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1. Top results related to what is a blank database access

   • What is a good access time to a database (SQL)?

     Top Answer

     Answered Jan 08, 2011 · 1 votes

     I think it would depend on your needs. Is it for a web server or a desktop application? The amount of data is also important, because reading lots of small records will perform differently than reading a few large records. Access time is also based upon your hardware, software and maybe even some other factors. For example, you can use a database with lightning-fast access, but if your users need to connect to it over a 5 megabit VPN connection, passing through three different proxies and with trafic world-wide, your database would then just be a waste of power. Basically, it's a marketing thing that they're claiming. It's a good product but don't just focus on access time. Make sure you also look at your other needs. Another system might just perform better, even if it has a slower acess time, because it is more optimized in reading it's indices and stuff. So, what do you want, exactly?

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   • What is the difference between a lock and a latch in the context of concurrent access to a database?

     Top Answer

     Answered Feb 26, 2017 · 63 votes

     From CMU 15-721 (Spring 2016), lecture 6 presentation, slides 25 and 26, which cites A Survey of B-Tree Locking Techniques by Goetz Graefe:

     Locks → Protects the index’s logical contents from other txns. → Held for txn duration. → Need to be able to rollback changes.

     Latches → Protects the critical sections of the index’s internal data structure from other threads. → Held for operation duration. → Do not need to be able to rollback changes.

     Other Answers

     Answered Jun 24, 2010 · 14 votes

     It really depends on your DBMS, but here's a good explanation for Oracle.

     http://www.dba-oracle.com/t_lru_latches.htm

     Latches are like locks for RAM memory structures to prevent concurrent access and ensure serial execution of kernel code. The LRU (least recently used) latches are used when seeking, adding, or removing a buffer from the buffer cache, an action that can only be done by one process at a time.

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     Answered May 23, 2017 · 9 votes

     Following is from SQL Server stand point.

     Latches are short-term light weight synchronization objects. Unlike locks, latches do not hold till the entire logical transaction. They hold only on the operation on the page.

     Latches are used by the engine for synchronization of multiple threads (for example trying to insert on a table). Latches are not for developer or application - it is for the engine to do it's task. Latches are internal control mechanism. Whereas locks are for the developer and application to control. Latches are for internal memory consistency. Locks are for logical transactional consistency.

     Waits caused by latches are very important for diagnosing performance issues. Take a look at Diagnosing and Resolving Latch Contention on SQL Server - Whitepaper. The PAGEIOLATCH_EX is an important wait type.

     References

     • SQL Server Latches and their indication of performance issues
     • Knee-Jerk Wait Statistics : PAGELATCH
     • Inside SQL Server: Indexing and Locking

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   • What is the namespace while creating a MS Access database using C#

     Top Answer

     Answered Jul 20, 2013 · 2 votes

     For playing with Microsoft office realated document like MS-Access or MS-Excel you need to add

     using System.Data.OleDb-

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     3/5

   • What is the T-SQL To grant read and write access to tables in a database in SQL Server?

     Top Answer

     Answered Apr 19, 2016 · 127 votes

     In SQL Server 2012, 2014:

     USE mydbGO-ALTER ROLE db_datareader ADD MEMBER MYUSERGOALTER ROLE db_datawriter ADD MEMBER MYUSERGO

     In SQL Server 2008:

     use mydbgo-exec sp_addrolemember db_datareader, MYUSER goexec sp_addrolemember db_datawriter, MYUSER go

     To also assign the ability to execute all Stored Procedures for a Database:

     GRANT EXECUTE TO MYUSER;-

     To assign the ability to execute specific stored procedures:

     GRANT EXECUTE ON dbo.sp_mystoredprocedure TO MYUSER;-

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     4/5

   • Database - What is a good database design for a booking system?

     Top Answer

     Answered Feb 26, 2018 · 1 votes

     I would suggest, first of all, write all the requirements in one table. 1 row is the flat structure of all the requirements. Then start breaking it one by one. That 1 table structure should be having all the required columns. Then follow Normalization concepts of breaking 1 single table into multiple tables.

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2. hevodata.com › learn › how-to-sync-data-from-mongodbMoving Data from MongoDB to PostgreSQL in 2 Easy Methods | Hevo

   hevodata.com › learn › how-to-sync-data-from-mongodb

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   10 hours ago · Step 1: Extract Data from MongoDB using mongoexport Command. Step 2: Create a Product Table in PostgreSQL to Add the Incoming Data. Step 3: Load the Exported CSV from MongoDB to PostgreSQL. Let us try to understand this process to migrate data from Mongo DB to PostgreSQL with the help of an example.

3. www.reddit.com › r › hackingbbcmailing small businesses : r/hacking - Reddit

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   Hello (blank), On Sunday 89rth 1776, (website) was exploited in order to gain access to its database. The website used a faulty database configuration that allowed for SQL injection attacks. (website) database held a 69000 line file containing identifying voter information such as:

4. www.geeksforgeeks.org › what-is-surfing-in-computerWhat is Surfing in Computer? - GeeksforGeeks

   www.geeksforgeeks.org › what-is-surfing-in-computer

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   10 hours ago · Surfing in computing is a term used to describe the activity of browsing or navigating through various web pages and websites on the Internet, in the same way TV viewers would quickly flip from channel to channel searching for programs that interest them most. In computing, software tools exist that allow individual users to access massive ...

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6. justthenews.com › government › federal-agenciesEmails suggest Fauci aides miswrote names to evade FOIA ...

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   1 day ago · NIH could respond that its employees are simply bad at spelling. A social media user pointed Just the News to 11 grants worth tens of millions of dollars in NIH's funding database that identify the recipient as "Janessen," referring to vaccine maker Jannsen, responsible for the since-discontinued Johnson & Johnson COVID vaccine.

7. www.wordplays.com › crossword-answers › puzzlerPuzzler Backwords May 31, 2024 Crossword Answers

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   10 hours ago · For the clue PUZZLE, we are looking for an answer that contains 7 letters. Enter your clue into the clue box and 7 question marks into the letter/pattern box. Click search. The results will be in the highest-ranking order. The stars next to each answer will guide you to the best answer for your clue.

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   10 hours ago · Data as a Service : Dynamic Data and Maps. GIS users can access live data and maps through Interoperable OGC data service such as Web Map Service (WMS/WFS) Data as a raw GIS dataset : Downloadable Data i.e it enables you to perform custom downloads of digital data you are viewing to access locally with GIS Software.

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