Oracle

When there is a problem with the index, it can cause serious performance problems, such as index unavailability, index fragmentation, and performance degradation, and we need some means to detect problems with the index and address these issues.

A. Forget the login password for users other than SYS and system users.Log in with the SYS (or system) user.CONN Sys/pass_word as SYSDBA;Use the following statement to modify the user's password.ALTER USER user_name identified by Newpass;Note:

If the file is thousands of megabytes, or millions of megabytes, you will need to parallelize the backup of this file, usually, a channel can read only one file, but with a multi-segment keyword can change this behavior:Run {Allocate channel T1 type

The ROWID records the physical location of the data, and through ROWID you can know that the data is stored in the first few blocks of the data file.---------------------extended rowid format ----------------------------------------------------

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[email protected]>show parameter segmentNAME TYPE VALUE------------------------------------ ----------- ------------------------------Deferred_segment_creation Boolean TRUERollback_segments stringTransactions_per_rollback_segment Integer

Oracle uses 4 main functions of regular expressions:1. Regexp_like can only be used for conditional expressions, similar to like, but using regular expressions to match, the syntax is simple:2. Regexp_substr function, similar to SUBSTR, is used to

First, modify the Oracle session and the maximum number of connections1. View the maximum number of connectionsSql> Show parameter processes;NAME TYPE VALUE------------------------------------ -----------

1. View the table history moment dataSELECT * from Tab_test as of TIMESTAMP to_timestamp (' 20140917 10:00:00 ', ' yyyymmdd hh24:mi:ss ');2. Use Flashback table to restore the tables to a certain time in the pastALTER TABLE tab_test enable row

Where did all the time go? Blink of an eye as a. NET development has been more than eight download. Eight years of development career, countless days and nights, can technology accumulation how many? What about the depth of technology? In the

The database and the client are on different machines.Before installing, navigate to the following folder on the server where the Oracle database is installed.Change localhost in Listener.ora and Tnsnames.ora to the IP address of the machine, my 192.

Inventory Oracle Installation Tool OUI to manage the Oracle installation directory  Oracle's parameter file , starting after the parameter file is read in the following order, if the read fails, start the database failure:1 $ORACLE _home/dbs/spfile.

Materialized view of Http://www.cnblogs.com/Ronger/archive/2012/03/28/2420962.htmlOracleIn the near future, according to the project business needs to the Oracle materialized view has the contact, searches on the net on this aspect information,

The SQL used to write Oracle paging was: (1) SELECT *From (select A.*, RowNum rnumFrom (select ID, dataFrom T order by ID, ROWID) a)where Rnum >= 148 and rnumOr(2)SELECT *From (select A.*, RowNum rnumFrom (select ID, dataFrom T order by ID, ROWID)

In the partitioning table operation, when a partition already has the largest partition, how do you extend the partition again? The simple way is to delete the maximum partition first, then add the required partition and build the maximum partition

This section focuses on the use of indexes, first describes how to avoid using indexes in queries, then describes how the optimizer determines whether to use indexes, describes how to enforce the use of indexes, and finally introduces the parallel

Pl/SQL developer encoding format settings, pldeveloper When we use plsql, sometimes the encoding format of the database and plsql is incorrect, and we need to change the encoding format. The solution is as follows: Original article: http://blog.csdn.

Oracle control file multiplexing 1. Control File multiplexing 1. show parameter control-- View Control File InformationShow parameter spfile-- Check whether spfile exists.Create pfile from spfile;-- Generate pfileShutdown immediate-- Close the

Insert data into the database (ORACLE) through excel We all know that PL/SQL can copy data to excel, and we can also insert data to the database through excel. The following is a simple example and example. First, create a table named test.

Oracle modifies the ip address or host name and re-creates the em and listener Detailed operations for modifying the ip address and host name of an oracle DatabaseModify ip1. Modify the IP address of the host name in the hosts file.2. restart the