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Struct mdbx::env::reader_info

ClassList > mdbx > env > reader_info

Reader information.

• #include <mdbx.h++>

Public Attributes

Type	Name
size_t	bytes_retained
size_t	bytes_used
mdbx_pid_t	pid The reader process ID.
int	slot The reader lock table slot number.
mdbx_tid_t	thread The reader thread ID.
uint64_t	transaction_id
uint64_t	transaction_lag

Public Attributes Documentation

variable bytes_retained

size_t mdbx::env::reader_info::bytes_retained;

The total size of the database pages that were retired by committed write transactions after the reader's MVCC-snapshot, i.e. the space which would be freed after the Reader releases the MVCC-snapshot for reuse by completion read transaction.

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variable bytes_used

size_t mdbx::env::reader_info::bytes_used;

The number of last used page in the MVCC-snapshot which being read, i.e. database file can't be shrunk beyond this.

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variable pid

The reader process ID.

mdbx_pid_t mdbx::env::reader_info::pid;

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variable slot

The reader lock table slot number.

int mdbx::env::reader_info::slot;

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variable thread

The reader thread ID.

mdbx_tid_t mdbx::env::reader_info::thread;

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variable transaction_id

uint64_t mdbx::env::reader_info::transaction_id;

The ID of the transaction being read, i.e. the MVCC-snapshot number.

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variable transaction_lag

uint64_t mdbx::env::reader_info::transaction_lag;

The lag from a recent MVCC-snapshot, i.e. the number of committed write transactions since the current read transaction started.

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The documentation for this class was generated from the following file docs/mdbx.h++