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Improvements to the documentation for SQLITE_PREPARE_PERSISTENT.

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FossilOrigin-Name: 265778142485882f39edfb5756175b2675c1993f0d6395dabbcbbb3767c6ec77
This commit is contained in:
drh 2017-07-13 22:03:34 +00:00
parent 06aecf0954
commit 4ba5f33f39
3 changed files with 16 additions and 14 deletions
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C Fix\sdocumentation\stypo.\s\sNo\schanges\sto\scode.
D 2017-07-13T20:11:52.585
C Improvements\sto\sthe\sdocumentation\sfor\sSQLITE_PREPARE_PERSISTENT.\nNo\scode\schanges.
D 2017-07-13T22:03:34.848
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src/sqlite.h.in
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@ -3492,13 +3492,15 @@ int sqlite3_limit(sqlite3*, int id, int newVal);
**
** <dl>
** [[SQLITE_PREPARE_PERSISTENT]] ^(<dt>SQLITE_PREPARE_PERSISTENT</dt>
** <dd>The SQLITE_PREPARE_PERSISTENT flag causes [sqlite3_prepare_v3()]
** and [sqlite3_prepare16_v3()]
** to optimize the resulting prepared statement to be retained for a
** relatively long amount of time.)^ ^Without this flag,
** [sqlite3_prepare_v3()] and [sqlite3_prepare16_v3()] assume that
** the prepared statement will be used just once or at most a few times
** and then destroyed using [sqlite3_finalize()] relatively soon.
** <dd>The SQLITE_PREPARE_PERSISTENT flag is a hint to the query planner
** that the prepared statement will be retained for a long time and
** probably reused many times. ^Without this flag, [sqlite3_prepare_v3()]
** and [sqlite3_prepare16_v3()] assume that the prepared statement will
** be used just once or at most a few times and then destroyed using
** [sqlite3_finalize()] relatively soon. The current implementation acts
** on this hint by avoiding the use of [lookaside memory] so as not to
** deplete the limited store of lookaside memory. Future versions of
** SQLite may act on this hint differently.
** </dl>
*/
#define SQLITE_PREPARE_PERSISTENT 0x01