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Berkeley DB: DbEnv.txn_stat
DbEnv.txn_stat
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import com.sleepycat.db.*;
public DbTxnStat txn_stat()
throws DbException;
Description
The DbEnv.txn_stat method
creates a DbTxnStat object encapsulating a statistical structure.
The transaction region statistics are stored in a DbTxnStat object.
The following data fields are available from the DbTxnStat object:
The transaction region statistics are stored in a structure of type
DB_TXN_STAT. The following DB_TXN_STAT fields will be filled in:
- public DbLsn st_last_ckp;
- The LSN of the last checkpoint.
- public DbLsn st_pending_ckp;
- The LSN of any checkpoint that is currently in progress. If
st_pending_ckp is the same as st_last_ckp there
is no checkpoint in progress.
- public long st_time_ckp;
- The time the last completed checkpoint finished (as the number of seconds
since the Epoch, returned by the IEEE/ANSI Std 1003.1 (POSIX) time interface).
- public int st_last_txnid;
- The last transaction ID allocated.
- public int st_maxtxns;
- The maximum number of active transactions possible.
- public int st_nactive;
- The number of transactions that are currently active.
- public int st_maxnactive;
- The maximum number of active transactions at any one time.
- public int st_nbegins;
- The number of transactions that have begun.
- public int st_naborts;
- The number of transactions that have aborted.
- public int st_ncommits;
- The number of transactions that have committed.
- public int st_regsize;
- The size of the region.
- public int st_region_wait;
- The number of times that a thread of control was forced to wait before
obtaining the region lock.
- public int st_region_nowait;
- The number of times that a thread of control was able to obtain
the region lock without waiting.
- public Active st_txnarray[];
- The array of active transactions. Each element of the array is an object
of type DbTxnStat.Active, a top level inner class, that has the following
fields:
- public int txnid;
- The Transaction ID.
- public DbLsn lsn;
- The Lsn of the begin record.
The DbEnv.txn_stat method throws an exception that encapsulates a non-zero error value on
failure.
Errors
The DbEnv.txn_stat method may fail and throw an exception for errors specified for other Berkeley DB and C library or system methods.
If a catastrophic error has occurred, the DbEnv.txn_stat method may fail and throw
a DbRunRecoveryException, in which case all subsequent Berkeley DB calls
will fail in the same way.
Class
DbEnv, DbTxn
See Also
DbEnv.set_tx_max,
DbEnv.set_tx_timestamp,
DbTxn.abort,
DbEnv.txn_begin,
DbEnv.txn_checkpoint,
DbTxn.commit,
DbTxn.discard,
DbTxn.id,
DbTxn.prepare,
DbEnv.txn_recover,
and
DbEnv.txn_stat.
Copyright Sleepycat Software
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public DbTxnStat txn_stat(int flags)
throws DbException;
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The flags value must be set to 0 or
the following value:
- Db.DB_STAT_CLEAR
- Reset statistics after returning their values.
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public int st_nrestores;The number of transactions that have been restored.
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DbTxn.set_timeout
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The DbEnv.txn_stat method returns the transaction subsystem statistics.
d37 2
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The DbEnv.txn_stat method creates a DbTxnStat object encapsulating the
transaction region statistics. The following data fields are available
from the DbTxnStat object:
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public int txnid;The transaction ID of the transaction.
public int parentid;The transaction ID of the parent transaction (or 0, if no parent).
public DbLsn lsn;The current log sequence number when the transaction was begun.
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If a catastrophic error has occurred, the DbEnv.txn_stat method may fail and
throw a DbRunRecoveryException,
in which case all subsequent Berkeley DB calls will fail in the same way.
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DbEnv, DbTxn
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Transaction Subsystem and Related Methods
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The DbEnv.txn_stat method
creates a DbTxnStat object encapsulating a statistical structure.
The transaction region statistics are stored in a DbTxnStat object.
The following data fields are available from the DbTxnStat object:
d35 3
a37 2
The transaction region statistics are stored in a structure of type
DB_TXN_STAT. The following DB_TXN_STAT fields will be filled in:
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public DbLsn st_pending_ckp;The LSN of any checkpoint that is currently in progress. If
st_pending_ckp is the same as st_last_ckp there
is no checkpoint in progress.
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public int txnid;The Transaction ID.
public DbLsn lsn;The Lsn of the begin record.
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If a catastrophic error has occurred, the DbEnv.txn_stat method may fail and throw
a DbRunRecoveryException, in which case all subsequent Berkeley DB calls
will fail in the same way.
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DbEnv, DbTxn
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DbEnv.set_tx_max,
DbEnv.set_tx_timestamp,
DbTxn.abort,
DbEnv.txn_begin,
DbEnv.txn_checkpoint,
DbTxn.commit,
DbTxn.discard,
DbTxn.id,
DbTxn.prepare,
DbEnv.txn_recover,
DbTxn.set_timeout
and
DbEnv.txn_stat.
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The DbEnv.txn_stat method returns the transaction subsystem statistics.
d37 2
a38 3
The DbEnv.txn_stat method creates a DbTxnStat object encapsulating the
transaction region statistics. The following data fields are available
from the DbTxnStat object:
d41 3
d63 2
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public int txnid;The transaction ID of the transaction.
public int parentid;The transaction ID of the parent transaction (or 0, if no parent).
public DbLsn lsn;The current log sequence number when the transaction was begun.
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If a catastrophic error has occurred, the DbEnv.txn_stat method may fail and
throw a DbRunRecoveryException,
in which case all subsequent Berkeley DB calls will fail in the same way.
d75 1
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DbEnv, DbTxn
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Transaction Subsystem and Related Methods
@