SQLite

Check-in [9351135b43]
Login

Many hyperlinks are disabled.
Use anonymous login to enable hyperlinks.

Overview
Comment:Enhancements to sqlite_memstat: (1) Add an extra "schema" column to show the schema name for ZIPVFS stats. (2) Only show ZIPVFS stats to schema that use ZIPVFS (3) Put a NULL in unused columns of the output.
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | memstat-vtab
Files: files | file ages | folders
SHA3-256: 9351135b4331107be2f2bda7b6adbd5436381f4f9a68340e8a172b6517ec3f12
User & Date: drh 2018-09-27 16:57:42.381
Context
2018-09-27
17:03
Add the sqlite_memstat extension - an eponymous virtual table that shows memory usages statistics for SQLite. (check-in: 954ef61f6a user: drh tags: trunk)
16:57
Enhancements to sqlite_memstat: (1) Add an extra "schema" column to show the schema name for ZIPVFS stats. (2) Only show ZIPVFS stats to schema that use ZIPVFS (3) Put a NULL in unused columns of the output. (Closed-Leaf check-in: 9351135b43 user: drh tags: memstat-vtab)
15:45
Add initial ZIPVFS support for the "main" database to the sqlite_memstat virtual table. (check-in: 9cd27350b0 user: drh tags: memstat-vtab)
Changes
Unified Diff Ignore Whitespace Patch
Changes to ext/misc/memstat.c.
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
** Usage example:
**
**     .load ./memstat
**     .mode quote
**     .header on
**     SELECT * FROM memstat;
*/
#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_STMTVTAB)
#if !defined(SQLITEINT_H)
#include "sqlite3ext.h"
#endif
SQLITE_EXTENSION_INIT1
#include <assert.h>
#include <string.h>








|







16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
** Usage example:
**
**     .load ./memstat
**     .mode quote
**     .header on
**     SELECT * FROM memstat;
*/
#if !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_MEMSTATVTAB)
#if !defined(SQLITEINT_H)
#include "sqlite3ext.h"
#endif
SQLITE_EXTENSION_INIT1
#include <assert.h>
#include <string.h>

43
44
45
46
47
48
49
50

51

52
53
54
55
56
57
58
59
** serve as the underlying representation of a cursor that scans
** over rows of the result
*/
typedef struct memstat_cursor memstat_cursor;
struct memstat_cursor {
  sqlite3_vtab_cursor base;  /* Base class - must be first */
  sqlite3 *db;               /* Database connection for this cursor */
  sqlite3_int64 iRowid;      /* The rowid */

  sqlite3_int64 iCur;        /* Current value */

  sqlite3_int64 iHiwtr;      /* High-water mark */
};

/*
** The memstatConnect() method is invoked to create a new
** memstat_vtab that describes the memstat virtual table.
**
** Think of this routine as the constructor for memstat_vtab objects.







|
>
|
>
|







43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
** serve as the underlying representation of a cursor that scans
** over rows of the result
*/
typedef struct memstat_cursor memstat_cursor;
struct memstat_cursor {
  sqlite3_vtab_cursor base;  /* Base class - must be first */
  sqlite3 *db;               /* Database connection for this cursor */
  int iRowid;                /* Current row in aMemstatColumn[] */
  int iDb;                   /* Which schema we are looking at */
  int nDb;                   /* Number of schemas */
  char **azDb;               /* Names of all schemas */
  sqlite3_int64 aVal[2];     /* Result values */
};

/*
** The memstatConnect() method is invoked to create a new
** memstat_vtab that describes the memstat virtual table.
**
** Think of this routine as the constructor for memstat_vtab objects.
73
74
75
76
77
78
79
80

81
82
83
84
85
86
87
88
89
90
  char **pzErr
){
  memstat_vtab *pNew;
  int rc;

/* Column numbers */
#define MSV_COLUMN_NAME    0   /* Name of quantity being measured */
#define MSV_COLUMN_CURRENT 1   /* Current value */

#define MSV_COLUMN_HIWTR   2   /* Highwater mark */

  rc = sqlite3_declare_vtab(db,"CREATE TABLE x(name,current,hiwtr)");
  if( rc==SQLITE_OK ){
    pNew = sqlite3_malloc( sizeof(*pNew) );
    *ppVtab = (sqlite3_vtab*)pNew;
    if( pNew==0 ) return SQLITE_NOMEM;
    memset(pNew, 0, sizeof(*pNew));
    pNew->db = db;
  }







|
>
|

|







75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
  char **pzErr
){
  memstat_vtab *pNew;
  int rc;

