bind variables

Replace variables and definition variables in SQL * Plus, and sqlplus Replace variable Replace variables in SQL * Plus are also called substitution variables. They are generally used to temporarily store relevant data and pass values between SQL

Why Does Oracle sometimes use indexes to search for data? A: When you use the SQL language to publish a query statement to the database, Oracle will generate an "Execution Plan", that is, the data search scheme through which the statement will be

Welcome to the Oracle community forum and interact with 2 million technical staff. Of course, we can also use the curosr_sharing parameter to enhance the applicability of the storage outline, but there is a limitation here, that is, the

Oracle X $ table naming conventions [plain] X $ table naming conventions [plain] [K] ernel Layer [2]-Phase Commit [G] lobal [T] ransaction [E] ntry X $ K2GTE-Current 2 PC tx X $ K2GTE2-Current 2 PC tx [C] ache Layer [B] uffer Management Buffer [H]

Welcome to the Oracle community forum and interact with 2 million technical staff to access the binding variables before 1.11g. We all know that in order to allow SQL statements to share the execution plan, oracle always emphasizes that when

Oracle string types: Oracle has four basic string types: CHAR, VARCHAR2, NCHAR, and NVARCHAR2. In Oracle, all strings are stored in the same format. The most comprehensive range of database blocks is 1 ~ The 3-byte length field is followed by the

Version11.2.1.0.25BLR19358139fix the following bug: 19358139 Version 11.2.1.0.25 BLR 19358139 fixed the following bug: 19358139-GoldenGate parsing multiple times. cache the prepare update statement to checkpoint table. 19358139 is bug no.: Bug 193581

1. Types of SQL parse SQL parse is usually divided into hard parsing and soft parsing. When SQL is executed for the first time, hard parsing will occur, and subsequent execution will be soft parsing if it can be found in the shared pool. Therefore,

In the oracle database, the correct use of the connection detection statement in the application is blog. csdn. netmsdnchinaarticledetails000013765 in many programs, connection detection (or connection detection) Statements use selectsysdatefromdual.

Analysis of effective cursor Management [Train of Thought Analysis] The cursor can be understood as a shared execution plan. When SQL is not shared, there are two common solutions: 1. Adjust the size of the Shared Pool (the shared execution plan

Oracle executes SQL statements to open, parse, execute, and close a cursor. After learning about the several phases of the cursor, we can figure out the SQL Execution Process. Oracle executes SQL statements to open, parse, execute, and close a

Oracle SQL * plus is a client tool that interacts with oracle. In SQL * plus, you can run the SQL * plus command and the SQL * plus statement. The DML, DDL, and DCL statements we usually call are SQL * plus statements. After they are executed, they

In SQL development, SQL query efficiency is a very important reference. Accidentally, your web server crashes because of a mysql query statement, it affects normal network access. In SQL development, SQL query efficiency is a very important

The following articles mainly introduce some useful suggestions for improving the execution efficiency of Oracle SQL. The following describes the specific solution and hopes to help you in your future studies. To improve the efficiency of Oracle SQL

Oracle multi-Table query optimization and Oracle Optimization ORACLE has a high-speed buffer concept. This high-speed buffer is used to store the executed SQL statements. Therefore, oracle has to do a lot of work when executing SQL statements, such

It encapsulates a PDO class. We hope that the CSDN experts will give you some advice on the shortcomings and encapsulate a PDO class. We hope that the CSDN experts will give you some advice on the shortcomings. Masters, comeon !? Php *** PDO

We know that the shared pool is an extremely important shared memory structure in the System Global Area and SGA. HoweverOracle DatabaseStore parsed and compiled SQL statements together with other content here. However, parsed SQL statements must be

Note: The following indicators are taken from the performance analysis indicators provided by the Oracle performance analysis tool Statspack.   Indicator Name Indicator description Indicator range Indicator Unit 1.

Recently, the project has been completed (maybe not enough), but a fatal obstacle is performance. Now let's think about how brilliant the TOP author is, and the performance is throughout. Recently, the project has been completed (maybe not enough),

How to use dynamic SQL in oracle development in general PL/SQL programming, SQL can be directly used in DML and transaction control statements, however, DDL statements and system control statements cannot be directly used in PL/SQL. To use DDL