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Lucky88 đưa tin: Liverpool thua derby Merseyside, "giương cờ trắng" trước Arsenal, Man City
Posted by lucky on April 26, 2024 at 9:50pm 0 Comments 0 Likes
Xem thêm: https://lucky88.vip/
Sau hai vòng đấu liên tiếp không giành chiến thắng, những tưởng khó khăn đã qua với Liverpool khi đoàn quân của Klopp giành chiến thắng 3-1 trước Fulham vào cuối tuần vừa qua ở vòng 33 Premier League. Tuy nhiên,… Continue
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Why use PostgreSQL?
PostgreSQL comes with many features aimed to help developers build applications, administrators to protect data integrity and build fault-tolerant environments, and help you manage your data no matter how big or small the dataset. In addition to being free and open source, PostgreSQL is highly extensible. For example, you can define your own data types, build out custom functions, even write code from different programming languages without recompiling your database!
PostgreSQL tries to conform with the SQL standard where such conformance does not contradict traditional features or could lead to poor architectural decisions. Many of the features required by the SQL standard are supported, though sometimes with slightly differing syntax or function. Further moves towards conformance can be expected over time. As of the version 13 release in September 2020, PostgreSQL conforms to at least 170 of the 179 mandatory features for SQL:2016 Core conformance. As of this writing, no relational database meets full conformance with this standard.
Below is an inexhaustive list of various features found in PostgreSQL, with more being added in every major release:
Data Types
Primitives: Integer, Numeric, String, Boolean
Structured: Date/Time, Array, Range, UUID
Document: JSON/JSONB, XML, Key-value (Hstore)
Geometry: Point, Line, Circle, Polygon
Customizations: Composite, Custom Types
Data Integrity
UNIQUE, NOT NULL
Primary Keys
Foreign Keys
Exclusion Constraints
Explicit Locks, Advisory Locks
Concurrency, Performance
Indexing: B-tree, Multicolumn, Expressions, Partial
Advanced Indexing: GiST, SP-Gist, KNN Gist, GIN, BRIN, Covering indexes, Bloom filters
Sophisticated query planner / optimizer, index-only scans, multicolumn statistics
Transactions, Nested Transactions (via savepoints)
Multi-Version concurrency Control (MVCC)
Parallelization of read queries and building B-tree indexes
Table partitioning
All transaction isolation levels defined in the SQL standard, including Serializable
Just-in-time (JIT) compilation of expressions
Reliability, Disaster Recovery
Write-ahead Logging (WAL)
Replication: Asynchronous, Synchronous, Logical
Point-in-time-recovery (PITR), active standbys
Tablespaces
Security
Authentication: GSSAPI, SSPI, LDAP, SCRAM-SHA-256, Certificate, and more
Robust access-control system
Column and row-level security
Multi-factor authentication with certificates and an additional method
Extensibility
Stored functions and procedures
Procedural Languages: PL/PGSQL, Perl, Python (and many more)
SQL/JSON path expressions
Foreign data wrappers: connect to other databases or streams with a standard SQL interface
Customizable storage interface for tables
Many extensions that provide additional functionality, including PostGIS
Internationalisation, Text Search
Support for international character sets, e.g. through ICU collations
Case-insensitive and accent-insensitive collations
Full-text search
Views: 43
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