MutableDBOptions.MutableDBOptionsBuilder

java.lang.Object
- org.rocksdb.AbstractMutableOptions.AbstractMutableOptionsBuilder<MutableDBOptions,MutableDBOptions.MutableDBOptionsBuilder,org.rocksdb.MutableDBOptions.MutableDBOptionKey>
- - org.rocksdb.MutableDBOptions.MutableDBOptionsBuilder

所有已实现的接口:: MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>

封闭类:: MutableDBOptions

public static class MutableDBOptions.MutableDBOptionsBuilder
extends AbstractMutableOptions.AbstractMutableOptionsBuilder<MutableDBOptions,MutableDBOptions.MutableDBOptionsBuilder,org.rocksdb.MutableDBOptions.MutableDBOptionKey>
implements MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>

方法概要

所有方法实例方法具体方法已过时的方法
限定符和类型	方法和说明
`protected java.util.Map<java.lang.String,org.rocksdb.MutableDBOptions.MutableDBOptionKey>`	`allKeys()` Get all the possible keys
`boolean`	`avoidFlushDuringShutdown()` By default RocksDB will flush all memtables on DB close if there are unpersisted data (i.e. with WAL disabled) The flush can be skip to speedup DB close.
`protected MutableDBOptions`	`build(java.lang.String[] keys, java.lang.String[] values)` Construct a subclass instance of `AbstractMutableOptions`.
`long`	`bytesPerSync()` Allows OS to incrementally sync files to disk while they are being written, asynchronously, in the background.
`long`	`compactionReadaheadSize()` If non-zero, we perform bigger reads when doing compaction.
`long`	`delayedWriteRate()` The limited write rate to DB if `ColumnFamilyOptions.softPendingCompactionBytesLimit()` or `ColumnFamilyOptions.level0SlowdownWritesTrigger()` is triggered, or we are writing to the last mem table allowed and we allow more than 3 mem tables.
`long`	`deleteObsoleteFilesPeriodMicros()` The periodicity when obsolete files get deleted.
`int`	`maxBackgroundCompactions()` 已过时。
`int`	`maxBackgroundJobs()` Returns the maximum number of concurrent background jobs (both flushes and compactions combined).
`int`	`maxOpenFiles()` Number of open files that can be used by the DB.
`long`	`maxTotalWalSize()` Returns the max total write-ahead log size.
`protected MutableDBOptions.MutableDBOptionsBuilder`	`self()`
`MutableDBOptions.MutableDBOptionsBuilder`	`setAvoidFlushDuringShutdown(boolean avoidFlushDuringShutdown)` By default RocksDB will flush all memtables on DB close if there are unpersisted data (i.e. with WAL disabled) The flush can be skip to speedup DB close.
`MutableDBOptions.MutableDBOptionsBuilder`	`setBytesPerSync(long bytesPerSync)` Allows OS to incrementally sync files to disk while they are being written, asynchronously, in the background.
`MutableDBOptions.MutableDBOptionsBuilder`	`setCompactionReadaheadSize(long compactionReadaheadSize)` If non-zero, we perform bigger reads when doing compaction.
`MutableDBOptions.MutableDBOptionsBuilder`	`setDelayedWriteRate(long delayedWriteRate)` The limited write rate to DB if `ColumnFamilyOptions.softPendingCompactionBytesLimit()` or `ColumnFamilyOptions.level0SlowdownWritesTrigger()` is triggered, or we are writing to the last mem table allowed and we allow more than 3 mem tables.
`MutableDBOptions.MutableDBOptionsBuilder`	`setDeleteObsoleteFilesPeriodMicros(long micros)` The periodicity when obsolete files get deleted.
`MutableDBOptions.MutableDBOptionsBuilder`	`setMaxBackgroundCompactions(int maxBackgroundCompactions)` 已过时。
`MutableDBOptions.MutableDBOptionsBuilder`	`setMaxBackgroundJobs(int maxBackgroundJobs)` Specifies the maximum number of concurrent background jobs (both flushes and compactions combined).
`MutableDBOptions.MutableDBOptionsBuilder`	`setMaxOpenFiles(int maxOpenFiles)` Number of open files that can be used by the DB.
`MutableDBOptions.MutableDBOptionsBuilder`	`setMaxTotalWalSize(long maxTotalWalSize)` Set the max total write-ahead log size.
`MutableDBOptions.MutableDBOptionsBuilder`	`setStatsDumpPeriodSec(int statsDumpPeriodSec)` if not zero, dump rocksdb.stats to LOG every stats_dump_period_sec Default: 600 (10 minutes)
`MutableDBOptions.MutableDBOptionsBuilder`	`setStatsHistoryBufferSize(long statsHistoryBufferSize)` If not zero, periodically take stats snapshots and store in memory, the memory size for stats snapshots is capped at `statsHistoryBufferSize` Default: 1MB
`MutableDBOptions.MutableDBOptionsBuilder`	`setStatsPersistPeriodSec(int statsPersistPeriodSec)` If not zero, dump rocksdb.stats to RocksDB every `statsPersistPeriodSec` Default: 600
`MutableDBOptions.MutableDBOptionsBuilder`	`setStrictBytesPerSync(boolean strictBytesPerSync)` When true, guarantees WAL files have at most `MutableDBOptionsInterface.walBytesPerSync()` bytes submitted for writeback at any given time, and SST files have at most `MutableDBOptionsInterface.bytesPerSync()` bytes pending writeback at any given time.
`MutableDBOptions.MutableDBOptionsBuilder`	`setWalBytesPerSync(long walBytesPerSync)` Same as `MutableDBOptionsInterface.setBytesPerSync(long)` , but applies to WAL files Default: 0, turned off
`MutableDBOptions.MutableDBOptionsBuilder`	`setWritableFileMaxBufferSize(long writableFileMaxBufferSize)` This is the maximum buffer size that is used by WritableFileWriter.
`int`	`statsDumpPeriodSec()` If not zero, dump rocksdb.stats to LOG every stats_dump_period_sec Default: 600 (10 minutes)
`long`	`statsHistoryBufferSize()` If not zero, periodically take stats snapshots and store in memory, the memory size for stats snapshots is capped at `statsHistoryBufferSize`
`int`	`statsPersistPeriodSec()` If not zero, dump rocksdb.stats to RocksDB every `statsPersistPeriodSec`
`boolean`	`strictBytesPerSync()` Return the strict byte limit per sync.
`long`	`walBytesPerSync()` Same as `MutableDBOptionsInterface.bytesPerSync()` , but applies to WAL files Default: 0, turned off
`long`	`writableFileMaxBufferSize()` This is the maximum buffer size that is used by WritableFileWriter.