/* Column numbers */
#define MSV_COLUMN_NAME    0   /* Name of quantity being measured */
#define MSV_COLUMN_SCHEMA  1   /* schema name */
#define MSV_COLUMN_VALUE   2   /* Current value */
#define MSV_COLUMN_HIWTR   3   /* Highwater mark */

  rc = sqlite3_declare_vtab(db,"CREATE TABLE x(name,schema,value,hiwtr)");
  if( rc==SQLITE_OK ){
    pNew = sqlite3_malloc( sizeof(*pNew) );
    *ppVtab = (sqlite3_vtab*)pNew;
    if( pNew==0 ) return SQLITE_NOMEM;
    memset(pNew, 0, sizeof(*pNew));
    pNew->db = db;
  }
107
108
109
110
111
112
113
114
115















































116
117
118


119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137


138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153




154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175





176





























177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218



219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
  pCur = sqlite3_malloc( sizeof(*pCur) );
  if( pCur==0 ) return SQLITE_NOMEM;
  memset(pCur, 0, sizeof(*pCur));
  pCur->db = ((memstat_vtab*)p)->db;
  *ppCursor = &pCur->base;
  return SQLITE_OK;
}

/*















































** Destructor for a memstat_cursor.
*/
static int memstatClose(sqlite3_vtab_cursor *cur){


  sqlite3_free(cur);
  return SQLITE_OK;
}


/*
** Allowed values for aMemstatColumn[].eType
*/
#define MSV_GSTAT   0          /* sqlite3_status64() information */
#define MSV_DBSTAT  1          /* sqlite3_db_status() information */
#define MSV_ZIPVFS  2          /* ZIPVFS file-control with 64-bit return */

/*
** An array of quantities that can be measured and reported by
** this virtual table
*/
static const struct MemstatColumns {
  const char *zName;    /* Symbolic name */
  int eType;            /* Type of interface */


  int eOp;              /* Opcode */
} aMemstatColumn[] = {
  { "MEMORY_USED",            MSV_GSTAT,   SQLITE_STATUS_MEMORY_USED          },
  { "MALLOC_SIZE",            MSV_GSTAT,   SQLITE_STATUS_MALLOC_SIZE          },
  { "MALLOC_COUNT",           MSV_GSTAT,   SQLITE_STATUS_MALLOC_COUNT         },
  { "PAGECACHE_USED",         MSV_GSTAT,   SQLITE_STATUS_PAGECACHE_USED       },
  { "PAGECACHE_OVERFLOW",     MSV_GSTAT,   SQLITE_STATUS_PAGECACHE_OVERFLOW   },
  { "PAGECACHE_SIZE",         MSV_GSTAT,   SQLITE_STATUS_PAGECACHE_SIZE       },
  { "PARSER_STACK",           MSV_GSTAT,   SQLITE_STATUS_PARSER_STACK         },
  { "DB_LOOKASIDE_USED",      MSV_DBSTAT, SQLITE_DBSTATUS_LOOKASIDE_USED      },
  { "DB_CACHE_USED",          MSV_DBSTAT, SQLITE_DBSTATUS_CACHE_USED          },
  { "DB_SCHEMA_USED",         MSV_DBSTAT, SQLITE_DBSTATUS_SCHEMA_USED         },
  { "DB_STMT_USED",           MSV_DBSTAT, SQLITE_DBSTATUS_STMT_USED           },
  { "DB_LOOKASIDE_HIT",       MSV_DBSTAT, SQLITE_DBSTATUS_LOOKASIDE_HIT       },
  { "DB_LOOKASIDE_MISS_SIZE", MSV_DBSTAT, SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE },
  { "DB_LOOKASIDE_MISS_FULL", MSV_DBSTAT, SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL },




