create index

And then, in the previous example, set up two indexes on the table: Sql> CREATE INDEX Ind_t_owner on T (OWNER); The index has been created. Sql> CREATE INDEX ind_t_id on T (object_id); The index has been created. For full table scans, use the

Full-text search 0, written in front of this paper is mainly about the Windows2000 Server environment, exchange Server and SharePoint Portal Server-search function of the application, at the same time, to some of the SQL Server under the concept. In

CREATE TABLE T0 ( Sid int NOT NULL, Sname VARCHAR2 (20) ) Tablespace test; --Loop Import data Declare MAXRECORDS constant int:=100000; I int: = 1; Begin For I in 1..maxrecords loop Insert into t0 values (i, ' Ocpyang ' | | i); End Loop;

MySQL Getting Started guide, hope for everybody use!! First, SQL crash Here are some important SQL quick references, for SQL syntax and added features on standard SQL, please check the MySQL manual. 1. Create a table A table is one of the most

The SQL Server itself is made up of client-side, with syntax parsing and simple database operation (no database APIs using MFC). The interface uses the Cj60lib class library, and the syntax display uses the Crystaledit class. Login account:

Reference | Reference Manual | Chinese InnoDB chinese Reference Manual---canine (heart-sail) InnoDB table is limited to the CREATE TABLE T (a CHAR (a), B INT, INDEX T_ind (A (5)) TYPE = InnoDB; InnoDB will inherently create an index on the entire

Oracle Several deficiencies in oracle9i compared with Sybase ASE12.5 Thousands of Dreams 2004-7-24 Oracle9i and ASE12.5, respectively, are the world's leading database manufacturers Oracle, Sybase Company's flagship products,

This article is a MySQL table and index usage specification for a detailed analysis of the introduction, the need for friends to reference the One, MySQL build table, the field needs to be set to Non-empty, you need to set the field default value.

In an optimized query, database applications (such as MySQL) mean the operation and use of tools. The purpose of optimizing queries is to use indexes, analyze queries using explain, and adjust the internal configuration of MySQL. Any database

The has recently captured some column SQL statements in the production library ADDM, most of which can be done through index optimizations, but the following SQL statement is very difficult. Through the index optimization effect has been not ideal,

oracle| Tips 1. Find Useless index: 　　 DML performance is low, one of the most serious reasons is the existence of useless indexes. All SQL inserts, updates, and deletions become slower when they need to modify a large number of indexes when each

Today, Oracle databases are favored by more and more enterprises because of their high reliability, security and compatibility. The reader may wish to consider some of the following aspects of how to keep the Oracle database permanently in good

Oracle First chapter: Log Management 1.forcing Log Switches sql> alter system switch logfile; 2.forcing checkpoints Sql> alter system checkpoint; 3.adding Online Redo Log groups sql> ALTER DATABASE Add logfile [Group 4] Sql> ('/disk3/log4a.rdo ', '

Package com.jadyer.lucene; Import Java.io.File; Import java.io.IOException; Import Org.apache.lucene.analysis.standard.StandardAnalyzer; Import org.apache.lucene.document.Document; Import Org.apache.lucene.document.Field; Import

Looking at the optimized document, it is found that the hint of the specified index can also be column-style. In 9i and previous versions, the index hint format is/*+ index (table_alias) * * * or/*+ index (table_alias index_name) * *, but in 10g it

Nonclustered indexes have the same B-tree structure as clustered indexes, and the significant difference between them is the following two points: The data rows of the underlying table are not sorted and stored in the order of the nonclustered keys.

mysql| Reference | reference Manual | chinese MySQL Chinese reference manual (catalog) Reprinted translator: Yan Zi return 〗〖 Forwarding Translator: Yan Zi (clyan@sohu.com) Homepage: http://linuxdb.yeah.net 0 Translator Preface 1 General

Normally, Oracle automatically frees up temporary segment A when it completes a sort operation that uses the temp table space, such as a SELECT statement, create INDEX, and so on. But some of us will encounter the temporary segment has not been

If we create a testindex table:CREATE TABLE Testindex (i_testid INT not null,vc_name VARCHAR () not NULL); We randomly inserted 1000 records into it, one of whichI_testid Vc_name555 ErquanLooking for records for vc_name= "Erquan"SELECT * from

I've often seen people ask this question, I've set up multiple indexes on the same table, why does Oracle choose one at a time and not use multiple indexes at the same time? Generally speaking, the common access to the same table more than two