从类继承的方法 org.rocksdb.AbstractMutableOptions.AbstractMutableOptionsBuilder
build, fromParsed, getBoolean, getDouble, getEnum, getInt, getIntArray, getLong, getUnknown, setBoolean, setDouble, setEnum, setInt, setIntArray, setLong

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 方法详细资料
  - self
```
protected MutableDBOptions.MutableDBOptionsBuilder self()
```
    指定者:
    
    self 在类中 AbstractMutableOptions.AbstractMutableOptionsBuilder<MutableDBOptions,MutableDBOptions.MutableDBOptionsBuilder,org.rocksdb.MutableDBOptions.MutableDBOptionKey>
  - allKeys
```
protected java.util.Map<java.lang.String,org.rocksdb.MutableDBOptions.MutableDBOptionKey> allKeys()
```
    从类复制的说明: AbstractMutableOptions.AbstractMutableOptionsBuilder
    
    Get all the possible keys
    
    指定者:
    
    allKeys 在类中 AbstractMutableOptions.AbstractMutableOptionsBuilder<MutableDBOptions,MutableDBOptions.MutableDBOptionsBuilder,org.rocksdb.MutableDBOptions.MutableDBOptionKey>
    
    返回:
    
    A map of all keys, indexed by name.
  - build
```
protected MutableDBOptions build(java.lang.String[] keys,
                                 java.lang.String[] values)
```
    从类复制的说明: AbstractMutableOptions.AbstractMutableOptionsBuilder
    
    Construct a subclass instance of AbstractMutableOptions.
    
