Flash Cache Hit %: 0.00 在此範例中,所有指標看起來都不錯,因此您可以將 SGA和 PGA 作為現有資料庫的容量規劃需求。 檢查記憶體統計資料區段並計算 SGA/PGA。 開始 結束 Host Mem (MB): 452,387.3 452,387.3 SGA 使用 (MB): 220,544.0 220,544.0 ...
扩展缓冲区缓存包括内存缓冲区缓存(包含整个缓冲区)和flash缓存(包含缓冲体)。在图中,数据库在缓冲区缓存中搜索缓冲区但没找到时,它会将数据块从磁盘读入内存。 一般来说,通过cache hit 访问数据比通过cache miss访问数据要快。缓冲区缓存命中率度量数据库在不需要从磁盘读取数据的情况下,缓冲区缓存中找到被请求数据...
100.00 library hit %: 89.21 soft parse %: 91.37 execute to parse %: 48.96 latch hit %: 100.00 parse cpu to parse elapsd %: 47.06 % non-parse cpu: 50.82 flash cache hit %: 0.00 top 10 foreground events by total wait time event waits total wait time (sec) wait avg(ms) % db time...
OLAP Paging Manager Cache Miss 64 The number of times a requested page is not found in the OLAP page pool. Use this statistic in conjunction with OLAP Paging Manager Cache Hit to determine the OLAP page pool efficiency ratio. OLAP Paging Manager New Page 64 The number of newly-created ...
OracleAWR内容详解 1.AWR 报告头信息 KTDB1107793954ktdb PRIMARY EE19.0.0.0.0YES NO ktdb2202-3⽉ -20 19:35 hn-ekdb2Linux x86 64-bit80804753.98 Begin Snap:533914-5⽉ -20 08:00:03159.54 End Snap:534214-5⽉ -20 11:00:14168.64 Elapsed:180.17 (mins)DB Time: 1.23 (...
It is common for hit rates in the Exadata Smart Flash Cache to be over 95%, or even 99% in real-world database workloads, yielding an effective flash capacity many times larger than the physical flash. For example, a traditional full rack6, often has an effective flash capacity close to...
ORACLE进程分后台进程跟服务进程，DBWR是后台进程，它只负责将DBBUFFER脏数据写到数据文件，是单向的。而与用户进程对应的服务进程则将数据块读到SGA。concepts上写的很清楚：Oracle processes run the Oracle server code. They include server processes and background processes.Server processes (or the ...
(GB) • Volume Group LUN Statistics • Serial Number • Cache Flushes each Second • Cache Hit Ratio • LUN FQN • LUN ID • LUN Name • Non-Optimized I/O each Second • Read Block Size • Read Bytes Per Second • Read I/Os Per Second • Read Latency • Read ...
38 サーバー性能監視 ServerStats • 定義済み Oracle Database メトリック • Average active session • Average active sessions on CPU • Cache Hit Ratio • CPU parse usage • CPU recursive usage • Data Dictionary Cache Hit Ratio • Library Cache Hit Ratio • PGA (MB) • ...
mydb=# select*from pg_statio_all_indexes where relname='t1';relid|indexrelid|schemaname|relname|indexrelname|idx_blks_read|idx_blks_hit---+---+---+---+---+---+---24604|24613|public|t1|t1_index|150|453(1row) 显示了读取过多少个数据块,这些读取中有多少数据块是直接命中缓存的。 在...