Database Administrator

Hibernate establishes one-to-one association, and hibernate multiple-to-one Association The following content is organized from the second edition of Hibernate Ing code: The element establishes a customer ing between the customer attribute and

Regularly back up mysql Databases and linuxmysql databases on linuxRegular Database Backup/Usr/sbin/backupmysqlTimestamp = 'date + "% Y-% m-% d-% H-% M-% S "'Mysqldump-uroot-p '123456 databasename>/db $ timestamp. SQLChmod + x backupmysqlInstall

Centos 6.5 final installation xtrabackup 2.2.11 note, centosxtrabackup(1) download xtrabackupwget https://www.percona.com/downloads/XtraBackup/Percona-XtraBackup-2.2.11/binary/redhat/6/x86_64/percona-xtrabackup-2.2.11-1.el6.x86_64.rpm(2) rpm

Create and use a view When I typed a student's balance form to query the card_Info table and student at the same time, I returned the query content to the form. So I used the view. Now I want to share the view creation method: First, we need to know

ORA-4031 error solution, ora-4031 SolutionIn the face of ORA-4031 error, your heart will not send? The ORA-4031 can easily cause an abnormal database crash, which will crash when Oracle's core processes fail to get the Shared Pool memory. Of course,

The first time you get to know the database, you get to know your friends. The past few days of coming to the lab have been very full and have been exposed to many new technologies. At first, I felt very strange, but it was very interesting to come

Error code: 1305 PROCEDURE world. insert_data does not exist, doesnotexist 1. Error description 1 queries executed, 0 success, 1 errors, 0 warnings query: call insert_data () error code: 1305 PROCEDURE world. insert_data does not exist execution

Interview-MySQL and mysql interview questions 1. Features of transactions Transactions have four features: Atomicity, Consistency, Isolation, and Durability ). These four features are also referred to as ACID. (1)AtomicityTransactions are the

In centos7, Mairadb forgot to change the password. centos7mairadb I forgot the Mairadb password under centos7. As shown in Use the vi editor or nano Centos7 does not seem to have its own nano installed with yum-y install nano Open it later

A database question encountered during the interview and a database encountered during the interview I have interviewed many organizations over the past few days and made some pen-related questions. I will recall and sort them out. The following

SQL Server Mass Data Query code optimization and recommendations, SQL data query1. Try to avoid null value judgment on the field in the where clause. Otherwise, the engine will discard the index andFull table row scan, for example:Select id from t

SQL ISNULL and sqlisnull Replace NULL with the specified value.ISNULL is used to determine the value you intend to replace when the selected column is null. ISNULL (check_expression, replacement_value) Select case when m. [end date] is null then

Run hbm2java and hbm2ddl tools, and hbm2javahbm2ddl The following content is organized from the second edition of hibernate Hibernate provides a conversion tool from the ing file to the Java source code, named hbm2java, which can be run using ANT.

502nd questions, 053502502. A database is running In ARCHIVBXXMS mode. It has two online redo log groups and each groupHas one member.A lgwr Input/output (I/O) fells due to permanent media failure that has resulted In the loss of redo logFile and

The oracle stored procedure is defined and debugged and finally called by C, C # Call a stored procedure I have read a lot of articles and wrote the following text to share it. Purpose: To change the credits and perform a certain verification I.

Mongodb Sharding terminology, mongodbsharding ShardingExponential data sharding ClusterA cluster contains multipleShards, EachShardByReplica setComposition CollectionThe table concept in DB, but no schema In sharding scenarios, each collection

Encapsulate PL/SQL code in a smart package, and plsql package Encapsulate code in a smart packageHttp://www.oracle.com/technetwork/issue-archive/2013/13-jan/o13plsql-1872456.html The vast majority of PL/SQL-based applications are composed of

Import the database in SQL Server to the PowerDesigner and powerdesigner databases. After using PD to create a table, compile it into an SQL script and run it in SQL Server to generate a database. Can I directly generate a PD document for the

Thinkphp environment configuration and Thinkphp environment Configuration 1. After wampserver is installed, we will see the related icons turn green;2. After Entering localhost in the browser, we can see the corresponding introduction interface.3.

Oracle PLSQL, oracleplsql PL/SQL Developer is an integrated development environment dedicated to developing Oracle database-oriented applications. PL/SQL is also a programming Language called Procedural Language/SQL. It is an extension of SQL