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The Cluster Latency collection provides Cluster Latency and Activity data.
Oracle
Realtime Collection
20
Online
60
Offline
300
Average Global Cache Convert Time
Average amount of time required for the completion of global conversions on GCS resources.
Average Global Lock Convert Time
Average amount of time required for the completion of synchronous and asynchronous global lock converts.
Average Global Lock Get Time
Average amount of time required for the completion of synchronous and asynchronous global lock gets.
Balance
Interconnect Load balance between the various cluster nodes.
Block Received Latency
The average transfer time of a block from another instance.
Block Sent Latency
The average time needed to prepare a requested block.
Blocks Corrupt Percent
The percentage of global cache blocks that encountered a corruption or checksum failure within the entire number of global cache blocks sent over the Interconnect.
Blocks from Interconnect
The number of blocks received from Interconnect after the requests for blocks were not satisfied from the local instance, and therefore had to make a request for the block from the remote.
Blocks to Interconnect
The number of blocks sent via Interconnect after the requests for blocks were not satisfied on the requesting instance, and therefore had to make a request for the block from the local instance.
Blocks/sec from Interconnect
The rate per second of blocks received from Interconnect after the requests for blocks were not satisfied from the local instance, and therefore had to make a request for the block from the remote.
Blocks/sec to Interconnect
The rate per second of blocks sent via Interconnect after the requests for blocks were not satisfied on the requesting instance, and therefore had to make a request for the block from the local instance.
Cluster Latency Rate
The average time it took to transfer a block through the Interconnect, that is, the time that has elapsed since the request for the block was submitted until the block was received by the requesting instance.
Consistent Gets
The number of times a consistent read was requested for a block by this session
CR Blocks Send Time
Total amount of time spent sending constructed CR Blocks through the Interconnect.
Current Block Send Time
Total amount of time spent sending Current Blocks through the Interconnect.
DB Block Gets
The number of data block reads in CURRENT mode (namely, current reads).
GC Blocks Corrupt
The total number of global cache blocks that encountered a corruption or checksum failure during the specified time range As such failures occur during data transfer, high values of this metric can indicate network-related issues.
GC Blocks Lost
Total number of global cache blocks lost during the specified time range. As the loss of global cache blocks takes place during data transfer, high values of this metric can indicate network-related issues.
GC CR Block Build Time
The average time taken by an LMS process to create a consistent read block on a holding instance within the cluster.
GC CR Block Flush Time
The average time taken by the LGWR (log writer) process to flush any changes required to a buffer on the log flush queue.
GC CR Block Receive Time
Total amount of time foreground processes spent waiting for a CR block to be sent through the Interconnect.
GC CR Block Send Time
The average time taken by an LMS process to initiate the sending of a consistent read block. This is NOT the same as the time elapsed before the block arrives at the requesting instance.
GC CR Blocks Received
Total number of consistent read data blocks that Oracle processes did not find in their local cache and had to fetch from the global cache, using a consistent read request.
GC CR Blocks Served
Total number of blocks constructed by the Block Server Process (BSP).
GC Current Block Flush Time
The average time taken by the LGWR (log writer) process to flush the changes from a block to disk (a forced log flush) before the block is shipped to the requesting instance.
GC Current Block Pin Time
The average time taken by an LMS process to pin the current block before shipping it to the requesting instance.
GC Current Block Receive Time
Total amount of time foreground processes waited for a current block to be sent through the Interconnect.
GC Current Block Send Time
The average time taken by an LMS process to initiate the sending of a current block.
GC Current Blocks Received
GC Current Blocks Served
The number of current blocks shipped to the requesting instance over the hardware Interconnect.
Global Cache Convert Time
Total amount of time spent waiting for global cache converts on all sessions.
Global Cache Converts
Resource converts of buffer cache blocks. This statistic is incremented whenever GCS resources are converted from Null to Exclusive, Shared to Exclusive, or Null to Shared.
Global Lock Convert Time
Total time spent waiting for all synchronous and asynchronous global lock converts.
Global Lock Get Time
Total elapsed time of all synchronous and asynchronous global lock gets.
Global Lock Releases
Total number of synchronous global lock releases.
Global Lock Sync Converts
The total number of resources that Oracle converted from an incompatible mode during the selected time range.
