programmatic synonym

index on the corresponding column after the PRIMARY KEY or UNIQUE constraint is defined Create manually : Users can create non-unique indexes on other columns to speed up the query To create an index on one or more columns CREATE INDEX Index on Table (column[, Column]...); To create an index on the column last_name of table employees CREATE INDEX on employees (last_name); Index created.②, query IndexYou can use the data dictionary view user_indexes and user_ind_columns to view the

Today we implement a simple word breaker, just do the demo using the following functions:1, the participle according to the space, the horizontal bar, the point number to divide;2, the implementation of HI and hello synonym query function;3, to achieve hi and hello synonym highlighting;Myanalyzer Implementation code:public class Myanalyzer extends Analyzer {private int analyzertype;public myanalyzer (int ty

Hit the synonym of the word forest, should be the product of the last century, the word is relatively old, but at least can also use synonyms of the role of the word forest, with the Word2vec to obtain similar function comparison, the two play a comparative effect, see the specific application bar1.First download the TXT,CSDN with synonyms on the link: http://download.csdn.net/download/answerme11/73077712.The contents of the TXT are as follows: each l

See a group of people asked the ordinary user access to the base table problem, the test is as follows:The x$ base table can be accessed by creating a view, and then creating a synonym, authorization, and access to the base table for ordinary users.Of course, ordinary users visit the base table is not reasonable, theoretically not necessary, permission control should also be disallowed. It is not considered reasonable here to experiment on this issue.

colleagues can query the data in the table, but when truncate this table hold ORA-00942: The table or view does not exist The beginning thought is the table name writes has the question, but later discovered that he deletes is not the table, but is a synonym (synonym) It is not possible to use truncat for synonyms synonym. Connected to Oracle Database 11g Ente

greater than 2% to 4%Table updated frequentlyIt is important to note that the creation of an index is also a certain amount of resources, 21 when using the index will speed up the query, the corresponding insertion speed is slow, because also to maintain the indexQuery Index: Use the data dictionary view user_indexs,user_ind_columns to view index informationSELECT Ic.index_name, Ic.column_name,Ic.column_position col_pos,ix.uniquenessFrom User_indexes IX, User_ind_columns ICWHERE Ic.index_name =

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

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

volume. 4. When should I create an index?Do not create an index in the following cases:The table is small.The column is not often used as a join condition or appears in the WHERE clause.The queried data is greater than 2% to 4%Frequently updated tables Note: indexes are not required, but the query speed is faster when name is used. Of course, the query speed is faster, and the insertion speed will be slow. Because an index must be maintained when data is inserted. 5. query IndexesYou can use th

[Oracle]-[synonym]-public and non-public synonyms [Symptom]: The Sys account creates a public synonym for the t_emp table of the bisal account. The bisal user can access t_emp_syn, but the scott account cannot query, select... t_emp_syn indicates that the table or view does not exist. SQL> select * from t_emp_syn; select * from t_emp_syn * ERROR at line 1: ORA-00942: table or view does not exist [cause]: Sc

Data Type Synonym Includes data type synonyms for compatibility with SQL-92. Synonym Ing to System Data Type Binary varying Varbinary Char varying Varchar Character Char Character Char (1) Character (N) Char (N) Character varying (N) Varchar (N) Dec Decimal Doubl

Oracle reported that DBLink synonym calling during Stored Procedure error: PLS-00201: must declare identifier, dblinkpls-00201 A stored procedure needs to be written a few days ago to access the field of the remote database, so a dbLink is created and a synonym is created: Create public database link orcl @ dbc connect to orcl identified by orcl USING 'orcl '; create