reverse index

Index | performance ORA FAQ Performance Tuning Series-- The Oracle (tm) Users ' co-operative FAQ Why would a reverse index to useful when the leading column of the "index is" generated from a sequence? When the first column of the index is generated

MySQL index details, MySQL index detailsI. Introduction to index basics 1.1 In MySQL, indexes are also called keys. They are a data structure that the storage engine uses to quickly find records. Indexes are critical to good performance. Especially

    I. Index Introduction 1.1 index creation Syntax: Create uniuqe | bitmap index . ON . (| ASC | DESC, | ASC | DESC ,...) TABLESPACE STORAGE LOGGING | NOLOGGING COMPUTE STATISTICS NOCOMPRESS | COMPRESS NOSORT | REVERSE PARTITION | global

A Index Introduction1.1 Creation syntax of the index:CREATE UNIUQE | BITMAP INDEX .On .( | ASC | DESC, | ASC | DESC,...)Tablespace STORAGE LOGGING | NologgingCOMPUTE STATISTICSnocompress | CompressNosort | REVERSEPARTITION | GLOBAL

We know that Oracle automatically indexes the primary key columns of the table, and this default index is the normal B-tree index. The default B-tree index is not ideal for situations in which primary key values are added sequentially (incremental

http://blog.csdn.net/tianlesoftware/article/details/5347098 A Index Introduction 1.1 Creation syntax for indexes: CREATE UNIUQE | BITMAP INDEX . On . ( | ASC | DESC, | ASC | DESC,...)Tablespace STORAGE LOGGING | NologgingCOMPUTE

First, the concept of the index Index is similar to look up a dictionary, through pinyin, strokes, only a few steps can find the word. Database, through the index, as long as a small amount of reading, you can find the required records.

Today is. I was planning to mix the direction key index and other indexes into other index logs, but I still feel that this part is too important. Record the arrow key index notes here. What is a direction key index? The direction key index is also

Oracle-specific index type resolution, oracle-index resolution2.1 B-tree index (default type)The B-tree index is a common index in Oracle. When creating an index, it is the default index type. The B-tree index can be a (simple) or composite

IndexAn index is an object in a relational database that is used to hold each record, and the main purpose is to speed up the reading speed and integrity checks of the data. Indexing is a highly technical and demanding task. Generally in the