Interconnect Block Latency
The average time it takes to prepare and transfer a block across the Interconnect network.
Lost Blocks Ratio
The ratio of global cache blocks losses during data transfer via the Interconnect.
Received from Interconnect Time
Total amount of time the foreground processes waited for blocks to be sent through the Interconnect
Sent to Interconnect Time
Total amount of time spent sending blocks through the Interconnect
Total CR Blocks
The total number of CR blocks that were served/received through the Interconnect
Total Current Blocks
The total number of current blocks that were served/received through the Interconnect.
Total I/C Load
Total number of blocks (both CR and current) that were served and received from the Interconnect.
The Cluster Misses collection collects data regarding global cache misses.
2-way Misses
The number of current and consistent blocks that were received by the selected instance from a specific instance, after a 2-way roundtrip.
3-way Misses
The number of current and consistent blocks that were received by the selected instance from a specific instance, after a 3-way roundtrip.
Consistent Blocks 2-way Misses
The number of consistent blocks that were received by the selected instance from a specific instance, after a 2-way roundtrip.
Consistent Blocks 3-way Misses
The number of consistent blocks that were received by the selected instance from a specific instance, after a 3-way roundtrip.
Consistent Blocks Misses
The number of consistent blocks that were received by the selected instance from a specific instance, after a 2-way or 3-way roundtrip.
Current Blocks 2-way Misses
The number of current blocks that were received by the selected instance from a specific instance, after a 2-way roundtrip.
Current Blocks 3-way Misses
.The number of current blocks that were received by the selected instance from a specific instance, after a 3-way roundtrip
Current Blocks Misses
The number of current blocks that were received by the selected instance from a specific instance, after a 2-way or 3-way roundtrip.
The Datafile Fragmentation collection collects information regarding the layout of the free space left in the datafile due to fragmentation.
None (on-demand collection).
Datafile name
The name of the datafile
Extent Size
Offset end of the extent from the beginning of the file.
Extent Start
Offset start of the extent from the beginning of the file.
Extent Type
Defines the type of the extent: Used, Fully Usable, Partly Usable or Unusable.
Sequence ID
The datafile’s sequence ID.
The Datafile IO Activity collection collects metrics and performance ratios related to datafile I/O activity.
900
Avg IO Time
Average time spent on a single IO request for a specific datafile
Avg Read Time
Average time spent on a single physical read request for a specific datafile
Avg Write Time
Average time spent on a single physical write request for a specific datafile
Contents
The type of the tablespace contents (temporary, permanent, undo)
File Full Name
The name of the datafile (including full path)
File ID
The datafile ID
File Name
The name of the datafile (without the path)
File Path
The datafile path
IO Time
The total time spent on carrying out IO operations (reading and writing data) on a specific datafile
Last IO Time
The time spent while performing last I/O operation on a specific datafile
Max Single Read Time
The maximum time spent while reading a single block from a specific datafile
Max Single Write Time
The maximum time spent while writing a single block to a specific datafile
Min Single IO Time
The minimum time spent while reading a single block from a specific datafile
PDB
In multitenant architectures, the name of the pluggable database.
Physical IO
Total size, in blocks, of all disk reads and writes for a specific datafile
Physical IO Percent
The IO activity (block reads + block writes) for a specific datafile as a percentage of the total IO activity for all datafiles
Physical Reads
The number of data blocks read by Oracle, which are not present in the buffer cache or in the PGA, thereby requiring I/O read operations, that is: the total number of data blocks read from disk.
Physical Reads Percent
The block reads carried out for a specific datafile as a percentage of the of total block reads carried out for all datafiles
Physical Writes
Total size in blocks of all disk writes for a specific datafile
Physical Writes Percent
The block writes carried out for a specific datafile as a percentage of the of total block writes carried out for all datafiles
Read Requests
The number of read requests for a specific datafile that read one or more database blocks per request.
Read Time
The total time spent on reading data from a specific datafile.
Single Block Read Time
The total time spent on read requests that read one database block per request from a specific datafile.
Single Block Reads
Number of read requests for a specific datafile, which read one database block per request.
Tablespace Name
The tablespace name.
Write Requests
The number of write requests for a specific datafile that wrote one or more database blocks per request.
Write Time
The total time spent on writing data to specific datafile.
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