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详解C# List＜T＞的Contains、Exists、Any、Where性能对比

简介本文主要讲解C# List的Contains,Exists,Any,Where性能对比问题，通过对比测试实际运行时间来研究它们之间的优劣性。...3、Any方法 Any方法用于判断集合中是否存在满足指定条件的元素，其代码实现如下： public bool Any(Func predicate); 其中，predicate为一个返回...4、Where方法 Where方法用于筛选符合指定条件的元素，其代码实现如下： public IEnumerable Where(Func predicate); 使用方法如下：...，Contains方法性能最好，其次是Exists和Any方法。...本文详细讲解了C# List的Contains,Exists,Any,Where性能对比问题，并给出了示例说明。希望能对读者在实际开发中有所帮助。

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Postgresql逻辑优化学习

1100 width=46) -> Seq Scan on student (cost=0.00..21.00 rows=1100 width=46) Postgresql子连接 postgres...=# explain SELECT * FROM STUDENT WHERE sno > ANY (SELECT sno from STUDENT);...下面的例子中ANY子查是无法提升的，因为里面的cno和外面的ssex没有相关性，所以会产生subplan。...postgres=# explain SELECT * FROM student WHERE ssex ANY (SELECT cno FROM score WHERE student.sno =...sno > ANY (SELECT sno FROM SCORE); QUERY PLAN

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Postgresql源码（32）vacuum freeze起始位点逻辑分析

full vacuum, but keep in mind that only one vacuum process can be * working on a particular table at any...Determine the minimum freeze age to use: as specified by the caller, or * vacuum_freeze_min_age, but in any...multixact freeze age to use: as specified by * caller, or vacuum_multixact_freeze_min_age, but in any...Determine the table freeze age to use: as specified by the caller, * or vacuum_freeze_table_age, but in any...for * multixacts: as specified by the caller, or * vacuum_multixact_freeze_table_age, but in any

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Postgresql分区表大量实例与分区建议（LIST RANGE HASH 多级混合分区）

the best choice will be to partition by the column or set of columns which most commonly appear in WHERE...WHERE clauses that are compatible with the partition bound constraints can be used to prune unneeded...postgres=# explain select * from customers where status = 'EXPIRED1' and arr > 30;...postgres=# explain select * from customers where arr > 30; QUERY...=# explain select * from customers where status = 'EXPIRED1'; QUERY

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Postgresql源码（35）vacuum freeze起始位点逻辑分析

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Prometheus+Grafana PG监控部署以及自定义监控指标

TO postgres_exporter; GRANT CONNECT ON DATABASE postgres TO postgres_exporter; CREATE OR REPLACE FUNCTION...usage: "COUNTER" description: "Number of disk blocks read from this table's TOAST table (if any...usage: "COUNTER" description: "Number of buffer hits in this table's TOAST table (if any...COUNTER" description: "Number of disk blocks read from this table's TOAST table indexes (if any...usage: "COUNTER" description: "Number of buffer hits in this table's TOAST table indexes (if any

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Greenplum查看表的创建时间、修改时间、VACUUM、分析时间，建库时间、修改密码、赋权、资源队列、重命名等DDL时间

as role, actionname as action, subtype as type, statime as time FROM pg_stat_operations WHERE...,d.stausename,d.statime from pg_stat_last_shoperation d left join pg_database b on d.objid=b.oid WHERE...objid oid any OID column 系统目录中对象的OID。 staactionname name 对该对象采取的操作。...objid oid any OID column 对象在其系统目录内的对象OID。 staactionname name 在一个对象上采取的动作。...示例一定要先进入创建表的数据库 postgres=# create table t6(id int,abc text); CREATE TABLE postgres=# select * from

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PostgreSQL 使用递归SQL 找出数据库对象之间的依赖关系 - 例如视图依赖

select * from get_dep_oids('v1'::regclass); get_dep_oids ────────────── {24971} (1 row) 14:41:19 db: postgres...@postgres, pid:54661 =# select * from get_dep_oids('v2'::regclass); get_dep_oids ────────────── {24975...=t2.oid and t1.relkind in ('m','v') ) t where t.ori_oid = any(t.deps) union select * from (...t1.relnamespace=t2.oid and t1.relkind in ('m','v') ) t where t.ori_oid = any(t.deps) ) select a.oid...获取视图的定义 14:41:21 db: postgres@postgres, pid:54661 =# select * from pg_get_viewdef('v1',false);

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每周 Postgres 世界动态 2022w24

网址作者文章Adam JohnsonHow to Find and Stop Running Queries on PostgreSQLMarco Slot(citusdata)Citus 11 for Postgres...goes fully open source, with query from any nodeDavid FetterBeyond the Single PostgreSQL Node, Part...SKIPLaurenz Albe(Cybertec)Case-insensitive pattern matching in PostgreSQLJoshua Drake(CommmandPrompt)Postgres..., where art thou?

