PostgreSQL

One, the logical operator: The common logical operators are: and, or and not. The semantics are exactly the same as the logical operators in other programming languages. Second, the comparison operator: The following is a list of comparison

PostgreSQL, like most databases, logically divides the attribution of objects through schemas, as shown in the graph. Because of the concept of schema, when accessing objects in a database, we need to specify which schema is underneath.

the process of Yum installation PostgreSQL 9.3.x in CentOS 6.x environment PostgreSQL is a very complex object-relational database management system (ORDBMS), and it is also the most powerful, richest and most complex free software database system

[Abstract] There are many database systems, free software database PostgreSQL is a very complete feature of the Free software object---Relational database management system (ORDBMS), its many features are the predecessor of today's many commercial

Characteristics Mysql PostgreSQL Instance Start the instance by executing the MySQL command (MYSQLD). One instance can manage one or more databases. A single server can run multiple mysqld instances. An instance manager can

In the field of open source database, PostgreSQL is well-deserved for its superior performance, function and good stability, especially for high concurrency support. and superior performance and stability, it is nothing but a good infrastructure,

I. Hosts and topology structure of PG cluster1.host infosCLUSTER01_NODE01 192.168.0.108CLUSTER01_NODE02 192.168.0.109CLUSTER02_NODE03 192.168.0.1102.topology structure sync asyncPrimary (CLS01_NODE01)--

Join nodeThe Join node has the following three types: T_NestLoopState, T_MergeJoinState, T_HashJoinState,The connection type node corresponds to the join operation in the relational algebra, and the following connection types are defined in

1. First knowledge of PostgreSQL large objectA colleague feels very slow when recovering from a file backed up using Pg_dump (using the plain format), so let me analyze what the reason is.I got his. bak file, and the file has 1 more than one G. To

ObjectiveTitle, this blog record in the Linux CentOS 7 installation postgressql The entire process, as well as the database configuration, in the Linux system, PostgreSQL installation methods are divided into two kinds, namely: Binary

ObjectiveThe previous blog records the installation of PostgreSQL 9.3 in the form of RPM packages (Linux CentOS 7 Installation PostgreSQL 9.3 (release)), and this blog will record the installation of PostgreSQL 9.5 in the form of source code

First, download unzip1, download postgresql-9.4.0-1-windows-x64-binaries.zip2, unzip postgresql-9.4.0-1-windows-x64-binaries.zip to E:\Second, add users1. Add Windows user to start PostgreSQL windows serviceNET user Postgres

The Navicat Report Viewer , as a convenient database viewer, allows users to quickly and easily browse reports, regardless of whether the server is available on any Linux, Unix, Mac, or Windows platform. So we are very popular. Here is an

First, installationcentos6.4 Server ip:192.168.220.131WINDOW7 Client ip:192.168.199.218Install PostgreSQL via the following instructions on the CentOS website http://www.postgresql.org/download/linux/redhat/It seems to have been installed, the

1. Installing PostgreSQL$sudo Apt-cache Search PostgreSQL//Find the latest PostgreSQL package$sudo Gem apt-get Install PostgreSQL package name//select Package name for installationInstalling PostGIS$sudo Apt-cache Search PostGIS//Find the latest

3.4 Replay Transaction logOnce we have created an initial base backup of our own, we can collect the Xlog created by the database. When the time comes, we can use all these xlog files and perform the recovery process we expect. This works as

2.4 Adjusting checkpoints and xlogSo far, this chapter has provided insight into how PostgreSQL writes data, in general, what Xlog is used for. Given this knowledge, we can now continue and learn what we can do to make our databases work more

PostgreSQL is similar to Oracle's multi-process framework, so it can support high-concurrency application scenarios. This is similar to Oracle databases, so it is easier to switch Oracle DBA to PostgreSQL databases, after all, PostgreSQL databases

Multi-version concurrency control technology is used by many database or storage engines, such as Oracle, ms SQL Server 2005 +, PostgreSQL, Firebird, InnoDB, Falcon, pbxt, Maria and so on. The new database storage engine uses multi-version instead

 When installing postgreSQL, you may encounter a problem when executing configure The following error is reported: configure: error: readline library not found, but I installed it in the system. Readline package, 1. Environment Information 2.