This topic describes statistics used to monitor system operation. The Core services provide a very large number of statistics for monitoring the operation of the system. Some of them are useful for monitoring performance, while some of them exist for monitoring the operation of the system or for debugging purposes.
Statistics in /database/stats
The following table shows the meaning of the statistics in /database/stats.
|meta.bytes, packet.bytes, session.bytes||The total size of data (in bytes) stored in each database|
|meta.first.id, packet.first.id, session.first.id||The first meta ID, packet ID, and session ID, respectively, stored in the database|
|meta.last.id, packet.last.id, session.last.id||The last meta ID, packet ID, and session ID, respectively, stored in the database|
|meta.oldest.file.time, packet.oldest.file.time, session.oldest.file.time||The creation date of the oldest file in each database|
|meta.rate, packet.rate, session.rate||The count of the number of meta, packet, and session objects added to each database over the last second|
|meta.total, packet.total, session.total||The total number of meta, packet, and session objects within each database|
|meta.volume.bytes, packet.volume.bytes, session.volume.bytes||The approximate total volume size (in bytes) for all directories used by each database|
|meta.free.space, packet.free.space, session.free.space||The approximate total unused space (in bytes) across all directories used by each database|
Statistics in /index/stats
The following table shows the meaning of the statistics in /index/stats.
|checkpoint.page, checkpoint.summary||The last objects stored the last time an index save was created (debugging)|
|index.bytes||An approximate measure of how much disk space is required by index files|
|index.last.load.time||The timestamp when the current index configuration was loaded from the index configuration files|
|memory.used||An approximate measure of how much memory is occupied by the index|
|page.first.id, summary.first.id||The first page and summary object stored in the index (debugging)|
|page.last.id, summary.last.id||The last page and summary object stored in the index (debugging)|
|page.total, summary.total||Number of pages and summaries in the index (debugging)|
|session.first.id||The ID of the first session indexed|
|session.last.id||The ID of the last session indexed|
|sessions.since.save||The number of sessions currently held by the current index slice|
|values.added||The number of unique values added to the current index slice|
|slices.total||The number of slices in the index|
|time.begin||The oldest time meta indexed|
|time.end||The most recent time meta indexed|
Statistics in /sdk/stats
The following table shows the meaning of the statistics in /sdk/stats.
|cache.window.time.begin||The beginning of the current time enforced by cache.window.minutes|
|cache.window.time.end||The end of the current time enforced by cache.window.minutes|
|queries.active||The number of queries currently executing in the index|
|queries.queued||The number of queries waiting for execution|
|values.calls||The number of calls made to the "values" function since the process was started|
|values.calls.cached||The number of calls made to the "values" function that were resolved by the values call result cache|
SDK operations, such as query and values, provide information about their execution status in /sdk/config/stats/queries/<handleid>, where <handleid> is a unique identifier for the query operation.
The following table shows the meaning of per-query statistics.
|channel.path||This stat provides a link to the connection channel over which the operation is communicating. This channel is used to communicate results back to the client.|
|query.type||The type of operation being performed, such as queries or values|
|query||The complete set of parameters given to the query|
|query.progress||The percentage of the query execution that has completed|
|query.status||A message describing what stage of the query execution is currently occurring|
|running.since||The time at which the query began execution|
|user||The user name that executed the query|