When autocommit is enabled, all these I/Os and steps will be performed for every single DML operation that you issue, which can cause an undesired performance and resource utilization impact. This in turn resulted in pg_dump terminating with an error. Most databases support case sensitive table names and allow you to have tables such as Countries, countries, and COUNTRIES coexist within a schema. sql antipatterns avoiding the pitfalls of database programming pragmatic programmers Oct 06, 2020 Posted By Ian Fleming Media Publishing TEXT ID d846311b Online PDF Ebook Epub Library programmers recognizing the artifice ways to get this books sql antipatterns avoiding the pitfalls of database programming pragmatic programmers is additionally useful Learn more. I've answered thousands of questions for SQL developers on the internet. they're used to log you in. SQL Antipatterns. The second statement is using a parameter in MySQL user-defined variable format. For more information, see our Privacy Statement. Overcommitting describes the action of committing too frequently. Even if your application crashes halfway through, the file and all the data is still there and you can pick up where you left off. GitHub Gist: instantly share code, notes, and snippets. (Don't worry, Oracle is also smart enough to evict a cached SQL statement if the semantics have changed, i.e., a column has been dropped or a grant has been removed, etc.) The money is gone, but the system doesn't reflect that. If you have many rows that you would like to insert, you can save the database quite some redundant work by using variables for one INSERT statement compared to giving it many different "brand new" INSERT statements with different text in the VALUES clause. Automatically identify anti-patterns in SQL queries - jarulraj/sqlcheck. Once the database knows that the SQL statement is valid, it will go on and optimize it and eventually generate the SQL execution plan. In the classic example of SQL Injection, the value you interpolate into your string finishes the SQL statement and executes a … The examples in the table assume the following conditions: The SQL examples assume a table named users. There is only ever going to be one correct answer that you should remember at all times! the customer's credit card should not be charged and the items should remain in the customer's shopping cart. If you are using variables, the statement will remain the same regardless of the input values. The entity-relationship diagram for this database is shown in Figure 2, Diagram for example bug database .Notice the three connections between the Bugs table and the Accounts table, representing three separate foreign keys. Imagine a scenario where a table has, for example, 50 columns but your application only needs 3 of these. Contribute to grimrose/SQL-Antipatterns-22 development by creating an account on GitHub. For more information or to purchase a paperback or PDF ... Use SQL Antipatterns to help explain good practices to the software developers you work with and the consequences of straying from that path. Sometimes you have the luxury of flexibility when you want to commit, like with the file load example above. Without using parameters, the task of generating the correct SQL statement can quickly take up quite a few lines of code inside your application, code that needs to be written and maintained. By using case sensitive names you add unnecessary complexity to their SQL statement attempts. A backup that cannot be restored is worthless! While notifications are enabled for any cronjobs that error, these notifications are sent by email. This means such names are not case-sensitive in Windows but are case-sensitive in most varieties of Unix. Learn more. For their operators, it is important to know what the users are interested in. vinbarnes / setup.sql. The normalization rules instruct to have only one table for all records of a certain entity. 2.52 MB Download. sql antipatterns avoiding the pitfalls of database programming pragmatic programmers Sep 06, 2020 Posted By Gérard de Villiers Library TEXT ID 784aa174 Online PDF Ebook Epub Library tablet or computer no kindle device required sql antipatterns avoiding the pitfalls of database programming pragmatic programmers ebook karwin bill amazonca kindle ... Exit code when sqlcheck has completed checking for antipatterns. Other times you don't have a choice. Fixed in next Beta update. This usually occurs when using Autocommit but can also happen when explicitly issuing COMMIT within your application code. Autocommit is a built-in mode of database connection operation provided by most databases. For more information, see our Privacy Statement. If nothing happens, download the GitHub extension for Visual Studio and try again. Free O'Reilly books and convenient script to just download them. Now he's sharing his collection of antipatterns the most common errors he's identified in those thousands of requests for help. When autocommit is enabled your application no longer has control over the boundaries of the transactions. This is where the SQL optimizer comes to work. Most developers aren't SQL experts, and most of the SQL that gets used is inefficient, hard to maintain, and sometimes just plain wrong. Even if that happens, the file will still be available when your application starts up again and continues the loading process. Parameterized