    指定者:
    
    build 在类中 AbstractMutableOptions.AbstractMutableOptionsBuilder<MutableDBOptions,MutableDBOptions.MutableDBOptionsBuilder,org.rocksdb.MutableDBOptions.MutableDBOptionKey>
    
    参数:
    
    keys - the keys
    
    values - the values
    
    返回:
    
    an instance of the options.
  - setMaxBackgroundJobs
```
public MutableDBOptions.MutableDBOptionsBuilder setMaxBackgroundJobs(int maxBackgroundJobs)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    Specifies the maximum number of concurrent background jobs (both flushes and compactions combined). Default: 2
    
    指定者:
    
    setMaxBackgroundJobs 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    maxBackgroundJobs - number of max concurrent background jobs
    
    返回:
    
    the instance of the current object.
  - maxBackgroundJobs
```
public int maxBackgroundJobs()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    Returns the maximum number of concurrent background jobs (both flushes and compactions combined). Default: 2
    
    指定者:
    
    maxBackgroundJobs 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    the maximum number of concurrent background jobs.
  - setMaxBackgroundCompactions
```
@Deprecated
public MutableDBOptions.MutableDBOptionsBuilder setMaxBackgroundCompactions(int maxBackgroundCompactions)
```
    已过时。
    
    从接口复制的说明: MutableDBOptionsInterface
    
    NOT SUPPORTED ANYMORE: RocksDB automatically decides this based on the value of max_background_jobs. For backwards compatibility we will set `max_background_jobs = max_background_compactions + max_background_flushes` in the case where user sets at least one of `max_background_compactions` or `max_background_flushes` (we replace -1 by 1 in case one option is unset).
    Specifies the maximum number of concurrent background compaction jobs, submitted to the default LOW priority thread pool. If you're increasing this, also consider increasing number of threads in LOW priority thread pool. For more information, see Default: -1
    
    指定者:
    
    setMaxBackgroundCompactions 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    maxBackgroundCompactions - the maximum number of background compaction jobs.
    
    返回:
    
    the instance of the current object.
    
    另请参阅:
    
    Env.setBackgroundThreads(int), Env.setBackgroundThreads(int, Priority), DBOptionsInterface.maxBackgroundFlushes()
  - maxBackgroundCompactions
```
@Deprecated
public int maxBackgroundCompactions()
```
    已过时。
    
    从接口复制的说明: MutableDBOptionsInterface
    
    NOT SUPPORTED ANYMORE: RocksDB automatically decides this based on the value of max_background_jobs. For backwards compatibility we will set `max_background_jobs = max_background_compactions + max_background_flushes` in the case where user sets at least one of `max_background_compactions` or `max_background_flushes` (we replace -1 by 1 in case one option is unset).
    Returns the maximum number of concurrent background compaction jobs, submitted to the default LOW priority thread pool. When increasing this number, we may also want to consider increasing number of threads in LOW priority thread pool. Default: -1
    
    指定者:
    
    maxBackgroundCompactions 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    the maximum number of concurrent background compaction jobs.
    