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原为PostgreSQL添加插件

where rolname = 'postgres'; oid ----- 10 (1 row) postgres=# select get_current_userid(); get_current_userid...下面来看一下： postgres=# select oid from pg_proc where proname = 'get_current_userid'; oid ------- 24715...(1 row) postgres=# select oid from pg_namespace where nspname = 'brother'; oid ------- 24714...(1 row) postgres=# select oid from pg_extension where extname = 'userid'; oid ------- 24716 (1...row) postgres=# select * from pg_depend where refobjid = 24716; classid | objid | objsubid | refclassid

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在NestJS应用程序中使用 Unleash 实现功能切换的指南

docker-compose up -d --build (run this command where you have dockercompose file) This docker compose...Unleash does not take responsibility for any data leaks or other problems that may arise as a result....://postgres:unleash@db/postgres" Disable SSL for database connections....= '38'; this.response['XL'] = '28'; this.response['XXL'] = '15'; } dataAnalytics = (): any...this.configService.get<string('API_KEY'), }, }); }; @Get('/analytics') dataAnalytics(): any

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Postgresql源码（109）并行框架实例与分析

=# set parallel_tuple_cost = 0; SET postgres=# set max_parallel_workers_per_gather = 4; SET postgres=...can run either in the user backend or in one of the parallel workers without needing to be aware of where...currently-unsolved problem is that some messages may get written to the system log twice, once in the backend where...ensure that, some function we're calling could update the variable after each call, and only the backend where...Similar problems can arise with any more-complex data structure we might choose to use.

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Postgresql源码（104）子连接提升过程pull_up_sublinks

into score values (4, 10, 60); insert into score values (4, 11, 70); case1 SELECT * FROM STUDENT a WHERE...1 3 | stu3 | 1 4 | stu4 | 0 explain SELECT * FROM STUDENT a WHERE a.sno > ANY (SELECT...这样就实现了any的语义，也没有生成subplan，提升了性能。...case2 explain SELECT * FROM student WHERE ssex ANY (SELECT cno FROM score WHERE student.sno = student.sno...elog_node_display(LOG, "parse tree", root->parse, true) 日志中获取 2023-05-29 11:32:51.634 CST,"mingjie","postgres

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Oracle、PostgreSQL、MySQL 数据库安全实践优化

用户权限分层模型层级 Oracle 方案 PostgreSQL 方案 MySQL 方案系统级限制 SYSDBA，仅允许双因素认证访问禁用 postgres 超级用户直接登录限制 root 用户本地登录...审计功能配置能力 Oracle PostgreSQL MySQL 原生审计 AUDIT SELECT ANY TABLE BY ACCESS 扩展插件 pgAudit 企业版插件或 general_log...通用加固步骤禁用默认账户（Oracle 的 SYS、PG 的 postgres、MySQL 的 root 远程访问）启用密码复杂度策略（Oracle Profile、PG 的 passwordcheck...TABLESPACE', 'DROP ANY TABLE'); # PostgreSQL 检查行级安全 SELECT tablename, hasrowsecurity FROM pg_tables...WHERE schemaname = 'public'; # MySQL 检查空密码账户 SELECT user, host FROM mysql.user WHERE authentication_string

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PostgreSQL pg_dump 原理探究与备份数据一致性问题和备份注意事项与 PG MYSQL 到底谁是NO.1

c.reloptions,'check_option=local'),'check_option=cascaded') AS reloptions, CASE WHEN 'check_option=local' = ANY...(c.reloptions) THEN 'LOCAL'::text WHEN 'check_option=cascaded' = ANY (c.reloptions) THEN 'CASCADED':...opcnamespace = 'pg_catalog'::regnamespace AND amname = 'hash') = ANY(partclass) [local] postgres [pg_dump...oid = ANY(pol.polroles)), ', ') END AS polroles, pg_catalog.pg_get_expr(pol.polqual, pol.polrelid) AS...r/postgres} 6100 | subname | {=r/postgres} | {} | i | {=r/postgres}

