Oracle

Be particularly careful about issues that are not easy to notice when converting Oracle queries to SQL Server. T-SQL, as we know, is the language engine of Plsql, and Oracle's language engine is. Both of these query languages extend the ANSI SQL-92

Bitmap indexing is an anomaly in the Oralce database index, which has outstanding performance in some special occasions. In general, the effect of a bitmap index is directly related to the cardinality of the column. For this reason, when it comes to

In Oracle's latest version of 10g R2, the most timely technology should be transparent data encryption technology (transparent data encryption,tde). TDE is used to encrypt data, usually the application logic executed by SQL does not need to be

10.1 Parallel Recovery (v7.1) The goal of parallel recovery is to reduce the time for crash recovery, single instance recovery, and media recovery with parallel mechanisms for computing and I/O. Recovery time can be effectively reduced when

Oracle uses regular expressions without these 4 functions: 1. Regexp_like 2. Regexp_substr 3. Regexp_instr 4. Regexp_replace Look at the function name and guess what's the use. Regexp_like can only be used for conditional expressions, similar

A cursor is a data extracted from a datasheet, stored as a temporary table in memory, with a data pointer in the cursor, a first record in the initial state, a fetch statement to move the pointer, a variety of operations on the data in the cursor,

oracle| Source Code People who have used JDBC even ORACLE will know the fact that we need the library file Classes12.zip exists in the $oracle_home/jdbc/lib directory (but there are still some rookie often in the forum to seek this library files,

oracle| Data | database "Summary" HP provides 2 major class APIs (application interfaces) to operate Oracle databases. One is the standard Oracle processing function (ORA) and the other is the Oracle 8 call interface function (OCI8). The latter can

oracle| problem everyone in the application of Oracle may encounter a lot of seemingly difficult problems, especially for beginners, today I simply summed it up, released to everyone, hope to help everyone! And we discuss together, progress together!

Oracle's classic Oracle books: Oracle High performance tuning for 9i and 10g by Gavin Powell Book Description There are three parts to tuning a Oracle database:data modeling, SQL code tuning and physical database configuration. A data Model

oracle| Data | database Platform: SunOS 5.8 generic_108528-23 sun4u SPARC sunw,ultra-enterpriseDatabase: 8.1.5.0.0Symptom: Slow response, application request cannot returnLog in to the database and find that the Redo journal group is active except

Oracle SQL Tuning Oracle's SQL tuning is a complex topic, and even a whole book is needed to introduce the nuances of Oracle SQL tuning. But there are some basic rules that every Oracle DBA needs to follow, and these rules can improve the

oracle| Data | database String connectionstring= "user Id=ordtrc;pwd=ordtrc;data source=\" frame2db\ ";p ersist security info=false;"; /write Connection stringOracleConnection conn=new OracleConnection (ConnectionString);//Create a new

oracle| Data | database | database connection using System; Using System.Data; Using System.Data.OracleClient; Class Sample { public static void Main () { String myConnString = "User Id=zk;data source=zkqx;password=*****"; OracleConnection

Statspack 10 items that must be viewed in the output result 1, load between files (load profile) 2, instance efficiency click Rate (Instance efficiency hit ratios) 3, the first 5 waiting events (Top 5) 4, Waiting for events (wait event) 5.

Ordered prompts to force Oracle to join tables in the order in which they appear in the FROM clause. By ordered hints, you can avoid table connection evaluations during the CBO SQL parsing process, thus avoiding Oracle generating incorrect

Oracle Text is a powerful search technology that is built into all versions of the Oracle database, including free available version (XE). It provides a development API that makes it easy for software developers to implement full-featured content

For ordinary sample statements, the results that Oracle returns each time are not fixed: Sql> SELECT object_id from T SAMPLE (0.01); object_id ---------- 35199 Execution plan ---------------------------------------------------------- Plan

First, unpack the cluster kit; Gunzip 10201_clusterware_linux_x86_64.gz CPIO-IDMV The place where the decompression is placed requires the permission of the Oracle user Second, start installing the Oracle RAC Cluster Kit, 2.2.1. Shut down the

If the backup is not recoverable, then it is useless. RMAN provides a way to check database restore capabilities without having to restore the database, and provides several check options for the user. 1. Restore Preview command This command lets