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each time. --Reduce the frequency of full GC (Minor GC maximization principle)B. When dealing with throughput and latency issues, the larger the amount of memory the garbage processor can use, the greater the Java heap memory, the better the garbage collection, and the smoother the application runs.C. Select two of the three performance attributes (throughput, latency, memory footprint) for JVM garbage collector
Label:The main steps used by SQL Tunning Advisor: 1 Setting up Tunning task 2 Execute Task 3 showing tunning results 4 Follow the recommendations to run the corresponding tuning methodHere's how to do it in this order: 1 Setting up test tables and indexes Sql> CREATE TABLE test_sql_advisor as SELECT owner,object_name,o
Tags: upd alt has meaning tab logic for good problem useObjective In the previous article we analyzed the role of statistical information in the database, and we have learned how the database uses statistics to control the distribution of the contents of tables in the database. Children's shoes are not clear and can be clicked for reference. As a tuning series of articles, the index of the database is certainly not less, so this article we began to an
Document directory Preliminary steps Using bind variables There are several relatively easy steps you can take to improve performance. From the user's perspective, one of the most frequently used interfaces with a database involves SQL statements, so getting a handle on them is a good pl
ObjectiveIn the previous article we analyzed the role of statistical information in the database, and we have learned how the database uses statistics to control the distribution of the contents of tables in the database. Children's shoes are not clear and can be clicked for reference.As a tuning series of articles, the index of the database is certainly not less, so this article we began to analyze this piece of content, about the basic knowledge of
Introduction Do you need to analyze in detail some key performance factors that enable you to control and tune DB2 and DB2 applications? Do you want to diagnose performance and availability issues in advance? Or have you ever encountered a problem when using the DB2 server, but you cannot use the current snapshot to determine the cause of the problem, so you want to use historical monitoring data? IBM DB2
PrefaceThis article continues to explain how to tune the concepts that are relevant to performance optimization in the previous chapter. Code optimization is the most common of us, but there are also software architectures, JVM virtual machine tiers, databases, and operating system levels that can be tuned in various ways to improve performance. The ChaseGeneral steps
Redis Performance Tuning: Save the effect of SNAPSHOT on performance, redissnapshot Some time ago, the Development Environment reported that access to the Redis server was very slow, and each request took several seconds. 2 ~ This will happen again in three days. I checked the Linux performance and there is no problem.
Performance tuning Summary: The speed of an insert query: The time to insert a record is made up of the following: Connection: (3) Send query to server: (2) Analysis query: (2) Insert record: (1 x record size) Insert index: (1 x index) Close: (+) The number here is somewhat proportional to the overall time. This does not take into account the initial cost of opening the table (which is done once for each c
fraction of a second, during which It must find a good execution plan. In tuning mode, the optimizer performs additional analysis to check whether the execution plan produced under normal mode can be improved further. The output of the query optimizer is a execution plan, but a series of actions, along with their rationale and expect Ed benefit for producing a significantly superior plan. When running in the tuni
that we can optimize query requests. This section describes the startup method and information contained in Visual Explain and uses other tuning tools to optimize the performance of query requests. DB2 for IBM I Performance Tuning Tool DB2 for IBM I has provided a series of perfor
Label:Original: SQL Server Tuning Series advanced (in-depth profiling statistics)ObjectiveAfter the analysis of the previous few, in fact, in general has been the first glimpse of the importance of SQL Server statistics, so this article will be sacrificed this artifact.This content will be very long, sit good bench, melon seeds snacks and so on ...No nonsense, go
Tags: nbsp play clob Introduction ring LAN Solution Help SED 1. Brief introduction Oracle DATABASE11GR1 introduces SQL Planmanagement (SPM), a set of new tools that allow DBAs to capture and maintain discretionary SQL statements to run the best plan, limiting refresh optimizer statistics. There has been an application change. Even the impact of a database version number upgrade. This article helps to unders
dbms_workload_repository. Create_snapshot;We can also use the Dbms_workload_repository package to complete the baseline, modification of the default settings and so on.ADDM (Automatic Database Diagnostic Monitor AWR)is a consultant system within Oracle that can automate some of the optimization recommendations for the most databases, give recommendations for SQL optimization, index creation, and statistics collection.ADDM report Generation:Sqlplus>@?
Alarm problem:Too many processes onZabbix Poller processes more than 75% busyZabbix unreachable Poller processes more than 75% busy1. The device that collects the data through the Zabbix agent is in the moniting state but at this time the machine freezes or other causes the Zabbix agent to die the server obtains the data, at this time unreachable pollerWill rise.2. The device that collects the data through the Zabbix agent is in the moniting state, but the server gets the data from the agent too
ObjectiveAfter the analysis of the previous few, in fact, in general has been the first glimpse of the importance of SQL Server statistics, so this article will be sacrificed this artifact.This content will be very long, sit good bench, melon seeds snacks and so on ...No nonsense, go to the chase.Technical preparationThe database version is SQL SERVER2008R2, which is analyzed using Microsoft's previous case
are some bugs, is not necessarily applicable to the core of the online system.3. DRBD Disk Network mirroring schemeAdvantage: Software is powerful, data is mirrored across physical hosts at the underlying fast device level, and different levels of synchronization can be configured according to performance and reliability requirements. IO operations are kept in order to meet the database's demanding data consistency.Disadvantage: Non-Distributed File
]: MySQL 08:32:38> change MASTER toMaster_host= ' 192.168.0.1 ',Master_user= ' Repl ',Master_password= ' PASSWORD ',Master_log_file= ' mysql-bin.000035 ',master_log_pos=399;After executing the change MASTER to command, you can start SLAVE with the following command:[email protected]: MySQL 08:33:49> START SLAVE;At this point, our Replication environment is built. Reader friends can do their own tests to try to build, if you need to understand the MySQL replication build process More detailed
Tags: non-homogeneous project distribution tuning hold writes merge partitions multiple timesReprinted from XiaoruiSome users (especially the external output) when using Maxcompute (original ODPs), due to the use of the product level and level of understanding of the level of implementation, resulting in the implementation of the task is too long, the occupation of more cluster resources, serious will lead to failure, not only need to invest support s
SQLServerProfiler-performance tuning has enough reason to become a hot topic. Today's fierce competition in the business field, if users think that an application is too slow, they will immediately turn to another vendor. To be full SQLServerProfiler-performance tuning has enough reason to become a hot topic. Today's f
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