  { "DB_CACHE_HIT",           MSV_DBSTAT, SQLITE_DBSTATUS_CACHE_HIT           },
  { "DB_CACHE_MISS",          MSV_DBSTAT, SQLITE_DBSTATUS_CACHE_MISS          },
  { "DB_CACHE_WRITE",         MSV_DBSTAT, SQLITE_DBSTATUS_CACHE_WRITE         },
  { "DB_DEFERRED_FKS",        MSV_DBSTAT, SQLITE_DBSTATUS_DEFERRED_FKS        },
  { "DB_CACHE_USED_SHARED",   MSV_DBSTAT, SQLITE_DBSTATUS_CACHE_USED_SHARED   },
  { "DB_CACHE_SPILL",         MSV_DBSTAT, SQLITE_DBSTATUS_CACHE_SPILL         },
#ifdef SQLITE_ENABLE_ZIPVFS
  { "ZIPVFS_CACHE_USED",      MSV_ZIPVFS, 231454 },
  { "ZIPVFS_CACHE_HIT",       MSV_ZIPVFS, 231455 },
  { "ZIPVFS_CACHE_MISS",      MSV_ZIPVFS, 231456 },
  { "ZIPVFS_CACHE_WRITE",     MSV_ZIPVFS, 231457 },
  { "ZIPVFS_DIRECT_READ",     MSV_ZIPVFS, 231458 },
  { "ZIPVFS_DIRECT_BYTES",    MSV_ZIPVFS, 231459 },
#endif /* SQLITE_ENABLE_ZIPVFS */
};
#define MSV_NROW (sizeof(aMemstatColumn)/sizeof(aMemstatColumn[0]))

/*
** Advance a memstat_cursor to its next row of output.
*/
static int memstatNext(sqlite3_vtab_cursor *cur){
  memstat_cursor *pCur = (memstat_cursor*)cur;





  pCur->iRowid++;





























  return SQLITE_OK;
}
  

/*
** Return values of columns for the row at which the memstat_cursor
** is currently pointing.
*/
static int memstatColumn(
  sqlite3_vtab_cursor *cur,   /* The cursor */
  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
  int iCol                    /* Which column to return */
){
  memstat_cursor *pCur = (memstat_cursor*)cur;
  int i;
  sqlite3_int64 iCur = 0, iHiwtr = 0;

  assert( pCur->iRowid>0 && pCur->iRowid<=MSV_NROW );
  i = (int)pCur->iRowid - 1;
  if( iCol==MSV_COLUMN_NAME ){
    sqlite3_result_text(ctx, aMemstatColumn[i].zName, -1, SQLITE_STATIC);
    return SQLITE_OK;
  }
  switch( aMemstatColumn[i].eType ){
    case MSV_GSTAT: {
      sqlite3_status64(aMemstatColumn[i].eOp, &iCur, &iHiwtr, 0);
      break;
    }
    case MSV_DBSTAT: {
      int xCur, xHiwtr;
      sqlite3_db_status(pCur->db, aMemstatColumn[i].eOp, &xCur, &xHiwtr, 0);
      iCur = xCur;
      iHiwtr = xHiwtr;
      break;
    }
    case MSV_ZIPVFS: {
      sqlite3_file_control(pCur->db, 0, aMemstatColumn[i].eOp, (void*)&iCur);
      break;
    }
  }
  if( iCol==MSV_COLUMN_HIWTR ) iCur = iHiwtr;
  sqlite3_result_int64(ctx, iCur);



  return SQLITE_OK;
}

/*
** Return the rowid for the current row.  In this implementation, the
** rowid is the same as the output value.
*/
static int memstatRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
  memstat_cursor *pCur = (memstat_cursor*)cur;
  *pRowid = pCur->iRowid;
  return SQLITE_OK;
}

/*
** Return TRUE if the cursor has been moved off of the last
** row of output.
*/









>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>



>
>









|








|
>
>


|
|
|
|
|
|
|
|
<
<
<
|
|
|
>
>
>
>
|
|
|
<
|
|

|
|
|
|
|
|









>
>
>
>
>
|
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>















<
<


<
|


|
|
|


|
<
|
<
<


|
|


<
|
|
>
>
>









|







110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201



202
203
204
205
206
207
208
209
210
211

212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279


280
281

282
283
284
285
286
287
288
289
290

291


292
293
294
295
296
297

298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
  pCur = sqlite3_malloc( sizeof(*pCur) );
  if( pCur==0 ) return SQLITE_NOMEM;
  memset(pCur, 0, sizeof(*pCur));
  pCur->db = ((memstat_vtab*)p)->db;
  *ppCursor = &pCur->base;
  return SQLITE_OK;
}

