Found a total of 10000 related content
How do I configure a custom cache directory?
Article Introduction：Setting up a custom cache directory helps manage disk space and optimize system performance, and operations are not complicated. 1. Reasons include freeing system disk space, centrally managing data, and improving performance with faster storage; 2. Linux/macOS can be implemented by setting the XDG_CACHE_HOME environment variable, creating a new directory and modifying the shell configuration file and reloading it; 3. In Windows, you can change the cache path through application settings or command line parameters (such as Chrome's --disk-cache-dir), and some programs also support registry modification; 4. Specific programs such as Steam allow you to specify the cache location by adding library folders, and AndroidStudio, etc. can customize the path in the system settings.
2025-06-27
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858
PostgreSQL WAL (Write-Ahead Log) and Replication with SQL
Article Introduction：WAL is the basis for PostgreSQL to achieve data consistency and high availability. It ensures that logs are logged before data modification, and supports crash recovery and replication. 1.WAL provides transaction persistence, and restores unfinished transactions through replay logs; 2. Master-slave replication depends on WAL log streaming; 3. Logical replication can be configured through SQL commands, such as creating publishing and subscriptions; 4. During configuration, it is necessary to ensure that the table structure is consistent, the permissions are correct, and logicalwal\_level is enabled; 5. Pay attention to replication delays and conflict handling, and it is recommended that the slave library be kept read-only.
2025-07-21
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1022
What is PHP?
Article Introduction：PHP is used for web development because it supports server-side processing, can embed HTML and be compatible with databases. It handles form submissions, user login, and database queries and generates dynamic content directly in HTML. Common uses include building content management systems (such as WordPress), creating e-commerce platforms (such as WooCommerce), processing form data, verifying user input, and managing sessions. To start using PHP, you need to install a local server environment such as XAMPP or MAMP, write code in a text editor, and test the environment by running the "HelloWorld" script.
2025-07-18
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205
Implementing H5 Data Compression for Network Efficiency
Article Introduction：H5 files are worth compressing because it significantly reduces bandwidth and storage usage and has a high compression ratio. The HDF5 format commonly used in scientific computing and data analysis supports chunking and compression functions. The data of numerical arrays is highly redundant. The volume can be reduced to 1/5 of the original after compression using GZIP or LZ4. To enable HDF5 compression, you need to set the chunking size and specify the compression method when creating the data set. For example, Python's h5py library can be implemented through the compression="gzip" parameter. But compression is not omnipotent. Small data sets may increase overhead, and the higher the compression level, the greater the CPU consumption. When transferring compressed HDF5 files, secondary compression should be avoided, and packaging is preferred in uncompressed ways, such as tar, and using HTT
2025-07-18
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264
Memory Performance Boosts with Generators and Nikic/Iter
Article Introduction：PHP iterator and generator: a powerful tool for efficient processing of large data sets
Arrays and iterations are the cornerstone of any application. As we get new tools, the way we use arrays should also improve.
For example, a generator is a new tool. At first we only have arrays, and then we gain the ability to define our own class array structure (called iterators). But since PHP 5.5, we can quickly create class iterator structures called generators.
Generators look like functions, but we can use them as iterators. They provide us with a simple syntax for creating essentially interruptible, repeatable functions. They are amazing!
We will look at several areas where generators can be used and explore the need to note when using generators
2025-02-16
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512
Deep Dive into PHP foreach Performance and Memory Allocation
Article Introduction：When using value traversal, PHP avoids immediate memory copy through the write-on-write (COW) mechanism, and only triggers copying when modifying elements; 2. Use reference traversal (&$item) to save memory and allow modification of the original array, but it needs to be unset($item) after the loop to avoid unexpected overwrite in subsequent loops; 3. Foreach performance is better than for loops (especially when count() is not cached), and is more readable; 4. When processing large data sets, generators (yields) should be used first to maintain constant memory usage; 5. Avoid modifying iterated arrays in traversal to prevent infinite loops or performance problems; 6. Foreach does not change the internal pointer of the array, and should not rely on each(), next(), etc.
2025-08-08
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142
Dave The Diver: How To Catch Spider Crabs
Article Introduction：In Dave The Diver, there are some creatures that are not easy to catch. Or, catch alive that is. The spider crab is one of those very species, making it seem like the only way to bring these crustaceans back up to land is to viciously crack them up w
2025-01-10
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935
Prepare for Interview Like a Pro with Interview Questions CLI
Article Introduction：Prepare for Interview Like a Pro with Interview Questions CLI
What is the Interview Questions CLI?
The Interview Questions CLI is a command-line tool designed for JavaScript learners and developers who want to enhance their interview
2025-01-10
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1556
Soft Deletes in Databases: To Use or Not to Use?
Article Introduction：Soft Deletes: A Question of DesignThe topic of soft deletes, a mechanism that "flags" records as deleted instead of physically removing them, has...
2025-01-10
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1125
Terraria: How To Make A Loom
Article Introduction：There are a lot of crafting stations that you can make in Terraria. This ranges from simple anvils to unique stations meant for one specific type of resource. Early into the game, you'll be able to make your own Loom, which is primarily used to make
2025-01-10
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