The discipline of Operational and Architectural Management of Database Systems.

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MySQL ADD KEY meaning

This code below is creating a primary key on table User, but Im not understanding the second ADD KEY (C_NATIONKEY), do you know what is doing? Its something about foreign keys? ALTER TABLE USER ADD ...
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252 views

ORA-29913 and ORA-30653 error selecting an external table

I created an external table using a .tbl file and now Im trying to select all rows from that table, using: select * from users_load; But Im getting this error: ORA-29913: error in executing ...
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35 views

Possible aproach for MySQL replication

This might be a duplicate questions asked before. But I need to understand a possible approach for my ENV running innodb engine. Is it possible to upgrade a Master MySQL Server to 5.5 to 5.6 and ...
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1answer
28 views

How to get capacity specifications for a particular Oracle release?

How to get capacity specifications for new Oracle release(Oracle 11.2.0.4)? ie, information like How much schema we can create?, How much tables a schema can accommodate? How much rows total ...
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50 views

If my Data, Log and Tempdb drives are on the same LUN, are they using 1 physical drive?

My SQL Server Data, Log and TempDB resides on different logical drives. But when I check the drive properties under Hardware tab, their location are located on the same Port, Bus, Target ID and LUN. ...
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68 views

how to build statistical database?

According to the book I am reading, a statistical database is a database that permits queries that derive aggregated information but not queries that derive individual information. At current time, is ...
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58 views

How to Set up SSRS Web Services to run under another port than 80?

What steps do I have to pace to run Web Service URL and, Report Manager URL, under another port rather than 80? (DBMS is SQL Server 2008R2 and OS is WIn Server 2008R2).
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1answer
162 views

Identifying root cause of high cpu load

I need to research what caused a high load in our Oracle database some days ago. I wish to see a list of of high-load SQL statements. We don't use any Oracle tools like ADDM or AWR. I tried to ...
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2answers
2k views

How to export Oracle database without data

I want export my Oracle database with its structure such as tables, schema, users, tablespaces, datafiles and everything but without the contained data.
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42 views

Feasibility of Automated and Continuous Performance Tuning in the future [closed]

First a quick background: I'm a software developer, not a DBA and have been developing for more than 10 years. Recently I had to optimize a stored procedure and had to run execution plans, create/...
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347 views

Attaching Database Incorrect name in sys.master_files

I have been moving some databases from SQL 2008 to SQL 2012 using detach and attach method. I correctly map up all the files and the physical and logical names appear correctly in the properties of ...
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1answer
38 views

Big Size Database and increasing number of users [closed]

Me and my colleagues are using quite big size normalized database. Basically it's used for warehouse management and daily minimum 100 of the user perform data manipulation operations. 80% of the ...
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1answer
36 views

DB Recommendation While Minimizing Size

I apologize if this question is too specific, if it is, please let me know! I have searched around both on here and the web on selecting the best project-specific engine to fit your needs, and have ...
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2answers
98 views

How can I find table name for each row result?

How can I find the table name for each row result in my query? I have tried ideas suggested on the stack network (overflow, dba) 1 How to make a table name an attribute in PostgreSQL? 2 http://...
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1answer
151 views

Add '%' sign to MySQL results

I am using a query to calculate total percentage but I want a '%' symbol to appear next to it. Any ideas that could help me My query so far is SELECT student.StudentID, student.Name, ROUND ...
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265 views

Sql Server audit could not write to the security log

I am following the training kit for 70-462(Administering Microsoft SQL Server 2012 Databases), and stuck on Auditing SQL Server instances lesson. I have created new user in domain controller, assign ...
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105 views

Server has antivirus. Do I need to enable external locking on MySQL?

From MySQL docs: If you only read tables with other programs, external locking is not required Assuming the bytes of MySQL files does not match viruses, the antivirus will not change the ...
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1answer
188 views

What is the best design for storing courses subscription data?

Building an app that will manage lessons, students, courses. Each lesson belongs to a certain course. A student can subscribe to a single lesson or to a whole course. So it seems straightforward that ...
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1answer
25 views

Is this normal binary logging behaviour - maintaining one ever growing file despite expire_logs_days?

I have a Percona MySQL DB running on a dedicated server. I have in my.cnf # REPLICATION # log_bin=/var/lib/mysql/binlogs/mysql-bin expire_logs_days=7 My issue is that the log file mysql-bin.000001 ...
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183 views

SQL Server 2012 Enterprise: Copy Databases to New SQL Server, Same Domain, Users, Etc

Am having trouble with what seemingly should be an easy process. I'm a SQL Server n00b, so please be gentle and very explanatory with your answers. Currently, I have a SQL Server 2012 cluster (...
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2answers
176 views

Minimizing database size (Many small tables)

Our database is interesting in that we have a large amount of tables that take up a correspondingly large amount of space, but when we do a MySQL dump of said database, it is surprisingly small. ...
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1answer
134 views

How database buffer pool work?

For example we have 2 scenarios: Scenario 1:- We have very small buffer pool size of 100MB. My query data is 500MB. Does the system keep 500MB query data in RAM such that a new ...
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1answer
116 views

Notification when the status on sql server replication is “Not Running”

We have a lot of replications set up. Sometimes for some reason, the status of the replication changes to "Not Running/Expired Soon or Expired". Could you please let me know if there is a way we can ...
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1answer
125 views

Indicators for right balance of the number of DB2 instances per AIX LPAR

I have a question that has been bugging me, but I just don't know how to validate it. We run DB2 LUW on AIX in our shop. Our AIX is currently at 7.1. Our DB2 is at 9.7 FP 4 for most installations and ...
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1answer
972 views

Best Innodb Buffer Pool Size for 8GB RAM?

