Mutex contention occurs in MySQL when multiple threads attempt to access a shared resource, such as a data structure or a system resource, simultaneously. Because only one thread can access the resource at a time, […]
Cache Buffer Chains (CBC) is a mechanism used by the PostgreSQL storage engine to manage the buffer cache and minimize the amount of disk I/O. The buffer cache is a region of memory that is […]
PgBouncer is a lightweight connection pooler for PostgreSQL. It is used to reduce the overhead of establishing a new connection to a PostgreSQL database for each client request. By pooling connections, PgBouncer can handle a […]
The source code for the PostgreSQL LALR(1) parser is written in C and can be found in the PostgreSQL source code repository. The main components of the parser are: To understand how the parser works, […]
The freelists in PostgreSQL are implemented as a linked list of pages. Each page is a unit of disk space that is managed by the freelist, and its size is determined by the block size […]
The CPU Cache Buffers Chains Latch in PostgreSQL is a synchronization mechanism that protects the buffer cache data structure. The buffer cache is a pool of memory used by PostgreSQL to cache disk blocks that […]
Multiversion Concurrency Control (MVCC) is a mechanism that is used by InnoDB, the default storage engine in MySQL, to provide transactional consistency and support for concurrent access to the same data. In InnoDB, MVCC is […]
A biased join in MySQL 8 can have a significant impact on query performance. A biased join occurs when the query optimizer makes a decision to use a particular index or join type based on […]
In MySQL, histograms are statistical representations of the distribution of data in a table column. They provide information about the distribution of values in a column, which can be used by the query optimizer to […]
Tuning Redo Log Files is important for optimal MySQL performance because the redo log is used to record all changes made to the database. It serves as a critical component in database recovery, ensuring that […]
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