Database Administrator

Logical and physical databases in Oracle Oracle abstracts the logical storage structure to adapt to different underlying physical structures. There are two advantages: (1) so that Oracle users only need to understand the data logic and do not feel

Incremental Backup solves the log GAP in the DataGuard Database Sometimes the standby database lags behind the primary database for a long time, and the archive log of the primary database does not exist. How can we eliminate the log interval at

Execute MySQL statements in Shell scripts For automated O & M, such as backup and recovery, DBA often needs to encapsulate SQL statements into shell scripts. This article describes several methods for calling SQL statements in a MySQL database in a

Provider: named pipeline provider, error: 40, providererrorAn error occurred while establishing a connection to the server. When you connect to SQL Server 2005, the default setting does not allow remote connection to SQL Server may cause this

EXtremeDB, extremedb Open Source The customers got the shared memory 80 error on AIX environment; utility truss is used to track the debug info, eXtremeDB. registry access error is found. release notesdescribed as follows: These names are

Rac_grid self-check failed to report PRVF-4007, rac_gridprvf-4007 Original Works are from the blog of "Deep Blue blog". You are welcome to reprint them. Please note the following source when reprinting them. Otherwise, you will be held legally

Oracle Foreign Key usage (2)-delete cascade and oraclecascade DELETE CASCADE)Target This example shows how to use cascading deletion in Oracle Foreign keys. What is delete cascade )? Cascading deletion means that when a record in the primary table

ORACLE tree query and oracle tree Query The front-end tree structure varies according to personal permissions. For all my queries, You need to query all the subnodes and the information of the current node based on the tree ID. Select * from table

The status of the Hibernate Persistence object.1. From the perspective of persistence,Hibernate divides objects into four states.:Persistence status,Temporary status,Free Status (off-pipe status),Delete state. The Session method can convert an

Oracle _ Common grouping functions and oracle grouping FunctionsZookeeper Oracle _ Common grouping Functions① Grouping Function1. max (column): calculates the maximum value, which is not required for the data type. Any data type can be used.2. min

The length of Chinese Characters in Oralce and the length of oralce Chinese Characters Generally, we use the String. length () method when verifying the String length at the Java layer. The returned length is the same in both Chinese and

Difference in the usage of in/not in and exists/not exists in SQL, sqlexists 1; first, the usage of in/not in In/not in is used to determine whether a single attribute value matches a given value or a subquery value; Select * from Student s where s.

Mysql binlog parameter settings, mysqlbinlog1. mysql has many system variables that can be set. Different system variables may lead to different system running states. Therefore, mysql provides two groups of commands to view the system settings and

MySQL kernel InnoDB Storage engine (Volume 1) notes, mysqlinnodbMySQL kernel InnoDB Storage engine (Volume 1) Directory 1 Overview 2. Basic data structures and algorithms 3. Synchronization Mechanism 4. Redo logs 5mini-transaction (mtr) 6.

How can I listen to others' call records? QQ1622863529Query serviceConsult QQ: 1622863529 to query QQ chat records, chat content queries, QQ audio queries, video content queries, delete QQ chat records, modify QQ chat records, and delete chat

Atitit. Software GUI button and dashboard -- db database zone -- Solution to importing mysql SQL errors, atitit -- db Atitit. Software GUI button and dashboard -- db database zone -- Solution to importing mysql SQL errors   Keyword: part after

Hierarchy is an idea and an idea.The database has a three-tier mode and two-tier image. This layer is designed as needed and has certain functions for each layer. This design concept of "performing their jobs" is not only used in databases, but also

Modify the redolog size of the oracle dg bad environment master database, dgredolog-- Standby database standbyThe four redologs in the master database were previously 50 MB in size.SQL>Alter database recover managed standby database cancel; Database

SQL Server transactions, indexes, views, SQL Server Transaction concept:A transaction is a mechanism that contains a set of database operation commands and submits or revokes all commands to the database as a whole.These commands are either executed

Single-row oracle FunctionsZookeeper Single Row Function①. Character FunctionsLOWER (x): converts each word in x to lowercase.UPPER (x): converts every word in x to uppercase.INITCAP (x): converts the initial letter of each word in x to