postgresql SQL 的相关内容

文章 2020-02-25 来自：开发者社区

PostgreSQL 通过SQL接口关闭、重启数据库

标签 PostgreSQL , 重启 , 信号 , postmaster.pid , pg_reload_conf() 背景如何通过SQL接口直接关闭数据库，或者重启数据库？关闭和重启数据库是一个风险较大的操作，如果能通过SQL来关闭，重启数据库，当然是很难想象的，因为SQL通常是使用接口...

文章 2020-02-25 来自：开发者社区

xDB Replication Server - PostgreSQL, Oracle, SQL Server, PPAS 全量、增量(redo log based, or trigger based)同步（支持single-master, mult-master同步, 支持DDL）

标签 PostgreSQL , xDB replication server , sql server , oracle , ppas , 同步 , ddl , dml , 全量 , 增量 , log based , trigger based , smr(single-master replication) , mmr(multi-master replication) 背景 Pos...

文章 2019-08-12 来自：开发者社区

"PostgreSQL 12: 新增 log_statement_sample_rate 参数控制数据库日志中慢SQL百分比"

PostgreSQL 提供的 log_min_duration_statement 参数设置后，数据库中执行时间超出设置值的SQL将记录到数据库中，此参数对所有库所有SQL都有效。维护PostgreSQL生产库时，数据库日志出现高频慢SQL实属正常，若其中一条比较繁忙的SQL若执行时间超过 log_min_duration_statement 设置值，那么数据库日志中将存在大量此条SQL的日志，....

文章 2019-07-18 来自：开发者社区

一款在线ER模型设计工具，支持MySQL、SQLServer、Oracle、Postgresql sql导入

给大家介绍一款在线ER模型生成的工具，可以针对多种数据库的DDL文件在线生成ER模型图表，支持MySQL、SQLServer、Oracle、PostgreSQL等数据库。主要功能如下：支持表的创建，同时可以根据数据库的类型不同编辑表结构、字段类型、主键、默认值、索引、备注信息等等支持视图，触发器，sequence，存储过程，函数的查看及编辑同步生成SQL供用户操作访问地址：数据库E...

文章 2019-04-27 来自：开发者社区

PostgreSQL datediff 日期间隔（单位转换）兼容SQL用法

标签 PostgreSQL , datediff 背景使用datediff，对时间或日期相减，得到的间隔，转换为目标单位(日、月、季度、年、小时、秒。。。等)的数值。 DATEDIFF ( datepart, {date|timestamp}, {date|timestamp} ) 周 select datediff(week,'2009-01-01','2009-12-31') a...

文章 2019-04-14 来自：开发者社区

PostgreSQL dblink异步调用实践,跑并行多任务 - 例如开N个并行后台任务创建索引, 开N个后台任务跑若干SQL

标签 PostgreSQL , 后台任务 , DBLINK 异步调用背景使用DBLINK异步接口，可以非常方便的实现跑后台任务，如果要让数据库执行若干条SQL，开N个并行执行，同样可以使用DBLINK封装成API进行调用。例如，结合我前面的一些文字，可以实现自动选择索引接口、指定并行度、指定表空间、给所有字段创建索引。《自动选择正确索引访问接口(btree,hash,gin,gist...

文章 2019-04-14 来自：开发者社区

PostgreSQL 与 MS SQL(SQL Server) 类型映射关系

标签 PostgreSQL , ms sql , SQL Server , 类型映射背景 PostgreSQL与SQL Server的类型映射： 1、常用类型映射 https://www.codeproject.com/tips/1068276/convert-sql-server-database-to-postgresql char char / text...

文章 2019-01-09 来自：开发者社区

PostgreSQL 11 新特性解读 : psql 新增变量记录SQL语句的执行情况和错误

PostgreSQL 11 版本新增加 ERROR、SQLSTATE、ROW_COUNT、LAST_ERROR_MESSAGE、LAST_ERROR_SQLSTATE 五个变量用来记录SQL语句的执行结果状态和错误信息。这些变量的值随着SQL执行后进行刷新，主要用来编写脚本时捕获SQL的执行结果。 Release 说明 Add psql variables to report query ac....

问答 2018-11-29 来自：开发者社区

云数据库RDS PostgreSQL 10 能开启SQL审计功能吗

想购买具备SQL审计功能的云数据库-PostgreSQL版，目前公司用的数据库为自建PostgreSQL9.6版本

文章 2018-10-23 来自：开发者社区

PostgreSQL sql文件编码引起的数据导入乱码或查询字符集异常报错(invalid byte sequence)

背景当用户客户端字符集与服务端字符集不匹配时，写入的多字节字符（例如中文）可能出现乱码。例子数据库字符集为sql_ascii，允许存储任意编码字符。 digoal@pg11-320tb-zfs-> psql psql (11beta4) Type "help" for help. postgres=# l+ ...

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