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The cost-based optimizer (CBO) occasionally makes some wrong choices when making a full table scan, especially in Oracle7 and Oracle8. There are several situations that can cause this problem, as follows: The highest use mark (high water mark) is

First, the concept Tablespace: is a logical collection of one or more data files Table Space Logical Storage objects: Permanent segment--> such as tables and indexes Temporary segment--> such as temporary table data and sorted segments Rollback

A pen to write thousands of words, writing no words! This is a frequently encountered situation as a website optimizer. Because I've been in a situation like this, here I would like to tell you a little trick, is that when you do not know what to

1, the creation of Excel forms, require a table in more than one table has text, and text with pinyin. 2. Refer to "How to annotate the text in Excel form (same form)" This experience adds pinyin to the text in the table. 3, for the