Database Administrator

MySQL Optimization-securely disabling MySQL instances Closing Process: 1. initiate shutdown and send a SIGTERM Signal 2. Create a shutdown thread if necessary) If the thread is disabled by the client, a dedicated thread is created. If the SIGTERM

Mydumper installation and installation fault Summary Mydumper is a lightweight third-party open-source tool for mysql database backup. The backup method uses the term logical backup. It supports multithreading, And the backup speed is much higher

Example of mydumper backing up MySQL database Mydumper is a lightweight third-party open-source tool for mysql database backup. The backup mode is logical backup. It supports multithreading, And the backup speed is much higher than the original

Test the initial creation of scott/tiger in Oracle Install the Oracle 11g database software on RedHat5.5 (32bit), install a database, log on to the database, and create scott/tiger for testing. First, log on to the database. The database is not

425th questions, 053425 425. Which of the following are stored in a transportable tablespace set? (Choose all that apply .)A. The datafiles that make up a self-contained group of tablespaces required for copyB. The system tablespaceC. An export of

521st questions, 053521521. You notice that a job in a chain has not completed on a nonconstrained RAC database. WhichThese are valid reasons why that might occur?A. The job priority is 1 and the resource consumer group CPU emphasis allocation is a

MongoDB Series 2: familiar with some common tools provided by MongoDB, mongodb Series 2 In our preliminary study, we can successfully run MongoDB on our own machine. However, there are some tools that we don't know in the bin directory. Next, we

SQL sever grouping and sqlsever grouping When maintaining personnel, the Personnel Bureau requires that a new function be added. The specific requirements are as follows: the added personnel are numbered in sequence in the same unit, and the unit

Use rman duplicate from active database to set up logging uard, rmandataguard Run {Allocate channel prmy1 type disk;Allocate channel prmy2 type disk;Allocate channel prmy3 type disk;Allocate channel prmy4 type disk;Allocate channel prmy5 type disk;

386th questions, 053386386. You have just successfully med a flashback table operation using the following command:Flashback table employees to scn 123456;The employees table has triggers associated with it. Which of the following statements is true

MySQL multi-Table connection Deletion DELETE is a very careful SQL operation. In general, DELETE operations must be careful to avoid unnecessary losses. DELETE has the following situations: ØDelete from t1 where Condition ØDelete t1 from t1 where

Beckham _ mysql stored procedure, Beckham _ mysqlStored ProcedureBrief:1. What is a stored procedure?2. Use stored procedures   I. Stored Procedure Similar to a function, a piece of code is encapsulated. You can call this stored procedure to execute

Database ranking SQL, group by group query by maximum time, sqlgroup First, give a simple table similar Drop table if exists 'toutiaoanchor'; create table 'toutiaoanchor' ('urid' int (10) unsigned not null, 'betintime' varchar (40) not null,

Error code: 1364 error message: Field 'platid' doesn' t have a default value, 1364 platId1. Error description Error code: 1364 error message: Field 'platid' doesn' t have a default valueinsert into 'use'. 't_ platform_scale '() values ()2. Cause of

Basic Database interview and database interview 1. Update table data (table_ B is updated through table_A) The structure of tables A and B is as follows: Create table [dbo]. [Table_A] ([Id] [varchar] (36) not null, [Name] [nvarchar] (50) NULL)

Mysql index type MYSQL indexes are classified into the following types: KEY or INDEX:A normal index is a general index different from a unique index. The column where the index is located can contain the same value. Therefore, the rows in the

MySQL create table as compared with create table like, mysqlcreate In MySQL databases, there are multiple ways to clone tables. For example, you can use create table... or create table. However, there are still some differences between the two

How to Use nested SQL statements to access SQLCA in DB2In IBM's relational database product DB2, SQL Communication Area (SQLCA) is used to return the running status of nested SQL statements in the program to the program. Specifically, you can call

[Translated from mos] When the asm disk is specified as FRA, The dbua hang of 11.2.0.3 stays at 11.2.0.3dbua. When the asm disk is specified as FRA, The dbua hang of 11.2.0.3 stays Source:11.2.0.3 DBUA Hangs While Specifying ASM Disk To FRA

MySQL Optimization-detailed explanation of cluster building steps and detailed explanation of mysql cluster building Reprinted please indicate the source: http://blog.csdn.net/l1028386804/article/details/46833179 1 Overview MySQL Cluster is a