In PostgreSQL, the optimizer uses cardinality estimates to determine the most efficient execution plan for a query. Cardinality refers to the number of rows in a table or the number of rows returned by a […]
MySQL can ignore histograms in the query optimizer when it determines that using the histograms would not provide any benefit to the query execution plan. This can occur in several cases, including: Why MySQL ignores […]
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, […]
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 […]
A reverse key index in PostgreSQL is an index that stores its keys in reverse order. This type of index can help improve query performance when the order of the keys in a table’s primary […]
MySQL 8 performance monitoring helps proactive troubleshooting by providing real-time data and insights into the performance of the database system. By monitoring performance, administrators can proactively identify and resolve potential performance issues before they become […]
To implement a multi-column index in MySQL 8, you need to create an index that includes multiple columns in the index definition. The order of the columns in the index definition is important, as it […]
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