/*
** Clear all the schema names from a cursor
*/
static void memstatClearSchema(memstat_cursor *pCur){
  int i;
  if( pCur->azDb==0 ) return;
  for(i=0; i<pCur->nDb; i++){
    sqlite3_free(pCur->azDb[i]);
  }
  sqlite3_free(pCur->azDb);
  pCur->azDb = 0;
  pCur->nDb = 0;
}

/*
** Fill in the azDb[] array for the cursor.
*/
static int memstatFindSchemas(memstat_cursor *pCur){
  sqlite3_stmt *pStmt = 0;
  int rc;
  if( pCur->nDb ) return SQLITE_OK;
  rc = sqlite3_prepare_v2(pCur->db, "PRAGMA database_list", -1, &pStmt, 0);
  if( rc ){
    sqlite3_finalize(pStmt);
    return rc;
  }
  while( sqlite3_step(pStmt)==SQLITE_ROW ){
    char **az, *z;
    az = sqlite3_realloc(pCur->azDb, sizeof(char*)*(pCur->nDb+1));
    if( az==0 ){
      memstatClearSchema(pCur);
      return SQLITE_NOMEM;
    }
    pCur->azDb = az;
    z = sqlite3_mprintf("%s", sqlite3_column_text(pStmt, 1));
    if( z==0 ){
      memstatClearSchema(pCur);
      return SQLITE_NOMEM;
    }
    pCur->azDb[pCur->nDb] = z;
    pCur->nDb++;
  }
  sqlite3_finalize(pStmt);
  return SQLITE_OK;
}


/*
** Destructor for a memstat_cursor.
*/
static int memstatClose(sqlite3_vtab_cursor *cur){
  memstat_cursor *pCur = (memstat_cursor*)cur;
  memstatClearSchema(pCur);
  sqlite3_free(cur);
  return SQLITE_OK;
}


/*
** Allowed values for aMemstatColumn[].eType
*/
#define MSV_GSTAT   0          /* sqlite3_status64() information */
#define MSV_DB      1          /* sqlite3_db_status() information */
#define MSV_ZIPVFS  2          /* ZIPVFS file-control with 64-bit return */

/*
** An array of quantities that can be measured and reported by
** this virtual table
*/
static const struct MemstatColumns {
  const char *zName;    /* Symbolic name */
  unsigned char eType;  /* Type of interface */
  unsigned char mNull;  /* Bitmask of which columns are NULL */
                        /* 2: dbname,  4: current,  8: hiwtr */
  int eOp;              /* Opcode */
} aMemstatColumn[] = {
 {"MEMORY_USED",            MSV_GSTAT,  2, SQLITE_STATUS_MEMORY_USED          },
 {"MALLOC_SIZE",            MSV_GSTAT,  6, SQLITE_STATUS_MALLOC_SIZE          },
 {"MALLOC_COUNT",           MSV_GSTAT,  2, SQLITE_STATUS_MALLOC_COUNT         },
 {"PAGECACHE_USED",         MSV_GSTAT,  2, SQLITE_STATUS_PAGECACHE_USED       },
 {"PAGECACHE_OVERFLOW",     MSV_GSTAT,  2, SQLITE_STATUS_PAGECACHE_OVERFLOW   },
 {"PAGECACHE_SIZE",         MSV_GSTAT,  6, SQLITE_STATUS_PAGECACHE_SIZE       },
 {"PARSER_STACK",           MSV_GSTAT,  6, SQLITE_STATUS_PARSER_STACK         },
 {"DB_LOOKASIDE_USED",      MSV_DB,     2, SQLITE_DBSTATUS_LOOKASIDE_USED     },



