Purpose
The PARTITION command displays granted and blocked partition-aware locks. These types of locks lock a range of row partitions.
Currently, the partition range is limited by default to a single row partition, except in the case of the DBC.AccessRights table, where a lock can be applied across a range of row partitions to a single rowhash or all rowhashes.
Syntax
{ PARTITION | PART } [
DBname.Tablename TypeAndIndex |
ALL
]
- DBname.Tablename
- The name of a database and the name of a table separated by a required period (.).
- TypeAndIndex
- A subtable identifier.
- ALL
- That all row-partitioned tables that have a lock applied to a range of partitions are considered.
Usage Notes
The following table shows the components of partition command output.
| Component... | Specifies... |
|---|---|
| Tran | currently running transactions with locks being applied. |
| Hash Locks | Hash locks are not relevant to the PARTITION command. |
| Range Locks | the total number of range locks applied by the transaction. |
| Partition Locks | the number of partition range locks applied by the transaction. |
| Host | the logical host ID (origin of the transaction). |
| Session | the session number for the transaction. |
| Mode | the type of lock mode:
|
| User | the logon-ID for whom the lock is being requested. |
| Database | the name of the database with granted or blocked locks. |
| Table | the name of the table with granted or blocked locks. |
| PLLKind | the type of partition-level lock that is applied. This only appears for locks on row-partitioned tables. |
| Subtable ID | the identifier of the subtable to which the partition range lock is applied. |
| Partition1 and Partition2 | the internal partition numbers that define the beginning and ending partitions in the range of locked partitions. The partition range is currently limited to a single partition.
The internal partition number is part of the rowid of the physical row. It is displayed in hexadecimal as [[[hhhh.] hhhh.] [hhhh.hhhh]] or zero. |
| RowHash1 and RowHash2 | the first and second portions of the row hash, representing the locked rowhash in the range of partitions. Both decimal and hexadecimal numbers are accepted. A decimal number must be followed by a period. |
In the following examples RPT1 and RPT2 are row-partitioned tables.
Examples: PARTITION command examples
This example shows:
- a write lock on all rows in partition 0004 in a row-partitioned table.
- a write lock on the row or rows having rowhash 1,17 in partition 0007 in a non-partitioned table.
-> Please enter your selection from the list: partition - The following amps are available: 0 1 2 3 -> Which amp(s) do you want to request on (S=Sampling/A=all/C=cancel/Q=quit): 1 ---------------- AMP 1 REPORTS 2 LOCK ENTRIES ------------- GRANTED LOCK REQUEST(S): Tran: 30719 00015DCA Hash Locks : 1 Range Locks : 6 Partition Locks: 2 Host: 1025 Session: 0, 1003 Mode: WR User: EXAMPLE Database: EXAMPLE Table: RPT1 PLLKind: IPN Partition Range Subtable ID: 1024 : Partition1 : 0004 Row Hash1: 0, 0 : Partition2 : 0004 Row Hash2: 0, 0 Host: 1025 Session: 0, 1003 Mode: WR User: EXAMPLE Database: EXAMPLE Table: RPT2 PLLKind: RowHash + IPN Part'n Range Subtable ID: 1024 : Partition1 : 0007 Row Hash1: 1, 17 : Partition2 : 0007 Row Hash2: 1, 17 -> Please enter your selection from the list: partition example.rpt1 400 - The following amps are available: 0 1 2 3 -> Which amp(s) do you want to request on (S=Sampling/A=all/C=cancel/Q=quit): 1 ---------------- AMP 1 REPORTS 1 LOCK ENTRIES ------------- GRANTED LOCK REQUEST(S): Tran: 30719 00015DCA Hash Locks : 1 Range Locks : 6 Partition Locks: 1 Host: 1025 Session: 0, 1003 Mode: WR User: EXAMPLE Database: EXAMPLE Table: RPT1 PLLKind: IPN Partition Range Subtable ID: 1024 : Partition1 : 0004 Row Hash1: 0, 0 : Partition2 : 0004 Row Hash2: 0, 0 -> Please enter your selection from the list: partition example.rpt2 400 - The following amps are available: 0 1 2 3 -> Which amp(s) do you want to request on (S=Sampling/A=all/C=cancel/Q=quit): 1 ---------------- AMP 1 REPORTS 1 LOCK ENTRIES ------------- GRANTED LOCK REQUEST(S): Tran: 30719 00015DCA Hash Locks : 1 Range Locks : 6 Partition Locks: 1 Host: 1025 Session: 0, 1003 Mode: WR User: EXAMPLE Database: EXAMPLE Table: RPT2 PLLKind: RowHash + IPN Part'n Range Subtable ID: 1024 : Partition1 : 0007 Row Hash1: 1, 17 : Partition2 : 0007 Row Hash2: 1, 17