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Berkeley DB: DbEnv::txn_stat
DbEnv::txn_stat
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#include <db_cxx.h>
int
DbEnv::txn_stat(DB_TXN_STAT **statp);
Description
The DbEnv::txn_stat method
creates a statistical structure and copies a pointer to it into a
user-specified memory location.
Statistical structures are created in allocated memory. If application-specific allocation
routines have been declared (see DbEnv::set_alloc for more
information), they are used to allocate the memory; otherwise, the
library function malloc(3) is used. The caller is
responsible for deallocating the memory. To deallocate the memory, free
the memory reference; references inside the returned memory need not be
individually freed.
The transaction region statistics are stored in a structure of type
DB_TXN_STAT. The following DB_TXN_STAT fields will be filled in:
- DbLsn st_last_ckp;
- The LSN of the last checkpoint.
- 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.
- time_t 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).
- u_int32_t st_last_txnid;
- The last transaction ID allocated.
- u_int32_t st_maxtxns;
- The maximum number of active transactions possible.
- u_int32_t st_nactive;
- The number of transactions that are currently active.
- u_int32_t st_maxnactive;
- The maximum number of active transactions at any one time.
- u_int32_t st_nbegins;
- The number of transactions that have begun.
- u_int32_t st_naborts;
- The number of transactions that have aborted.
- u_int32_t st_ncommits;
- The number of transactions that have committed.
- u_int32_t st_regsize;
- The size of the region.
- u_int32_t st_region_wait;
- The number of times that a thread of control was forced to wait before
obtaining the region lock.
- u_int32_t st_region_nowait;
- The number of times that a thread of control was able to obtain
the region lock without waiting.
- DB_TXN_ACTIVE * st_txnarray;
- A pointer to an array of st_nactive DB_TXN_ACTIVE structures,
describing the currently active transactions. The following fields of
the DB_TXN_ACTIVE structure will be filled in:
- u_int32_t txnid;
- The transaction ID of the transaction.
- u_int32_t parentid;
- The transaction ID of the parent transaction (or 0, if no parent).
- DbLsn lsn;
- The log sequence number of the transaction-begin record.
The DbEnv::txn_stat method either returns a non-zero error value or throws an exception that
encapsulates a non-zero error value on failure, and returns 0 on success.
Errors
The DbEnv::txn_stat method may fail and throw an exception or return a non-zero error 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 either
return DB_RUNRECOVERY or throw an exception encapsulating
DB_RUNRECOVERY, 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_recover,
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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1.1.1.2
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DbEnv::txn_stat(DB_TXN_STAT **statp, u_int32_t flags);
a30 5
The flags value must be set to 0 or
the following value:
- DB_STAT_CLEAR
- Reset statistics after returning their values.
a53 1
u_int32_t st_nrestores;The number of transactions that have been restored.
a89 1
DbTxn::set_timeout
d94 1
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The DbEnv::txn_stat method returns the transaction subsystem statistics.
a35 3
The DbEnv::txn_stat method creates a statistical structure of type
DB_TXN_STAT and copies a pointer to it into a user-specified memory
location.
d39 1
a39 1
library malloc(3) interface is used. The caller is
d43 2
a44 1
The following DB_TXN_STAT fields will be filled in:
d47 3
d65 1
a65 1
DB_TXN_ACTIVE *st_txnarray;A pointer to an array of st_nactive DB_TXN_ACTIVE structures,
d71 1
a71 1
DbLsn lsn;The current log sequence number when the transaction was begun.
d78 4
a81 4
If a catastrophic error has occurred, the DbEnv::txn_stat method may fail and
either return DB_RUNRECOVERY or throw a
DbRunRecoveryException,
in which case all subsequent Berkeley DB calls will fail in the same way.
d83 1
a83 1
DbEnv, DbTxn
d85 14
a98 1
Transaction Subsystem and Related Methods
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1.1.1.4
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@Import: RPM 4.1
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@d1 2
a2 2
d4 1
d29 1
a29 3
The DbEnv::txn_stat method
creates a statistical structure and copies a pointer to it into a
user-specified memory location.
d35 3
d41 1
a41 1
library function malloc(3) is used. The caller is
d45 1
a45 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:
a47 3
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.
d63 1
a63 1
DB_TXN_ACTIVE * st_txnarray;A pointer to an array of st_nactive DB_TXN_ACTIVE structures,
d69 1
a69 1
DbLsn lsn;The log sequence number of the transaction-begin record.
d76 4
a79 4
If a catastrophic error has occurred, the DbEnv::txn_stat method may fail and either
return DB_RUNRECOVERY or throw an exception encapsulating
DB_RUNRECOVERY, in which case all subsequent Berkeley DB calls will fail
in the same way.
d81 1
a81 1
DbEnv, DbTxn
d83 1
a83 14
DbEnv::set_tx_max,
DbEnv::set_tx_recover,
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.
@
1.1.1.5
log
@Import: RPM 4.1.1
@
text
@d1 2
a2 2
a3 1
d28 3
a30 1
The DbEnv::txn_stat method returns the transaction subsystem statistics.
a35 3
The DbEnv::txn_stat method creates a statistical structure of type
DB_TXN_STAT and copies a pointer to it into a user-specified memory
location.
d39 1
a39 1
library malloc(3) interface is used. The caller is
d43 2
a44 1
The following DB_TXN_STAT fields will be filled in:
d47 3
d65 1
a65 1
DB_TXN_ACTIVE *st_txnarray;A pointer to an array of st_nactive DB_TXN_ACTIVE structures,
d71 1
a71 1
DbLsn lsn;The current log sequence number when the transaction was begun.
d78 4
a81 4
If a catastrophic error has occurred, the DbEnv::txn_stat method may fail and
either return DB_RUNRECOVERY or throw a
DbRunRecoveryException,
in which case all subsequent Berkeley DB calls will fail in the same way.
d83 1
a83 1
DbEnv, DbTxn
d85 14
a98 1
Transaction Subsystem and Related Methods
@