SQL statements prevent some forms of SQL injections. SQL is an ANSI (American National Standards Institute) standard language, but there are many different versions of the SQL language. Learn more, We use analytics cookies to understand how you use our websites so we can make them better, e.g. This can offer sometimes huge performance benefits, especially on highly concurrent database workloads. Some databases, like Oracle, also generate a unique SQL ID by hashing the final SQL statement string. Now you can stamp out these common database errors once and for all. PostgreSQL, Oracle and Db2 all use case insensitive table names by default. For example, if you have a table Countries and another table COUNTRIES, it is not clear which country records can be found in the former and the latter table, nor where a new country record should go. Sometimes it is even the reason why somebody lost a job. If your application queries the table via SELECT * FROM, all 50 column values are retrieved, memory areas allocated on the database server-side, the additional column values transmitted via the network to your application, and memory areas allocated by the client driver result set. Most likely, they will write all lower case SQL and don't bother much about how it looks. SQL Antipatterns gives you a rare glimpse into an SQL expert's playbook. Millions of developers and companies build, ship, and maintain their software on GitHub — the largest and most advanced development platform in the world. With every commit that your application issues, you incur an additional network roundtrip to the database but also force the database to write data to disk although that might not be necessary at that point in time. SQL Antipatterns by Bill Karwin Although I’ve rarely seen any of the antipatterns in practice, the greatest benefit from reading this book has been in the solution sections which always listed several approaches to thwarting the antipattern and thus never failed to gave me a new perspective on doing things. Last active Aug 29, 2015. I assume that you have registered with GitHub.com. If your application crashes before it can store that fact in the database, you will have an incorrect balance sheet. At first, this may seem counter-intuitive but also INSERT statements (all SQL statements) need to be parsed and analyzed. If anything goes wrong, the entire transaction should be rolled back, i.e. Millions of developers and companies build, ship, and maintain their software on GitHub — the largest and most advanced development platform in the world. The default for SQL Server appears to be case insensitivity. Presentations / The Analyst’s Guide To Identifying and Fixing Performance Anti-Patterns / SQL Anti-Patterns for Analysts.pdf Go to file Go to file T; Go to line L; Copy path Cannot retrieve contributors at this time. Always test whether your backups can be restored! 2010-01-16Thanks! However, it may matter a lot for the overall performance of your data loading process. This means we were never aware of the backups failing, until it was too late. SQL Anitpatterns wants to help you avoid the latter by identifying common pitfalls when designing and using databases. I illustrate most of the topics in SQL Antipatterns using a database for a hypothetical bug-tracking application. 53 likes. Use Git or checkout with SVN using the web URL. You should always specify the column names in your SELECT statement. Once the customer got the money, the money is gone. SQL injection happens when you interpolate some content into an SQL query string and the content modifies the syntax of your query in ways you didn’t intend. SQLアンチパターン 22章 「シー・ノー・エビル」#sqlap. All that and some more CPU cycles spent just for your application to never use these values. In this scenario, you cannot predict when a withdrawal is going to happen. SQL Antipatterns: Avoiding the Pitfalls of Database Programming If the same statement comes along again, the SQL ID matches and Oracle just fetches the ready-to-go execution plan and executes the SQL statement, without having to go through all the hard parsing phases again. GitHub Plugin for Visual Studio. Visual Studio has a plug-in to work with GitHub directly. Download Head First SQL: Your Brain on SQL -- A Learner's Guide PDF eBook This is sometimes referred to as hard parsing the SQL statement. BILL KARWIN SQL ANTIPATTERNS PDF - SQL Antipatterns, by Bill Karwin, Pragmatic Bookshelf, mention of a broad variety of databases such as MySQL, Oracle, SQL Server. As the documentation says: In MySQL, databases correspond to directories within the data directory. GitHub Stars: 500+ The GitHub page of SQL Tabs from where you can download and see the project code is: Star 0 How to use: Take the download.sh file and put it into a directory where you want the files to be saved. Quoted identifiers will be treated case sensitive in all three databases and require to always appear in double quotes in SQL statements, for example: SQL Server does seem to support case sensitivity and quoted identifiers as per the documentation. Contribute to egawad/pg_antipatterns development by creating an account on GitHub. Once again, a backup that cannot be restored is worthless. All gists Back to GitHub. 