You can use the subqueries to achieve the functionality of the“IF NOT EXISTS”option. So, let’s learn how to create a database that doesn’t exist. PostgreSQL CREATE DATABASE IF NOT EXISTS While creating a database in Postgres, users often encounter an error "Database already exists" th...
问无法恢复Postgresql数据库，出现“数据库已存在”错误ENThis page contains the following errors: error...
postgres=# create database test;CREATEDATABASEpostgres=# alter database testsettablespace mytbs;ALTERDATABASEpostgres=# \c test You are now connected to database"test"asuser"postgres".test=# create tabletb_mytps(i int,namevarchar(32))tablespace mytbs;CREATETABLE 插入实验数据 代码语言:javascript...
postgres | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | | 8745 kB | pg_default | default administrative connection database template0 | postgres | UTF8 | en_US.UTF-8 | en_US.UTF-8 | =c/postgres +| 8537 kB | pg_default | unmodifiable empty database | | | | | postgres...
if [ "${DB_EXISTS}" != "1" ]; then # Create the database createdb -U postgres ${DB_NAME} echo "Database ${DB_NAME} created." else echo "Database ${DB_NAME} already exists." fi Explanation 1. Query Execution: The psql command-line tool queries the system catalog. ...
14/29,0,LOG,00000,"process 49812 still waiting for RowExclusiveLock on relation 61245 of database 13241 after 1000.207 ms","Process holding the lock: 48557. Wait queue: 48877, 46333, 此处省略500+ PIDs, 50816, 50817.",,,"update test set info=info where id=$1;",8,"ProcSleep, proc...
Error updating database. Cause: org.postgresql.util.PSQLException: 错误: 检测到死锁 详细:进程6533等待在事务 36964707上的ShareLock; 由进程10733阻塞. 进程10733等待在事务 36964708上的ShareLock; 由进程6533阻塞. 建议:详细信息请查看服务器日志.
Important:Have you ever encountered a "database databaseName already exists" error while creating a database? No worries! you can fix it by following thelinkedguide. CREATE DATABASE Vs. createdb - What's the Difference? The difference between these commands is that the “createdb” command ca...
Pre-allocate the disks before installation. That will prevent the host from allocating the disk space during database operations. You can change these two parameters in postgresql.conf if you cannot do this: Disable the wal_recycle parameter in postgresql.conf. By default, PostgreSQL recycles t...
postgresql中的数据分布状态描述“统计信息”(Data distribution stats) 对于第二类统计信息,也即用来描述数据分析状态的信息,有两种生成方式 1,后台进程autovacuum lancher会在特定的情况下触发统计信息的更新,这一点类似于SQLServer统计信息的自动更新机制。 2,手动执行analyze table,这一点类似于在SQLServer中手动执行统计...