales Invoice which has ...
4
votes
2answers
877 views

Check if contiguous date interval exists

I have a table in PostgreSQL which describes some events that have a start date and an end date: CREATE TABLE my_table ( event_id serial NOT NULL, start_date timestamp without time zone NOT ...

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