oracle performance tuning pdf

Tags: mysql, mariadb1. Performance1) Performance improvementMySQL5.7 provides more consistent linear performance and scalability on systems that support multi-processor and highly concurrent CPU threads. The key to achieving this is to eliminate InnoDB kernel contention and mutex locking through the concurrency of the efficiency of the Oracle InnoDB storage engin

performance, and to control their sum within the value specified by the Sga_target. Once you assign a value to Sga_target (the default is 0, that is, ASMM is not started), the ASMM feature is started automatically.iii. Oracle Memory tuning approachWhen a performance problem arises in the production environment of a pr

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 im

Performance Tuningcorporation, a consulting firm focused on database performance, management, virtualization, and disaster recovery solutions. Prior to founding Performancetuning, he worked as an operating system developer at Compaq Computercorporation and then as a database performance engineer. He has extensive experience in database system design and * *

be sorted, or it can be added to a column (like joins or additions). Any non-indexed item in the ORDER BY statement, or a computed expression, will slow down the query. Double-check the order BY statement to find non-indexed items or expressions that degrade performance. The solution to this problem is to rewrite the order BY statement to use the index, or you can establish another index for the column you are using, and you should absolutely avoid u

1m-2m size, and then set it individually on demand in each session. 4, Read_rnd_buffer_size For sorting and order by operations, it is best to set it to 1M and then set it as a session variable to a larger value in the session. (v) Slow query log A slow query log is a useful feature of MySQL. 1, Log_slow_queries MySQL parameter in the log_slow_queries parameter set it in the My.cnf file, set it to on, by default, MySQL will put the file into the data directory, the file is named "Hostname-slow.

SQL Optimization Oracle SQL optimization is a complex topic, and even requires the entire book to introduce the nuances of Oracle SQL optimization. However, there are some basic rules that every Oracle DBA must follow. These rules can improve the performance of their systems. The goal of SQL optimization is simple: . E

The SQL Tuning toolset (SQL Tuning set,sts) is an integral part of the Oracle 10g SQL Tuning Advisor feature. Each tuning toolset contains one or several SQL statements, as well as the contextual information needed to properly interpret them. SQL

Preface In the past decade, Oracle has become one of the world's most professional databases. For IT experts, it is to ensure that their company's productivity is improved by leveraging the powerful features of oracle. One of the most effective methods is to use ORACLE optimization. It has a lot of parameters and technologies to improve the

In the past decade,OracleIt has become one of the most professional databases in the world. For IT experts, IT is to ensure that their company's productivity is improved by leveraging the powerful features of Oracle. One of the most effective methods isOracle Optimization. It has a lot of parameters and technologies to improve the performance of your Oracle datab

When Oracle database performance problems occur, it is effort-saving to use the Oracle toolkit and give reasonable optimization suggestions. The following two packages are described and their specific practices. The smallest adjustment tool for SQL Tuning Advisor. Use one or more SQL statements as the input content, an

Oracle 11g has made some improvements in optimization. Oracle automates the following optimization: Redo Logfile Sizing Advisor-this feature recommends Redo the optimal size of log files to avoid excessive disk I/O caused by frequent checkpoints. Automatic Checkpoint Tuning-Oracle database can now optimize checkp

, please look down. First, ask yourself how big the difference is between "Empty" and "null" (if it's int, that's 0 and null)? If you feel that there is no difference between them, then you should not use NULL. (Do you know?) In Oracle, NULL and Empty strings are the same! Do not assume that NULL does not require space, that it requires additional space, and that your program will be more complex when you compare it. Of course, this is not to say that

# The number of worker_processes should be no more than the number of cores of the server's CPU, # Each CPU core of more than 1 worker does not make nginx performance has any promotion worker_processes 4; # The number of file descriptors used for Nginx. This needs to be set up system kernel parameter ' ulimit-n 200000 ' or modify '/etc/security/limits.conf ', reference "High load Linux tuning" Worker_rlimit

no hidden danger of even slight performance degradation.2.2 ExampleIn the previous section, if Shmmax and sga,oracle create multiple shared memory segments, we can use IPCS-SA to see the number of shared memory segments.(1) View[Email protected] ~]# cat/etc/sysctl.conf | grep Kernel.shmmaxKernel.shmmax = 20971520[Email protected] ~]# Ipcs-sa------Shared Memory Segments--------Key shmid owner perms bytes na

!) Unusual situations. Oracle database administrators responsible for database backup and recovery operations. Directory1. introduction 2. jump-Starting RMAN 3. using the Flash Recovery Area 4. using the RMAN Client 5. locking ing the RMANEnvironment 6. using the Recovery Catalog 7. backing up with RMAN 8. maintaining RMAN 9. scripting RMAN 10. restoring the Controlfile 11. discovery Complete Recovery 12. discovery Ming Incomplete Recovery 13. ming

Tags: Oracle--oracle Full-text indexing with Case study tuningFull-Text Search (Oracle text)Oracle text enables oracle9i to have powerful text retrieval capabilities and intelligent text management capabilities, Oracle text is a new name used by Oracle9i, known in oracle8/8i

performance analysis and tuning. Background knowledge Main methods of performance analysis Monitoring: Monitoring is a common way to view the run-time behavior of an application. There are often multiple views (view) that display CPU usage, memory usage, thread state, and other useful information in real time, so that users can quickly discover the key to the

parsing function anatomy 8.4 Function List 8.5 aggregate functions 8.5.1 aggregate functions that span the entire partition 8.5.2 Fine-grained window declarations 8 .5.3 Default window declares 8.6 lead and Lag 8.6.1 syntax and sort 8.6.2 Example 1: Returns a value from the previous row 8.6.3 Understanding the displacement of the data row 8.6.4 Example 2: Returns a value from the next row 8.7 fi　Rst_value and Last_value 8.7.1 Example: Use First_value to calculate the maximum value

Label:MySQL is a powerful open source relational database management system (RDBMS). It was posted on 1995 (20 ago). It uses Structured Query Language (SQL), which may be the most popular choice in database content management. The latest MySQL version is 5.6.25, released on May 29, 2015. An interesting fact about MySQL is that its name comes from the daughter "My" of Michael Widenius (the founder of MySQL). Although there are many interesting rumors about MySQL, this article is mainly to show yo