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Postgresql INDEX HOT 原理与更好的 “玩转” INDEX

首先HOT ，heap only tuples 是Postgres 用户用于减少基于UPDATE 后的大量的IO 所做的工作，主要的问题就是在MVCC 导致的UPDATE 等于INSERT + 废弃行，...o.oid = ALL (indclass) AND att.attnum = ANY(i.indkey) AND a.oid = o.opcmethod AND...postgres=# create tablespace index_storage location '/pgdata/index'; CREATE TABLESPACE postgres=# create...index idx_user_name on user_ini(user_name) tablespace index_storage; CREATE INDEX postgres=# 2 针对当前的索引进行查询和分析...c.relkind = ANY (ARRAY['r', 't']) and c.relname not like 'pg%'; 2 这对当前的索引的大小进行分析 SELECT relname

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How to Build an Effective Initial Deployment Pipeline

Typically, this is where most developers leave their operations....Here’s where it gets interesting. I like to deploy master directly to staging....Wait, isn’t that where we’re deploying production right now?...POSTGRES_DB: test DATABASE_URL: postgres://${POSTGRES_USER}:${POSTGRES_PASSSWORD}@postgres/$...{POSTGRES_DB} RAILS_ENV: test services: - postgres:alpine before_script: - curl -sL https

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实战教程：利用Docker容器化技术部署Szurubooru图像分享平台

:name': moderator 'users:edit:any:pass': moderator 'users:edit:any:email':...moderator 'users:edit:any:avatar': moderator 'users:edit:any:rank': moderator...:any': administrator 'user_tokens:create:self': regular 'user_tokens:edit:any':...Values are Default: #POSTGRES_DB: defaults to same as POSTGRES_USER #POSTGRES_PORT: 5432...:11-alpine restart: unless-stopped environment: POSTGRES_USER: POSTGRES_PASSWORD:

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PostgreSQL Timelines and History File：Master Guide

That’s where recovery_target_timeline comesinto picture....NewTimelineID.historyis created. recovery_target_timeline is a parameterwhich helps us to take our cluster to any...-rw------- 1 postgres postgres 16777216 Nov22 13:05 000000010000000000000004 -rw------- 1 postgres postgres...At the end of recovery the following things will happen End of recovery means the point where thethe...ID of the parent timeline switchpoint XLogRecPtrof the WAL location where

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Postgresql存储结构

where relname='tbl1'; relname | relfilenode ---------+------------- tbl1 | 16384 postgres...postgres=# select relname, relfilenode from pg_class where relname='tbl1'; relname | relfilenode ---...postgres=# select oid,relname, relfilenode from pg_class where relname='pg_class'; oid | relname |...postgres=# select oid,relname, relfilenode from pg_class where relname='pg_database'; oid | relname...foo(i int) TABLESPACE tmpspace; CREATE TABLE postgres=# select oid,datname from pg_database where datname

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详解C# List＜T＞的Contains、Exists、Any、Where性能对比

Postgresql逻辑优化学习

Postgresql源码（32）vacuum freeze起始位点逻辑分析

Postgresql分区表大量实例与分区建议（LIST RANGE HASH 多级混合分区）

Postgresql源码（35）vacuum freeze起始位点逻辑分析

Prometheus+Grafana PG监控部署以及自定义监控指标

Greenplum查看表的创建时间、修改时间、VACUUM、分析时间，建库时间、修改密码、赋权、资源队列、重命名等DDL时间

PostgreSQL 使用递归SQL 找出数据库对象之间的依赖关系 - 例如视图依赖

每周 Postgres 世界动态 2022w24

原为PostgreSQL添加插件

在NestJS应用程序中使用 Unleash 实现功能切换的指南

Postgresql源码（109）并行框架实例与分析

Postgresql源码（104）子连接提升过程pull_up_sublinks

Oracle、PostgreSQL、MySQL 数据库安全实践优化

PostgreSQL pg_dump 原理探究与备份数据一致性问题和备份注意事项与 PG MYSQL 到底谁是NO.1

Postgresql INDEX HOT 原理与更好的 “玩转” INDEX

How to Build an Effective Initial Deployment Pipeline

实战教程：利用Docker容器化技术部署Szurubooru图像分享平台

PostgreSQL Timelines and History File：Master Guide

Postgresql存储结构

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