Database Administrator

When learning PHP, you have mastered the basic syntax. After learning about the variables, you should learn the basic operations php has on the mysql database. connect to the database using php. The function used for mysql database connection is

Oracle determines whether the varchar2 type is null.VV_LIST: = 'dsssfdfdsfds ';IF (VV_LIST <> '') THENDBMS_OUTPUT.PUT_LINE ('ppppppppppppppp ');ELSEDBMS_OUTPUT.PUT_LINE ('bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb ');End if; The result is printed with

Looking at the fat Oracle client on my computer, I almost never used anything like the Enterprise Manage Console. Its existence is a waste of my computer space. So I checked on the Internet to see if I could unmount the ORACLE client and use PL/SQL

I have previously studied how to build a mongodb environment (see). Considering that the mongodb cluster environment will be used in the future and the multi-bit 32-bit OS environment, I have constructed a mongodb cluster environment. For details

In SQL server, the number of affected rows returned is: If @ RowCount In Oracle, the number of affected rows returned is: If SQL % rowcount Example: Sqlserver:[SQL] AS BEGIN UpdateT_MtSetStat = @ Stat, OStat = @ Stat, RptTime = Getdate

AIX5.3 Oracle10G RAC environment, when creating a LV because CHMOD, CHOWN is not synchronized in two nodes, resulting in nodes with no permissions set reported ORA-01186 \ ORA-01157 \ ORA-01110 error, then, the data file problem occurs during the

Join is a predicate that tries to combine two tables. Only two tables can be connected at a time. Table Join can also be called table Join. In the subsequent descriptions, we will use "row source" instead of "table", because the use of row source is

Personal definition: Primary prosecution: maintain one side of the joined table, usually the Creator side, which will be more efficient. Operation Principle: If inverse is set to false, one is set to true. When cascade is used to check the

I,Dictionary tables are commonly used. You can set these tables to use the keep pool.First, analyze the dictionary table in the solution for computing space. For simplicity, analyze all the tables and call the stored

The MySQL innodb Storage engine uses the same row lock mechanism as Oracle. The following experiment shows how to view the row locks in the system. The following is the test process:Session 1: update records Mysql> set autocommit = off; Query OK, 0

1.5.1.3Raw Devices Raw devices are disk partitions or logical volumes that have not been formatted with a file system.When you use raw devices for database file storage, Oracle writes data directly to the partition or volume, bypassing the

SQL code Create Or Replace ProcedureP_outputdebug (a varchar2, B varchar2, c varchar2) Is VFileName varchar2 (100 ); OutputFile UTL_FILE.FILE_TYPE; Begin Select 'Rfid _'| A. rfid |'. Log' IntoVFileName FromTbl_animal_infoWhereA. rfid ='123'

I. Error code: ORA-12547Symptoms:(1) Oracle listening and Service Startup are normal and no error is reported(2) Check the log without any exception information(3) The local commands on the server can connect to oracle and execute query commands.(4)

When Grid Control 10.2.0.3 is installed on RHEL5.4 and configured in OMS, an error occurs:Configuration assistant "OMS Configuration" failed-----------------------------------------------------------------------------The

Recently I tested nosql. After HandlerSocket is installed, the primary key of the table to be created is the auto-increment id. The result is the ID specified during the insert operation, and a conflict occurs .... error 121 is reported. After

A customer came up with a strange problem. In a large table with tens of millions of records, SELECT * FROM where rownum 10 minutes later, he sent the TRACE via QQ: SELECT * FROM ttt where rownum   Call count cpu elapsed disk query currentrows ---

When performing a redolog loss recovery test, you can delete Oracle redolog in the open Database state, and the database still works normally. The database can perform regular operations, or even create tablespaces, perform log switching, and

Error:1)Caused by changing the master:Last_IO_Error: error connecting to master 'repl1 @ IP: 100'-retry-time: 60 retries 2)Stop the slave process without unlocking:Mysql> stop slave;ERROR 1192 (HY000): Can't execute the given command because you

When the levelDB is mounted to the MySQL engine, it is found that MySQL's heterogeneous data synchronization is simpler and more common when the actual storage is in the key-value format. Take tair as an example to briefly describe a MySQL-based

Background Statistical queries are time-consuming queries. The usage scenario is that QPS is not large. Each Query Needs to access a large amount of data and process a large amount of data for a long time (usually more than seconds ). Analysis A