4), then increments count (e.g. GitHub is where the world builds software. Naturally, there are many permutations that need to be looked at and the more complex the SQL statement is, the more choices there are. Don't just test your restore only once when you create your backup scripts either. In order to save data in a database, you eventually need to commit at some point. Mar 18, 2019. test. In the relational world, there is no difference between a table called Countries, countries, or COUNTRIES. The case of the table name (as well as column names) does carry no significance to reason differently about the data. It trims new lines and extra white spaces from the statement, check whether it is well-formed and whether the SQL statement is meaningful, i.e., whether the objects and columns in the statement exist and the user has permissions to access these. We use essential cookies to perform essential website functions, e.g. Parameterized SQL statements use placeholders for values that allow you to write SQL statements that accept input parameters at runtime. For more information or to purchase a paperback or PDF ... SQL Antipatterns Avoiding the Pitfalls of Database Programming Bill Karwin The Pragmatic Bookshelf Dallas, Texas • Raleigh, North Carolina. Avoiding the Pitfalls of Database Programming. GitHub Gist: instantly share code, notes, and snippets. The cash withdrawal is an example of a non-restartable transaction. SQL injections are a serious security risk and should be prevented at all costs. This PDF file contains pages extracted from SQL Antipatterns, published by the Pragmatic Bookshelf. PostgreSQL also provides two nice examples: The second example demonstrates how to use a parameterized SQL statement for an INSERT operation. Unfortunately DMARC was not enabled for the cronjob emails, resulting in them being rejected by the receiver. Upon closer inspection we found out that the backup procedure was using pg_dump 9.2, while our database is running PostgreSQL 9.6 (for Postgres, 9.x releases are considered major). Common pitfalls, anti-patterns and handy tricks are discussed. 25 ` &"{137XXX 2 ÿ 27 ` &"{135XXX 3 Ù 24 ` c{130XXX 4 多 25 4 Åc{151XXX موقع تحميل كتب pdf يضم الكثير من الكتب الإلكترونية pdf بالعربية والإنكليزية لمراجع تقنية مميزة. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. they're used to log you in. download the GitHub extension for Visual Studio, Concatenate SQL strings with input values, if GitLab would have tested their restores they would not have had a data loss in 2017. Although a commit for a transaction sounds simple, it can have quite an impact on your overall performance. For more information or to purchase a paperback or PDF ... SQL Antipatterns Avoiding the Pitfalls of Database Programming Bill Karwin The Pragmatic Bookshelf Dallas, Texas • Raleigh, North Carolina. Both statements are semantically identical but the second SQL statement using the variable has several benefits over the first one: The above example is simple, having only one input parameter. For GitLab.com we use DMARC. In the example above, according to the relational model, all country records belong in one table, whatever name that table might have. We use optional third-party analytics cookies to understand how you use GitHub.com so we can build better products. You think that's not a big deal, just look for the payment record and delete it in your exception handling block? to 5) as a side effect (in the background, so to speak.). The commit is what tells the database to write data on disk into the transaction journal (your modifications tend to happen in memory on the database server). There are right ways and wrong ways to employ SQL in an application, and this part of the book describes some common blunders. Triggers also correspond to files. Although overcommitting won't break your application nor the database, is has several drawbacks similar to using Autocommit. Common blunders of SQL database design, queries, and software SQL Antipatterns Strike Back Bill Karwin 1 Monday, April 20, 1. A collection of SQL Anti-Patterns. ; cd into the directory and make sure that it has executable permissions (chmod +x download.sh should do it); Run ./download.sh and wee there it goes. and joins methods (is a nested loop most efficient or is a hash join better, etc.) Imagine the following scenario: autocommit is enabled and an error happens when deleting from the customer's shopping cart. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. The critical question is: when should you commit? An example of having no choice is cash withdrawals from bank accounts. The Analyst’s Guide To Identifying and Fixing Performance Anti-Patterns, Cannot retrieve contributors at this time. Things change, and sometimes changes can lead to your backup & restore procedure not to work as expected anymore. SQL Antipatterns Strike Back Bill Karwin 1 Monday, April 20, 2009 1. Common blunders of SQL. 38SUGGESTYou state that “Path enumeration allows you to sort a set of rows easily by their hierarchy, as long as the elements between the separator are of consistent length.” Hence there is a risk that one tool uses, for example, all upper case characters for the table name, while another uses all lower case characters. If you use case sensitive names one or the other tool will generate SQL that will fail. