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  • Recommended book for Sql Server query optimisation

    - by Patrick Honorez
    Even if I have made a certification exam on Sql Server Design and implementation , I have no clue about how to trace/debug/optimise performance in Sql Sever. Now the database I built is really business critical, and getting big, so it is time for me to dig into optimisation, specially regarding when/where to add indexes. Can you recommend a good book on this subject ? (smaller is better :) Just in case: I am using Sql Server 2008. Thanks

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  • What's wrong with foreign keys?

    - by kronoz
    I remember hearing Joel mention in the podcast that he'd barely ever used a foreign key (if I remember correctly). However, to me they seem pretty vital to avoid duplication and subsequent data integrity problems throughout your database. Do people have some solid reasons as to why (to avoid a discussion in lines with SO principals)? Edit: "I've yet to have a reason to create a foreign key, so this might be my first reason to actually set up one."

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  • How do I update the members of a MySQL SET Type?

    - by MachinationX
    I have a table of values, with one of the columns being of type SET. If it currently has the members ('a', 'b', 'c', 'd'), how do I add 'e' to the possible values? I realize that using a SET type is a little strange, and I'm unclear why one would use it instead of a foreign key to another table with the values of the set, but I didn't design the database in question, and can't change it that much. Thanks for your help!

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  • methods of joining 2 tables without using JOIN or SELECT more than one distinct table in the query

    - by GB_J
    Is there a way of joining results from 2 tables without using JOIN or SELECT from more than one table? The reason being the database im working with requires queries that only contain SELECT, FROM, and WHERE clauses containing only one distinct table. I do, however, need information from other tables for the project i'm working on. More info: the querier returns the query results in a .csv format, is there something we can manipulate there?

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  • Oracle/SQL table attribute question

    - by UnceRawr
    I have been given a context schema for a database i need to make for my coursework but some of the attributes (column names) contain letters in brackets at the end of them such as: *x_Number (Adm) *x_Number (A) *x_Number (P) The problem is i have no idea what these letters mean! Can anyone help?

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  • Q&A: Oracle's Paul Needham on How to Defend Against Insider Attacks

    - by Troy Kitch
    Source: Database Insider Newsletter: The threat from insider attacks continues to grow. In fact, just since January 1, 2014, insider breaches have been reported by a major consumer bank, a major healthcare organization, and a range of state and local agencies, according to the Privacy Rights Clearinghouse.  We asked Paul Needham, Oracle senior director, product management, to shed light on the nature of these pernicious risks—and how organizations can best defend themselves against the threat from insider risks. Q. First, can you please define the term "insider" in this context? A. According to the CERT Insider Threat Center, a malicious insider is a current or former employee, contractor, or business partner who "has or had authorized access to an organization's network, system, or data and intentionally exceeded or misused that access in a manner that negatively affected the confidentiality, integrity, or availability of the organization's information or information systems."  Q. What has changed with regard to insider risks? A. We are actually seeing the risk of privileged insiders growing. In the latest Independent Oracle Users Group Data Security Survey, the number of organizations that had not taken steps to prevent privileged user access to sensitive information had grown from 37 percent to 42 percent. Additionally, 63 percent of respondents say that insider attacks represent a medium-to-high risk—higher than any other category except human error (by an insider, I might add). Q. What are the dangers of this type of risk? A. Insiders tend to have special insight and access into the kinds of data that are especially sensitive. Breaches can result in long-term legal issues and financial penalties. They can also damage an organization's brand in a way that directly impacts its bottom line. Finally, there is the potential loss of intellectual property, which can have serious long-term consequences because of the loss of market advantage.  Q. How can organizations protect themselves against abuse of privileged access? A. Every organization has privileged users and that will always be the case. The questions are how much access should those users have to application data stored in the database, and how can that default access be controlled? Oracle Database Vault (See image) was designed specifically for this purpose and helps protect application data against unauthorized access.  Oracle Database Vault can be used to block default privileged user access from inside the database, as well as increase security controls on the application itself. Attacks can and do come from inside the organization, and they are just as likely to come from outside as attempts to exploit a privileged account.  Using Oracle Database Vault protection, boundaries can be placed around database schemas, objects, and roles, preventing privileged account access from being exploited by hackers and insiders.  A new Oracle Database Vault capability called privilege analysis identifies privileges and roles used at runtime, which can then be audited or revoked by the security administrators to reduce the attack surface and increase the security of applications overall.  For a more comprehensive look at controlling data access and restricting privileged data in Oracle Database, download Needham's new e-book, Securing Oracle Database 12c: A Technical Primer. 

