Oracle

Database backup Everyone knows that regular backups are scheduled daily, but few people do the verification of backup files. Once we need to use the backup file, the backup file is really damaged and it's sad. It is necessary to do the backup

There are many application projects, just start with MySQL database can basically achieve a variety of functional requirements, with the increase in application users, data volume increases, MySQL gradually appeared overwhelmed: the connection is

1. MySQL1) Build Tableauto_increment: The primary key ID of the Customer table (customers) is automatically increased by 1 per insert of data, as shown below 1 Create TableCustomers --Create a Customer table 2 (3IdintAuto_incrementPrimary Key not

1, the purpose of the experimentAnswer the question before the experiment-using different partition granularity for the same data, but creating global spatial indexes, Q: Are their global spatial indexes consistent?How can it be considered the same?

Throw a question first:I have a table T, and now I want to update 1/4 of the records in my table, my SQL is as follows:Update t set col1= ' 123 ' where mod (rownum,4) =1Can I get the results I want?The answer is: No.Let's illustrate by an experiment.

/* Modify User password:1. Enter CMD to open the DOS window2.sqlplus/nolog3.conn/as SYSDBA4.alter user system identified by ORCL;*//**Data integrity refers to the correct state of all data values stored in the database.If an incorrect data value is

I. Source of the subjectThe project "The construction of Oracle database application experiment platform" comes from the actual teaching work needs, along with the progress of science and technology, the development of network, almost all

The DBA will not be unfamiliar with this file, and it must be the Sqlnet.ora used to determine how Oracle parses a string that appears in a connection, for example: Sqlplus Sys/[email protected]So how does this ORCL parse? If your Sqlnet.ora is

Julian Date DefinitionJulian Date: The valid date range is from January 1, 4713 BC to December 31, 9999. Julian Date is the number of days elapsed since 12 o'clock noon January 1, 4713.Using it Julian date allows us to calculate how many days

DDD is the day within a year of the number of days, D is within a week of the first day, DD is within one months ofDy:day of week abbreviated Mon, Tue, FriDay:day of week spelled out Monday, Tuesday, FridayD:day of Week (1–7) 1,2,3,4,5,6,7--Note:

Oracle database part moved to flash storage solution 1. Implementation requirements 2. Confirm the migration of tablespace information 3. Confirm Redo Information 4. Confirm the Undo information 5. Table space migration to

Sequence SEQUENCEis also one of the database objects that generates some column numbers according to the specified rules.A sequence is usually used to provide a value for a table's primary key.Primary key: Usually each table has a primary key field,

(This article original, quote please specify source--zhangjieatbky) Scenario: For example, to convert an ID value stored in a field, such as a to a text display, such as basketball, soccer, volleyball Create two tables 1 CreateA1 (ID

Oracle Index Details (ii)--Index classification?? Oracle provides a number of indexing options. Knowing which option to use under a given condition is important for the performance of a program. A bad choice can cause a deadlock and result in a

Starting and shutting down in Oracle is roughly 3 steps from starting the instance, loading the database, opening the database, shutting down the database, uninstalling the database, shutting down the Oracle instance, respectively. So in Oracle

Basic usage of ORACLE tablespace creation, management, and deletion 1. Create a Permanent Table -- Create a permanent tablespace TEST01 with a size of 50 MB. do not automatically expand the data file create tablespace TEST01loggingdatafile 'f: \

Oracle redo log file (Code instance), oracle Log File 1. query information about the redo log file group. select group#,sequence#,members,status,archived from v$log; 2. query the information of the redo log file select group#,type,member from

Create and use two temporary tables for Oracle databases. In addition to permanent tables, the ORACLE database can also create temporary tables. These temporary tables are used to save the data of a SESSION or the data required in a transaction.

Import/export from oracle (impdb + expdb) tutorial, impdbexpdbData Pump export: 0: su-oracle 1: sqlplus/nolog 2: connect/as sysdba 3: create directory data_dp as '/home/oracle/data_dp'; #/home/oracle/data_dp must exist (for oracle Users) 4: grant

Oracle Database startup and shutdown methods, oracle Database I. Oracle Database startup Methods (1) startup nomount Non-installation startup. In this mode, you can execute re-build the control file, re-build the database, and read the init. ora