0
votes
1answer
55 views

Schema Migration for application upgrades

I have an application which is running with an application schema on Oracle DB. The application needs to be upgraded to new version of Schema on Oracle DB with changes in Schema structure (Table ...
0
votes
2answers
301 views

SQL Server 2008 - How to schedule a copy of view to another database?

I am a Sharepoint admin and need to copy the log data in database to another temp database for analysis. The data is stored in a view ([WSS_Logging].[dbo].[RequestUsage]). There is a column [LogTime] ...
0
votes
1answer
31 views

Require uniqueness with group by

I'm not sure how to couch this question. I have a table that has multiple columns including an id column, a foreign key column 'JobId', and a 'GxpId' column. I have a requirement that a 'JobId' can ...
0
votes
1answer
1k views

mongodb 2.6 mongos start up failed

I'm trying to run mongodb 2.6, everything followed my 2.4 version setup steps. but when I start mongos I got the following problems and just cannot make it. 2014-04-24T03:38:31.001+0800 [mongosMain] ...
0
votes
1answer
186 views

Sql statement to count sum and campare it with another table

I would like to write an sql statement in microsoft access that group items and count their sum in order to compare it to another table I have two table like below : Product: list of demanded ...
0
votes
2answers
36 views

How can I genereate a string from the returns of a SELECT query in Mysql?

I need to create a string from data that is extracted from an SQL query, and wish to accomplish it within the SQL Query. The return is something like +---------------+ | foo_ids | ...
0
votes
1answer
41 views

Mysql tar ball installation

I need to install two different versions of Mysql in one server OS RHEL6 and it will be separated by user called mysqlprod and mysqlpreprod. I need to separate their binaries, softwares,data ...
0
votes
1answer
82 views

monitoring sql execution perfomance of an application that makes use of SP_prepare

we have an application that makes heavy use of sp_prepare and sp_execute and we would like to start monitoring the execution plans of the sql. but this is made difficult by the use of sp_prepare ...
0
votes
2answers
167 views

MySQL: Converting Character set fails?

I'm in the progress of migrating my database from latin1 to utf8 character sets/collations. I wrote a simple script that loops through all of my tables and executes this statement: ALTER TABLE ...
0
votes
1answer
197 views

Data exchange between 2 remote postgresql databases

As per subject I'm looking into a reliable way to synchronize 2 tables that have a same structure between two remote postgresql databases. I was thinking about dblink but an not really sure as in the ...
0
votes
1answer
293 views

sql statement in access that group items and count their sum

I would like to write an sql statement in microsoft access that group items and count their sum My table is like below : id : Auto-Increment Items : String Quantity : Number Eg : id | Items | ...
0
votes
1answer
977 views

What data will be lost with DBCC CHECKDB (REPAIR_ALLOW_DATA_LOSS)?

I have a corrupt database. The last known good backup was over 2 weeks ago. I've run a CHECKDB and have the page numbers where SQL Server located the corruption. I've looked at the data on the ...
0
votes
1answer
41 views

Failover Mirror

My name is Jackson and I'm from Brazil, sorry about my English. My question is about the failover process in SQL Server Mirror. Question: If just the database, not a instance or a server, goes ...
0
votes
1answer
349 views

SQl comand works in Workbench but not from Java Program

I am working on a program that manages a database of client information. I am currently stuck on a problem where the SQL statement created by my java program but get the error SQLException: You ...
0
votes
1answer
67 views

Can't force mysql to use index

There are many similar questions about force index but mine is something different because i successfully use index at local dev server but can't on production server. I have a table with more than ...
0
votes
1answer
37 views

How do I use a temporary table to generate a template of results and then fill it?

So let's say I have a table, call it 'orders' that looks like this: fields: customer|order_type|price data: "Bob" |"Delivery"|100 "Nancy" |"Delivery"|200 Where customer can be any name, ...
0
votes
1answer
111 views

How can I apply heuristics to optimise an expression tree?