    另请参阅:
    
    Env.setBackgroundThreads(int), Env.setBackgroundThreads(int, Priority)
  - setAvoidFlushDuringShutdown
```
public MutableDBOptions.MutableDBOptionsBuilder setAvoidFlushDuringShutdown(boolean avoidFlushDuringShutdown)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    By default RocksDB will flush all memtables on DB close if there are unpersisted data (i.e. with WAL disabled) The flush can be skip to speedup DB close. Unpersisted data WILL BE LOST.
    DEFAULT: false
    Dynamically changeable through RocksDB.setOptions(ColumnFamilyHandle, MutableColumnFamilyOptions) API.
    
    指定者:
    
    setAvoidFlushDuringShutdown 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    avoidFlushDuringShutdown - true if we should avoid flush during shutdown
    
    返回:
    
    the reference to the current options.
  - avoidFlushDuringShutdown
```
public boolean avoidFlushDuringShutdown()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    By default RocksDB will flush all memtables on DB close if there are unpersisted data (i.e. with WAL disabled) The flush can be skip to speedup DB close. Unpersisted data WILL BE LOST.
    DEFAULT: false
    Dynamically changeable through RocksDB.setOptions(ColumnFamilyHandle, MutableColumnFamilyOptions) API.
    
    指定者:
    
    avoidFlushDuringShutdown 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    true if we should avoid flush during shutdown
  - setWritableFileMaxBufferSize
```
public MutableDBOptions.MutableDBOptionsBuilder setWritableFileMaxBufferSize(long writableFileMaxBufferSize)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    This is the maximum buffer size that is used by WritableFileWriter. On Windows, we need to maintain an aligned buffer for writes. We allow the buffer to grow until it's size hits the limit.
    Default: 1024 * 1024 (1 MB)
    
    指定者:
    
    setWritableFileMaxBufferSize 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    writableFileMaxBufferSize - the maximum buffer size
    
    返回:
    
    the reference to the current options.
  - writableFileMaxBufferSize
```
public long writableFileMaxBufferSize()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    This is the maximum buffer size that is used by WritableFileWriter. On Windows, we need to maintain an aligned buffer for writes. We allow the buffer to grow until it's size hits the limit.
    Default: 1024 * 1024 (1 MB)
    
    指定者:
    
    writableFileMaxBufferSize 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    the maximum buffer size
  - setDelayedWriteRate
```
public MutableDBOptions.MutableDBOptionsBuilder setDelayedWriteRate(long delayedWriteRate)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    The limited write rate to DB if ColumnFamilyOptions.softPendingCompactionBytesLimit() or ColumnFamilyOptions.level0SlowdownWritesTrigger() is triggered, or we are writing to the last mem table allowed and we allow more than 3 mem tables. It is calculated using size of user write requests before compression. RocksDB may decide to slow down more if the compaction still gets behind further. If the value is 0, we will infer a value from `rater_limiter` value if it is not empty, or 16MB if `rater_limiter` is empty. Note that if users change the rate in `rate_limiter` after DB is opened, `delayed_write_rate` won't be adjusted.
    Unit: bytes per second.
    Default: 0
    Dynamically changeable through RocksDB.setDBOptions(MutableDBOptions).
    
    指定者:
    
    setDelayedWriteRate 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    delayedWriteRate - the rate in bytes per second
    
    返回:
    
    the reference to the current options.
  - delayedWriteRate
```
public long delayedWriteRate()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    The limited write rate to DB if ColumnFamilyOptions.softPendingCompactionBytesLimit() or ColumnFamilyOptions.level0SlowdownWritesTrigger() is triggered, or we are writing to the last mem table allowed and we allow more than 3 mem tables. It is calculated using size of user write requests before compression. RocksDB may decide to slow down more if the compaction still gets behind further. If the value is 0, we will infer a value from `rater_limiter` value if it is not empty, or 16MB if `rater_limiter` is empty. Note that if users change the rate in `rate_limiter` after DB is opened, `delayed_write_rate` won't be adjusted.
    Unit: bytes per second.
    Default: 0
    Dynamically changeable through RocksDB.setDBOptions(MutableDBOptions).
    
