System Stat Summary (PD)
- Organization of this page
Function
The System Stat Summary (PD) record stores performance data, taken at a specific point in time, indicating cumulative values from the start of the instance.
- Notes
-
If the monitoring target is Oracle Database 12c Release 2 or later in a CDB configuration, some fields in this record collect common performance data for database instances. The following table shows the relationship between the fields and performance data.
Fields
Performance data
When monitoring PDBs
When monitoring the root container (CDB$ROOT)
Dict Cache Get Misses %
Lib Cache Miss %
Redo Alloc Immediate %
Redo Alloc Willing to Wait %
Redo Copy Immediate %
Redo Copy Willing to Wait %
Displays common performance data for database instances.
- Note
-
The fields collect the same value when monitoring either the PDB or the root container (CDB$ROOT). To prevent alarm notification from multiple instances of PFM - Agent for Oracle, select the instance to be monitored.
Free List Wait Events
Sys Undo Blk Wait Events
Sys Undo Hdr Wait Events
Undo Blk Wait Events
Undo Hdr Wait Events
Displays performance data for the PDBs that are being monitored.
-
Use administrative accounts (sys or system)
Performance data for all PDBs and the root container (CDB$ROOT) are collected.
-
Use common user
Performance data for the root container (CDB$ROOT) is collected.
Recursive To User Call %
SQL Executing
As with non CDB, unable to collect valid performance data.
Fields except for above
Displays performance data for the PDBs that are being monitored.
Displays common performance data for database instances.
Default and changeable values
|
Item |
Default value |
Changeable |
|---|---|---|
|
Collection Interval |
300 |
Y |
|
Collection Offset |
0 |
Y |
|
Log |
No |
Y |
|
LOGIF |
(Blank) |
Y |
|
Over 10 Sec Collection Time |
No |
N |
ODBC key fields
None
Lifetime
From the creation to the deletion of an Oracle instance
Record size
-
Fixed part: 1,130 bytes
-
Variable part: 0 bytes
Fields
|
PFM - View name (PFM - Manager name) |
Description |
Summary |
Format |
Delta |
Supported version |
Data source |
|---|---|---|---|---|---|---|
|
Block Changes/Tran (BLOCK_CHANGES_PER_TRANSACTION) |
Rate at which each transaction executed DML operation |
-- |
double |
No |
All |
db block changes / user commits |
|
Block Visits/Tran (BLOCK_VISITS_PER_TRANSACTION) |
Number of times a work database was loaded per transaction |
-- |
double |
No |
All |
(db block gets + consistent gets) / user commits |
|
Buffer Busy Wait % (BUFFER_BUSY_WAIT_PERCENTAGE) |
Percentage ratio of buffer busy waits |
-- |
double |
No |
All |
(V$SYSTEM_EVENT.TOTAL_WAITS where EVENT = 'buffer busy waits' / (consistent gets + db block gets)) * 100 |
|
Cache Hit % (CACHE_HIT_PERCENTAGE) |
Buffer cache usage |
-- |
double |
No |
All |
(1 - (physical reads cache / (consistent gets from cache + db block gets from cache))) * 100 |
|
Calls/Tran (CALLS_PER_TRANSACTION) |
Rate at which client requests were executed per transaction |
-- |
double |
No |
All |
user calls / user commits |
|
Changed Block % (CHANGED_BLOCK_PERCENTAGE) |
Percentage ratio of difference between query and database manipulation language (DML) in the database application. This value changes according to indexes and application utilization status. |
-- |
double |
No |
All |
(db block changes / (block gets + consistent gets)) * 100 |
|
Consistent Change % (CONSISTENT_CHANGE_PERCENTAGE) |
Percentage ratio of extents used for consistency of application read operations |
-- |
double |
No |
All |
(consistent changes / consistent gets) * 100 |
|
Continued Row % (CONTINUED_ROW_PERCENTAGE) |
Percentage ratio of continued rows. The value is close to 0 unless the application handles LONG columns. |
-- |
double |
No |
All |
(table fetch continued row / (table fetch by rowid + table scan rows gotten)) * 100 |
|
Current Logons (CURRENT_LOGONS) |
Number of current login to Oracle Database |
-- |
long |
No |
All |
V$SYSSTAT.VALUE |
|
Deadlocks (LOCK_DEADLOCKS) |
Number of deadlocks caused by locked DML processing |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Dict Cache Get Misses % (DICTIONARY_CACHE_GET_MISSES_PERCENTAGE) |
Percentage ratio of data requests issued due to cache miss |
-- |
double |
No |
All |
(SUM(V$ROWCACHE.GETMISSES) / SUM(V$ROWCACHE.GETS)) * 100 |
|
Disk Sorts (SORTS_DISK) |
