% Memory for SQL w/exec>1: 执行2次以上的SQL所占内存占总的SQL内存的比率,数据来源DBA_HIST_SQL_SUMMARY 的SINGLE_USE_SQL_MEM和TOTAL_SQL_MEM:1 – SINGLE_USE_SQL_MEM / TOTAL_SQL_MEM ==》上面2个指标也可以用来大致了解shared pool中的内存碎片程序,因为SINGLE_USE_SQL 单次执行的SQL多的话,那么...
This section provides an overview of bulk binds to help you decide whether to use them in your PL/SQL applications. For detailed information about using bulk binds, including ways to handle exceptions that occur in the middle of a bulk bind operation, seeOracle Database PL/SQL Language Referen...
SQL Macros - Creating parameterised views This tutorial explains how to create a parameterized view using SQL Macros. The examples use the built-in sales history schema so there are no setup steps. Script Simple Explain Plan This script explains the plan for a query of the sh.sales and sh....
An index is associated with a particular table and contains the data from one or more columns in the table. The basic SQL syntax for creating an index is shown in this example: CREATE INDEX emp_idx1 ON emp (ename, job); in which emp_idx1 is the name of the index, emp is the ...
- MySQL/MariaDB and Microsoft SQL Server migration. Ora2Pg does its best to automatically convert your Oracle database to PostgreSQL but there's still manual works to do. The Oracle specific PL/SQL code generated for functions, procedures, packages and triggers has to be reviewed to match ...
For very large tables, you can add the values to your table directly using SQL*Plus. You need to update each row in your table to include a context field value (the structure defining column) as well as segment values, so you must first determine the segment/column correspondences for your...
NoSQL refers to nonrelational types of databases that store data in a format that’s different from relational tables. NoSQL databases can be queried using idiomatic language APIs, declarative structured query languages, and query-by example languages.
For years now there's been a constant war between Microsoft supporters and Oracle supporters. Oracle has these features, SQL Server has these features, etc. But that's not really where the real importance lies. Sure, functionality is a part of it because your database should be able to do...
MySQL derives part of its name from the SQL language, which is used for managing and querying data in databases. MySQL offers full ACID transactions and can handle a high volume of concurrent connections. MySQL Explained MySQL is an open source RDBMS that uses SQL to create and manage database...
How does the Migration Workbench handle MS SQL Server 7.0 VARCHAR data types greater than 4000? The Migration Workbench converts any column that contains a VARCHAR field, with a length greater than 4000, to a CLOB column in Oracle. CLOB columns are a very efficient method of storing big text...