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4
votes
2answers
2k views

What is the difference between 'two way transactional replication' and 'peer to peer replication'?

Can someone explain in detail the exact differences between 2 way transactional replication and peer to peer replication?
3
votes
1answer
6k views

Storing dictionaries in mongo

Is there any reliable and fast database architecture that allows to store a dictionary(containing up to hundred thousand words) using mongodb?
7
votes
1answer
3k views

Does creating an index on BIT(n) attribute in MySQL make sense?

I am working on a very specific thing and I need to use BIT(n) attributes and efficiently search through them. n is generally not a power of 2. I've seen some mentions on the internet that BIT ...
7
votes
2answers
10k views

Problem with permissions for user

Hi I'm trying to create a login role (user) with a fairly minimal ability to modify the database. They should be able to select, delete, create triggers, insert and update. I would then like to have ...
1
vote
0answers
122 views

How to profile individual queries using PERFORMANCE_SCHEMA

I've been looking at SHOW PROFILES, which seems ideal for what I am doing. However, I've noticed a warning that SHOW PROFILES is being deprecated and that PERFORMANCE_SCHEMA should be used instead. ...
3
votes
1answer
4k views

MySQL query show times in milliseconds, not seconds?

In psql, with \timing on, query times are displayed in milliseconds + hundredths of milliseconds. In MySQL, they are only displayed in seconds + hundredths of seconds. Is there a way to get MySQL to ...
2
votes
0answers
646 views

Linked server issue

I made a linked server between two sql server instances. The remote one I have very little control over. When I try a query I get this: Cannot obtain the schema rowset "DBSCHEMA_TABLES_INFO" for ...
16
votes
1answer
36k views

How to use aes-encryption in PostgreSQL?

I tried aes-encryption by using following statement: SELECT encrypt('test', 'key', 'aes'); which worked, but I am not able to decrypt the value. I inserted it in a field of datatype bytea but I'm ...
0
votes
1answer
242 views

Database column vs row size

I have Column A and Column B in a single table. I need to add 1,000,000 records to this table. I have 2 options: Keep 2 columns and add 1,000,000 records Add more columns and flatten out the data....
1
vote
2answers
225 views

What MySQL storage engine should I choose?

I have a database for my catalog webpage. Some tables are about 3GB with millions of rows. What engine should I choose for my database, InnoDB or MyISAM? There will only be about 1,000 new records ...
6
votes
3answers
3k views

Performance impact of waiting on a service broker message

I have a situation where multiple client apps send messages via the Service Broker (utilizing stored procs). These messages are picked up by yet another client app and then processed. The way the ...
4
votes
2answers
1k views

Do MySQL sub-queries essentially use as much overhead as separate queries?

If I have a query like this: SELECT name FROM ( SELECT * FROM `table` WHERE id IN (1,40,300) ORDER BY AnotherColumn ) From a bandwidth and overhead standpoint, is that the same thing as doing ...
0
votes
1answer
61 views

Searching through lots of applications

Google search has instant search feature. While you are typing, it finds the pages. Apple.com search box. StackExchange ask question part finds similar questions while you are typing question title. ...
3
votes
2answers
3k views

Looking for an efficient way to fix “Could not parse relay log event entry…” error

I have a corrupt relay log in MySQL 5.0 and looking for the steps to fix replication without having to reprocess all the binary logs from the master again. Here is the full error message if you are ...
4
votes
1answer
7k views

Can I use SQLite to share data among different applications?

Can I use SQLite as a database to which 2 or more applications connect? I.e. can I use it to share data among different applications?
0
votes
4answers
34k views

Installing SQL Server 2000 32-bit on Windows Server 2008 x64?

Am I correct in assuming there won't be any issues installing SQL Server 2000 32-bit on a Windows Server 2008 x64 system? I understand the memory limitations, etc, but that doesn't matter at this ...
8
votes
1answer
519 views

Dimension and Fact for same entities?

