These columns identify the total disk memory segments released by the File System, as well as those segments that are dropped from memory during the log period. When a segment is released, the segment is either:
- Forced (F)
- Remains resident in memory (R)
- Aged out of memory (A), from segments that are currently resident
Both the number of segments (Rels, Writes, Drps) and the size of the segments (RelKB,WriteKB, DrpKB) are counted. When a segment leaves memory, it must be written to disk only if the segment is dirty (Dy), that is, modified. Otherwise, the clean (Cn), that is, unmodified segment is simply dropped.
Most spool blocks for a small table remain resident when they are created and age there. Each of these will be counted as a dirty resident release (DyRRel columns). If a block survives in the cache, it would be reacquired (whenever the system creates spool data, a subsequent step will read it) and released again. The release will still be counted as a dirty resident release, since the block survived in a modified state. On the other hand, if there is contention for room in the FSG cache, the segment might be removed from memory. Because it is a modified segment, it must be written out first. This is counted as a dirty age write (DyAWrite columns). When it is reacquired it will no longer be modified, so the subsequent release will be counted as a clean resident release (CnRRel columns).
If the segments are modified, only DyAWrites, DyAWriteKB, CnADrps, and CnADrpKB columns are incremented.
If the segments are unmodified, only CnADrps and CnADrpKB columns are incremented.
To determine the clean segments that aged out of memory for the CnADrps column, subtract the DyAWrites value from the CnADrps value. To determine the clean segments that aged out of memory for the CnADrpKB column, subtract the DyAWriteKB value from the CnADrpKB value.
Full table modification operations make one pass on the table and modify each block only once. Since these operations do not access a block multiple times, there is no point keeping them in the cache. If a block that was examined did not contain any rows that qualify for the modification, when the block is released, it will be dropped from memory immediately (FDrp columns). However, if the block was modified, when it is released the system issues the write as part of the release so it is counted as a forced write (FWrite columns). Since the system also drops the block from memory as soon as the write is complete, this release is also counted as a forced drop (FDrp columns).
| Column Name | Mode | Description | Data Type |
|---|---|---|---|
| FileAPtDyRRels | count | Number of dirty append table or permanent journal table data block or cylinder index disk segment resident releases. | FLOAT |
| FilePCiDyRRels | count | Number of dirty permanent cylinder index disk segment resident releases. | FLOAT |
| FilePDbDyRRels | count | Number of dirty permanent data block disk segment resident releases. | FLOAT |
| FileSCiDyRRels | count | Number of dirty regular or restartable spool cylinder index disk segment resident releases. | FLOAT |
| FileSDbDyRRels | count | Number of dirty regular or restartable spool data block disk segment resident releases. | FLOAT |
| FileTJtDyRRels | count | Number of dirty transient journal table or WAL data block or WAL cylinder index disk segment resident releases. | FLOAT |
| FileAPtDyRRelsKB | count | KB released by FileAPtDyRRels. | FLOAT |
| FilePCiDyRRelsKB | count | KB released by FilePCiDyRRels. | FLOAT |
| FilePDbDyRRelsKB | count | KB released by FilePDbDyRRels. | FLOAT |
| FileSCiDyRRelsKB | count | KB released by FileSCiDyRRels. | FLOAT |
| FileSDbDyRRelsKB | count | KB released by FileSDbDyRRels. | FLOAT |
| FileTJtDyRRelsKB | count | KB released by FileTJtDyRRels. | FLOAT |
| FileAPtFWrites | count | Number of append table or permanent journal table data block or cylinder index disk segment forced releases or specific I/O requests causing an immediate physical write. | FLOAT |
