Database Administrator

After modifying the storage path of the mysql database, you can't start it until you have forgotten it. Later, you can view it in ls-Z. It turns out to be selinux. You can use chcon-t mysqld_db_t/home/mysqlData. The method for changing the database

Data source configuration: in jboss/doc/examples/jca, if you are a mysql database, select mysql-ds.xml DefaultMySqlDS jdbc: mysql: // localhost: 3306/itcast?UseUnicode = true & amp; characterEncoding = UTF-8 org. gjt. mm. mysql. Driver

Redo and Undo Redo and its Functions Undo and its Functions Relationship between Redo and Undo Submit and roll back LogMiner-based Log Analysis 11.1 Redo and its Functions 1.1.1Redo is used to restore committed transactions, so as to ensure

PL/SQL table --- table () function usage/* PL/SQL table --- table () function usage:Using the table () function, we can replace the result set returned by PL/SQL. Oracle memory tables are frequently used for queries and reports. They are dozens of

Install Mysql on both servers in the/usr/local/mysql directory (the installation steps are omitted. Refer to the relevant documentation ), the IP addresses of the two servers are 192.168.0.1 and 192.168.0.2. We use 192.168.0.1 as the master database

1. Use Groovy in EO attributes Excellent: Simple and Direct Missing: disconnected number (New Oracle. jbo. server. SequenceImpl ("XXXX_SEQ", adf. object. getDBTransaction (). getSequenceNumber () 2. assign values to attributes in the create method

InLinuxAfter the installation is completeRMANThe following error may occur: [Oracle @ smsdbrac1 oracle] $ rman target/ Rman: can't open target   This is because the call is notOracleOfRMANReason: [Oracle @ smsdbrac1 oracle] $ which

From Oracle 9i, there are two methods to manage a Segment Space: manual Segment Space Management and automatic Segment Space Management (ASSM ); ASSM uses bitmap to track or manage each block allocated to an object. The remaining space of each block

The failure of the ora-00600 [12700] is generally due to an error in the table or index data block Fault symptom: The user reported that an error was reported when the next simple select command was executed. Select * from in_past t where t.

1. view the table created by the user (Table Name and comment) -- View the table name Select*FromUser_tab_commentsWhereTable_nameLike 'Tb _ %'; If: 2. view the table name, column name, and field type information. SelectCol.

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 *

When importing the attachment table AFFIX, the data volume is more than items, but AFFIX has a large blob field, which makes the query very slow, the network in the working environment is very unstable. I started to import it for about half.

1. Shrink Oracle10g Database files: 1.1 questions: A database contains millions of data records. After the Delete statement is used to Delete most of the data, the space occupied by the database files will not be reduced to free up extra space. For

Psychological preparation: 1. when I installed Oracle on Linux for the first time, I felt a lot of trouble. As a result, I gave up the first time I didn't install it halfway. Because I was used to the next step on the Window interface, it was

Create or replace type address as object (province varchar (20), city varchar (20 )); Alter trigger sys. JIS $ ROLE_TRIGGER $ compile; Create table test (id number primary key, name char (50 ));Tablespace authorizationAlter user quota unlimited on

When hql is used in Hibernate for query, list or Iterator is usually used to obtain the query results. Here we will briefly describe the differences between the two methods and applicable scenarios. List: The queried results will be fully stored in

: Http://dev.mysql.com/downloads/mysql/5.5.html#downloads The system will be selected after entering After selecting linux-generic, there are many product options. We can download only the following two. Server: Linux-Generic 2.6 (x86, 32-bit), RPM

View All jobs: select * from dba_jobs; Add a JOB with parameters. Method 1: Begin Sys. dbms_job.submit (job =>: job1, What => 'Clare n1 number (6); s2 varchar2 (2000); begin pkg_xnb.prc_all (n1, s2); end ;', Next_date => to_date ('2017-02-16 20:00:00

Functions of several views, from official documentsV $ sqltextV $ SQLTEXTDisplays the text of SQL statements belonging to shared SQL cursors in the SGA.V $ SESSIONV $ SESSIONDisplays session information for each current session.V $ wait_chainsV $

1. Install unixODBC UnixODBC Official Website: http://www.unixodbc.org/ Here YUM is used for installation, not to mention: Linux uses a CD to build a local YUM Server [Root @ rac1 mnt] # yum installunixODBC [Root @ rac1 mnt] # yum