oid index

Previously studied PostgreSQL's notesCREATE TABLE consumption OID create table My_ test_table, He's going to consume a pg_type insert two records _my_ test_table my_test_table oid If the table requires Toast will

The Simple Network Management Protocol (SNMP) is a Protocol used by the Network Management System (NMS) to monitor the status of Network devices. It is a de facto standard for Network Management, if network devices do not support the SNMP protocol,

  Object IdentifierIn relational database tables, the primary key is used to identify records and ensure the uniqueness of each record. In Java, you can determine whether the two objects are equal by comparing whether the memory addresses of the

########### index ###########@see Http://mp.weixin.qq.com/s/4W4iVOZHdMglk0F_Ikao7AClustered Indexes (clustered index): A clustered index determines the physical ordering of data on disk, and a table can have only one clustered index, typically

Background: 1. The relationship between the IP address and the MAC address in the ARP table of the layer-3 device. 2. the forwarding bridge table of the L2 device stores the correspondence between MAC and forwarding ports. 3. CDP (Cisco

Indexed by: Unique index, primary key index, multi-attribute index, partial index, expression index.Index type: b-tree,hash,gist,gin and expression indexPostgreSQL all indexes are "subordinate indexes", that is, the index is physically detached from

ArticleDirectory I. Software Packages I. Software Packages 1. zlib-1.2.5.tar.gz 2. postgresql-9.0beta2.tar.gz Ii. Installation Steps 1. Tar zxvf zlib-1.2.5.tar.gz 2. CD zlib-1.2.5 3../configure-Prefix =/usr/local/zlib make

With its excellent performance, low cost and rich resources, MySQL has become the preferred relational database for most Internet companies. Although excellent performance, but the so-called "good horse with a good saddle", how to better use it, has

1. IndexThe index is the equivalent of a book directory, which helps users quickly find what they need.The database can greatly improve the query efficiency by using a variety of rapid localization techniques. In particular, when the amount of data

The index recommendations are installed with PPAs to help determine which column on which table to index to improve performance under a given load. The index suggestion and the PPAs query planner work together to calculate the execution cost by