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Oracle_ sequence, index, synonym

smallColumns are not often used as join conditions or are present in the WHERE clauseData queried is greater than 2% to 4%Tables are often updatedNote: The index does not need to be used, just to say that we are querying with name. Speed will be faster. Of course, the speed of the check is fast, the insertion speed will be slow.Because the same time you insert data, you need to maintain an index.5. Querying the IndexAbility to view index information using the data dictionary view user_indexes a

Oracle synonym Synonyms

Synonyms in Oracle:Summary: In simple words, the tables of different users in Oracle are generally only available to their own users, and if you do not want to authorize other users to use them in an authorized way, then create the table with the table name in front ofSynonyms, which represents synonyms. In this way, a user-created table B can be used directly instead of a to grant B access to the table.Transferred from: Http://zhidao.baidu.com/link?url=BiYEkVVBEGI9Br7Ltph1lr81f8TQEJgA_q-Omz_wlX

Oracle synonym loop chain problem solution

Oracle synonym loop chain problem solution [SQL] 1. First check whether there is a loop synonym: select * from dba_synonyms where table_owner = 'test' and synonym_name

Confusion about synonym usage

When the company's production database is established, the user name used in the program is ABB, and all the tables belong to ABB. In this way, the permissions of ABB users are almost unlimited, he can drop any table. Another time a few days ago, the developer mistakenly dropped a table. According to the original plan, the database was changed last week (because the HDD logic was damaged) and upgraded to 10 Gb by the way. therefore, during the upgrade, all objects under the abb user are moved t

Oracle synonym surprises

Guide: SynonymIt is an alias for database solution objects and is often used to simplify object access and improve object access security. When using synonyms,Oracle DatabaseTranslate it into the name of the corresponding solution object. Similar to a view, synonyms do not occupy the actual storage space. Only the definition of synonyms is saved in the data dictionary. In Oracle databases, most database objects, such as tables, views, synonyms, sequences, stored procedures, functions, JAVA class

Create dblink and synonym in Oracle

The required information: Create a dblink from the MM Library to the GG Library The username and password of the MM library are mmn and mmk. The user name and password of the GG library are ggn and ggk. Prerequisites: The MM database has the permission to establish dblink, And the hosts on both sides can be pinged. Step 1: First, query the global_name of the two databases. Select * from global_name; For example, the MM database is MMDB, And the GG database is GGDB. Setp2: Create dblink -- Create

. Net pseudo-original code synonym replacement

After two days, I checked n more materials and finally made them. I put them in the background and sent them again.ArticleDirectly copy and paste the words in the article and replace them with my invincible 17000 synonym library. Here we use the ACCESS database, which is basically invisible to Baidu and Google, true pseudo-originality! Collect data tomorrow and replace it automatically after collection! Public String dealword (string CNT) // pseudo

View information under Oracle Current user (user, table view, index, tablespace, synonym, stored procedure function, constraints)

view_name from User_views;View the SELECT statement that created the viewSql>set view_name,text_length from User_views;Sql>set Long 2000; Description: The size of the set long can be set according to the Text_length value of the viewSql>select text from User_views where View_name=upper (' view_name ');6. SynonymsView the name of a synonymSql>select * from user_synonyms;SELECT * from all_sysnonyms;7. Constraint conditionsView constraints on a tableSql>select constraint_name, Constraint_type,sear

Database of Neusoft Internship (12)--sequence, index, synonym

in the index are deleted, and the data space occupied by the index is freed, but the data in the table still exists.Common index-related data dictionary views are: User_indexes: The definition of the user's Index object, containing the index's name and some related attributes of the index (such as uniqueness, etc.) User_ind_columns: The column definition information for the user Index object, which lists the index name, table name, and column name,

Oracle synonyms (synonym) __oracle

1. Why Use synonyms: Synonyms, as the name implies is two words, the same meaning, can replace each other. So what's its function? A one of the most obvious purposes is to simplify SQL. If a database object's name is too long, you can create a shorter synonym. It's the abbreviation. B. Another purpose is to hide the information of some objects. For example, to find a table in another schema, you need to prefix the table name with the schema name. If

