After enabling archive log mode, customer complaint their database cannot DML any more.
After examining db2diag.log and tablespace status, one of tablespaces used by db2 load are in
backup pending status.
From the inforcenter of load command, load have three options which would impact database status in different log circulate mode.
- COPY NO
Specifies that the table space in which the table resides will be placed in backup pending state if forward recovery is enabled (that is, logretain or userexit is on). The COPY NO option will also put the table space state into the Load in Progress table space state. This is a transient state that will disappear when the load completes or aborts. The data in any table in the table space cannot be updated or deleted until a table space backup or a full database backup is made. However, it is possible to access the data in any table by using the SELECT statement.
LOAD with COPY NO on a recoverable database leaves the table spaces in a backup pending state. For example, performing a LOAD with COPY NO and INDEXING MODE DEFERRED will leave indexes needing a refresh. Certain queries on the table might require an index scan and will not succeed until the indexes are refreshed. The index cannot be refreshed if it resides in a table space which is in the backup pending state. In that case, access to the table will not be allowed until a backup is taken. Index refresh is done automatically by the database when the index is accessed by a query. If one of COPY NO, COPY YES, or NONRECOVERABLE is not specified, and the database is recoverable (logretain or logarchmeth1 is enabled), then COPY NO is the default.
- COPY YES
Specifies that a copy of the loaded data will be saved. This option is invalid if forward recovery is disabled.
- USE TSM
Specifies that the copy will be stored using Tivoli® Storage Manager (TSM).
- OPEN num-sess SESSIONS
The number of I/O sessions to be used with TSM or the vendor product. The default value is 1.
- TO device/directory
Specifies the device or directory on which the copy image will be created.
- LOAD lib-name
The name of the shared library (DLL on Windows operating systems) containing the vendor backup and restore I/O functions to be used. It can contain the full path. If the full path is not given, it will default to the path where the user exit programs reside.
- USE TSM
Specifies that the load transaction is to be marked as nonrecoverable and that it will not be possible to recover it by a subsequent roll forward action. The roll forward utility will skip the transaction and will mark the table into which data was being loaded as "invalid". The utility will also ignore any subsequent transactions against that table. After the roll forward operation is completed, such a table can only be dropped or restored from a backup (full or table space) taken after a commit point following the completion of the non-recoverable load operation.
With this option, table spaces are not put in backup pending state following the load operation, and a copy of the loaded data does not have to be made during the load operation. If one of COPY NO, COPY YES, or NONRECOVERABLE is not specified, and the database is not recoverable (logretain or logarchmeth1 is not enabled), then NONRECOVERABLE is the default.
From the explanation, impacted database because in non-archive log mode, therefore default is
nonrecoverable option, after enabling archive log, the default behavior is change to
copy no, which would put database/tablespace in backup pending mode.
With customer's environment, they don't want to change the load command. But no worries, there's a db2set registry
DB2_LOAD_COPY_NO_OVERRIDE can achive this.
This registry also have three options that identical to load command:
copy yes and
nonrecoverable, after setting this registry to
nonrecoverable(no instance recycle will be needed), issue is gone.
This registry will be ignored in HADR standby database. Only applicable for primary database.
nonrecvoerable will not recover loaded table from redo log, it's highly recommended to take a full backup after load.