PostgreSQL

Such as:Steps to resolve:1. SELECT * from pg_stat_activity where datname = ' lnarterydb '//query what sessions the library hasQuery results will have two PID2. SELECT pg_terminate_backend (PID); Break the session, roll back uncommitted thingsFor

CentOS7 PostgreSQL InstallationCentOS7 PostgreSQL Installation Install Installation Installing with YumYum Install HTTP : //yum.postgresql.org/9.4/redhat/rhel-6-x86_64/pgdg-redhat94-9.4-1.noarch.rpmYum Install postgresql94-server

There are no problems in the reading process. Welcome to communicate togetherEmail:[email protected]qq:1494713801One, PostgreSQL time type conversion--The time type is converted into character type select To_char (current_date, ' yyyy/mm/dd ');

1: Configure Hive-site.xml FirstConfiguration> Property> name>Javax.jdo.option.ConnectionURLname> value>Jdbc:postgresql://192.168.56.103:5432/sparksqlvalue> Property> Property>

Practical environmentDatabase: PostgreSQL 9.4; operating system: Windows To create a database that contains an array typeNote that when setting the default value (you can of course not specify a default value), declare the type of the array,

Combined with several articles on the Internet, today finally successfully connected. Below the concrete steps to make a summary, convenient for future search.1, first, install the PostgreSQL 64-bit database, follow the prompts next, and then

This assumes that the PostgreSQL database is already installed.Install the dependent packages first$ sudo yum install python-devel postgresql-develIf using virtualenv, first source a bit under virtualenv. Bin/activate ", and then run$ pip install

Installing the PostgreSQL Package sudo yum install postgresql-server postgresql Initialize DB --D /var/lib/pgsql/data Start/Stop Service systemctl status postgresql.servicesystemctl start postgresql.servicesystemctl

First, installationPostgreSQL version is 9.4.4# git clone-b rel9_4_stable https://github.com/ossc-db/pg_rman.gitInitialized empty git repository in/opt/pg_rman/.git  /remote:counting objects:1939, done.remote:Total 1939 (Delta 0), reused 0 (Delta 0),

After Ubuntu is installed through the Software center, the configuration files are located in the following directoryI created other database users with the superuser, and found that it was not necessary to log in, and it was troublesome to create

About concurrent Indexing: http://58.58.27.50:8079/doc/html/9.3.1_zh/sql-createindex.html Write this blog from a handsome guy. The problem of table lock occurred in indexing. Let's introduce the index syntax for PostgreSQL:version:9.1 CREATE

It is mainly used for PG_DUMP,PSQL data export and import without entering a password, which facilitates the execution of SH script. There are 2 ways, either way.Method One, set the PG environment variableexport PGPASSWORD=‘yourpassword‘Method Two,

For PostgreSQL, the Super User Postgres, which is created by default when the database is installed, is similar to the root user on Linux and has新建数据库用户：CREATE USER新建数据库：CREATE DATABASE删除数据库：DROP DATABASE删除用户：DROP USER撤销权限：REVOKE赋权：GRANTAnd so on

A database contains one or more named schemas, and the schema can contain database objects such as tables. Patterns are a bit like namespaces, and we can use the same names in different namespaces without conflicting. The pattern is not strictly

The operation described here is what we do after we use Psql to enter PostgreSQL's client, they are not SQL statements, but they are often important, and here are some common grooming operations:(1) List all the databases, we use the \l command or

| | string concatenationGrammarstring | | StringExample' Post ' | | ' Gresql '--Return to PostgreSQLlength () stringGrammarLength (String)ExampleLength (' Odoo ')--return 4Like pattern matchingGrammarString like patternExample' abc ' LIKE ' abc

Installation:sudo apt-get install PostgreSQLSet PasswordSudo-u Postgres Psqlpostgres=# ALTER USER postgres with PASSWORD ' postgres ';postgres=# \qsudo passwd-d postgresSudo-u Postgres passwdChange the configuration filesudo

1. Installing the PostgreSQL source# yum Install http://yum.postgresql.org/9.4/redhat/rhel-6-x86_64/pgdg-redhat94-9.4-1.noarch.rpmThere is not much difference in the step of adding the source, mainly the source address has a certain changeExecute

Affected Systems:PostgreSQL PostgreSQL 9.4PostgreSQL PostgreSQL 9.3Describe:Bugtraq id:74790CVE (CAN) id:cve-2015-3166PostgreSQL is an advanced object-relational database management system that supports an extended subset of SQL standards.PostgreSQL

1. Change the table namealter table 表名 rename to 新表名2. Change the field namealter table 表名 rename 字段名 to 新字段名3. Change the field typeFor example: ID field Original type is character varying (50) new type is integerWhere the ID has data for the