I found out that my MySQL server is configured with only 128MB for innodb_buffer_pool_size. That is not enough considering that I have a 8GB RAM server. It hosts MySQL server and an Apache/Catalina ...
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1answer
141 views

Copy database from one mysql sever to another mysql server

Following are the details of the database and server: Server1: Host Name: abc Port Num: 01 database: test Server2: Host Name: xyz Port Num 02 database: spareparts userid: spts password: abcdefgh@123 ...
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2answers
238 views

Restore Database with Multiple Restore commands

For automation, I have to dynamically construct the restore commands and thus I have created a script. A .bak file is created on a remote server and I receive it daily. The script builds the restore ...
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2answers
283 views

Cannot find .bak in a backup file [closed]

My database backup works well or you can see the backup in the backup file. But the backup has no format of a backup file. I mean you cannot see the .bak associated with it, therefore unusable by ...
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1answer
2k views

What are the problems with sharing an Access database through online storage service, like Dropbox?

I have a desktop database I created in Access. I'd like to share the database with a single collaborator, who can have full privileges to the database (table access). However, my collaborator is much ...
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2answers
1k views

MySQL: How to fetch nth level child menus of a parent menu

I have a menu which is parent of multiple menu items and each child menu has their own child menus. This pattern is continued till 5-6 vertical hierarchy level. I don't want to write a query which ...
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2answers
3k views

MySQL - HOWTO speed up slave replication on large database / Quickly spawn slave?

We have a large mysql database (about 100GB on disk) that we would like to spawn a slave for. Our typical process for creating a slave is: Create a slave server Load in a mysql dump of the master ...
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1answer
43 views

Max function and group by getting differenet count [closed]

Statement 1 : Select Load_Date , Count(*) Last_Count From <Table_Name> group by Load_Date; Statement 2 : Select max(Load_Date) , Count(*) Last_Count From <TABLE_NAME>; Statement 1 ...
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1answer
2k views

How many tables will be there in Magento 1.8 [closed]

I just started using Magento with 1500 products and I saw the DB size is about 150MB and when I looked at the tables, the count is 250 tables. Is it normal? Should I worry about anything? I host ...
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1answer
158 views

PHP SQLite Admin is running on PHP 5.4

I tried phpsqliteadmin But it doesn't seem to work anymore on PHP 5.4. There are several alternatives, but none of them seems to be "The One" that is maintained and widely used. Is there a standard ...
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1answer
150 views

What is the strategy of query evaluation in DBMS when Limit is used in query?

I have following tables in database post(post_id , user_id , post_text , parsed_text) ; Comment(comment_id , post_id , user_id , comment_text) ; friend(id , user_id , friend_id ) ; group (id , ...
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3answers
322 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 ...
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1answer
495 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 13:...
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1answer
593 views

How should I config the my.ini(or my.cnf) file for mysql?

Thanks for taking your time to look at my question, and I hope that you can help me with this. I have a Windows Server 2012 server, it has: Memory : 3840MB Ram Processor: Intel(R) Xeon(R) CPU E5-...
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2answers
1k views

Recovering mysql innodb table from table.ibd backup file

Just practising DB disaster recovery. As per our back up policy, we do complete disk image back ups every half an hour (on our slave server). Now for a scenario, where some how a table has been ...
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1answer
699 views

how many 'text' column a table could have in mysql? I have this error “Row size too large (> 8126).”

I'm working on a application which is kinda complex to explain how it works. But this is the situation I'm in, ------------------------------------------------------------------------------ FIELD1 (...
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1answer
1k views

What is a bucket in database? [closed]

I was implementing a code that involves a database and buckets. Just wanted to ask what is bucket and can someone describe it with an example? Thanks!
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1answer
69 views

Database Designing Issue

I have a database having Millions of records in three tables. Now i want to split these three tables in multiple tables to reduce redundancy and data duplication. A lot of records(Persons) have ...
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3answers
123 views

Applying data changes from one database to another

I have an application running on Oracle 9i database and I was looking for something more practical to deploy data changes (not schema changes) from the development database to production. Currently I ...
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1answer
423 views

can't connect to postgresql with md5 [closed]

I can connect to db with trust, but it is not letting me to connect with md5. It says : "password authentication failed for user "postgres"" Here what I have in pg_hba.config host all all 192.168....
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1answer
407 views

Which index types do not support online index rebuilds?

In SQL Server 2012 Enterprise Ed., which index types do not support online index rebuilds? and why? and which activity-operations can prevent online index rebuilds?
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2answers
983 views

SQL Server 2012. Update second table based on input from first table

I have two tables in two databases: Table01 in Database01 and Table02 in Database02. Both tables have a column called UserID. The UserID column is created when the user creates a new account on the ...
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1answer
8k views

Oracle 11g increasing shared pool size and java pool size

i need to install/configure oracle jvm on 11g. to be able to install same i need to increase the size of shared_pool_size and java_pool_size. i have automatic memory management enabled. my ...
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1answer
1k views

Oracle Character set identification

In the given export(Normal Export) log file i see following: Export done in WE8ISO8859P1 character set and AL16UTF16 NCHAR character set Is this multi-byte or single byte database char-set. Can you ...
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2answers
14k views

SQL Server Management Studio - connection with SQL Server database engine

This question is in regards with SQL server 2005 and 2012. I have a database server with two instances of SQL Server. Through SQL server management studio I was able to connect to both instances by ...
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1answer
34 views

prepare stmt is not working

set @sqlt = concat("select", @rowname_date," from syslog_data.syslogs_index_1 "); prepare stmt from @sqlt; execute stmt; deallocate prepare stmt; gives me a eeror 1064 in the prepare statement? Any ...