Number of disk sort operations |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Free List Wait Events (FREE_LIST_WAIT_EVENTS) |
Number of wait events in the free list |
-- |
double |
No |
All |
V$WAITSTAT.COUNT where class = 'free list' |
|
Lib Cache Miss % (LIBRARY_CACHE_MISS_PERCENTAGE) |
Library cache miss rate. This field means the ratio of times the allocated objects in library cache are reloaded. As the value of this field increases, the amount of resources in use also increases. |
-- |
double |
No |
All |
(SUM(V$LIBRARYCACHE.RELOADS) / SUM(V$LIBRARYCACHE.PINS)) * 100 |
|
Lock Conversions (LOCK_CONVERSIONS) |
Number of enqueues (locks) whose mode was changed (such as from share to lock) |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Lock Releases (LOCK_RELEASES) |
Number of times enqueuing (locking) was released |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Lock Requests (LOCK_REQUESTS) |
Number of times enqueuing (locking) was requested |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Lock Timeouts (LOCK_TIMEOUTS) |
Number of times an enqueuing (locking) request was not permitted within the allocated time |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Lock Waits (LOCK_WAITS) |
Number of times an enqueuing (locking) request was placed in wait status. The difference between the enqueuing requests count and the enqueuing waits count is the number of times the request was not treated as an enqueuing request. |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Logical Reads (LOGICAL_READS) |
Number of logical read operations in read consistency mode and number of requests to the current copy of blocks |
-- |
double |
No |
All |
db block gets + consistent gets |
|
Memory Sorts (SORTS_MEMORY) |
Number of sort operations in memory |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Non-Index Lookups % (NON_INDEX_LOOKUPS) |
Percentage ratio of full table scans that do not involve caching |
-- |
double |
No |
All |
(table scans (long tables) / (table scans (short tables) + table scans (long tables))) * 100 |
|
Physical Reads (PHYSICAL_READS) |
Number of physical read operations on database block from disk |
-- |
double |
No |
All |
physical reads - physical reads direct - physical reads direct (lob) |
|
Physical Writes (PHYSICAL_WRITES) |
Number of physical write operations on the disk by DBWR |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Record Time (RECORD_TIME) |
Collection termination time for the performance data stored in the record |
-- |
time_t |
No |
All |
Agent Collector |
|
Record Type (INPUT_RECORD_TYPE) |
Record name (always PD) |
-- |
string(4) |
No |
All |
Agent Collector |
|
Recursive Calls (RECURSIVE_CALLS) |
Number of user calls processed |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Recursive To User Call % (RECURSIVE_TO_USER_CALL_PERCENTAGE) |
Correct values cannot be collected in this field. Percentage indicating overhead |
-- |
double |
No |
All |
(recursive calls / user calls) * 100 |
|
Redo Alloc Immediate % (REDO_ALLOC_IMMEDIATE_HIT_PERCENTAGE) |
Success rate of immediately acquiring REDO allocation latch |
-- |
double |
No |
All |
(1 - (V$LATCH.IMMEDIATE_MISSES / (V$LATCH.IMMEDIATE_GETS + V$LATCH.IMMEDIATE_MISSES))) * 100 where V$LATCH.NAME = 'redo allocation' |
|
Redo Alloc Willing to Wait % (REDO_ALLOC_WILLING_TO_WAIT_HIT_PERCENTAGE) |
Success rate of acquiring REDO allocation latch from cache |
-- |
double |
No |
All |
(1 - (V$LATCH.MISSES / V$LATCH.GETS)) * 100 where name = 'redo allocation' |
|
Redo Copy Immediate % (REDO_COPY_IMMEDIATE_HIT_PERCENTAGE) |
Success rate of immediately acquiring REDO copy latch |
-- |
double |
No |
All |
(1 - (V$LATCH.IMMEDIATE_MISSES / (V$LATCH.MMEDIATE_GETS + V$LATCH.IMMEDIATE_MISSES))) * 100 where name = 'redo copy' |
|
Redo Copy Willing to Wait % (REDO_COPY_WILLING_TO_WAIT_HIT_PERCENTAGE) |
Success rate of acquiring REDO copy latch from cache |
-- |
double |
No |
All |
(1 - (V$LATCH.MISSES / V$LATCH.GETS)) * 100 where name = 'redo copy' |
|
Redo Log Buffer Alloc Retries (REDO_LOG_BUFFER_ALLOC_RETRIES) |
Number of waits that occurred when an attempt was made to allocate the REDO log buffer |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Redo Log Buffer Wait % (REDO_LOG_BUFFER_WAIT_PERCENTAGE) |
Percentage of waits that occurred when an attempt was made to allocate the REDO log buffer |
-- |
double |
No |
All |
(redo buffer allocation retries / redo entries) * 100 |