    指定者:
    
    delayedWriteRate 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    the rate in bytes per second
  - setMaxTotalWalSize
```
public MutableDBOptions.MutableDBOptionsBuilder setMaxTotalWalSize(long maxTotalWalSize)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    Set the max total write-ahead log size. Once write-ahead logs exceed this size, we will start forcing the flush of column families whose memtables are backed by the oldest live WAL file
    
    The oldest WAL files are the ones that are causing all the space amplification.
    For example, with 15 column families, each with write_buffer_size = 128 MB max_write_buffer_number = 6 max_total_wal_size will be calculated to be [15 * 128MB * 6] * 4 = 45GB
    The RocksDB wiki has some discussion about how the WAL interacts with memtables and flushing of column families, at ...
    
    If set to 0 (default), we will dynamically choose the WAL size limit to be [sum of all write_buffer_size * max_write_buffer_number] * 4
    
    This option takes effect only when there are more than one column family as otherwise the wal size is dictated by the write_buffer_size.
    
    Default: 0
    
    指定者:
    
    setMaxTotalWalSize 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    maxTotalWalSize - max total wal size.
    
    返回:
    
    the instance of the current object.
  - maxTotalWalSize
```
public long maxTotalWalSize()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    Returns the max total write-ahead log size. Once write-ahead logs exceed this size, we will start forcing the flush of column families whose memtables are backed by the oldest live WAL file.
    
    The oldest WAL files are the ones that are causing all the space amplification.
    For example, with 15 column families, each with write_buffer_size = 128 MB max_write_buffer_number = 6 max_total_wal_size will be calculated to be [15 * 128MB * 6] * 4 = 45GB
    The RocksDB wiki has some discussion about how the WAL interacts with memtables and flushing of column families, at ...
    
    If set to 0 (default), we will dynamically choose the WAL size limit to be [sum of all write_buffer_size * max_write_buffer_number] * 4
    
    This option takes effect only when there are more than one column family as otherwise the wal size is dictated by the write_buffer_size.
    
    Default: 0
    
    If set to 0 (default), we will dynamically choose the WAL size limit to be [sum of all write_buffer_size * max_write_buffer_number] * 4
    
    指定者:
    
    maxTotalWalSize 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    max total wal size
  - setDeleteObsoleteFilesPeriodMicros
```
public MutableDBOptions.MutableDBOptionsBuilder setDeleteObsoleteFilesPeriodMicros(long micros)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    The periodicity when obsolete files get deleted. The default value is 6 hours. The files that get out of scope by compaction process will still get automatically delete on every compaction, regardless of this setting
    
    指定者:
    
    setDeleteObsoleteFilesPeriodMicros 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    micros - the time interval in micros
    
    返回:
    
    the instance of the current object.
  - deleteObsoleteFilesPeriodMicros
```
public long deleteObsoleteFilesPeriodMicros()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    The periodicity when obsolete files get deleted. The default value is 6 hours. The files that get out of scope by compaction process will still get automatically delete on every compaction, regardless of this setting
    
    指定者:
    
    deleteObsoleteFilesPeriodMicros 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    the time interval in micros when obsolete files will be deleted.
  - setStatsDumpPeriodSec
```
public MutableDBOptions.MutableDBOptionsBuilder setStatsDumpPeriodSec(int statsDumpPeriodSec)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    if not zero, dump rocksdb.stats to LOG every stats_dump_period_sec Default: 600 (10 minutes)
    
    指定者:
    
    setStatsDumpPeriodSec 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    statsDumpPeriodSec - time interval in seconds.
    
    返回:
    
    the instance of the current object.
  - statsDumpPeriodSec
```
public int statsDumpPeriodSec()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    If not zero, dump rocksdb.stats to LOG every stats_dump_period_sec Default: 600 (10 minutes)
    