I'm rather new at DW design and am working on a DW to model some IT infrastructure. The major problem/question at this point is how to model drive information. We will be collecting aggregate data ...
3
votes
1answer
158 views

Necessary to use a checksum on a backup and not solely the 'verify backup' option?

If want to ensure the integrity of a backup, would it be a necessity to use a checksum on all of my backups and not just the 'verify backup' option?
-3
votes
1answer
10k views

What are performance benefits when using number type instead of using char/varchar?

From various posts, I have summarized about using number type instead of char/varchar for PK: If you choose char/varchar type for PK and your values are short (just some alpha numberic codes) then it ...
9
votes
1answer
4k views

Optimal placement of tempdb, mdf and ldf files in SQL Server 2012 on SSD's?

I realize this is probably a very open ended question and the answers could vary, but what is the optimal placement for the tempdb, mdf and ldf files in SQL Server 2012 when talking SSD's? Pre-new-...
32
votes
3answers
208k views

How to select distinct for one column and any in another column?

I need to query an SQL database to find all distinct values of one column and I need an arbitrary value from another column. For example, consider the following table with two columns, key and value: ...
5
votes
4answers
190 views

Replicating only changes made by a specific database user

I am performing parallel testing. We have upgraded the legacy batch jobs to a new framework which we need to test against the existing batch jobs. In the existing setup, I have web application which ...
2
votes
1answer
363 views

DB2 Count problem

We have a query that returns over 20,000 rows on some occasions but times out due to the large amount of data. We have written a COUNT(*) query to throw an error if the record count is more than 20,...
1
vote
1answer
3k views

procedure is not executing

Problem I am getting when I execute this proc: call `sp_frm4_px_prc_calc`(); Error Code : 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version ...
1
vote
2answers
566 views

User-defined sort order for a query

I'm storing user preferences for sort order in a table: $queryHistory = "SELECT orderby,ascdesc FROM user WHERE UserID= ".$id; $resultHistory = doQuery($connection, $queryHistory); $numHistory = ...
42
votes
6answers
270k views

How to import a .sql file in MySQL?

I am trying to import a .sql file using MySQL Workbench and I get this error: ERROR 1046 (3D000) at line 28: No database selected I have first created an empty database called with the same name as ...
4
votes
1answer
1k views

Auditing - parameter values not being written to log

I am using auditing to track usage of some procs in the database. In the log I can see a record for the Procedure being run and, immediately afterwards,the SQL statement that is being run. The ...
1
vote
1answer
397 views

query optimization delete nested query [closed]

Can the following query be optimized ? DELETE FROM COLOR_TAGS WHERE COLOR_PROJECTID = $id AND NoteID IN( SELECT ID FROM note_note WHERE BibID=$bid AND isdel=0);
1
vote
1answer
858 views

Using sys.dm_os_performance_counters and DIFF to display logins per second

PROBLEM Running my script below i can see the number of logins as an accumulated number to my instance: SELECT cntr_value AS [LoginsPerSec] FROM sys.dm_os_performance_counters WHERE ...
10
votes
1answer
5k views

MySQL Partitioning: Is there a performance tradeoff between number of partitions and size of each partition?

I have a large table (several 100 million rows) that I would like to efficiently partition. My question is whether there is a tradeoff between partition size and number of partitions. As far as I ...
6
votes
1answer
2k views

Does dropping a Primary Key constraint from a Partitioned Table break the partition?

We have a table partitioned on a date column. The Primary Key for the table is a composite key of this date column and 4 other columns. We are thinking about dropping the Primary Key constraint from ...
3
votes
1answer
3k views

Stored procedure to check for missing fields in a table

I have a stored procedure that accepts a string parameter, a comma separated list of required column names that the SP should check a particular table and make sure those columns have data in them... ...
27
votes
2answers
38k views

ALTER TABLE CHECK CONSTRAINT

From the Object Explorer in SQL Server, when selecting and scripting a foreign-key constraint, the following code is generated. USE [MyTestDatabase] GO ALTER TABLE [dbo].[T2] WITH ...
3
votes
1answer
507 views