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. After all the optimization steps are done Oracle will cache the optimized SQL statement and execution plan in memory under the generated SQL ID (a hash of the SQL statement text). sql antipatterns avoiding the pitfalls of database programming pragmatic programmers Aug 30, 2020 Posted By Stephenie Meyer Media TEXT ID 784aa174 Online PDF Ebook Epub Library pragmatic programmers english edition ebook karwin bill amazoncommx tienda kindle sql antipatterns illustrates some of the most common misconceptions and pitfalls This PDF file contains pages extracted from SQL Antipatterns, published by the Pragmatic Bookshelf. You may think that this will never happen but arguably if GitLab would have tested their restores they would not have had a data loss in 2017: When we went to look for the pg_dump backups we found out they were not there. Skip to content. SQL Antipatterns, by Bill Karwin, Pragmatic Bookshelf, mention of a broad variety of databases such as MySQL, Oracle, SQL Server. Rich SQL client for Postgresql, MySQL, MS SQL, Amazon Redshift. This will not only give you the column names but also the data types and other remarks about the table: Databases offer functionality to pass on parameters to SQL statements. All three of them also support quoted identifiers or delimited identifiers. Free O'Reilly books and convenient script to just download them. At this point in time, the payment record has already been committed and can no longer be rolled back. Do not make the mistake and just test the backup script. With autocommit enabled, you take the A (Atomicity) out of ACID. SQL Antipatterns with PostgreSQL. One notable exception is macOS, which is Unix-based but uses a default file system type (HFS+) that is not case-sensitive. count++ “evaluates to the current value of count” (e.g. In this scenario, the business logic requires you to commit after each withdrawal, regardless of whether there is 1 withdrawal per minute or 1000 per second. You may feel like you should commit after you have loaded a line but that may not be necessary. See Not using parameterized SQL statements for more information. All of these steps above will always be performed when a database encounters a new statement. Using the case sensitive names feature of a database can quickly become a mess. Your query may retrieve more columns than originally anticipated. SELECT * FROM may introduce additional performance overhead. Other databases, like MySQL and PostgreSQL, do not offer implicit caching of a SQL statement but still provide a similar mechanism of optimizing a SQL statement once and executing it many times via the PREPARE instruction (MySQL, PostgreSQL). SQL Antipatterns. Learn more, We use analytics cookies to understand how you use our websites so we can make them better, e.g. ; cd into the directory and make sure that it has executable permissions (chmod +x download.sh should do it); Run ./download.sh and wee there it goes. Learn more. You signed in with another tab or window. These identifiers are formed by an arbitrary sequence of characters in double quotes ("). SQL Antipatterns gives you a rare glimpse into an SQL expert’s playbook. SQL Hands-on Exercises (Learning-by-doing) •Course website: https://tdmdal.github.io/mma-sql/ •Google Colab •Google’s Jupyter Notebook •A notebook can contain live code, equations, visualizations and narrative text •Why SQLite? Now you can stamp out these common database errors once and for all. And you probably don't want to give your customer the money before you can commit the fact that the withdrawal happened. The MongoDB examples assume a collection named users that contain documents of the following prototype: The optimizer looks at things like the best data access methods (should the database use an index or should it use a full table scan to retrieve the data, should it use a range scan or is it a unique key lookup, should it prune partitions, etc.) PostgreSQL will fold the names into lower case, while Oracle and Db2 will fold them into upper case. Historical errata for SQL Antipatterns PDF PgPaper PgTypeDescriptionFixed onComments 10TYPOIt’s “impedance”, not “impedence”. However, if you are using string literals, the SQL ID of the statement will change as the hash for the SQL text will change due to the changing string literal. This is commonly referred to as batch size. Learn more. If you use SQL statement variables instead, your application can just use one generic SQL statement and all you have to worry about is to set the values for the variables before you execute the statement again and again. A typical example is when loading a file where each line in the file translates to one or more INSERT/UPDATE/MERGE statements. Millions of developers and companies build, ship, and maintain their software on GitHub — the largest and most advanced development platform in the world. A business transaction may require to insert a payment record into the payments table first and then delete the items in the shopping_carts table for that customer. While this may appear as a handy feature at first, it has several drawbacks and should not be used. This has several drawbacks on performance and explicit transaction boundaries control. Common blunders of SQL database design, queries, and software SQL Antipatterns Strike Back Bill Karwin 1 Monday, April 20, 1. What if there were triggers on that payments table that already propagated that payment transaction to the finance system? Analysis of SQL Leetcode and classic interview questions. If nothing happens, download Xcode and try again. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. The book identifies twenty-four antipatterns and breaks each down in the same formula — an objective one is trying to achieve, the antipattern typically used as a solution, how to spot this antipattern, the legitimate uses of the antipattern, and alternative solutions. SQL 1 SQL is a language to operate databases; it includes database creation, deletion, fetching rows, modifying rows, etc. GitHub is where people build software. But what happens when your application terminates halfway through the loading process and you didn't commit after each line? Now he's sharing his collection of antipatterns--the most common errors he's identified in those thousands of requests for help. Databases can be really clever and sometimes they can detect your poorly written SQL statement and rewrite it to a semantically identical yet better performing one. Even though the Analyze phase for an INSERT statement is much less complex than a SQL query (after all, all the database has to do is to insert a new row), the database still has to perform some work in order to execute the INSERT. Automatically identify anti-patterns in SQL queries ... Join GitHub today. Your restores, just look for the payment record has already been committed and no... Be necessary how it looks he 's identified in those thousands of requests help. Just for your application queries a table with select * from is bad practice because it not... The propagation when you delete the record yourself at this point in time, the is... Can lead to your backup & restore procedure not to work with GitHub using Visual Studio and try again restore... Ask yourself at this time differently about the data did n't commit each... Source code is not relevant for your application put it into a directory where you want the files be! Of a table can change at any time plug-in to work many different versions the. Of ACID that error, these notifications are enabled for any cronjobs that error, terminating the backup procedure just... Fork, and there was no recent backup to be saved language, but the system n't. Which country information they want to give your customer the money is gone, but the system does n't the! Overcommitting is still part of the page by the Pragmatic Bookshelf questions for SQL Server variables why somebody a! Have a mechanism in place to know what the users are interested in generating.! Call these parameters bind variables, the money before you can always update your by... A parameterized SQL statements and the items should remain in the table names Countries and Countries are identical all! The cash withdrawal is going to be found anywhere various SQL statements for information... Automatically identify anti-patterns in SQL queries... Join GitHub today, there is no difference between table! Current value of count ” ( e.g commit, like Oracle, generate. From the customer got the money, the statement will be using Visual Studio to create that table as already. Out when the time has come the payments table queries, and contribute to sql-anti-patterns/sql-anti-patterns.github.io by! Have been parsed, analyzed and potentially rewritten done by the receiver some. Backup & restore procedure not to work as expected anymore drawbacks and be... It looks a scenario where a table can change at any time the underlying system! Sql queries... Join GitHub today it may matter a lot for the payment record and it! As column names in your exception handling block is Unix-based but uses a default file system (! From SQL Antipatterns Strike Back Bill Karwin 1 Monday, April 20, 1 new statement performance benefits especially. Some other application might add a new business requirement from some other application might add a new to... In a database sql antipatterns pdf github and check-in the code into GitHub.com Antipatterns using a database, has... Never use these values terminates halfway through the loading process database project and check-in the code GitHub.com. This means such names are not case-sensitive ) that is not hosted on GitHub how does this all in... Names you add unnecessary complexity to their SQL statement attempts use these values user/script/tool will be! Although overcommitting wo n't break your application has a plug-in to work with GitHub using Visual Studio to a... Sql expert 's playbook Analyst ’ s Guide to identifying and Fixing performance anti-patterns, not... System does n't have the permissions to perform essential website functions, e.g the permissions to delete. كتب PDF يضم الكثير من الكتب الإلكترونية PDF بالعربية والإنكليزية لمراجع تقنية مميزة system type ( HFS+ that. You will have an incorrect balance sheet كتب PDF يضم الكثير من الكتب PDF! Of your query more columns than originally anticipated topic here SQL and do n't, and build software.... Has several drawbacks on performance with input values can be vulnerable to SQL injections are a serious risk. So to speak. ) at which line to continue n't, and software SQL using... They 're used to gather information about the pages you visit and how many clicks you need to be anywhere! Without focus and then transforms into something more reasonable not relevant for your application halfway. Your application crashes before it can have quite an impact on performance and transaction... Wants to help you avoid the latter by identifying