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  • DB Design to store custom fields for a table

    - by Fazal
    Hi All, this question came up based on the responses I got for the question http://stackoverflow.com/questions/2785033/getting-wierd-issue-with-to-number-function-in-oracle As everyone suggested that storing Numeric values in VARCHAR2 columns is not a good practice (which I totally agree with), I am wondering about a basic Design choice our team has made and whether there are better way to design. Problem Statement : We Have many tables where we want to give certain number of custom fields. The number of required custom fields is known, but what kind of attribute is mapped to the column is available to the user E.g. I am putting down a hypothetical scenario below Say you have a laptop which stores 50 attribute values for every laptop record. Each laptop attributes are created by the some admin who creates the laptop. A user created a laptop product lets say lap1 with attributes String, String, numeric, numeric, String Second user created laptop lap2 with attributes String,numeric,String,String,numeric Currently there data in our design gets persisted as following Laptop Table Id Name field1 field2 field3 field4 field5 1 lap1 lappy lappy 12 13 lappy 2 lap2 lappy2 13 lappy2 lapp2 12 This example kind of simulates our requirement and our design Now here if somebody is lookinup records for lap2 table doing a comparison on field2, We need to apply TO_NUMBER. select * from laptop where name='lap2' and TO_NUMBER(field2) < 15 TO_NUMBER fails in some cases when query plan decides to first apply to_number instead of the other filter. QUESTION Is this a valid design? What are the other alternative ways to solve this problem One of our team mates suggested creating tables on the fly for such cases. Is that a good idea How do popular ORM tools give custom fields or flex fields handling? I hope I was able to make sense in the question. Sorry for such a long text.. This causes us to use TO_NUMBER when queryio

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  • "[INS-30131] Initial setup required for the execution of installer validations failed." Encountering this error while installing Oracle database 12c. [on hold]

    - by user132992
    I am trying to install Oracle 12c database on my machine running Fedora 20. And I am encountering this problem: "[INS-30131] Initial setup required for the execution of installer validations failed." And when we see the details then it is like this: Cause - Failed to access the temporary location. Action - Ensure that the current user has required permissions to access the temporary location. Additional Information: - Framework setup check failed on all the nodes - Cause: Cause Of Problem Not Available   - Action: User Action Not Available Summary of the failed nodes fedora - Version of exectask could not be retrieved from node "fedora"   - Cause: Cause Of Problem Not Available   - Action: User Action Not Available To eliminate this error I have tried various measures including the change of permission of the tmp folder and restarting the computer but none is working. Plz someone help me out of this. Any kind of help will be appreciated...

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  • The Connection String Reference Site

    - by Yousef_Jadallah
    In this great site http://www.connectionstrings.com/ you can find about 517 connection strings and 120 providers, drivers and class libraries listed in the database. These for Database Servers as well Data Files. Just you need to choose the needed element then you will get all the information that you calling for.   Hope this helps,

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  • NFS (with Kerberos) mount failing due to "Server not found in Kerberos database" error

