Database Administrator

After DB2 is started successfully, it stops automatically after about 10 minutes, and the disk space is insufficient. Problem description: After DB2 is started successfully, it stops automatically about 10 minutes later. Solution: 1. view the DB2

A horizontal table is a common table creation method. For example, a table has the following structure:Primary Key, Field 1, Field 2, Field 3...If it becomes a vertical table, the table structure is:Primary Key, field code, and field value.The field

Mysqladmin MySQL client management tool Flush-hosts Flush all cached hosts (max_connect_errors)Refresh all information in host BufferFlush-logs Flush all logsRefresh all logsFlush-status Clear status variablesClear status variablesFlush-tables Flush

The mysql5.6 subquery is no longer a vase or a decoration. Mysql subqueries have always been known for poor performance. Therefore, the solution is to replace subqueries with table connections. In mysql, subqueries are only considered a function

Analytic functions compute an aggregate value based on a group of rows. they differ from aggregate functions in that they return multiple rows for each group. the group of rows is called a window and is defined by the analytic_clause. for each row,

Recently, I wrote a tutorial to implement automatic and timed backup for MySQL in Linux for later reference. I would like to share it with you. If you have any questions, please try again. The premise is set to 00:00 in the morning, so that the

1. Use the trace file to restore SQL> alter database backup controlfile to trace; -- back up the control file to the trace file Database altered. SQL> @ gettrace -- get the path of the trace file TRACE_FILE_NAME---------------------------------------

There are two origins:1) Frequent redo records2) server process generates a small amount of data each time. If the redo log file generated each time requires a large number of highly concurrent SPSS to write the redo log file, there are two problems:

For cainiao, I would like to explain [install mysql]. It is a general term to use the mysql database on linux, but it is unclear how mysql runs. In fact, mysql is divided into mysql server and mysql client. Therefore, these two [software packages]

Today, the undo tablespace of a database on the development side does not know who has set it to auto scaling. What is called House leakage is that the development staff ran a huge task today, then the direct consequence is that the undo tablespace

This article describes how to install the OracleDatabase 11g Release 2 64bit database on the 64ora17 64bit system. Assume that you have installed the 64ora17 64bit operating system and the swap partition is 2 GB, linux security is disabled and the

MySQL is a scarce resource for PHP programs. By default, the maximum number of connections for MySQL is 100, that is, a maximum of 100 MySQL clients can be connected. Therefore, PHP has made some optimizations when using MySQL connections. These

This article describes how to use vmware server in Red Hat 5.5 to install Oracle 10g RAC (OCFS + ASM). This article assumes that your RHEL5 has been installed, the specific configuration and installation process of Linux are listed below. I.

When executing the following command, you must first enter db2cmd in the running of the client to initialize or su to the db2 instance. I. Common sense commands 1. db2 connect to -- connect to the local database name Db2 connect to user using --

If the prompt says no... /oracle/11g/Solaris/j2ee/oc4j_applications/applications/em. ear file. After downloading the Oracle 11g, decompress the package and there are two folders. This error occurs because the file copy is incomplete, you only need

Exp test/test file = test. dmp wner = test log = exp. logErrorEXP-00056: Oracle error 29275 encounteredORA-29275: partial multibyte character.EXP-00000: Export terminated unsuccessfully Cause: inconsistent character sets Oracle @ MDSWEBDB01:>

Today, the customer reported that the query was slow. Because the query was in a production environment, the test was not allowed. Therefore, refer to the following blog to export the statistics to the test server for SQL statement optimization. 1.

Part 1: Test conditions A. IP Address 192.168.1.52 node1 192.168.1.53 node2 192.168.1.55node1-vip 192.168.1.56 node2-vip 10.10.10.52 node1-priv 10.10.10.53 node2-priv 192.168.1.60 racdb-cluster-scan B. Version: Oracle 11gR2 (11.2.0.2) Part 2: Test

UNDOThe tablespace is restored when there is hot standby and no transaction occurs. First, let's take a look at ensuringUndoNo transactions in the tablespace SQL> select XID USN, XIDSLOT, XIDSQN fromv $ transaction; No rows selected Second, confirm

1. First, you must understand that the dmp file imported and exported from Oracle is executed using the cmd command, rather than SQL plus. You can also use PLSQLDev to import and export data. Note that the executable file export selects the