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Improve DBWR Throughput To improve DBWR's throughput, consider the following: Disk capabilities and setup (stripe size, speed, controllers etc...) Using raw devices instead of File System files -- dep...

The session waits for the lock handle of a global lock request on the distributed file system (DFS). It is most common in a parallel server situation. Solutions During a period of wait, use the...

Average number of milliseconds waiting for the "log file sync" event, indicating commit times for this database. Solutions If this is high, review solutions presented in the help file for "log ...

Key compressed indexes are a way to index a low cardinality column without talking up as much space storing the repetitive values. Please view the Oracle Manuals for a full description on implementing...

The terms "high cardinality" and "low cardinality" are frequently used when discussing table columns. A high cardinality column means that a column has many unique values. For example, a primary key c...

Solution By itself, the buffer cache hit ratio is not very meaningful except for databases with undersized data buffer cache (db_cache_size parameter). Oracle provides the data buffer cache advisory u...

Sessions waiting on this event are waiting on locks held during materialized view operations (such as refresh, alter) to prevent concurrent operations on the same materialized view. Solutions A materi...

Overview of setup and configuration Oracle Enterprise Edition 11gR2. 11.2.0.1.0 Linux RH5 NetBackup 6.5.5 Identical environments: Identical versions of Oracle. Same ORACLE_HOME and ORACLE_BASE. The ar...

show parameter power alter system set asm_power_limit=0; alter diskgroup MACLEAN add FAILGROUP FailgroupA disk '/asmdisks/asmdiskA28'; alter diskgroup MACLEAN add FAILGROUP FailgroupA disk '/asmdisks/...

ProcDump与Procexp一样是Windows平台上的内部调试工具，Procexp采用图形界面体现系统整体及个别进程的性能信息，而ProcDump则与我们在Unix平台上使用的性能分析工具类似使用CLI命令行界面。 Procdump目前的版本号为3.04，可以从其Homepage上下载到该工具，该监控软件由Mark Russinovich开发，是一款Free Software。其官方介绍如下...