I've converted the following SQL query: SELECT name FROM dog d, works_at w WHERE (d.owner_name = w.person_name) AND (w.kennal_name = "Breeders"); into the following expression tree: My main ...
0
votes
1answer
442 views

MySQL query using left join on two inline views not returning rows without values in second view

For some reason when I execute the code below I'm only getting results back that have sku in both views. I thought this should give me everything in the first view and add the content from the second ...
0
votes
1answer
344 views

Randomly failing SQL Server 2008R2 used by Access 2010 front-end via ODBC

From time to time (sometimes days apart, sometimes several times a day) users of a multi-user Access front-end, which has ODBC connections to a SQL Server back-end, see a variety of problems. Most ...
0
votes
1answer
59 views

Is it faster to load several small files, or one big file?

We have a 26GB file that we have to load into an empty table. I was curious, is it faster to load nine 3GB files or one 26GB file? Or is there no difference?
0
votes
1answer
1k views

Unable to Start PostgreSQL. kernel's SHMMAX parameter exceeded you limit

When I am trying to start my PostgreSQL I get the following error in the Postgresql.log file: FATAL: could not create shared memory segment: Invalid argument DETAIL: Failed system call was ...
0
votes
1answer
229 views

MariaDB Galera setup with drastically different amounts of memory used on cluster nodes - why?

We have a 3 node MariaDB Galera cluster. All nodes are identical and the config on each is identical. They have 64GB of RAM each. The output of the following query is 28: SELECT ...
0
votes
1answer
176 views

Postgresql condition on subquery results

This is a new question based on the solution to my previous question I have the following tables: users int (pk) user_id date last_visit int (fk) local_site sites int (pk) site_id site_stats ...
0
votes
1answer
63 views

Is it Ok to have one table with two relations?

I have an event table that has two kinds of participants. Each event will have many participants of each type. Is it good form to have a separate table for each participant type, each related to the ...
0
votes
1answer
180 views

Slow performance of remote restore

Over the weekend, I was participating in a DR test. On the database side, that meant restoring backups from the production system to the DR system. What struck me as odd about the performance of the ...
0
votes
1answer
154 views

Impact of replication compression & encryption on performance, traffic?

What is the impact of MySQL compressed-slave-protocol on replication traffic? According to High performance MySQL it can lower the traffic to a third of the same replication without the compression. ...
0
votes
1answer
457 views

one to zero or one relation strategy

For a 1 - > 0..1 relationship (Let's say a product can have none or 1 product_price) What are the differences between this 2 scenarios. When one should be encoraged over the other or is anyone bad ...
0
votes
1answer
559 views

How to Implement a Retry Feature in SSIS 2012 When a Database Connection Fails?

We have an SSIS 2012 package that supports our internal analytics reporting database by extracting data from an external database server. Last night, for the first time, the package failed due to a ...
0
votes
1answer
45 views

Create a certificate with a private key

Reading this answer I have a question about it: How can I create a certificate with a private key in my app database?
0
votes
1answer
36 views

Is it possible (or good practice) to register data upon Deletion of a record? What would be a better solution?

The problem is the following. A company has one or more representatives (a person who speaks on behalf of the company). When a representative is deleted, it's desired to keep it in an list called ...
0
votes
2answers
176 views

How to optimize query

I'm using SQLite3 and the following query, It seems like there should be a better performing way to write this query; Is there? Select Name, Sum(Case When Used ...
0
votes
1answer
347 views

Moving the IBM Informix IFMXDATA directory to another machine

I'm a total newbie when it comes to Informix DBs, and I'm stuck with what looks like files that contain an Informix database. I'd like to know if it's possible to add or import these files into an ...
0
votes
1answer
249 views

MySQL Server 5.6 only runs when making swapfile

I am new to MySQL server and I have setup a dedicated MySQL server. I am aiming to install MySQL server version 5.6 and since version 5.6 is not available on the Ubuntu repository I have to upgrade it ...
0
votes
1answer
598 views

nesting MAX for SELECT

I have a table, containing TV series episodes: series: | series_id | season | episode | title | 1 | 1 | 18 | xxx | 1 | 2 | 3 | xxy | 3 | ...
0
votes
1answer
42 views

“Reformat” an Oracle instance [closed]

I'd like to "reformat" an Oracle instance. I think as if it had been reinstalled, but maybe faster. Also I want a complete cleanup. Is it possible?
0
votes
2answers
2k views

Query to check if all replication articles are created at Subscriber SQL Server 2012

I am creating an automated build and test tool for our databases. In general there are two stages: - install databases in version A, install transactional replication - drop replication, update ...
0
votes
2answers
152 views

When do I need transactions /locks?

