Fix MERGE's check for unreachable WHEN clauses (Dean Rasheed) 15.3 版本号 更新要点/bug fixed 链接/注释 15.3 在使用 create schema 中防止命令对 search_path 中的设置进行更改 Prevent CREATE SCHEMA from defeating changes in search_path (Alexander Lakhin) 15.3 修复MERGE 并发更新时的问题 Fix MERGE ...
Repair performance regression in information_schema.triggers view (Tom Lane) 12.3 在pg_dump 中,将事件触发器的恢复推迟到最后 12.4 版本号 更新要点/bug fixed 链接/注释 12.4 在逻辑复制的 walsender 中,修复在发送保持活动消息后无法发送反馈消息的问题 https://www.postgresql.org/docs/release/12.4/ 12.4...
For example, in the figure below, thesale_datecolumn is set as a partition key. By using the partition key in WHERE clause, the partitions to be accessed are narrowed down. Since the search is performed only for the targeted partitions, efficient scan is possible. Pruning partitions Note the...
There are more interesting GiST index examples in the contrib packages for things like textual search, tree structures, and more. Consider multicolumn indexes, when it makes sense When your query filters the data by more than one column, be it with the WHERE clause or JOINs, multicolumn ...
This will result in substantial degradation of performance. So the IN clause works great if the sub-plan selects a fewer number of rows. The catch here is when development happens, there will be fewer rows in tables, and it works differently as the number of rows increases, as the executi...
Should there be two or more columns that are frequently used in the WHERE clause as filters, the multicolumn index would be the best choice.Unique IndexesUnique indexes are used not only for performance, but also for data integrity. A unique index does not allow any duplicate values to be ...
The PostgreSQL JDBC driver even has a connection parameter“autosave” that you can set to “always” to automatically set a savepoint before each statement and rollback in case of failure. As the following will show, this alluring technique will lead to serious performance problems. A performanc...
Learn about different types of locks in PostgreSQL, their purposes, and how they affect database performance with this comprehensive overview.
Improved execution time of queries that use the IN/ANY clause with a B-tree index by optimizing array matches in the B-tree index Improved performance of heavily contended WAL writes (client count of 256 and above) Improvements to logical replication Failover for logical replicationEven if the...
Effective interview questions are a critical piece in the hiring puzzle—and your ticket to top developers. You might ask standard SQL interview questions on topics like JOIN clauses and subqueries or more advanced questions on topics like window functions, CTEs, and recursive queries. The best in...