New Processes
Each new version of Oracle Database brings forth a new set of abbreviations for new processes. Here is the list for Oracle Database 11g Release 1:| Process | Name | Description |
| ACMS | Atomic Controlfile to Memory Server | Only applicable in a RAC instance. When a distributed SGA update is issued, ACMS ensures that the update happens on all instances. If the update fails on one, this process also rolls it back on all instances. Think of ACMS as a two-phase commit coordinator process for SGA updates in a RAC cluster. |
| DBRM | Database Resource Manager | Implements the resource plans and other resource manager-related tasks |
| DIA0 | Diagnosibility process 0 | Detects hang situations and deadlocks. In the future there may be more than one process, so the name is set as diag0. The other processes, if they come in the future will be named dia1, dia2, etc. |
| DIAG | Diagnosibility process | Performs the diagnostics, dumps trace files, if necessary and performs global oradebug commands |
| FBDA | Flashback Data Archiver | Oracle Database 11g has a new “Flashback Archives” to write the changes made to a table (refer to “Transactions Management” installment of this series). This process writes the flashback archives. |
| GTX0 | Global Transaction Process 0 | In a RAC cluster, Oracle Database now provides improved handling of XA transactions. This process coordinates XA transactions. If the database load on XA grows, more processes are automatically created with names GTX1, GTX2, upto GTXJ. |
| KATE | Konductor (Conductor) of ASM Temporary Errands | Undoubtedly the grandest name of all new processes. This is seen on ASM instances; not the database. (Refer to the installment on this series on ASM for the new feature Fast Disk Resync.) When a disk goes offline, this process performs a proxy I/O on its behalf to an ASM metafile. |
| MARK | Mark AU for Resync Koordinator (coordinator) | Refer to the ASM installment for more details on the resiliency of the ASM diskgroups. When a disk fails, it becomes offline, causing writes to miss. In that case, this process marks the ASM allocation units (AUs) as stale. When the disk comes online, the stale segments will be refreshed. |
| SMCO | Space Manager | SMCO is the master space management process that dynamically allocates and deallocates space. It spawns slave processes Wnnn to implement the tasks. |
| VKTM | Virtual Keeper of TiMe process | Provides a wall clock equivalent (with 1 second updates). When running at elevated priority, it provides a 20 ms update. |
| W000 | Space Management Worker Processes | Implements the instructions received from SMCO. More processes are spawned as needed with names like W000, W001 and so on. |
Oracle 11.1 Background ProcessesIn Oracle 10.2 there were 157 background parameters; in Oracle 11.1 there are 212 background processes The following table shows the 56 background processess that were added in Oracle 11.1
The following table shows the one background process that was removed in Oracle 11.1
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