    - by Kendall Hopkins
    When running: `sudo mount -t nfs4 -o sec=krb5 sol.domain.com:/ /mnt` I get this error on the client: mount.nfs4: access denied by server while mounting sol.domain.com:/ And on the server syslogs UNKNOWN_SERVER: authtime 0, nfs/[email protected] for nfs/ip-#-#-#-#[email protected], Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/[email protected] for krbtgt/[email protected], Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/[email protected] for krbtgt/[email protected], Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/[email protected] for krbtgt/[email protected], Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/[email protected] for krbtgt/[email protected], Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/[email protected] for nfs/ip-#-#-#-#[email protected], Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/[email protected] for krbtgt/[email protected], Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/[email protected] for krbtgt/[email protected], Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/[email protected] for krbtgt/[email protected], Server not found in Kerberos database UNKNOWN_SERVER: authtime 0, nfs/[email protected] for krbtgt/[email protected], Server not found in Kerberos database Server keytab file: ubuntu@sol:~$ sudo klist -e -k /etc/krb5.keytab Keytab name: WRFILE:/etc/krb5.keytab KVNO Principal ---- -------------------------------------------------------------------------- 7 host/[email protected] (aes256-cts-hmac-sha1-96) 7 host/[email protected] (arcfour-hmac) 7 host/[email protected] (des3-cbc-sha1) 7 host/[email protected] (des-cbc-crc) 9 nfs/[email protected] (aes256-cts-hmac-sha1-96) 9 nfs/[email protected] (arcfour-hmac) 9 nfs/[email protected] (des3-cbc-sha1) 9 nfs/[email protected] (des-cbc-crc) Client keytab file: ubuntu@mercury:~$ sudo klist -e -k /etc/krb5.keytab Keytab name: WRFILE:/etc/krb5.keytab KVNO Principal ---- -------------------------------------------------------------------------- 3 host/[email protected] (aes256-cts-hmac-sha1-96) 3 host/[email protected] (arcfour-hmac) 3 host/[email protected] (des3-cbc-sha1) 3 host/[email protected] (des-cbc-crc) 3 nfs/[email protected] (aes256-cts-hmac-sha1-96) 3 nfs/[email protected] (arcfour-hmac) 3 nfs/[email protected] (des3-cbc-sha1) 3 nfs/[email protected] (des-cbc-crc)

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  • Which are the best tools for Graphic Designing?

    - by Jen
    Hello, I want to take up Graphic Designing as my profession. I would be designing Logos, Icons, Stationery, Brochures, Handouts, Book Covers, etc. But I am thoroughly confused as to which tools are the best and which books/resources will help me learn these tools and graphic designing like a professional. I am ready to shell out money to purchase the resources. Please help me out! Thanks, Jen

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  • Which are the best tools for Graphic Designing?

    - by Jen
    Hello, I want to take up Graphic Designing as my profession. I would be designing Logos, Icons, Stationery, Brochures, Handouts, Book Covers, etc. But I am thoroughly confused as to which tools are the best and which books/resources will help me learn these tools and graphic designing like a professional. I am ready to shell out money to purchase the resources. Please help me out! Thanks, Jen

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  • NGiNX + PHP5-fpm + CDN Tools (plugin)

    - by chris hough
    I am trying to activate the CDN tools plugin and I keep getting the following error: Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 30720 bytes) in /srv/www/www.triathleteskitchen.com/wp-content/plugins/cdn-tools/cdn_classes/cloudfiles/cloudfiles_http.php on line 252 After extensive research on this issue in which I updated both of the following settings: max_execution_time = 300 memory_limit = 128M and verified the settings are active by setting up a dump phpinfo() page. Still no luck /cry I am curious if any php geeks better than me have any ideas or can point me in the right direction. Happy Holidays to you and your families :)

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  • Accessibility tools turn ON on boot screen EVERY TIME

    - by Tristan
    Hello, I wanted to do a joke to my teacher : When she left, she logged out and i set up all the accessibility tools (color blind, narrator.....) When she came back, she turn off her computer by letting the POWER button pushed. Ever since, each time she turns on the computer, all the accessibilty tools came up even if she DISABLES it each time. (@windows 7) Any solution before she kills me or i get fired from the school ? =o Thanks

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  • Database which only holds indexes and last X records in memory?

    - by Xeoncross
    I'm looking for a data store that is very memory efficient while still allowing many object changes per second and disregarding ACID compliance for the last X records. I need this database for a server with not much memory and I can make a key-value store, document, or SQL database work. The idea is that indexes/keys are the only thing I need in memory and all the actual values/objects/rows can be saved on disk do to the low read rate (I just want index/key lookup to be fast). I also don't want records constantly being flushed to disk, so I would like the last X number of records to be held in memory so that 100 or so of them can all be written at once. I don't care if I lose the last 10 seconds worth of objects/values. I do care if the database as a whole is in danger of becoming corrupt. Is there a data-store like this?