| FilePCiFWrites | count | Number of permanent cylinder index disk segment forced releases or specific I/O requests causing an immediate physical write. | FLOAT |
| FilePDbFWrites | count | Number of permanent data block disk segment forced releases or specific I/O requests causing an immediate physical write. | FLOAT |
| FileSCiFWrites | count | Number of regular or restartable spool cylinder index disk segment forced releases or specific I/O requests causing an immediate physical write. | FLOAT |
| FileSDbFWrites | count | Number of regular or restartable spool data block disk segment forced releases or specific I/O requests causing an immediate physical write. | FLOAT |
| FileTJtFWrites | count | Number of transient journal table or WAL data block or WAL cylinder index disk segment forced releases or specific I/O requests causing an immediate physical write. | FLOAT |
| FileAPtFWriteKB | count | KB written by FileAPtFWrites. | FLOAT |
| FilePCiFWriteKB | count | KB written by FilePCiFWrites. | FLOAT |
| FilePDbFWriteKB | count | KB written by FilePDbFWrites. | FLOAT |
| FileSCiFWriteKB | count | KB written by FileSCiWrites. | FLOAT |
| FileSDbFWriteKB | count | KB written by FileSDbFWrites. | FLOAT |
| FileTJtFWriteKB | count | KB written by FileTJtFWrites. | FLOAT |
| FileAPtDyAWrites | count | Number of dirty append table or permanent journal table data block or cylinder index disk segments aged out of memory causing a delayed physical write. | FLOAT |
| FilePCiDyAWrites | count | Number of dirty permanent cylinder index disk segments aged out of memory causing a delayed physical write. | FLOAT |
| FilePDbDyAWrites | count | Number of dirty permanent data block disk segments aged out of memory causing a delayed physical write. | FLOAT |
| FileSCiDyAWrites | count | Number of dirty regular or restartable spool cylinder index disk segments aged out of memory causing a delayed physical write. | FLOAT |
| FileSDbDyAWrites | count | Number of dirty regular or restartable spool data block disk segments aged out of memory causing a delayed physical write. | FLOAT |
| FileTJtDyAWrites | count | Number of dirty transient journal table or WAL data block or WAL cylinder index disk segments aged out of memory causing a delayed physical write. | FLOAT |
| FileAPtDyAWriteKB | count | KB written by FileAPtDyAWrites. | FLOAT |
| FilePCiDyAWriteKB | count | KB written by FilePCiDyAWrites. | FLOAT |
| FilePDbDyAWriteKB | count | KB written by FilePDbDyAWrites. | FLOAT |
| FileSCiDyAWriteKB | count | KB written by FileSCiDyAWrites. | FLOAT |
| FileSDbDyAWriteKB | count | KB written by FileSDbDyAWrites. | FLOAT |
| FileTJtDyAWriteKB | count | KB written by FileTJtDyAWrites. | FLOAT |
| FileAPtCnRRels | count | Number of clean append table or permanent journal table data block or cylinder index disk segment resident releases. | FLOAT |
| FilePCiCnRRels | count | Number of clean permanent cylinder index disk segment resident releases. | FLOAT |
| FilePDbCnRRels | count | Number of clean permanent data block disk segment resident releases. | FLOAT |
| FileSCiCnRRels | count | Number of clean regular or restartable spool cylinder index disk segment resident releases. | FLOAT |
| FileSDbCnRRels | count | Number of clean regular or restartable spool data block disk segment resident releases. | FLOAT |
| FileTJtCnRRels | count | Number of clean transient journal table or WAL data block or WAL cylinder index disk segment resident releases. | FLOAT |
| FileAPtCnRRelKB | count | KB released by FileAptCnRRels. | FLOAT |
| FilePCiCnRRelKB | count | KB released by FilePCiCnRRels. | FLOAT |
| FilePDbCnRRelKB | count | KB released by FilePDbCnRRels. | FLOAT |
| FileSCiCnRRelKB | count | KB released by FileSCiCnRRels. | FLOAT |
| FileSDbCnRRelKB | count | KB released by FileSDbCnRRels. | FLOAT |
| FileTJtCnRRelKB | count | KB released by FileTJtCnRRels. | FLOAT |
| FileAPtFDrps | count | Number of append table or permanent journal table data block or cylinder index disk segment forced releases causing an immediate memory drop. | FLOAT |
