oracle performance analyzer

Today we will mainly introduce how to optimize the database to greatly improve the performance of Oracle. Below we will introduce several simple steps to greatly improve the performance of Oracle, the image of Walmart is like the three axes of database optimization. The discussion of database optimization is an eternal

ORACLE Database Performance Optimization-) memory disk1. Memory Structure Optimization Overview 1.1 buffer zone Buffer zones that affect database performance include SGA that can be shared and pga that are private to server processes, sga also includes the Shared Pool, large pool, java pool, data buffer, stream pool, and redo log buffer.1.2 Automatic Memory Manag

I/O. Because indexes require additional storage space and processing, those unnecessary indexes can slow query response time. and the larger the table, the more serious the impact. The places to be aware of using indexes: 1. Avoid using not on the index column,We want to avoid using not on indexed columns, and not to have the same effect as using functions on indexed columns. When Oracle "encounters" not, he stops using the index instead of performin

Tags: database oracle performance databasesWhen SQL statements are executed, the Oracle optimizer determines how tables are accessed based on statistics, and generally, there are two basic ways to access data: 1) Full scan. In a full scan (full-table scan or fast full-index scan), multiple blocks are read into an IO operation. 2) Index Scan. Index scans first sca

likeSelect COUNT (*) from T_main where C4 like '%c% '; Memsql Sqlfire Oracle 41 875 133 Query Test three: Multi-table associated floating-point number sumSelect SUM (M.C1+R1.C1+R2.C1+R3.C1) "RT" from T_main M,t_rel1 r1,t_rel2 r2,t_rel3 R3 where m.rec_id=r1.main_id and m.rec_id =r2.main_id and m.rec_id=r3.main_id; Memsql Sqlfire

backup operation. 1, can achieve the Rman performance As mentioned in the Rman white Paper, the rate at which data can be backed up and recovered at tape is at 1TB per hour under current technical conditions. With the continuous development of tape backup technology, this rate is likely to become even greater. 2, the use of appropriate hardware If you want higher backup performance, the first considera

Oracle Performance Analysis 11: system statistics The overhead calculation of the early Oracle query optimizer was based on the physical reads required to execute SQL statements. This method is called the I/O overhead mode (I/O cost model ), the main disadvantage of this method is that the overhead of Single-block read and multi-block read is equivalent. In

Oracle Performance tuning is a broader and somewhat more complex topic, and the biggest problem for ordinary DBAs is where to start and what to do. All the information you know may be someone (a user) who reports a problem with the performance degradation of an application or query, and where do you start when faced with such a problem? Oracle's tuning approach

transaction, Oracle will recover the data to the State before the deletion (which is precisely the State before the deletion command is executed). When truncate is used, rollback segments no longer store any recoverable information. after the command is run, the data cannot be restored. therefore, few resources are called and the execution time is short. (The translator Press: truncate applies only to deleting the entire table, and truncate is DDL ra

pool accounts for about 8% and of the Size, it also includes the Java pool, large pool, and other SGA pools in addition to fixed areas, Buffer cache, and redo cache. In addition, there are some administrative information in this variable region. For example, the V $ System Dynamic Performance view that we often use is derived from the management information in this variable region (the V $ information comes from X $, the data in X $ comes from some s

); BEGINdbms_output.enable (1000000 ); FOR err_num IN 10000 .. 10999LOOPerr_msg: = SQLERRM (-err_num); IF err_msg not like '% message' | err_num |' not found % 'THENdbms_output.put_line (err_msg); end if; end loop; END; /On Unix systems, put the event information in a text file $ ORACLE_HOME/rdbms/mesg/oraus. msg you can use the following script to view event information event = 10000 while [$ event-ne 10999] doevent = 'expr $ event + 1' oerr ora $ eventdone for the/being tracked event, run the

Oracle is being studied. There are many reasons for the impact on Oracle performance, which can be divided into four aspects: 1. hardware environment CPU, memory, and network transmission conditions all affect Oracle performance. The hardware example will not be explained he

Oracle team helps to integrate enterprise systems and improve database performance Wu Chengyang, vice president of Oracle and General Manager of the Greater China technology product department, stressed that the integration of information systems is an important measure for enterprises to transition from the big data era. database construction should be consider

Test hardware Instructions: The test used is my love machine, configured as follows: cpu:c433 Memory: 128M Hard drive: Cool fish 2 generation 20G Test Software Description: WIN32 is under Windows NT Server4,sp5,apache 1.3.12,php3.0.15 and Php4rc1,mysql 3.22.29,oracle 8.0.5 Linux is Bluepoint linux1.0, Apache 1.3.12, Php4rc1,mysql 3.22.32 Test Code Description: Using a very simple table, MySQL and Oracle u

Oracledatabase, aka Oraclerdbms, or Oracle. is a relational database management system of Oracle Corporation. It is a leading product in the field of database. It can be said that Oracle database system is currently the world's popular relational database management system, System portability, easy to use, strong function, applicable to all kinds of large, medium