    指定者:
    
    statsDumpPeriodSec 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    time interval in seconds.
  - setStatsPersistPeriodSec
```
public MutableDBOptions.MutableDBOptionsBuilder setStatsPersistPeriodSec(int statsPersistPeriodSec)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    If not zero, dump rocksdb.stats to RocksDB every statsPersistPeriodSec Default: 600
    
    指定者:
    
    setStatsPersistPeriodSec 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    statsPersistPeriodSec - time interval in seconds.
    
    返回:
    
    the instance of the current object.
  - statsPersistPeriodSec
```
public int statsPersistPeriodSec()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    If not zero, dump rocksdb.stats to RocksDB every statsPersistPeriodSec
    
    指定者:
    
    statsPersistPeriodSec 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    time interval in seconds.
  - setStatsHistoryBufferSize
```
public MutableDBOptions.MutableDBOptionsBuilder setStatsHistoryBufferSize(long statsHistoryBufferSize)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    If not zero, periodically take stats snapshots and store in memory, the memory size for stats snapshots is capped at statsHistoryBufferSize Default: 1MB
    
    指定者:
    
    setStatsHistoryBufferSize 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    statsHistoryBufferSize - the size of the buffer.
    
    返回:
    
    the instance of the current object.
  - statsHistoryBufferSize
```
public long statsHistoryBufferSize()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    If not zero, periodically take stats snapshots and store in memory, the memory size for stats snapshots is capped at statsHistoryBufferSize
    
    指定者:
    
    statsHistoryBufferSize 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    the size of the buffer.
  - setMaxOpenFiles
```
public MutableDBOptions.MutableDBOptionsBuilder setMaxOpenFiles(int maxOpenFiles)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    Number of open files that can be used by the DB. You may need to increase this if your database has a large working set. Value -1 means files opened are always kept open. You can estimate number of files based on target_file_size_base and target_file_size_multiplier for level-based compaction. For universal-style compaction, you can usually set it to -1. Default: -1
    
    指定者:
    
    setMaxOpenFiles 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    maxOpenFiles - the maximum number of open files.
    
    返回:
    
    the instance of the current object.
  - maxOpenFiles
```
public int maxOpenFiles()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    Number of open files that can be used by the DB. You may need to increase this if your database has a large working set. Value -1 means files opened are always kept open. You can estimate number of files based on target_file_size_base and target_file_size_multiplier for level-based compaction. For universal-style compaction, you can usually set it to -1. Default: -1
    
    指定者:
    
    maxOpenFiles 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    the maximum number of open files.
  - setBytesPerSync
```
public MutableDBOptions.MutableDBOptionsBuilder setBytesPerSync(long bytesPerSync)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    Allows OS to incrementally sync files to disk while they are being written, asynchronously, in the background. Issue one request for every bytes_per_sync written. 0 turns it off. Default: 0
    
    指定者:
    
    setBytesPerSync 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    bytesPerSync - size in bytes
    
    返回:
    
    the instance of the current object.
  - bytesPerSync
```
public long bytesPerSync()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    Allows OS to incrementally sync files to disk while they are being written, asynchronously, in the background. Issue one request for every bytes_per_sync written. 0 turns it off. Default: 0
    
    指定者:
    
    bytesPerSync 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    size in bytes
  - setWalBytesPerSync
```
public MutableDBOptions.MutableDBOptionsBuilder setWalBytesPerSync(long walBytesPerSync)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    Same as MutableDBOptionsInterface.setBytesPerSync(long) , but applies to WAL files
    Default: 0, turned off
    
    指定者:
    
    setWalBytesPerSync 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    walBytesPerSync - size in bytes
    
    返回:
    
    the instance of the current object.
  - walBytesPerSync
```
public long walBytesPerSync()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    Same as MutableDBOptionsInterface.bytesPerSync() , but applies to WAL files
    Default: 0, turned off
    
