oracle grant create database link example

Label:Creating a Create script for an existing job in an Oracle database --generate a Create script for an existing job Create or Replace procedureProc_generate_job_create_sql is beginDbms_output. ENABLE (Buffer_size= NULL);--indicates that the output buffer is unrestr

Tags: rds pen technology STS Max nbsp Vertica fetch styleExecute_query command is used-fetch all the records for current database data block in Oracle Forms, actually its EXECU TES query in the current data block. SyntaxExecute_query;Clears the current block, opens a query, and fetches a number of selected records.execute_query (Keyword_one VARCHAR2);Execute_query (All_records) performs the same actions as

separately in the WHERE clause, it is decomposed into multiple single-field indexes; D, if the composite index contains more than 3 fields, then carefully consider its necessity, consider reducing the composite field; E, if the existing single-field index, and the number of composite indexes on these fields, you can generally delete the composite index; 8, frequent data operation of the table, do not set too many indexes; 9. Delete useless indexes and avoid negative impact on execution plan; Th

(sysdate + 1) + (8*60+30)/(24*60) ' Every Tuesday noon 12 o'clock: ' Next_day (TRUNC (sysdate), ' Tuesday ') + 12/24 ' on the first day of the Month 12 o'clock Midnight: ' TRUNC (Last_day (sysdate) + 1) ' The last day of the quarter 11 o'clock: ' TRUNC (add_months (sysdate + 2/24, 3), ' Q ') -1/24 ' every Saturday and Sunday 6:10 A.M.: ' TRUNC (LEAST (Next_day (sysdate, ' SATURDAY '), Next_day ( Sysdate, "SUNDAY"))) + (6X60+10)/(24x60) ' per minute execution: ' TRUNC (sysdate, ' mi ') + 1/(24*6

the composite index contains more than 3 fields, then carefully consider its necessity, consider reducing the composite field;E, if the existing single-field index, and the number of composite indexes on these fields, you can generally delete the composite index;8, frequent data operation of the table, do not set too many indexes;9. Delete useless indexes and avoid negative impact on execution plan;These are some common criteria for establishing an index. Word, the establishment of the index mu

When designing a database table, it was found that Oracle did not have a set of self-adding primary keys, and Google learned that Oracle itself does not support the Sequence key, which needs to be implemented through sequences (Trigger) and triggers.CREATE TABLE Student Create Table Student ( ID number () pri

Label:One, at the time of installation, the parameters are a bit different: Python setup.py Build Install Second, connect to the database, there are two ways, DSN and TNSNames way: # DSN = Orcl.makedsn (Self.oracle_host, Self.oracle_port, Self.oracle_sid) #con = orcl.connect (self.oracle_username, Self.oracle_password, DSN) con = Orcl.connect (self.oracle_username,self.oracle_password,self.oracle_alarm_ciname) = con.cursor () " Select '%s ' from