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  • WPA2 and the linux wireless tools

    - by Bill Grey
    I would like to know a distribution independent way to connect to WPA2 wireless networks. Do the wireless tools support wpa2? iwconfig and such? Or is it necessary to use wpa_supplicant? Having to edit a config file every time if changing between many networks is quickly frustrating. I am aware of tools like wicd, but would like to know if there is a standard way to do this on all distributions without requiring third party software.

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  • Migrating master-slave MySQL database servers to 2 new servers, any tips or suggestions?

    - by mmattax
    I'm setting up 2 new database servers that will be replacing a current master-slave setup. All boxes are running / will be running MySQL on RHEL. Our current naming conventions: db1 - master database db2 - slave (using MySQL replication) db01 - new master db02 - new slave We need to get db01 to be the new master with db02 as the new slave. What is the best way to migrate db1 and db2 to db01 and db02? db1 and db2 are running in a production setting and we need to minimize all downtime; db1 has roughly 30GB of data in the database. Any suggestions or tips on how to migrate to our new servers would be much appreciated.

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  • Firefox 4 show tools menu in button interface

    - by chris.nullptr
    I like the extra vertical space provided by the latest firefox beta (4b9). However, the button interface doesn't give you access to the tools menu. I know that I can either temporarily enable the menubar by holding down the ALT key, but flipping a flag in about:config would be preferable. Does such a flag exist? Edit: I want to be able to access the tools menu from the new button interface like you can with Bookmarks, History, Options, and Help.

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  • Microsoft Office 2010 Proofing Tools Kit

    - by Svish
    I have installed the Office 2010 available on MSDN, but there is no proofing tools kit available there yet. Still I see various sources where I can download this kit when I search for it on Google. Is the Proofing Tools Kit available yet or not? Are these sources I see on Google legitimate ones or should I stay away from them? Or are they also available from Microsoft directly somewhere I haven't looked yet?

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  • apache log analysis tools for multiple virtual hosts?

    - by shreddd
    I am interested in trying to get a side by side usage comparison of all the virtual hosts being served up by my apache server. In the simplest case, I want to see a list (or bar chart) with each virtual host and the number of requests/traffic on that site. I've been playing around with webalyzer and awstats but I haven't been able to compare multiple virtual hosts in the same infographic. Anyone have any suggestions on tools for doing this (or how I might use the above tools to do so)?

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  • Windows authenticated users have lost access to master (default) database

    - by Rob Nicholson
    Something very strange has occurred on our production SQL database. Users connecting via Windows authentication appear to have lost all access to the master database. By default, all logins have the default database set to master. So when you connect using SQL Server management studio, they get the error: "Cannot open user default database. Login failed error 4064". What's also worrying is that we have a group called "COMPANY - SQL Administrator" which has sysadmin rights and users in this group also get the same error. Worse, they don't appear to be system administrators anymore... If they change their default database to something else, they can connect and then work on the database, it's just the master database that is problematic. I'm not even sure by what mechanism windows authenticated users get access to the master database. Is it something hard coded in or some property that's got changed? Any ideas? Cheers, Rob.

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  • Can I convert my database/script to UTF-8 ?

    - by Mohannad Otaibi
    How can I convert a database to support UTF-8 and convert it's old data from what ever encoding they're in to UTF-8 ? Extra Info: I'm running a server which has many websites on it, and one of them is running WHMCS (php script to manage hosting clients). WHMCS has an iPhone application where i can browse it through iPhone, the problem is that this application will only run if everything in my website is in UTF-8 encoding. I was using windows-1256 as encoding in my script's settings, and i tried changing that in some point of time to UTF-8 for a while then changed it back to windows-1256 so, the data in the database are some inserted using UTF standards and most of them are windows-1256 If someone could clear the picture for me, Do I need to convert every database on the server or just one DB ? what should I change? If i had to do that manually, I'll do it but I need some expert advise.

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