PostgreSQL provides developers with a rich set of tools to manage concurrent access to data. Internally, data consistency is maintained by using a multi-version model (multi-version concurrency control, MVCC). This means that each SQL statement sees
Psql: Fatal error: User "Postgres" Ident authentication failed1 after installing the PostgreSQL database, you need to initialize and some configuration rails project to connect PostgreSQL.After the PostgreSQL data is installed (the Yum command is
Our company has developed a database product based on Postgres, needless to say we have changed the source code of OSS, and have also integrated and written some plugins. Therefore, when PostgreSQL and related plugins are upgraded, we also need to
Summary of Postgres operations in Ubuntu
1.Basic operation commands
After the installation is complete, PostgreSQL creates a database user account named Postgres by default. It is a super Administrator account like the root account of MySQL
I. INTRODUCTION to psql is a PostgreSQL command line interactive client tool, similar to the command line tool sqlplus: 1 in Oracle allows you to interactively type SQL or commands, then they are sent to the PostgreSQL server, and then the SQL or
Rails connection postgresql error: psql: Fatal error: User "s" Ident authentication failed, psqlpostgresPsql: Fatal error: User "s" Ident authentication failed
1. After the postgresql database is installed, you must initialize and configure some
First, the environment#配置远程连接su postgres vim/var/lib/pgsql/9.4/data/postgresql.conf Edit configuration file listen_address= ' localhost ' before the comment # removed, And the ' localhost ' should be ' * '; vim/etc/postgresql/8.2/main/pg_hba.conf
PG Start first completes the main process and background process start, the start of the completion of the database file opening, the establishment of shared memory and so on. Next, all SQL initiates 1 separate processes to process the SQL execution.
S skills, Postgres skills
If you need to add indexes when the business volume is large, you need to use CONCURRENTLY. Otherwise, your database will easily break down.
create index CONCURRENTLY idx_order_records_bank_statist_uid on
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