"Panic" caused by redo logs when RMAN_RAC is restored to a single machine"

"Panic" caused by redo logs when RMAN_RAC is restored to a single machine" I. Summary In fact, this problem was caused by negligence. Previously, RAC was used to recover data from a single machine. The production environment was not involved. At

ORA-28000: the account is locked resolved

ORA-28000: the account is locked resolved In Oracle, if the account fails to log on for ten consecutive attempts, the account will be locked ). When you log on with a locked account, the system reports an error: ORA-28000: the account is locked.

How to recreate the RAC Control File

How to recreate the RAC Control File In the following situations, you may need to recreate the control file: O all control files are damaged or lostO no backup for the control file or the backup is damaged The following describes how to reconstruct

Whether the DML operation affects the exported data during EXP Export

Whether the DML operation affects the exported data during EXP Export I. Overview With the upgrade of the database version and the increase of business testing, database or data migration has become one of the common tasks of database managers. If

Redis memory fragments

Redis memory fragments Redis uses jemalloc to allocate memory by default. According to the best article in fast '14, when a variable-length key-value load occurs, the fragmentation problem may occur: low memory utilization, the actually allocated

ERROR 1129 is reported during MySQL connection.

ERROR 1129 is reported during MySQL connection. Problem description: ERROR 1129 is reported when the mysql command is used to connect to the mysql database; ERROR Description: ERROR 1129 (HY000): Host 'mysql02' is blocked because of unknown

Method for separate login when MariaDB and MySQL coexist

Method for separate login when MariaDB and MySQL coexist Finally, I completed the login method when MariaDB and MySQL coexist. At that time, I knew that the installation was successful, that is, I could not log on to MariaDB. I would like to share

Change the MySQL root Password from null to 123456

Change the MySQL root Password from null to 123456 Requirement: Change the MySQL root Password from null to 123456. Use mysqladmin Mysqladmin-u root-p password mypasswd After entering this command, enter the original root password (empty), and

MySQL master-slave Replication

MySQL master-slave Replication The principle of MySQL master-slave replication is the same as that of MySQL master-slave replication, but slave databases cannot be used for write operations, therefore, some parameter configurations may be different

Using Keepalived to build master-master MySQL Replication

Using Keepalived to build master-master MySQL Replication Overview: MySQL-HA has many implementation solutions. It is common to use master + keepalived to implement MySQL-HA. The two MySQL instances have a master-slave relationship and use

Five most common problems that cause RAC instance crashes

Five most common problems that cause RAC instance crashes Five most common problems that cause the RAC instance to crash (Document ID 1549191.1) Applicable: OracleDatabase-Enterprise Edition-version 11.2.0.1 and laterThe information contained in

Relational database integrity

Relational database integrity 1. Relationship: D1 × D2 ×... * The subset of Dn is called in the domain D1, D2 ,... The relationship on the Dn, expressed as R (D1, D2 ,... Dn), R indicates the name of the link, and n indicates the link ContentsOr

Oracle data migration (from Oracle11G to Oracle10G) and oracle11goracle10g

Oracle data migration (from Oracle11G to Oracle10G) and oracle11goracle10g1. Database statusThe production environment is 11 GB, the linux system, and the testing environment is 10 Gb. For windows systems, you need to export all the data of a user

Use Cases of Oracle update + with, oracleupdate

Use Cases of Oracle update + with, oracleupdateDrop table test purge;Create table test (Id number,Code varchar (20 ),Name varchar (20));Insert into test values (1, '20170101', 'aaa ');Insert into test values (2, '20170101', 'bbb ');Insert into test

SQL % rowcount: Number of affected rows returned; SQL % rowcount: number of rows returned

SQL % rowcount: Number of affected rows returned; SQL % rowcount: number of rows returned In oracle, the number of affected rows returned is: If SQL % rowcount Example: Update ut_calenderStatus t set t. calenderstatus = pi_flg, t. m = pi_M, t.

Mysql advanced master-slave replication, mysql master-slave

Mysql advanced master-slave replication, mysql master-slave Master-slave replication is more than multiple servers !, One change changes the other, and the content is actually the same! Principle: Operations on the database will generate a file,

ORA-12520 error solved one, ORA-12520 error solved

ORA-12520 error solved one, ORA-12520 error solved Problem description: An error was reported when I suddenly found a connection to the database today. When I use pl/SQL dev to connect to data, sometimes I can connect to the database. Sometimes I

The lock request timeout period has been exceeded. (Microsoft SQL Server, error: 1222), sql1222

The lock request timeout period has been exceeded. (Microsoft SQL Server, error: 1222), sql1222 When operating the SQL Server database, the following problem occurs: the lock request timeout period has been exceeded. (Microsoft SQL Server, error: 12

SQL EXISTS usage and SQLEXISTS usage

SQL EXISTS usage and SQLEXISTS usageFor example, a query in the Northwind database isSELECT c. CustomerId, CompanyName FROM Customers cWhere exists (SELECT OrderID FROM Orders o WHERE o. CustomerID = c. CustomerID)EXISTS is used to check whether a

Use the kettle component to import an excel file to the database, kettleexcel

Use the kettle component to import an excel file to the database, kettleexcel Use the kettle component to import an excel file to the database 1. Goals Import the excel file content to the target table. Then, use java to call kettle conversion. The

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