How to Optimize PostgreSQL Logical Replication 逻辑复制(Logical Replication)或Pglogical是表级别的复制。两者都是基于WAL的复制机制,允许在两个实例之间复制指定表的WAL。这两个看起来让人迷惑,到底有什么区别呢?Logical Replication是PostgreSQL10.0引入的内置新特性,而pglogical则是一个插件。PG10版本之前可以使用该插件...
1 A query on two joined tables 3 Does the MySQL primary key affect the efficiency of a SELECT query? 5 How to optimize multiple ORDER BYs? 3 Postgres 9.6.5 - Can I use a query to calculate a value from two columns and insert the calculated value in a new column in the same table?
How to Optimize PostgreSQL Logical Replication 逻辑复制(Logical Replication)或Pglogical是表级别的复制。两者都是基于WAL的复制机制,允许在两个实例之间复制指定表的WAL。这两个看起来让人迷惑,到底有什么区别呢?Logical Replication是PostgreSQL10.0引入的内置新特性,而pglogical则是一个插件。PG10版本之前可以使用该插件...
Saving a few bytes per tuple in a relation consisting of millions of rows may result in saving some significant storage space. Besides, if we can fit more tuple in a data page, performance can be improved due to lesser I/O activity. References: https://www.postgresql.org/docs/c...
Knowing what happens during these stages can help diagnose why a query won’t run or runs slowly, and can help you optimize queries to run faster. The psql command line utility uses this protocol exclusively to process queries. Query processing ...
postgresql EXPLAIN(VERBOSE,BUFFERS)SELECT*FROMt_testORDERBYembedding <->'[1,2,3]'LIMIT5; Third party sites, likeexplain.depesz.comcan be helpful in understanding query plans. Some questions that you should try to answer are: Was the query parallelized?
Adjust PostgreSQL settings for better performance: Increase Work Memory: Edit postgresql.conf or run: SET work_mem = ‘128MB’; Enable Parallel Query Execution: SET max_parallel_workers_per_gather = 4; Optimize Effective Cache Size: SET effective_cache_size = ‘4GB’; ...
database itself. The PostgreSQL query planner decides whether it’s fixed in RAM or not. Index scans are most likely to be used against higher values; otherwise, sequential scans will be used if the value is low. Recommendations are to setEffective_cache_sizeat 50% of the machine’s total...
Introduction to PostgreSQL PostgreSQLis a powerful, enterprise-class, open-source relational database management system that uses standard SQL to query relational data and JSON to query non-relational data stored in the database. PostgreSQL offers excellent support for all major operating systems. It ...
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