|
Redo Log Space Requests (REDO_LOG_SPACE_REQUESTS) |
Number of times Oracle must wait for disk spaces to be allocated to REDO log entry because the active log file is full. |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Redo Log Space Wait % (REDO_LOG_SPACE_WAIT_PERCENTAGE) |
Percentage of waiting time for disk space to be allocated for the REDO log entry. |
-- |
double |
No |
All |
(redo log space requests / redo entries) * 100 |
|
Row Source % (ROW_SOURCE_PERCENTAGE) |
Percentage ratio of rows obtained by full-table scan |
-- |
double |
No |
All |
(table scan rows gotten / (table fetch by rowid + table scan rows gotten)) * 100 |
|
SQL Executing (SQL_EXECUTING) |
This field is not supported. Number of current SQL executions |
-- |
double |
No |
Not supported |
Agent Collector |
|
SQL Net Bytes Rcvd (SQL_NET_BYTES_RECEIVED) |
Amount of data received from clients via SQL*Net |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
SQL Net Bytes Sent (SQL_NET_BYTES_SENT) |
Amount of data sent to clients via SQL*Net |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Session CPU Usage (SESSION_CPU_USAGE) |
CPU time used in 1/100 seconds. To collect the value of this field, the TIMED_STATISTICS parameter must be set to TRUE in the init.ora file. |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Session Cursor Cache Count (SESSION_CURSOR_CACHE_COUNT) |
Number of session cursors cached. The SESSION_CACHED_CURSORS parameter in the init.ora file specifies the maximum value of this field. |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Session Cursor Cache Hit % (SESSION_CURSOR_CACHE_HIT_PERCENTAGE) |
Hit rate of analysis calls in session's cursor cache |
-- |
double |
No |
All |
(session cursor cache hits / session cursor cache count) * 100 |
|
Session Cursor Cache Hits (SESSION_CURSOR_CACHE_HITS) |
Number of times a cursor was found in the session's cursor cache by analysis call |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Session PGA Memory (SESSION_PGA_MEMORY) |
Size of PGA memory currently being used in bytes |
-- |
double |
No |
All |
SUM(V$SESSTAT.VALUE) |
|
Session UGA Memory (SESSION_UGA_MEMORY) |
Size of used session memory in bytes |
-- |
double |
No |
All |
SUM(V$SESSTAT.VALUE) |
|
Sort Overflow % (SORT_OVERFLOW_PERCENTAGE) |
Percentage ratio of sort operations using a temporary segment |
-- |
double |
No |
All |
(sorts (disk) / (sorts (memory) + sorts (disk))) * 100 |
|
Start Time (START_TIME) |
Collection start time for the performance data stored in the record |
-- |
time_t |
No |
All |
Agent Collector |
|
Sys Undo Blk Wait Events (SYSTEM_UNDO_BLOCK_WAIT_EVENTS) |
Number of block wait events for the system's rollback segment |
-- |
double |
No |
All |
V$WAITSTAT.COUNT where class = 'system undo block' |
|
Sys Undo Hdr Wait Events (SYSTEM_UNDO_HEADER_WAIT_EVENTS) |
Number of header block wait events for the system's rollback segment |
-- |
double |
No |
All |
V$WAITSTAT.COUNT where class = 'system undo header' |
|
Total Logons (TOTAL_LOGONS) |
Number of logins to the server |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Total SQL Executions (TOTAL_SQL_EXECUTIONS) |
Total number of SQL executions |
-- |
double |
No |
All |
execute count |
|
Undo Blk Wait Events (UNDO_BLOCK_WAIT_EVENTS) |
Number of block wait events for other rollback segments |
-- |
double |
No |
All |
V$WAITSTAT.COUNT where class = 'undo block' |
|
Undo Hdr Wait Events (UNDO_HEADER_WAIT_EVENTS) |
Number of header block wait events for other rollback segments |
-- |
double |
No |
All |
V$WAITSTAT.COUNT where class = 'undo header' |
|
User Calls (USER_CALLS) |
Number of user calls processed |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
User Calls / Parse (USER_CALLS_PER_PARSE) |
Application management status in the context area |
-- |
double |
No |
All |
user calls / parse count (total) |
|
User Commits (USER_COMMITS) |
Number of transactions |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
User Rollback % (USER_ROLLBACK_PERCENTAGE) |
Failure rate of application transactions |
-- |
double |
No |
All |
(user rollbacks / (user commits + user rollbacks)) * 100 |
|
User Rollbacks (USER_ROLLBACKS) |
Number of rollbacks |
-- |
double |
No |
All |
V$SYSSTAT.VALUE |
|
Write % (WRITE_PERCENTAGE) |
Percentage ratio of write operations |
-- |
double |
No |
All |
(physical writes / (physical reads + physical writes)) * 100 |