The discipline of Operational and Architectural Management of Database Systems.

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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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vote
1answer
756 views

Remove single quotes from db2 column name

I have following query which i am trying to execute against db2 database server SELECT REPLACE('\'abc\'','\'','') FROM TN_DAY_PROCESS I am expecting the output like abc without single quotes from ...
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1answer
142 views

Does redundancy exists in this table?

I'm studying a DB course and I found this table: In this exercise, the objective is to determine whether the table has redundancy or not. According to the definition of redundancy Data ...
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0answers
85 views

Create replication sql server for DWH [closed]

I have a DWH and I need to make an update once a day from STG Database to DWH I need use replication in SQL SERVER, How I do this?
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1answer
3k views

SQL Server 2012 T-SQL Health Check Script / Stored Proc [closed]

I'm hoping not to re-invent the wheel. I was looking for a routine server side health check script(s) / Stored Proc(s) for SQL Server 2008+ hoping they work on 2012 that provide information in ...
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0answers
3k views

Truncating Table Partitions Containing Data and Global Indexes

I have to truncate a partition (392,000 records) of a table with 20.000.000 records. At the moment, I'm making a truncate table and rebuilding indexes. But the table has 37 indexes and it takes 20 ...
0
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1answer
832 views

How to scatter/arrange all the tables in database model (workbench)?

I have around 71 tables and if i open them for creating a model in workbench all overlap as below If i use the auto layout under arrange section then max i can get is as below How to auto arrange ...
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0answers
60 views

Every 30 minutes mysql stuck for 20-30 seconds [closed]

I have very strong mysql 5.5 computer (Windows server / AWS) . My CPU ~8% ,Disk IO - 0.5% , ~Connection - 800 binlog_format=MIXED, innodb_read_io_threads=64, innodb_write_io_threads=64, ...
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3answers
692 views

MySQL Large DELETE with JOINs

I have a large table players with ~20MM rows which joins to a table stats with ~300MM rows, among others (photos, ...). I want to DELETE all records for players that were born_on before 1950. I ...
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2answers
400 views

Is it possible to know how many times a user connected to an Oracle database?

Is it possible to know how many times a user connected to an Oracle database? If possible where we can find this information?
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3answers
5k views

What are the risks of copying MDF/LDF files without detaching the DB first?

Where DB backups are not available, our support team has been trained to restore using the following steps: Get a copy of the MDF/LDF from a file system backup. Stop the instance. Overwrite the ...
1
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1answer
142 views

Difference between sql agent account logged in as NTLM and UPN?

Can someone please tell the difference between a sql agent account logged in as NTLM and UPN? What is the difference if the sql agent account is logged in as: domain\username and username@domain.com? ...
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2answers
4k views

Optimize a MySQL Database using MySQL Workbench

I actually have a few issues. First, I found this information about optimizing: MySQL OPTIMIZE all tables? The problem is, I don't seem to have a mysqlcheck program anywhere. I'm using MySQL ...
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1answer
374 views

How to make up sqlplus login automatically execute a script for Oracle in Linux? [closed]

Some script is invoked automatically want up sqlplus login, don't know what good method.
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4answers
121 views

T-SQL: Complete Database in one table

at a relational data model every logical relation is a single table with values and so on. I know someone who is this too much work and he wants to create only one table which contains all. This could ...
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2answers
1k views

What's the point in SQL Server Central Management Server?

Online MSDN article "Execute Statements Against Multiple Servers Simultaneously (SQL Server Management Studio)" (SQL Server 2012) states: "Note Before you execute the following procedures, ...
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1answer
483 views

Where to install Oracle client software on SharePoint 2010 Server

We have our ASP.net web application hosted on a SharePoint Server 2010. Our application uses oracle database to save and retrieve data.For our application to work on SharePoint server we need to ...
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4answers
440 views

SQL Server 2005 - 2 sets of backups - 2 maintenance plans?

I did my best to search for an answer to this question and couldn't find a scenario quite like this. I'm a fairly new DBA in the sense that I haven't had a ton of training, I basically took the job ...
5
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1answer
5k views

ERROR: database “dbname” does not exist

According to the documentation, so long as I'm not connected to a database, I can either delete a database in the console using: DROP DATABASE dbname; Or I can drop it using the wrapper tool ...
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2answers
2k views

Update Statement takes forever to complete [closed]

I have table around 1250000 records, and 80 columns Table Structure CREATE TABLE [dbo].[Table] ( [Column1] [int] IDENTITY(1, 1) NOT FOR REPLICATION NOT NULL, [Column2] [int] NULL, [Column3] [int] ...
2
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5answers
3k views

How to determine why a MySQL server has become slow and requests sometimes time out?

