In the help of imp: SHOWjustlistfilecontents (N), the default value is N.
In the help of imp: SHOW just list file contents (N). The default value is N.
In the help of imp: SHOW just list file contents (N). The default value is N.
The code is as follows:
In the help of imp: SHOW just list file contents (N). The default value is N.The following experiment explains two points:1. show = y: displays the statements for creating objects in the dmp file.2. show = y, as orac
. Create an index on one or more columns
Create index indexname on table (column [, column]...);
Ii. Create an index on LAST_NAME In the EMPLOYEES column of the table
Create index emp_last_name_idx on employees (last _ name );
Index create.
D) index creation period
I. index creation
1. Wide data distribution in Columns
2. Columns often appear in the where clause or join condition.
3. Tables are frequently accessed with a large amount of data. The amount of data accessed is about 2% to 4% of the
Drop Index;
Ii. Delete the index upper_last_name_idx
Drop index upper_last_name_idx;
Iii. Only the index owner or users with the drop any index permission can delete the index.
2. Synonyms
A) advantages of using Indexes
I. convenient access to other user objects
Ii. Shorten the Object Name Length
Iii. Create [public] synonym Synonym
III. For object;
B) Create a
, roles, tablespaces, tables, views, clusters, types, synonyms, sequences, indexes, database links, stored procedures, functions, packages, and triggers. C. Oracle combines these database objects into a collection called Schema. A Schema can only be owned by one data user, and its name is the same as that of the user.
14. TableIn Oracle, the table concept and syntax for creating, deleting, and modifying tables are basically the same as those in other databases. Common Data Types of Oracle tables
WordNet Research 2 -- Introduction
Structure
The main relation among words in WordNet is synonymy, as between the words shut and close or car and automobile. synonyms -- words that denote the same concept and are interchangeable in your contexts -- are grouped into unordered sets (synsets ). each of WordNet's 117 000 synsets is linked to other synsets by means of a small number of "Conceptual relations. "Additionally, a synset contains a brief definition (" gloss ") and, in most cases, on
, Oracle only provides high-speed buffer (Cache buffering) for simple tables. This function is not applicable to multi-table join queries.
The database administrator must set appropriate parameters for this region in init. ora. When the memory area is larger, more statements can be reserved. Of course, the possibility of sharing is higher.
When you submit an SQL statement to Oracle, Oracle will first find the same statement in the memory.
It should be noted that Oracle adopts a strict match betw
database name. The database global name can be identified with the following command--select * from Global_name;
3, query data:
Querying, deleting, and inserting data is the same as manipulating a local database, except that the table name needs to be written as a "table name @dblink server."Select xxx from table name @ database link name;
4, delete Dblink
Drop/* Public */Database link dblink1;
5. Create and delete synonyms
Create or replace synonym
SQL statement to Oracle, Oracle first looks for the same statement in this block of memory.What needs to be noted here is that Oracle is a strict match between the two, and to achieve sharing, the SQL statement mustExactly the same (including spaces, line wraps, etc.).
The shared statement must meet three criteria:A. Character-level comparisons:The statement that is currently executed and the statements in the shared pool must be identical.For example:
SELECT * from EMP;
is different from
the shared pool must be identical.
For example:
SELECT * from EMP;
is different from each of the following
SELECT * from EMP;
Select * from EMP;
SELECT * from EMP;
The objects referred to in B. Two statements must be exactly the same:
For example:
How user object names are accessed
Jack sal_limit private synonym.
work_city public synonym
Plant_detail public
Tags: flashback synonym shutdown Lin ODBC data source HBA using open computerCommon exceptions:ORA-14025: Cannot specify partition for a solid view or a solid view logOra-14026:partition and cluster clauses repel each otherORA-14027: Only one partition clause can be specifiedORA-14028: Missing at or values keywordsOra-14029:global partition index must be prefixedThere are non-existent partition columns in the ora-14030:createtable statementORA-14031:
the permissions of the database server settings ALTER TABLE modify the owning table permission alter TABLESPACE repair Change the permissions of the tablespace alter user to modify the permissions of the users analyze use the Analyze command to parse any tables, indexes, and clusters in the database audit any set audit options for any database object audit system allows systems to operate audit backup any T Able the right to back up any table become user to toggle the permissions of the users s
Konglin; (includes alter procedure, drop procedure and function, and package permissions)
Permissions granted to the user action sequence:
Grant create sequence to Konglin; (includes creation, modification, deletion, and selection sequence)
To grant a user fallback segment permission:
Grant Create rollback segment to Konglin; Grant alter rollback segment to Konglin; Grant drop rollback segment to Konglin;
To grant a user
;
Step three: Delete the viewDrop View vw_eds;
Knowledge Point Six: alias of synonym (synonym) object table Syntax: Create synonym synonym name for table name Category: Public-authorized users can use, private-create user can use
Issue 1: Create a private
Tags: oracle plsql database synonym sequenceThe synonyms and sequences for the basic introduction to PL/SQL PL/sql: Process language (Procedure Language) and structured language (structured Query Language)The combination of the programming language, is theSQLextensions that support multiple data types, such as large objects and collection types, can use control statements such as conditions and loops to create stored procedures, packages, triggers, an
the path of the above file 3, close the Oracle service: Shutdown immediate;4, copy all backup files 5, restart the service startup;2. Other objects of the databaseSynonym (exclusive function of Oracle) synonym definition: If the SYS user, go to use SELECT * from EMP, the syntax to query the EMP table, he will report the table or the view does not exist, because the EMP table belongs to the Scott user, Therefore, if you need to access the table under
Tags: oracle note Li Xinghua
Disable the user login password
user Scott Current login password is invalid, note requires DBA users to operateSql>alter USER Scott PASSWORD EXPIRE;Description: After the above statement operation,when the Scott user logs back in, the database prompts for a new login password
Synonyms
1 . Synonyms are an alias for database schema objects and are often used to simplify object access and improve the security of object access. When using s
public class Cyclicbarriertest {public static void main (string[] args) {Executorservice service = Executors.newcache
Dthreadpool ();
Final Cyclicbarrier cb = new Cyclicbarrier (3); for (int i=0;i
The results of the operation are as follows:
The thread pool-1-thread-3 is about to arrive at the rendezvous point 1, currently 1 have arrived and are waiting forThe thread pool-1-thread-1 is about to arrive
Lucene implements index creation and retrieval; Ikanalyzer realizes the Chinese word segmentation, the light has been able to achieve the Chinese search, but the light is not enough, many projects in the search, should also be able to deal with synonyms, such as the index library has "computer", "computer" such as the entry, search "Notebook" should also be able to "computer", "computer" such an entry to match, which involves the index of the synonym
synonym for ease of use:Create synonym worker_syn FOR worker @ zrhs_link;You can also create a local remote view for ease of use:Create view worker as select * FROM worker @ zrhs_link where... ;Now this view can be treated like any other view in the local database, and can be authorized to other users to access this view, but this user must have the permission to access the database link.In another case, t
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