对于绝大多数OLTP系统来说,SQL相对比较简单,每次的运行时间都非常快,绝大部分SQL的响应时间都应该在10MS以下,优化的复杂度也比较低,SQL MONITORING功能的出现并不是为了帮助DBA发现、诊断OLTP SQL的性能问题,而是为了加快DBA优化数据仓库类SQL的效率,这些SQL是偏OLAP系统的,特点是并发量低、运行时间久、SQL复杂度高。
一、问题现象 在YashanDB 中执行包含 Oracle dblink 表的 SQL,整体执行时间远高于直接在 Oracle 中通过 dblink 查询的耗时。 相同的数据量、相同的 SQL 逻辑; Oracle 通过 dblink 查询远端 Oracle 数据,仅需不到 1 秒; YashanDB 通过 dblink 查询远端 Oracle,同样 SQL,执行时间明显变长。 二、风险与影响 查询...
通过前面的介绍相信大家对Oracle SQL monitor华丽、直观的界面留下了深刻的印象,下面我再总结一下使用Oracle SQL monitor进行SQL优化的步骤: 通过SQL monitor监控我们可以快速地发现异常运行的SQL语句,如果您知道SQL对应的SQL ID也可以通过脚本利用SQL monitor查看SQL语句在数据库中真实的执行计划。 查看SQL执行计划,通过C...
(such as, num_rows, blocks, avg_row_len and so on) of tablechecking_tablespace_growth.sql- Checking the growth of tablespacechecking_tablespace_growth_2.sql- The 2nd version of checking the growth of tablespacemonitor_big_table_size.sql- Monitoring the used size of big tables by using ...
http://www.os2ora.com/use-sql-monitor-report-to-tune-and-diagnose-sql/ http://www.os2ora.com/fantastic-11gr2-sql-monitor-report/ http://www.oracle-base.com/articles/11g/real-time-sql-monitoring-11gr1.php http://docs.oracle.com/cd/E11882_01/appdev.112/e16760/d_sqltun.htm ...
Scripts and Tips for Monitoring CPU Resource Manager (Doc ID 1338988.1) Migrating Databases using Instance Caging to a CDB (Doc ID 1567141.1) How to Control and Monitor the Memory Usage (Both SGA and PGA) Among the PDBs in Mutitenant Database- 12.2 New Feature (Doc ID 2170772.1) Managing...
Monitoring Search PL/SQL Security Application Express Data Modeler Migration User Defined Basic tabular Master-detail Charts Gauges HTML Drill down Script Most of the provided reports include click-through. If a user clicks on a resulting row, the definition of the object in that row is displayed...
Monitoring Search PL/SQL Security Application Express Data Modeler Migration User Defined Basic tabular Master-detail Charts Gauges HTML Drill down Script Most of the provided reports include click-through. If a user clicks on a resulting row, the definition of the object in that row is displayed...
Monitoring via SNMP 6.2. Agent extensions The HW/SW inventory Monitoring files Monitoring log files Monitoring Oracle databases Monitoring MySQL Monitoring MSSQL Monitoring MSSQL with the legacy plug-in Monitoring time-based processes (Cronjobs) The spool directory Local checks 6.3. VM...
Release 1 (11.1.1.7) E10230-09 February 2013 Documentation for report creators that describes how to create and format reports, use and format data in views, and organize and share reports in Oracle Business Activity Monitoring (BAM) using Oracle BAM Active Studio and Oracle BAM Active Viewer....