oracle sql data modeler

Label:*sql optimization based on ORACLE11GR2 reading notes * Third, cursor in OracleThe cursor in Oracle is a vector of SQL parsing and execution in an Oracle database and is a data structure for C (Oracle is written in C). There

The ultimate goal of SQL optimization in Oracle database is to shorten the execution time of the target SQL statement. To achieve this, we usually have the following three ways to choose:1, reduce the resource consumption of the target SQL statement;2, parallel execution of the target

Oracle cold, stay at home and read the "Mastering Oracle SQL" 2nd, found that Oracle's function is still very strong, there are 200 optical functions, hsql is difficult to match. The next stubborn, it seems either to risk using Hibernate3.0 SQL mapping function, or to run the JDBC assembly VO. 1. Report Totals dedicate

to the base64binary type. The timestamp in Oracle is stored in a time format. Therefore, you cannot load SQL Server timestamp with the same dataset and have timestamp that loads Oracle. Because this value is rarely used in the application, you can not retrieve this field. Timestamp in Oracle cannot be automatically

This article is purely gossip and basically has no practical value. Oracle always uses SQL _ID to mark a unique SQL statement. SQL _ID corresponds to SQL _TEXT one by one. If the two SQL texts are different, including spaces and o

Microsoft Windows [version 6.1.7601] Copyright (c) Microsoft Corporation. All rights reserved. C:\users\ckz>sqlplus ZZJD/[EMAILNBSP;PROTECTED]/ORCL as SYSDBA; Sql*plus:release 11.2.0.1.0 Production on Wednesday May 17:00:46 2015Copyright (c) 1982, Oracle. All rights reserved. Connect to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-productionwith T

graphical tools for SQL optimization, it is always a good idea to write your own SQL tools to solve the problem:SELECT executions, disk_reads, Buffer_gets, ROUND ((buffer_gets-disk_reads)/buffer_gets,2) Hit_radio, ROUND (DISK_ reads/executions,2) Reads_per_run, sql_text from V$sqlarea WHERE executions>0 and buffer_gets > 0 and (buffer_gets-d Isk_reads)/buffer_gets An index is a conceptual part of a table u

Tags: Oracle data access other Oracle dataCreate a database link on your local Oracle databasesDROP DATABASE LINK Mydblink;Create DATABASE link Mydblink connect to zszq identified by "zszq" using ' 192.168.0.175:1521/ORCL '; sql> DROP DATABASE LINK mydblink; The database lin

Oracle data types, functions and stored procedures, and oracle Data TypesString typeFixed Length: char nchar n indicates Unicode encodingVariable Length: varchar2 nvarchar2Number Type: number (P, S) P: integer digits, S decimal placesIntegerBINARY_FLOAT Single Floating PointBINARY_DOUBLE Double Floating PointFLOAT (N)

Oracle|sql Language Oracle Pl/sql Language Foundation 2002-8-23 Oracle Pl/sql Language Basics Pl/sql is Oracle's extension of the standard database language,

: Release 10.1.0.2.0 - Production on Wed Mar 30 08:52:04 2005Copyright (c) 1982, 2004, Oracle. All rights reserved.Connected to:Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - 64bit ProductionWith the Partitioning, OLAP and Data Mining optionsSQL>select count(*) from t1; COUNT(*)---------- 9318 2. accidentally delete all recordsAnd submit the changes. S