PostgreSQL is a relational database management system that helps us store data for different web apps, mobile apps, etc. In Postgres, tables are the objects of a database that depict the data in the form of rows and columns. While working with databases, finding the sizes of the database ...
1.设置NOT NULL约束的字段INSERT必须赋值,没有NOT NULL约束的字段INSERT没有赋值,会自动填充NULL。 /*postgres=# create database test with template = template0 encoding='UTF8' lc_collate='C' lc_ctype='C'; CREATE DATABASE postgres=# postgres=# postgres=# postgres=# \c test You are now connect...
postgres=# create database test with template = template0 encoding='UTF8' lc_collate='C' lc_ctype='C'; CREATE DATABASE postgres=# postgres=# postgres=# postgres=# \c test You are now connected to database "test" as user "postgres". test=# create table tbl_null (a int not null,b...
Check constraints are a powerful tool for ensuring data integrity in PostgreSQL. By defining rules that data must adhere to, you can prevent the insertion or modification of invalid data, helping to maintain the accuracy and consistency of your database. By incorporating them into your d...
Azure Database for PostgreSQL logs provides useful information about database activity, that can help in performance tuning and troubleshooting. While a perfect logging configuration will be a matter of trial and error, what I have explained here is how you can configure log...
this is a kind of method for postgresql database to divide tables and improve query speed. 这是一种对postgresql数据库用于分表的技术,可以提升查询速度,同时更容易管理 Advantage query speed improve before query child table, it will check constraint checks first. decrease query range; ...
Oracle Database PostgreSQL Database H2 / HSQLDB - Embedded Database (see below) Icon Result What this means JIRA is using the embedded database. Due to this, the collation check has not been done. We haven't checked the collation as JIRA is using the embedded (H2/HSQL) database. It ...
Created 'check_postgres_database_size' [postgres@t1yslbin]$ ll total 0 lrwxrwxrwx 1 postgres dba 32 Jul 26 07:21 check_postgres_archive_ready -> /usr/local/bin/check_postgres.pl lrwxrwxrwx 1 postgres dba 32 Jul 26 07:21 check_postgres_autovac_freeze -> /usr/local/bin/check_postgr...
pgcheck - check data file of PostgreSQL database(9.6.6). Usage: pgcheck [-D DATADIR] [-c | -p | -b | -l] {database:[schema.]table[,partition|#index] | filepath} [blocknum] -D - Data directory of database, default use PGDATA environment variable -c - Check Option g - glo...
Created 'check_postgres_database_size' [postgres@t1ysl bin]$ ll total 0 lrwxrwxrwx 1 postgres dba 32 Jul 26 07:21 check_postgres_archive_ready -> /usr/local/bin/check_postgres.pl lrwxrwxrwx 1 postgres dba 32 Jul 26 07:21 check_postgres_autovac_freeze -> /usr/local/bin/check_post...