    指定者:
    
    walBytesPerSync 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    size in bytes
  - setStrictBytesPerSync
```
public MutableDBOptions.MutableDBOptionsBuilder setStrictBytesPerSync(boolean strictBytesPerSync)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    When true, guarantees WAL files have at most MutableDBOptionsInterface.walBytesPerSync() bytes submitted for writeback at any given time, and SST files have at most MutableDBOptionsInterface.bytesPerSync() bytes pending writeback at any given time. This can be used to handle cases where processing speed exceeds I/O speed during file generation, which can lead to a huge sync when the file is finished, even with MutableDBOptionsInterface.bytesPerSync() / MutableDBOptionsInterface.walBytesPerSync() properly configured.
    - If `sync_file_range` is supported it achieves this by waiting for any prior `sync_file_range`s to finish before proceeding. In this way, processing (compression, etc.) can proceed uninhibited in the gap between `sync_file_range`s, and we block only when I/O falls behind. - Otherwise the `WritableFile::Sync` method is used. Note this mechanism always blocks, thus preventing the interleaving of I/O and processing.
    Note: Enabling this option does not provide any additional persistence guarantees, as it may use `sync_file_range`, which does not write out metadata.
    Default: false
    
    指定者:
    
    setStrictBytesPerSync 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    strictBytesPerSync - the bytes per sync
    
    返回:
    
    the instance of the current object.
  - strictBytesPerSync
```
public boolean strictBytesPerSync()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    Return the strict byte limit per sync.
    See MutableDBOptionsInterface.setStrictBytesPerSync(boolean)
    
    指定者:
    
    strictBytesPerSync 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    the limit in bytes.
  - setCompactionReadaheadSize
```
public MutableDBOptions.MutableDBOptionsBuilder setCompactionReadaheadSize(long compactionReadaheadSize)
```
    从接口复制的说明: MutableDBOptionsInterface
    
    If non-zero, we perform bigger reads when doing compaction. If you're running RocksDB on spinning disks, you should set this to at least 2MB.
    That way RocksDB's compaction is doing sequential instead of random reads.
    Default: 0
    
    指定者:
    
    setCompactionReadaheadSize 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    参数:
    
    compactionReadaheadSize - The compaction read-ahead size
    
    返回:
    
    the reference to the current options.
  - compactionReadaheadSize
```
public long compactionReadaheadSize()
```
    从接口复制的说明: MutableDBOptionsInterface
    
    If non-zero, we perform bigger reads when doing compaction. If you're running RocksDB on spinning disks, you should set this to at least 2MB.
    That way RocksDB's compaction is doing sequential instead of random reads.
    Default: 0
    
    指定者:
    
    compactionReadaheadSize 在接口中 MutableDBOptionsInterface<MutableDBOptions.MutableDBOptionsBuilder>
    
    返回:
    
    The compaction read-ahead size

类 MutableDBOptions.MutableDBOptionsBuilder

方法概要

从类继承的方法 org.rocksdb.AbstractMutableOptions.AbstractMutableOptionsBuilder

从类继承的方法 java.lang.Object

方法详细资料

self

allKeys

build

setMaxBackgroundJobs

maxBackgroundJobs

setMaxBackgroundCompactions

maxBackgroundCompactions

setAvoidFlushDuringShutdown

avoidFlushDuringShutdown

setWritableFileMaxBufferSize

writableFileMaxBufferSize

setDelayedWriteRate

delayedWriteRate

setMaxTotalWalSize

maxTotalWalSize

setDeleteObsoleteFilesPeriodMicros

deleteObsoleteFilesPeriodMicros

setStatsDumpPeriodSec

statsDumpPeriodSec

setStatsPersistPeriodSec

statsPersistPeriodSec

setStatsHistoryBufferSize

statsHistoryBufferSize

setMaxOpenFiles

maxOpenFiles

setBytesPerSync

bytesPerSync

setWalBytesPerSync

walBytesPerSync

setStrictBytesPerSync

strictBytesPerSync

setCompactionReadaheadSize

compactionReadaheadSize