Oracle Database Synonyms (SYNONYM), oraclesynonym

Oracle Database Synonyms (SYNONYM), oraclesynonym This tutorial uses examples to illustrate how to create and delete Synonyms (SYNONYM) in Oracle Data ). Concept Synonyms refer to database objects (tables, views, sequences, stored procedures, and other database objects) referenced by another name. For example: Creating a synonym can exclude the restriction of an

Synonyms for Oracle database (synonym) use

Tags: oracle synonyms synonym synonymsThis tutorial uses examples to illustrate how to create and delete synonyms (synonym) in Oracle data.ConceptSynonyms refer to database objects (database objects such as tables, views, sequences, stored procedures, and so on) that are referenced by another name. Like what:Creating a synonym can exclude the restriction of an ob

Oracle synonym creation and its role

Oracle 's synonym (synonyms) is literally understood as the meaning of an alias, similar to the function of an attempt, a mapping relationship. This article describes how to create synonym statements, delete synonyms, and view synonym statements. Oracle's synonym Summary: The literal understanding is the meaning of the

[Oracle] synonyms (synonym)

(i) the concept of synonyms Synonyms are aliases for tables, views, indexes, or other schema objects in a database, similar to views, where synonyms do not occupy the actual storage space, and only the definition of synonyms in the data dictionary. When you develop a database, you should avoid referencing tables, views, or other database objects directly, otherwise, when the structure of the table changes, it will affect the use of the application, this time need to recompile the program, if you

Baidu search R & D department: synonym Feedback Mechanism

1. Introduction Due to the limitations of the search algorithm itself, the user's semantic and intent understanding is not enough, and the click adjustment based on user behavior is used as a supplement to the traditional search algorithm, it plays an important role in search. Although user behavior has been proven to be effective in the search, it remains at the query-URL level or the Ngram-URL level [1] without in-depth feedback on the basic policies in the search algorithm, for example, synon

Oracle_ Advanced Features (3) Synonym and database link

Tags: ora authentication method Basic names Limited rect new spin privateFirst, synonym synonymConnect sys/123 as SYSDBA;SELECT * from EMP;ORA-00942: Table or view does not existCreate synonym emp for scott.emp;SELECT * from EMP; 1. DefinitionA synonym is an alias for a pattern object.Can be a table or view, sequence, PL/SQL program unit, user-defined object type

Oracle object (sequence, synonym, partition table, database link)

seen as an alias for an object, just like an alias for a command in the Liunx operating system. But the Linux command alias only provides the benefit of easy memory.1. In Oracle, synonyms can be used to:1) Simplify the SQL statements entered in Oracle, and by creating synonyms for objects, we can simplify complex SQL statements for easy memory and manipulation2) Hide the name and owner of the object, create synonyms for the object, such as the EMP table in Scott Mode (SCOTT,EMP), we create a

Lucene implements a custom Chinese synonym word breaker

----------------------------------------------------------Lucene participle _ Chinese participle introduction----------------------------------------------------------Paoding: Discovering word breaker. No updates have been madeMMSEG: Using Sogou's Thesaurus1. Import package (with two packages: 1. With DIC, 2. Without dic)If you use non-DIC, you have to specify the thesaurus location2. Create Mmseganalyzer (indicates where the thesaurus is located)-------------------------------------------------

Oracle synonym learning

Synonym: literally, it means an alias, which is similar to an attempt. Is a ing relationship. (1. Create a synonym statement: Create public synonym table_name for user. table_name; The first table_name and the second table_name can be different. In addition, to create a synonym for a table on a remote Database, you

ora-00980:synonym translation is no longer valid

The problem is that the synonym is invalid because it is queried by the table's synonym, and this table cannot be found, so the synonym is invalid.Analyze the reason, when we create synonyms, the system will not detect the existence of the original table. However, this error occurs when you manipulate the table with this synonym.Problem possibility:1. Whether the

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