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6 min readTo connect ScyllaDB from Rust, you can use the scylla.rs client library provided by the ScyllaDB team. This library allows you to interact with the ScyllaDB database from your Rust application. First, you need to add the scylla-rs crate to your Cargo.toml file as a dependency. Then, you can use the library to establish a connection to the ScyllaDB cluster, execute queries, and fetch results.
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6 min readTo submit multiple jobs to a Hadoop cluster, you can use a tool like Apache Oozie. Oozie is a workflow scheduler system that allows users to define workflows that specify the order of execution for a series of Hadoop jobs.To submit multiple jobs to a Hadoop cluster using Oozie, you first need to define your workflow in an XML file. This file will specify the jobs to run, their dependencies, and any other relevant information.
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6 min readIn Rust, dependencies for a macro can be set using the #[macro_use] attribute before importing the crate that contains the macro. This attribute enables the use of macros defined in the specified crate without having to import them explicitly in each module where they are used. By using #[macro_use], the macro can be accessed globally throughout the crate and its dependencies.
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8 min readWhen writing "non-assert" debugging code in Rust, it is important to consider using the debug_assert!() macro instead of assert!() to avoid impacting the performance of the final optimized release build. This macro allows you to define assertions that will only be evaluated in debug builds and will be eliminated by the compiler in release builds.Additionally, you can use the debug_assert_eq.
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6 min readIn Rust, writing to a file from different threads can be done safely using the std::fs::File type wrapped in a Mutex. This allows multiple threads to access the file and write to it concurrently without risking data corruption. The std::sync::Mutex type enforces thread safety by allowing only one thread to access the file at a time.To write to a file from different threads in Rust, you can create a Mutex around the File type and lock it before writing to the file.
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3 min readTo duplicate a rust stream, you will need to create a new stream object that reads from the same source as the original stream. This can be done by using a combination of methods such as clone() or duplicate() depending on the programming language you are using. Once you have duplicated the stream, you can use the new stream object to read and write data independently from the original stream.
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5 min readIn Rust, you can declare a public static pointer using the static keyword. To declare a public static pointer, you first need to define the type of the pointer.
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3 min readIn Rust, a module is a way to organize code within a file or across multiple files. Modules allow you to group related functions, structs, and other items together, making your code more organized and readable. Each Rust file can contain one or more modules, and you can nest modules within other modules to create a hierarchical structure. Modules help to manage the complexity of larger projects by breaking code into smaller, more manageable pieces.
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3 min readTo round up to a specific number in Oracle SQL, you can use the CEIL function. This function allows you to round a number up to the nearest integer or a specified number of decimal places. For example, to round up a number to the nearest whole number, you can use the CEIL function like this: CEIL(number). If you want to round up to a specific decimal place, you can specify the number of decimal places as the second argument in the CEIL function. For example, CEIL(number, decimal_places).
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5 min readIn SQL Oracle, you can compare date parts using various date functions such as EXTRACT, TO_CHAR, and TRUNC.The EXTRACT function allows you to extract a specific date part (day, month, year, etc.) from a date value. For example, you can compare the month of two date values by extracting the month using EXTRACT and then comparing the results.The TO_CHAR function converts a date value to a string in a specified format.
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5 min readTo compare dates in Oracle, you can use the comparison operators such as "=", "<>", "<", ">", "<=", or ">=". When comparing dates, it is important to ensure that the date format is standardized across your query and database. You may need to use the TO_DATE function to convert date strings to date format or use the TRUNC function to ignore the time component of the date.