SQLITE_STMTSTATUS_FULLSCAN_STEP
,
SQLITE_STMTSTATUS_SORT
,
SQLITE_STMTSTATUS_AUTOINDEX
,
SQLITE_STMTSTATUS_VM_STEP
,
SQLITE_STMTSTATUS_REPREPARE
,
SQLITE_STMTSTATUS_RUN
,
SQLITE_STMTSTATUS_MEMUSED
—
Status Parameters for prepared statements
#define SQLITE_STMTSTATUS_FULLSCAN_STEP
#define SQLITE_STMTSTATUS_SORT
#define SQLITE_STMTSTATUS_AUTOINDEX
#define SQLITE_STMTSTATUS_VM_STEP
#define SQLITE_STMTSTATUS_REPREPARE
#define SQLITE_STMTSTATUS_RUN
#define SQLITE_STMTSTATUS_MEMUSED
These preprocessor macros define integer codes that name counter values
associated with the sqlite3_stmt_status() interface. The meanings of the
various counters are as follows:
- SQLITE_STMTSTATUS_FULLSCAN_STEP
- This is the number of times that SQLite has stepped forward in a table as
part of a full table scan. Large numbers for this counter may indicate
opportunities for performance improvement through careful use of
indices.
- SQLITE_STMTSTATUS_SORT
- This is the number of sort operations that have occurred. A non-zero value
in this counter may indicate an opportunity to improvement performance
through careful use of indices.
- SQLITE_STMTSTATUS_AUTOINDEX
- This is the number of rows inserted into transient indices that were
created automatically in order to help joins run faster. A non-zero value
in this counter may indicate an opportunity to improvement performance by
adding permanent indices that do not need to be reinitialized each time
the statement is run.
- SQLITE_STMTSTATUS_VM_STEP
- This is the number of virtual machine operations executed by the prepared
statement if that number is less than or equal to 2147483647. The number
of virtual machine operations can be used as a proxy for the total work
done by the prepared statement. If the number of virtual machine
operations exceeds 2147483647 then the value returned by this statement
status code is undefined.
- SQLITE_STMTSTATUS_REPREPARE
- This is the number of times that the prepare statement has been
automatically regenerated due to schema changes or change to bound
parameters that might affect the query plan.
- SQLITE_STMTSTATUS_RUN
- This is the number of times that the prepared statement has been run. A
single "run" for the purposes of this counter is one or more
calls to sqlite3_step() followed by a call to sqlite3_reset(). The counter
is incremented on the first sqlite3_step() call of each cycle.
- SQLITE_STMTSTATUS_MEMUSED
- This is the approximate number of bytes of heap memory used to store the
prepared statement. This value is not actually a counter, and so the
resetFlg parameter to sqlite3_stmt_status() is ignored when the opcode is
SQLITE_STMTSTATUS_MEMUSED.