Best embed/reference/field strategy for many inserts (mongo)

I'm building a gaming backend with Mongo, and have some issues on how to best design the schema to maximize performance and database size. My models: User Match -ReferenceMany (User) -...
4
votes
1answer
1k views

Tracking object use using SQL Auditing

I am looking for a solution to track object usage in my database. Objects such as tables, stored procedures, and functions. I discovered SQL Auditing and was under the impression that it's exactly ...
9
votes
1answer
2k views

Column level security

I am in need of a solution to hide specific columns in a table. We have people who need to build reports against this database and specifically some of these tables with confidential information but ...
1
vote
0answers
2k views

v$logmnr_contents with username as unknown

I applied logminer to find who deleted a lot of rows in one table. View v$logmnr_contents give me details of that operation. Unfortunately, minimum supplemental logging was not active when archived ...
5
votes
2answers
17k views

How does one change the default socket used by mysqladmin?

How does one change the default socket used by mysqladmin? I don't see a section for [mysqladmin] in /etc/my.cnf. It tries by default to connect to /tmp/mysql.sock, however, this is not the socket ...
7
votes
4answers
1k views

Can this business logic be enforced by a conditional database constraint?

I am trying to duplicate the business logic embodied an intranet C# web application in the database so that other databases can access it and work under the same rules. This "rule" seems difficult to ...
2
votes
0answers
118 views

MySQL Partioning: Is there a performance tradeoff between number of partitions and size of each partition?

I have a large table (several 100 million rows) that I would like to efficiently partition. My question is whether there is a tradeoff between partition size and number of partitions. As far as I ...
4
votes
1answer
367 views

Aren't two writes required to update a clustered index record

I was reading the article on indexes at simple-talk, where it is written that If a heap has a non-clustered index on it (as the primary key), and data is inserted into the table, two writes have to ...
10
votes
3answers
6k views

How can I ensure that only one copy of a procedure is running in Oracle?

We have the need to ensure that only one copy of a particular procedure is running in Oracle. If it is already running and a user tries to open another, then it should error. Whats the best method ...
1
vote
1answer
934 views

Logminer archived redo logs in other database

Can I move my archived redo logs to other database and apply logminer there to analyze them?
4
votes
1answer
1k views

Why does using a Real data type in a mathematical equation return an incorrect result?

I was trying to figure out the source of what appeared to be a rounding error today, and discovered that one of the columns used in a mathematical equation was using the real data type, and this is ...
4
votes
1answer
24k views

Get two weeks of data but group by a period of 7 days

I am looking to run a query that collects the number of results over the last 14 days, this is fairly easy and achieved like so: SELECT COUNT(id) FROM table_name What I'd like to do is then group ...
2
votes
1answer
7k views

Slave I/O thread dies very often

I have MySQL Replication working between two servers in master-master mode. Replication has been working from day 1. The IO Thread and the SQL Thread has never died. However, the Slave SQL thread ...
6
votes
1answer
2k views

Replicating multiple databases into one database

I would like to replicate multiple databases on different servers into one master database. I have 5 different instances on separate servers all running SQL 2008 R2. The schemas and structure are all ...
5
votes
2answers
101k views

How do I use the IF…ELSE condition in a WHERE clause?

I'm attempting to use the IF...ELSE construct in my WHERE clause to selectively apply conditions to my SELECT. Should this work? CREATE OR REPLACE package body If_Else_Pack IS PROCEDURE Moving ...
-3
votes
1answer
1k views

Why does a VIEW with a CLUSTERED index not use the index?

I have a view that has a clustered index along with other non-clustered indexes. A simple SELECT query does not use any of the indexes even when I select an indexed column. What could be the ...
6
votes
2answers
154 views

Will a SP which writes records fail if accessed by a db_datareader role?

I have a stored procedure which is accessed remotely by an app which is running on some kind of Java/WebSphere type platform. It takes one argument, returns some data and that's that. Recently there ...

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