Database Administrator

1. OPatch tool description The opatch tool was mentioned in the previous Oracle patch system blog: Introduction to Oracle patch system and opatch tools Since version 9.2, Oracle has implemented the opatch patch installation tool. opatch uses a

Question: Recently, a set of database orders by customers often suffer from high data and business pressure. When RMAN performs full backup or Incremental backup, a large amount of business needs to be processed at this time, system resources will

To execute the exp or imp command, first: 1. Check whether exp.exe and imp.exe files exist in the bin directory of the Oracle installation directory. Otherwise, the command may fail to be executed. 2. Alternatively, you can directly enterIn the bin

Oracle Database-based data synchronization technology can be divided into two types: data synchronization technology provided by Oracle itself and data synchronization technology provided by third-party vendors. Oracle's own synchronization

104 scp to 25Scp/opt/Oracle/111/dbs/initORCL. ora root@10.1.0.25:/opt/oracle/111/dbs/initORCL. oraScp/opt/oracle/111/dbs/spfileORCL. ora root@10.1.0.25:/opt/oracle/111/dbs/spfileORCL. oraScp/opt/oracle/111/dbs/orapwORCL root@10.1.0.25:/opt/oracle/111

View the operating system version: [Root @ rac1 ~] # Cat/etc/issueEnterprise Linux AS release 4 (October Update 7)Kernel \ r on an \ m View the kernel version: [Root @ rac1 ~] # Cat/proc/versionLinux version 2.6.9-78.0.0.0.1.ELsmp

1. Install the OS requirement packageBinutils-2.17.50.0.6-2 (x86_64)Compat-db-4.2.52-5.1 (x86_64)Compat-libstdc ++-296-2.96-138 (i386)Compat-libstdc ++-33-3.2.3-61 (x86_64)Compat-libstdc ++-33-3.2.3-61 (i386)Control-center-2.16.0-14 (x86_64)Gcc-4.1.1

1. Introduction The full-text index plug-in is used to expand the full-text retrieval feature of MYISAM. Through full-text search, we can perform word segmentation on documents, images, videos, and other data types to create an index for quick

I finally completed multiple mysqld configurations on a single machine. I used the mysqld_safe command to complete the configuration. Step 1: Install the database: ./Configure -- prefix =/usr/local/mysql-master Make & make install ./Configure --

To determine the size of the UNDO tablespace required by Oracle, the following information is required: UR    UNDO_RETENTION in secondsUPS  Number of restored data blocks generated per secondDBS   Db_block_size UndoSpace = [UR * (UPS * DBS)] + (DBS *

I. OverviewSGA, PGA, and UGA are all memory zones managed by Oracle.SGA (System Global Area) is the most important memory Area in Oracle.PGA (Process Global Area), that is, the Global Area of the program, a dedicated memory Area of the Process.UGA

Note: This article is not to give you a case, but to explain the optimization method. The Ancients cloud: it is better to teach people to fish than to teach people to fish. Here we will talk about how to fish. The SQL optimization mentioned here is

Now let's talk about the meaning of each parameter in the Oracle execution plan. The following is an example. Here is a supplement.: Trace types: Serial number Command Explanation 1 SET AUTOTRACE OFF This is the

Hibernate is an open-source object relationship ing framework that encapsulates JDBC objects in a lightweight manner, so that Java programmers can use the object programming thinking to manipulate the database as they wish. Hibernate can be used in

Instance:Create a USERINFO database table: Of course you can write it like this:Drop table USERINFOCreate table USERINFO(EnglishName varchar (30 ),ChineseName varchar (30 ),Sex varchar (10 ),Age int,BirthPlace varchar (100 ),BirthDate date default

In addition to the built-in DBCA, Oracle can create databases. Another method is to manually create databases, which must be mastered by DBAs. The following describes how to manually create a database:To manually create a database, follow these

1. Introduction to swingben  Currently, open-source Oracle stress testing tools on the network are mainly orabm and swingbench. Because orabm does not support oracle 11g, this test uses swingben for stress testing. In addition, swingbench can also

InLinuxInstalled onOracle 10g In the future, we will often useIsqlplusTo executeSQLStatement. But normalIsqlplusThe logon interface only supports Logon as a common user.SysIdentity permission to perform some operations, then how can

Database users should not be locked 1) view the default number of database locks[SQL] SQL>SetLinesize 2000 SQL>Select*FromDba_profilesWhereResource_nameLike 'Failed _ LOGIN_ATTEMPTS %'; PROFILE RESOURCE_NAME RESOURCE LIMIT --------------------

The slave server reports an error due to the abnormal restart of the master server. The error is as follows:Show slave status error: mysql> show slave status\GMaster_Log_File: mysql-bin.000288Read_Master_Log_Pos: 627806304Relay_Log_File: mysql-relay-