| FilePCiFDrps | count | Number of permanent cylinder index disk segment forced releases causing an immediate memory drop. | FLOAT |
| FilePDbFDrps | count | Number of permanent data block disk segment forced releases causing an immediate memory drop. | FLOAT |
| FileSCiFDrps | count | Number of regular or restartable spool cylinder index disk segment forced releases causing an immediate memory drop. | FLOAT |
| FileSDbFDrps | count | Number of regular or restartable spool data block disk segment forced releases causing an immediate memory drop. | FLOAT |
| FileTJtFDrps | count | Number of transient journal table or WAL data block or WAL cylinder index disk segment forced releases causing an immediate memory drop. | FLOAT |
| FileAPtFDrpKB | count | KB dropped by FileAPtFDrps. | FLOAT |
| FilePCiFDrpKB | count | KB dropped by FilePCiFDrps. | FLOAT |
| FilePDbFDrpKB | count | KB dropped by FilePDbFDrps. | FLOAT |
| FileSCiFDrpKB | count | KB dropped by FileSCiFDrps. | FLOAT |
| FileSDbFDrpKB | count | KB dropped by FileSDbFDrps. | FLOAT |
| FileTJtFDrpKB | count | KB dropped by FileTJtFDrps. | FLOAT |
| FileAPtCnADrps | count | Number of clean append table or permanent journal table data block or cylinder index disk segments aged out of memory. | FLOAT |
| FilePCiCnADrps | count | Number of clean permanent cylinder index disk segments aged out of memory. | FLOAT |
| FilePDbCnADrps | count | Number of clean permanent data block disk segments aged out of memory. | FLOAT |
| FileSCiCnADrps | count | Number of clean regular or restartable spool cylinder index disk segments aged out of memory. | FLOAT |
| FileSDbCnADrps | count | Number of clean regular or restartable spool data block disk segments aged out of memory. | FLOAT |
| FileTJtCnADrps | count | Number of clean transient journal table or WAL data block or WAL cylinder index disk segments aged out of memory. | FLOAT |
| FileAPtCnADrpKB | count | KB dropped by FileAPtCnADrps. | FLOAT |
| FilePCiCnADrpKB | count | KB dropped by FilePCiCnADrps. | FLOAT |
| FilePDbCnADrpKB | count | KB dropped by FilePDbCnADrps. | FLOAT |
| FileSCiCnADrpKB | count | KB dropped by FileSCiCnADrps. | FLOAT |
| FileSDbCnADrpKB | count | KB dropped by FileSDbCnADrps. | FLOAT |
| FileTJtCnADrpKB | count | KB dropped by FileTJtCnADrps. | FLOAT |
| FileAPtRelsOther | count | Total number of scratch append table or permanent journal table data block or cylinder index disk segments released as part of them being deleted. | FLOAT |
| FilePCiRelsOther | count | Total number of scratch permanent cylinder index disk segments released as part of them being deleted. | FLOAT |
| FilePDbRelsOther | count | Total number of scratch permanent data block disk segments released as part of them being deleted. | FLOAT |
| FileSCiRelsOther | count | Total number of scratch regular or restartable spool cylinder index disk segments released as part of them being deleted. | FLOAT |
| FileSDbRelsOther | count | Total number of scratch regular or restartable spool data block disk segments released as part of them being deleted. | FLOAT |
| FileTJtRelsOther | count | Total number of scratch transient journal table or WAL data block or WAL cylinder index disk segments released as part of them being deleted. | FLOAT |
| FileAPtRelOtherKB | count | Total number of scratch append table or permanent journal table data block or cylinder index disk segments released in KB. | FLOAT |
| FilePCiRelOtherKB | count | Total number of scratch permanent cylinder index disk segments released in KB. | FLOAT |
| FilePDbRelOtherKB | count | Total number of scratch permanent data block disk segments released in KB. | FLOAT |
| FileSCiRelOtherKB | count | Total number of scratch regular or restartable spool cylinder index disk segments released in KB. | FLOAT |
| FileSDbRelOtherKB | count | Total number of scratch regular or restartable spool data block disk segments released in KB. | FLOAT |
| FileTJtRelOtherKB | count | Total number of scratch transient journal table or WAL data block or WAL cylinder index disk segments released in KB. | FLOAT |