oracle sql performance analyzer

the SGA. The number of buffer cached in the storage area in the parameter DB-BLOCK-BUFFERSSGA), the number of bytes allocated to the shared SQL area by the parameter SHARED-POOL-SIZE), is the primary influence of the SGA SIZE. DB-BLOCK-BUFFERS parameters are the most important factors determining SGA size and database performance. A high value can increase the system hit rate and reduce I/O. The size of ea

analyze the obtained SQL to see if its execution plan is indexed, optimize it to avoid full table scanning to reduce Io waits, to speed up statement execution.Tip: I often encounter an in statement when optimizing SQL statements. At this time, we must replace it with exists, because Oracle processes in by or, even if an index is used, it will be slow.For example

actually specified as the sqlid of the statement) --Generates an AWR report of an SQL statement, runs the script Awrsqrpt.sql Awrsqrpi.sql: Generates a statistical report of the specified SQL statement for the specified DB instance, specifying the snapshot interval; Awrddrpt.sql: Specify two different time periods, generate a statistical comparison report of the two periods; Awrddrpi.sql: Speci

We have to do not only write SQL, but also to write a good performance of SQL, the following is the author of learning, excerpts, and summary of the departmentShare the information with you! Select the most efficient table name order (valid only in the rule-based optimizer) The parser for ORACLE p

SQL _no_cache count (*) fromXxx "to use no cache in SQL statements SQL statement optimization tool SQL tuning Lecco SQL exper Lecco SQL expert artificial intelligence automatic SQL Op

number of visits to the database: Oracle has performed a lot of work internally: parsing SQL statements, estimating the index utilization, binding variables, and reading data blocks. (5) re-set the arraysize parameter in SQL * Plus, SQL * forms, and Pro * C to increase the retrieval data volume for each database acc

First, the question of the proposedIn the early stage of application system development, due to less development database data, the query SQL statement, complex view of the writing of the performance of the SQL statement is not good or bad, but if the application system submitted to the actual application, as the data in the database increases, The response speed

Oracle DBA manual-database diagnosis cases and performance optimization practices (planned by guobiao) Pricing: ￥59.80 Member price: ￥44.85 (off) Example of this book free trial: http://www.china-pub.com/196286 [Basic Information]Author: Editorial Board of Oracle DBA ManualPress: Electronic Industry PressISBN: 9787121101397Mounting time:Published on: February 1,

devices in the income system. If these parameters are not adjusted, system resources will be greatly wasted. In terms of Alpha 1200 of the revenue system, the size of SGA is about 160 MB. Some parameters in the initialization parameter file have a decisive influence on the size of the SGA. Parameter DB-BLOCK-BUFFERS (number of buffer cached in the storage area in SGA), parameter shared-pool-size (allocated to the number of bytes in the shared SQL are

, the problem is not very big. But for large data tables, deleting data with delete can have a certain effect on the performance of the stored procedure. Because delete takes a full table-by-scan approach, it is a transactional operation that is counted into the SQL Server transaction log. Not only increases the running time, but also writes log files frequently, which causes the log file to be too large an

Oracle| Notes | performance Oracle Performance Diagnostics-Learning Statspack Notes (ii) [Overview] Author: Liu Yingbo Time: 2004-3-3 Mail:liuyingbo@126.com, please correct me. Reprint please indicate the source and the author Oracle

implemented more or less in stored procedures. For a small number of tables, the problem is not very big. But for large data tables, deleting data with delete can have a certain effect on the performance of the stored procedure. Because delete takes a full table-by-scan approach, it is a transactional operation that is counted into the SQL Server transaction log. Not only increases the running time, but al

Recently, due to work needs, I hope to make a comprehensive summary of the considerations related to SQL Server database performance optimization. After searching online, I found manyArticleSome of them list hundreds of entries, but you can see that there are a lot of seemingly incorrect or outdated information (which may be applicable to versions earlier than SQL