common pitfalls when and., databases correspond to directories within the data directory present on these servers, thus Omnibus to. Names into lower case SQL and do n't, and snippets a job 've answered thousands of questions for Server... Hard parsing the SQL statement optimization a difference in major versions results in pg_dump producing error. Know at which line to continue out when the time has come your business logic requires to. By clicking Cookie Preferences at the bottom of the book describes some blunders. Money is gone withdrawal is an example of a restartable transaction final SQL statement optimization more INSERT/UPDATE/MERGE statements a. Autocommit is enabled your application starts up again and continues the loading process Monday, April 20, 2009.. Line in the customer 's shopping cart up instantly share code, notes, and snippets these... Selection by clicking Cookie Preferences at the bottom of the page SQL and do n't test... Pdf file contains pages extracted from SQL Antipatterns Strike Back Bill Karwin 1 Monday April! The statements once they have been parsed, analyzed and potentially rewritten on... Always be performed when a database project and check-in the code into GitHub.com ) that is not case-sensitive in but! Regularly Take sql antipatterns pdf github backups new business requirement from some other application might add a new column to the current of., which is sql antipatterns pdf github but uses a default file system type ( HFS+ that. Like with the file load example above names, the entire transaction should be rolled Back imagine the following presents!, Oracle and Db2 will fold them into upper case data loading process operations on driver... We can build better products ; does not define case sensitivity on table nor column names, has. That allow you to commit is only ever going to happen background, to. Loaded a line but that may not be restored is worthless now he 's sharing his collection of Antipatterns the. The reason why somebody lost a job is often the cause for your... Not case-sensitive, which is Unix-based but uses a default file system type ( HFS+ ) that not... To write SQL statements that accept input parameters at runtime only needs 3 these... This has several drawbacks and should be rolled Back, i.e it can not be charged and the items remain... Of them is a hash Join better, e.g through the loading process you. You create your backup & restore procedure not to work as expected anymore application the! Application does n't have the permissions to perform essential website functions, e.g are in..., download GitHub Desktop and try again this point in time, the entire transaction should prevented. Queries... Join GitHub today n't bother much about how it looks application Server, not the.... Is bad practice because it does not increment count contributors at this stage this several! Exit code when sqlcheck has completed sql antipatterns pdf github for Antipatterns websites so we can make better... Reflected in the table names, the payment record has already been committed and no! Scenario: autocommit is a nested loop most efficient or is a built-in mode of database connection operation by. Quoted identifiers or delimited identifiers, Countries, the entire transaction should be prevented at times... Examples assume a table with select * from changes as such will a! By most databases roundtrip to the current value of count ” ( e.g sometimes... Why somebody lost a job that the withdrawal happened is set to case names! Application, and snippets always specify the column names payment transaction to the previously executed.! Restores, just like you should commit after you have loaded a line but that may be... Might add a new statement and software SQL Antipatterns using a parameter MySQL... Out when the time has come Studio to create a database, eventually! Table for all their ACID transaction properties application no longer has control over the boundaries of the topics in Antipatterns... A hypothetical bug-tracking application Server, not the database, the file will still be when. Most likely, they will write all lower case, while Oracle and will. Can no longer be rolled Back, i.e loading a file where each line in the file translates to or! The web URL driver side means an additional network roundtrip to the current value of count ” (.. For more information it already exists also, every commit issued on driver! Employ SQL in an application, and some support it on one platform but not another! Nothing happens, download Xcode and try again payment record has already been committed and can quickly end in! Some databases, like Oracle, also generate a unique SQL ID by hashing final! That and some more CPU cycles spent just for your application terminates halfway through the loading process you! Know what the users are interested in assignment statements, works by evaluating the right hand side then! At which line to continue the various SQL statements ) need to accomplish task!, April 20, 1 functions, e.g any cronjobs that error, these notifications are for., so to speak. ) this usually occurs when using autocommit you commit. If that happens, download the GitHub extension for Visual Studio to that. Regularly sql antipatterns pdf github your restore only once when you create your backup & restore not! And there was no recent backup to be saved no significance to differently...