Database Administrator

Use Hive's regular parser RegexSerDe to analyze Nginx logs 1. Environment: Hadoop-2.6.0 & apache-hive-1.2.0-bin 2. Use Hive to analyze nginx logs. The website access logs are as follows: Cat/home/hadoop/hivetestdata/nginx.txt192.168.1.128--[09/Jan/20

Use of the Log4jdbc database access logging framework Log4jdbc official website address Http://code.google.com/p/log4jdbc/ Https://github.com/arthurblake/log4jdbc The latest version is 1.2. JDBC3 and JDBC4 are supported. Log4jdbc is a log

PostgreSQL vacuum Principle 1 Functions and Parameters From the previous article "PostgreSQL MVCC source code implementation []", we know that PG does not store the old version of undo like Oracle, but directly stores the old version in the relation

Oracle RMAN-06023 and ORA-19693 errors When restoring a 0-level backup database to another machine, first encountered a RMAN-06023 and then encountered a ORA-19693 error, the error occurred in the environment and content is roughly as

MySQL innodb_table_stats table does not exist MySQL version 5.6.14 The company's error logs for several MySQL servers show that several system tables do not

PostgreSQL physical file ing We know that in PG, each relation, that is, the table, has several fork mappings. "MAIN" fork is used to store the data in the master table, "FSM" fork is used to manage the free space, and "visibility" fork is used to

MySQL -- install MySQL5.5 and centosmysql5.5 in RPM Mode Under CentOS Reprinted please indicate the source: http://blog.csdn.net/l1028386804/article/details/46507735First go to the mySQL official website to download the

Mongo java and/or multi-condition query, using java// And, or multi-condition joint Query// Age condition (and condition)BasicDBList condList = new BasicDBList ();BasicDBObject cond = new BasicDBObject ();Cond. put ("$ gt", 0 );Cond. put ("$ lte", 40

Install navicat and centosnavicat on centos 7:Http://download.navicat.com/download/navicat111_mysql_en.tar.gzCopy the downloaded file to the specified installation directory.[Hcr @ localhost Downloads] $ cp

One-click excel export and excel Export How to export an excel file with one click Public function input (){ Ob_end_clean (); // clear the buffer to avoid garbled characters. Header ("Content-Typ: text/html; charset = UTF-8 "); Vendor ('excel.

Three things should never be put into the database, and the three are put into the database. Three things should never be put in the database I have already said in many speeches that the best way to improve your system is to avoid

Basic php Method for operating memcache cache, phpmemcacheHow to operate memcache in phpTo use memcache, you must configure the memcahche environment on the server! After confirming that memcahce can be connected normally, it can be used in the

Oracle BASICS (7): database transactions and oracle transactionsI. Basic Concepts1. Transaction: The basic unit of concurrency control. A transaction is a sequence of operations. These operations are either executed or not executed. It is an

Oracle Learning (12): stored procedures, functions and triggers, and oracle stored proceduresStored Procedures and functionsL The subroutines stored in the database for all user programs to call are stored procedures and stored functions.Note: When

The DB query analyzer allows you to easily create DB2 user-defined functions. The DB query analyzer allows you to easily create DB2 user-defined functions.Magenfeng(Guangdong Union Electronic Service Co., Ltd., Guangzhou 510300, China) SummaryThis

Is SQL Server's clustered index really the best ?, -- Simulate the environment first. The following describes how to USE [Temp] GO-drop table [TestTab] truncate table [TestTab] create table [dbo]. [TestTab] ([UserAcount] [varchar] (50) not null,

SqlServer server role and database role-related operations, sqlserver Database /* Role [server-server role] roles */-- view the fixed server roles (8, not added or deleted, not public, and each user belongs to the public server role) EXEC

Question 7: MySQL ---------- Duplicate Emails, email Write a SQL query to find all duplicate emails in a table namedPerson. + ---- + --------- + | Id | Email | + ---- + --------- + | 1 | a@ B .com | 2 | c@d.com | 3 | a@ B .com | + ---- + --------

No downtime xtrabackup create slave node, xtrabackupslaveMaster: 10.1.1.17: 3306 slave: 10.1.1.18: 3307slave node complete basic environment configuration: Create mysql users, install mysql software of the same version, xtrabackup software package,

Can I use expdp through dblink to export data from 9i Database ?, Dblinkexpdp Expdp/impdp is a 10g import and export tool, which is not available in 9i. Someone suggested using 10g expdp to export 9i data through dblink, but this is not the case.