I'm working on my first project that makes heavy use of a MySQL database and am struggling to understand performance issues I'm having. Most of the time, responses are returned quickly from the ...
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1answer
47 views

Why Database use Buffer pool for write operation? [closed]

In this case, first we write data in RAM,then same data write in database? Why we need do write operation two time?
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0answers
137 views

Oracle Merge performance

I've a question about the merge performance in oracle. I work in the business intelligence area of a big company and its quite common to have to move millions of records one side to other. The other ...
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2answers
229 views

Triggers After Insert and After Update - Good Practice

It is a good practice to have a separate trigger for After Insert and another one for After Update or there is no problem in having both in the same logic? Also from a perspective of performance it ...
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6answers
1k views

Missing import function in SQL Developer like MS Access has

At my work we used to use MS Access now we are forced to use SQL developer to create queries and export the data. Details: We can only query to the database We cannot create a new database We use ...
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3answers
4k views

Proper MySQL database maintenance

I hope this isn't too broad of a question. I'm certain it'll be able to help me and any future dba noobs that stumble upon it. I'm a systems admin that got put into the roll of DBA (because I helped ...
5
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3answers
669 views

Bad use of Oracle Tablespaces

I have a doubt about the use of oracle tablespaces. I've decided to define for each schema of the datababase two different tablespaces (one for data, and another one for indexes). The problem is that ...
0
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1answer
237 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 ...
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0answers
112 views

how to archive old entries from mysql on rds

I have an AWS RDS MySQL DB. I have ec2 instances and an s3. What I would like to do is only retain 60days old data and archive the rest. I'm still new at this so I'm not really sure what to do. What ...
43
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12answers
5k views

How could DBAs be more 'programmer friendly'?

The answers and comments on the dba.se version and programmers.se version of the question "What are the arguments against or for putting application logic in the database layer?" are very revealing ...
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0answers
46 views

MySQL beginner in troubles

My MySQL knowledge isn't really good. However, I tried to move my websites media folder to an other location and afterwards wanted to update the links in my database: UPDATE wp_posts SET ...
1
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1answer
3k views

How to grant rights for a user in DB2 Express?

I have installed DB2 Express on a PC. My user is not an administrator user, however as far as i know, it is possible to grant a user rights, so he can create/delete/modify a database. I have ...
3
votes
1answer
2k views

Confused about load balancing and horizontal scaling in postgresql [closed]

Please correct me if I am wrong but I guess handling more requests and load by adding more machines or balancing the load between multiple servers is horizontal scalling. So, if I add more servers, ...
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2answers
100 views

How to store a database table in multiple disks with assigned ratio?

I am going to deploy database tables to multiple disks. My database layout would be like following example: There are 3 tables (Customer, Order, Product) and 4 disks (disk_A, B, C, D). Customer: 5% ...
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2answers
11k views

db2 database alias not listed via list database directory but still unable to create that database

I am trying to create a database by logging on to the linux server on which the db2 server is installed, as the instance owner db2 => list database directory System Database Directory Number ...
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1answer
636 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!
0
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1answer
368 views

replication breaks after upgrading master

I have a set up of replication with master 5.1.30 and slave 5.5.16 and the replication is working good Now i have upgraded mysql master to 5.1.47 As far as i know we have to turn off the log bin ...
1
vote
1answer
607 views

ORA-12541 error while connecting to oracle express edition 11g

My oracle express edition was working some months earlier. I dont know what i changed in the system, now I could not connect to it. I tried logging in from sqlplus as sysdba and altered the accounts ...
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2answers
867 views

Move a huge databases from one SQL Server to another

I have customers databases located on my SQL Server 2008 machine. The size of these databases are around 300 GB. I would like to move them all to another SQL Server 2008. Is there a way to shrink ...
0
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1answer
68 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 ...
0
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1answer
536 views

Which MongoDB administration UIs offer a table view (OS X)?

The only admin UI we found that offers a table view is MongoVue, which is only available on Windows. We're on Macs with OS X. Do any exist?
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2answers
3k views

Restore the latest backup on the database

We have a stored proc which takes the backup from a database to the specified location. Sometimes the backup process runs more than once. It causes having more than one backup set on the same file ...
0
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0answers
67 views

SQL Server A network-related or instance-specific error

I have a windows service that performs a lot of hits to database. Sometimes the database connection is down and I got exception "A network-related or instance-specific error". I got this behavior on ...
6
votes
2answers
9k views

SQL Server Connectivity Issues

I am getting the below error on occasion. Maybe every 30mins or so. I am not sure how to track what is causing the issue. I think it could be a Network problem as there are disk backups running as ...
1
vote
2answers
354 views

Automatic Failover in Availability Group

I have 2 nodes in my SQL server fail over cluster. I use SQL Server 2012 Availability Groups for HA purpose. The problem is that when one my server goes down the automatic fail over does not happen! ...
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2answers
482 views

Generic SQL Job Scheduler for multiple RDBMS's?

I have been searching for an answer to this, but can't seem to find anything. So my problem is this - we have an environment with MS SQL Server 2008, MySQL, and RedShift, and have some complex ...
0
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1answer
90 views

Rotate Postgres log at 5GB

How to make postgres 9.1 log to have maximum size 5GB and to be circle when comes to 5GB ? At the moment my log file is over 500GB. /var/lib/postgres/
2
votes
2answers
422 views

Autogrowth, shrink and database performance

I have already asked some questions about Autogrowth and shrink. But I have some doubts related to it. 1)I have a database which grows about 300 MB every month. So is it best to set Autogrowth of 300 ...
1
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1answer
717 views

Autoclose property resets to true after attaching db even if model is set to false

I am using SQL Server Express 2008 R2. The auto close property of a newly created database will be set to value same as model db. In my case I have set autoclose to false for model so that when I ...
2
votes
1answer
188 views

MS Access + SQL Server for 1160 users - Is it worth it? (Please Help!) [closed]

Our school in Delhi (India) wants to develop a professional and robust in-house database (SIS) that should handle vast amount of student information, including admissions, registration, re-enrollment, ...