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Java Web Development Knowledge Summary (Oracle-Programming) 1. PL/SQL: Oracle-specific 1.1 PL/SQL Overview PL/SQL (Procedure Language/SQL) is Oracle's procedural extension of SQL language. It refers to the addition of procedural statements (such as branches, loops, etc.) in the SQL command language, which makes the SQL language procedur ...

1. Background   MySQL 5.7 is the latest version of MySQL and has the following features compared to MySQL 5.6*Performance and scalability: Improve InnoDB scalability and temporary table performance for faster operations such as network and large data loading.   * JSON support: Using MySQL's JSON capabilities, you can combine ...

Oracle official note: javap Decomposition one or more class files. Brief description of use javap [options] classfile... options Command-line options, see Options later in detail classfile One or more Class files (separated by multiple spaces) can use file paths or files under classPath or enter URL s Description The javap command decom ...

oracle view the actual execution plan Occasionally, the execution plan that oracle sees is not a real one. To see if it is a real execution plan is to see if the SQL is actually executed. If it is not executed, then the execution plan may be inaccurate due to the direct error between statistics and practice, or for other reasons. 10046 capt ...

This article is from Li Mingzi's csdn blog( http://blog.csdn.net/free1985 For commercial reprints, please contact the blogger for authorization. For non-commercial reprints, please indicate the source. Abstract: this paper introduces the implementation of plsql-based code storage in the first root traversal tree with layer number. The code in ...

Write in front: The concept of one-way function: One-line function: Accept a data, output a data; Multi-line function: aggregate function, grouping function. Accept a set of data and output a data. Common character functions Case-related: LOWER, UPPER, INITCAP Others: TRIM, LTRIM, RTRIM, LPAD, PPAD, INSTR, SUBSTR, LENGTH, CONCAT, ...

demand As business grows, data volume becomes more and more complex, data volume becomes larger and larger, and requirements for database and server performance, high availability, disaster tolerance become higher and higher.Taking the current database environment as an example, the size of Windows 2008 r2 server + NAS storage + Oracle11.2.0.1+ ...

In database development, we often encounter row and column to row situations, there are many ways to achieve this function, such as using CASE...WHEN..., DECODE, or PIVOT and UNPIVOT. This article explains the use of PIVOT and UNPIVOT, and hope that readers can learn the use of row to column conversion. PIVOT Syntax SELECT ...    FROM .. ...

Modify the port SCAN listens on Modify the port SCAN listens on to 3521, and the port local listens on remains the same, at 1521: [root@web1 ~]# srvctl modify scan_listener -p 3521 1 View the listening status after modification: [grid@web2 ~]$ lsnrctl status LISTENER_SCAN1 LSNRCTL for Linux: Version 11.2.0.3.0 - Production on 06-May-2 ...

Now let's talk about the meaning of each parameter in the oracle execution plan Let's illustrate with an example below To add this, there are several types of trace s Sequence Number command explain 1 SET AUTOTRACE OFF This is the default value, which turns off Autotrace 2 SET AUTOTRACE ON EXPLAIN Show only execution plans 3 ...