Berkeley DB: DbEnv::memp_trickle
Description: Berkeley DB: An embedded database programmatic toolkit.
Keywords: embedded,database,programmatic,toolkit,btree,hash,hashing,transaction,transactions,locking,logging,access method,access methods,Java,C,C++

### DbEnv::memp_trickle |

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###

    #include <db_cxx.h>

    int
    DbEnv::memp_trickle(int percent, int *nwrotep);

### Description: DbEnv::memp_trickle

The DbEnv::memp_trickle method ensures that a specified percent of the pages in the shared memory pool are clean, by writing dirty pages to their backing files.

The purpose of the DbEnv::memp_trickle function is to enable a memory pool manager to ensure that a page is always available for reading in new information without having to wait for a write.

The DbEnv::memp_trickle 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.

### Parameters

nwrotep
  The nwrotep parameter references memory into which the number of pages written to reach the specified percentage is copied.
percent
  The percent parameter is the percent of the pages in the cache that should be clean.

### Errors

The DbEnv::memp_trickle method may fail and throw DbException, encapsulating one of the following non-zero errors, or return one of the following non-zero errors:

EINVAL
  An invalid flag value or parameter was specified.

### Class

DbEnv, DbMpoolFile

### See Also

Memory Pools and Related Methods`

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