Database Administrator

How can I lose weight for your database transaction logs? In most SQL Server work environments, especially in OLTP environments, when the transaction log performance of the database encounters a bottleneck, it usually takes more time to complete

LeetCode OJ Employees Earning More Than Their Managers, leetcodeoj TheEmployeeTable holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id. + ---- + ------- + -------- + ----------- +

Database optimization tutorial (6) index-related operations, tuning IndexesIii. Index 3. Index-related operations In the previous section, we introduced the functions and types of indexes. This section describes the operations related to indexes! 1)

Mysqllimit is a serious risk when mysql uses both order by and limit queries. I often use order by and limit to display and sort data by PAGE, and I have never found any problems. However, there was a serious problem during the past two days. When

LeetCode OJ Consecutive Numbers, leetcodeoj Write a SQL query to find all numbers that appear at least three times consecutively. + ---- + ----- + | Id | Num | + ---- + ----- + | 1 | 1 | 2 | 1 | 3 | 1 | 4 | 2 | 5 | 1 | | 6 | 2 | 7 | 2 | + ---- +

Mysql startup Error [Root @ itcast02 itcast] #/etc/init. d/mysql restart // start the service ERROR! MySQL server PID file cocould not be found!Starting MySQL ...... ERROR! The server quit without updating PID file (/var/lib/mysql/itcast02.pid). //

A small example of grouping and summation in oracle Cold weather in April 9, 2015Table gw_log is designed as follows: Name Type Nullable Default Comments ------------ ----------- -------- ------- ---------- ID VARCHAR2 (50) Message id SERVICE_ID

User, group, or role 'test' already exists in the current database, error 15023, exists15023Directory Directory Error Message Solution -Method 1 -Method 2 Error Message Solution-method 1 Create a

Mybatis study notes, mybatis I. The database Field Names and object class names are different 1.1 prepare data tables and data CREATE TABLE orders(order_id INT PRIMARY KEY AUTO_INCREMENT,order_no VARCHAR(20), order_price FLOAT);INSERT INTO

Project Database Design and Project Database Design The database system is not only designed once. I was designed during this interview, so I once again flipped out the textbooks I used to take the test and made some new discoveries in the database

Use sqlserver to sequentially number each group of records. Use sqlserver to sequentially number each group of records Project business needs to number each group of records to help you locate a specific row for each person when performing column

System Overview, AerospikeSystem Overview) Aerospike is a distributed and scalable NoSql database built for the following three main objectives: Create an elastic and scalable platform that meets the needs of today's network platform applications

Ubuntu MongoDB 32-bit installation, tumongodb Download 32-bit MongoDB: https://fastdl.mongodb.org/linux/mongodb-linux-i686-3.0.1.tgz Unzip: tar-zxvf/mongodb-linux-i686-3.0.1.tgz Go to the MongoDB directory Create two files Mkdir data // store

ORACLE exercises, oracle1. Create a new table a with the same table structure and data as emp.Create table a as select * from emp;2. Add primary key constraintsAlter table a add constraint pk_a_01 primary key (EMPNO );3. Add a field 'birthdate' for '

Run scripts to generate reports of hybrid data sources and reports. You can use different data sources in the same report, such as RDB, TXT, Excel, JSON, HTTP, Hadoop, and mongodb. If you use a hybrid data source in a computing report that does not

Article Title dual table use in Oracle Database, oracledual I. business scenarios The business process needs to be written and updated, so there are original tables and historical tables.The table ID must be unique and the IDs of the two tables

Index principle and data structure in MySQL database, mysql Index There are three types of indexes in MySQL: 1. Primary Key Index: Use a primary key as a unique index. 2. Regular indexes: the implementation method is B tree and hash table. 3.

No response to oracle login solution (oracle4612267 patch installation tutorial), oracle11g installation tutorial At about noon today, I suddenly received a text message prompting me that the company's software had not produced a ticket for a long

[Translated from mos] monitors the progress of the flashback database,Monitor the progress of the flashback databaseReference:How to determine flashback database progress (Doc ID 1071391.1)Applicable:Oracle Server-Enterprise Edition-Version 10.1.0.2

Mariadb introduction, mariadb 1. Introduction to mariadb Official Website: https://mariadb.orgMariaDB was developed by Michael Widenius, MySQL founder. He sold his own company MySQL AB to SUN for $1 billion, as SUN was acquired by Oracle, the