I know that transactions are meant to group several operations as one. But if for example in the same table one transaction does DELETE FROM table where state = 'done' and another does either SELECT ...
0
votes
1answer
128 views

Question on relation schema questions

Assume the following relation schema: S(A,B) T(B,C) Rewrite the following expressions without using join or outer join operators explicitly: S LEFT OUTER JOIN T S FULL OUTER JOIN T How do I do ...
0
votes
1answer
2k views

How to set the Tablix Outer border width weight?

In SSRS 2008 R2, a Tablix has got a property as 'Border Width Weight'. I assumed by assigning a vale to this property (e.g.3 pt) , we can define the outer border's width weight. But it does nothing. ...
0
votes
1answer
148 views

Mongodb crash after multiple query attempts

Every once in a while our mongo service crashes () after displaying log of multiple messages like this: Sun Apr 6 01:11:38.648 [conn2149] getmore prod_db.tweets query: { query: {}, $snapshot: true ...
0
votes
2answers
160 views

How to verify data dumps between two MS SQL and MySQL

I'm trying to verify data exported from MSSQL and imported into MySQL is 100% accurate using MD5 hash. On Linux, I'm using md5sum and WinMD5 on Windows. The encoding is the same: UTF8. I tried both ...
0
votes
2answers
127 views

Which should I use on my DB? - Clustered Index or Non Clustered Index or Both

I just need advice on how I am going to optimize my database. Date ---- Time ---- Area ---- Block ---- Data1 ---- Data2 ---- Data3 ---- DataN I have that format of tables on my database. Each ...
0
votes
1answer
37 views

Insert / Edit Rows by Selecting FK row

When inserting or editing rows ("Edit Top 200 Rows") for a table with a FK constraint, can the editor be configured to select the foreign row, rather than me having to look up the FK?
0
votes
3answers
237 views

Large RAM use after import database - ubuntu server

My new VPS has 4GB of RAM. Before importing database system use about 1.2 GB of RAM. When I import into the database, using 250 MB SQL file, 25000 tables use of RAM goes to 97%, htop showing 3302 mb ...
0
votes
1answer
374 views

Pentaho 4.4 Database connectivity issue

I am getting the following in one of my transformations. I am trying to extract data from SQL server and pushing to mongodb. 2014/04/03 13:11:10 - EMPLOYEE TABLE Input.0 - linenr 700000 2014/04/03 ...
0
votes
1answer
421 views

Slow MySql server - even on a super fast server

I have just upgraded my 12 year old server to a really fast new one. It is a dedicated server, Dell R620 1 x Intel E5-2620 (2.0GHz, 6C) CPU 32GB RAM - 4 x 250GB SSD RAID 1, in short vastly faster in ...
0
votes
1answer
381 views

how to update date field in a record to null?

I have records in a table which a field named as 'validity' contains date as '8/15/1947 12:00:00 AM'. I need to set this date as null. I am having 1000 records,in that validity field is '8/15/1947 ...
0
votes
1answer
104 views

Low-level relational operators from SQL

I have been asked to outline the sequence of commands using low-level operators (join/project/select) that are used in the following SQL statement; SELECT d.name, k.city FROM DOG d, KENNEL k WHERE ...
0
votes
1answer
306 views

How to add a column with computed columns with values of row on Sybase IQ [closed]

How to add a computed column to a table referring a field from current row at Sybase IQ 16 Here is want I want to achieve: When inserting a new row (or updating a row) I want to have a column ...
0
votes
2answers
257 views

MySQL password is changed automatically

I'm the lone user of my computer. I haven't changed my MYSQL root user password, but it is somehow changed to empty password. Help me out ! My default sakila db is also gone. I specified ...

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