Database Administrator

This is a problem where RMAN is used in the Oracle database for database operations. The backup performance is slow to unacceptable due to the improper configuration in the default configuration. The entire problem solving process involves storage

Data Structures Supported by redis: strings, lists, hashes, set, sorted set. Next we will do the experiment one by one. Strings operations include get/set/setnx, append, strlen, getrange/setrange, incr/decr/incrby/decrby, mget/mset. Get/set is to

This article summarizes mysql Data replication, migration, and conversion in various scenarios. 1. Import and Export Use the mysqldump command to export data files into a text file, which provides higher security in different scenarios. For example,

1. Memory Dumps 1). Global Area Alter session set events 'immediate trace name global_area level n '; 1 Including PGA2 contains SGA4 include UGA8 contains indrect memory 2). Library Cache Alter session set events 'immediate trace name library_cache

What is NLS_LANG? NLS_LANG is an environment variable used to define the language, region, and Character Set attributes. For non-English character sets, the setting of NLS_LANG is very important. NLS: 'national Language Support (NLS) 'when we set an

1. instr In Oracle/PLSQL, The instr function returns the position of the string to be truncated in the source string. Syntax: instr (string1, string2 [, start_position [, nth_appearance]) String1 source string to be searched in this string.String2:

Oracle transaction A general transaction (DML) is a transaction for data modification (addition, deletion, and modification ).The transaction adds a lock (Row-Level Lock) to all the data rows modified in the transaction to prevent others (sessions)

Configure replication and add the following content to/etc/my. cnf: Log-bin =/var/lib/mysql/binlogs/mysql-binMax_binlog_size = 100 MExpire_logs_days = 5Sync_binlog = 1Binlog_cache_size = 1 MBinlog-format = ROW As a result, an error is reported

Because the work requires a new database instance in the Oracle 11gR2 database. We recommend that you use oracle to perform the following operations. The order is as follows: 1. Create a parameter file for instance startup. Modify the default

The following content is from the patchset document. Oracle Database Patch Set Notes 11 gRelease 2 (11.2.0.3) Patch Set 2 E24903-01Patch Set OverviewOracle Database patch set, release 11.2.0.3 is a full installation of the Oracle Database software.

Ubuntu does not support Oracle. online tutorials are too complex and always contain errors. Later, you can find a one that can install XE. Oracle Database 10g Express Edition requires 1006 MB of swap space Echo"Deb http://oss.oracle.com/debian/

After the system runs normally for one month, the following error occurs on the first day of the launch. After a long time, you have no idea. Java. SQL. SQLException: Io exception: Connection refused (DESCRIPTION = (TMP =) (VSNNUM = 169869568) (ERR =

Parameters related to shared serverSHARED_SERVERS: Specifies the initial number of shared servers to start and the minimum number of shared servers to keep. This is the only required parameter for using shared servers. MAX_SHARED_SERVERS: Specifies

Global_name and db domain in Oracle 1. YouConnect ToSALES.US.EXAMPLE.COMAndQuery the GLOBAL_NAMEDataDictionaryView ToDetermineCurrent DatabaseGlobal name: CONNECTSYSTEM@Sales.Us.Example.Com SELECT * FROMGLOBAL_NAME; GLOBAL_NAME ------------

1. Download MySQLVersion I downloaded: mysql-5.5.22.tar.gz 2. uninstall MySQL that comes with CentOS before installation[Root @ localhost ~] # Yum remove mysql 3. Compile and install CmakeDownload cmake source package: http://www.cmake.org/files/v2.8

In the Oracle10g + rac + raw environment, the error "ORA-12545: connection failed because the target host or object does not exist" is often encountered during multiple connections: After the following statements are executed on the two nodes of

RMAN-03022: compiling command: allocateRMAN-03023: executing command: allocateRMAN-00571: ========================================================== ==============================RMAN-00569: ==================== error message stack follows ==========

SQL> startupORA-32004: obsolete and/or deprecated parameter (s) spec. The Oracle routine has been started.Total System Global Area 314572800 bytesFixed Size 1248768 bytesVariable Size 171966976 bytesDatabase Buffers 134217728 bytesRedo Buffers 713932

In Oracle 10 Gb, the following table's OBJECT_ID_FACTORY record is repeated. This is a dictionary table used to generate record primary key values for some tables. Duplicate key values cause some business operations to fail. This problem has

The storage process from Julian Dyke to test the single-core CPU performance can test the single-core CPU processing capability. By the way, I also tested SET SERVEROUTPUT ONSET TIMING ON DECLARE N NUMBER: = 0; BEGIN FOR f IN 1 .. 10000000 LOOP N: =