 {"DB_LOOKASIDE_HIT",       MSV_DB,     6, SQLITE_DBSTATUS_LOOKASIDE_HIT      },
 {"DB_LOOKASIDE_MISS_SIZE", MSV_DB,     6, SQLITE_DBSTATUS_LOOKASIDE_MISS_SIZE},
 {"DB_LOOKASIDE_MISS_FULL", MSV_DB,     6, SQLITE_DBSTATUS_LOOKASIDE_MISS_FULL},
 {"DB_CACHE_USED",          MSV_DB,    10, SQLITE_DBSTATUS_CACHE_USED         },
 {"DB_CACHE_USED_SHARED",   MSV_DB,    10, SQLITE_DBSTATUS_CACHE_USED_SHARED  },
 {"DB_SCHEMA_USED",         MSV_DB,    10, SQLITE_DBSTATUS_SCHEMA_USED        },
 {"DB_STMT_USED",           MSV_DB,    10, SQLITE_DBSTATUS_STMT_USED          },
 {"DB_CACHE_HIT",           MSV_DB,    10, SQLITE_DBSTATUS_CACHE_HIT          },
 {"DB_CACHE_MISS",          MSV_DB,    10, SQLITE_DBSTATUS_CACHE_MISS         },
 {"DB_CACHE_WRITE",         MSV_DB,    10, SQLITE_DBSTATUS_CACHE_WRITE        },

 {"DB_CACHE_SPILL",         MSV_DB,    10, SQLITE_DBSTATUS_CACHE_SPILL        },
 {"DB_DEFERRED_FKS",        MSV_DB,    10, SQLITE_DBSTATUS_DEFERRED_FKS       },
#ifdef SQLITE_ENABLE_ZIPVFS
 {"ZIPVFS_CACHE_USED",      MSV_ZIPVFS, 8, 231454 },
 {"ZIPVFS_CACHE_HIT",       MSV_ZIPVFS, 8, 231455 },
 {"ZIPVFS_CACHE_MISS",      MSV_ZIPVFS, 8, 231456 },
 {"ZIPVFS_CACHE_WRITE",     MSV_ZIPVFS, 8, 231457 },
 {"ZIPVFS_DIRECT_READ",     MSV_ZIPVFS, 8, 231458 },
 {"ZIPVFS_DIRECT_BYTES",    MSV_ZIPVFS, 8, 231459 },
#endif /* SQLITE_ENABLE_ZIPVFS */
};
#define MSV_NROW (sizeof(aMemstatColumn)/sizeof(aMemstatColumn[0]))

/*
** Advance a memstat_cursor to its next row of output.
*/
static int memstatNext(sqlite3_vtab_cursor *cur){
  memstat_cursor *pCur = (memstat_cursor*)cur;
  int i;
  assert( pCur->iRowid<=MSV_NROW );
  while(1){
    i = (int)pCur->iRowid - 1;
    if( (aMemstatColumn[i].mNull & 2)!=0 || (++pCur->iDb)>=pCur->nDb ){
      pCur->iRowid++;
      if( pCur->iRowid>MSV_NROW ) return SQLITE_OK;  /* End of the table */
      pCur->iDb = 0;
      i++;
    }
    pCur->aVal[0] = 0;
    pCur->aVal[1] = 0;    
    switch( aMemstatColumn[i].eType ){
      case MSV_GSTAT: {
        sqlite3_status64(aMemstatColumn[i].eOp,
                         &pCur->aVal[0], &pCur->aVal[1],0);
        break;
      }
      case MSV_DB: {
        int xCur, xHiwtr;
        sqlite3_db_status(pCur->db, aMemstatColumn[i].eOp, &xCur, &xHiwtr, 0);
        pCur->aVal[0] = xCur;
        pCur->aVal[1] = xHiwtr;
        break;
      }
      case MSV_ZIPVFS: {
        int rc;
        rc = sqlite3_file_control(pCur->db, pCur->azDb[pCur->iDb],
                                  aMemstatColumn[i].eOp, (void*)&pCur->aVal[0]);
        if( rc!=SQLITE_OK ) continue;
        break;
      }
    }
    break;
  }
  return SQLITE_OK;
}
  

/*
** Return values of columns for the row at which the memstat_cursor
** is currently pointing.
*/
static int memstatColumn(
  sqlite3_vtab_cursor *cur,   /* The cursor */
  sqlite3_context *ctx,       /* First argument to sqlite3_result_...() */
  int iCol                    /* Which column to return */
){
  memstat_cursor *pCur = (memstat_cursor*)cur;
  int i;


  assert( pCur->iRowid>0 && pCur->iRowid<=MSV_NROW );
  i = (int)pCur->iRowid - 1;

  if( (aMemstatColumn[i].mNull & (1<<iCol))!=0 ){
    return SQLITE_OK;
  }
  switch( iCol ){
    case MSV_COLUMN_NAME: {
      sqlite3_result_text(ctx, aMemstatColumn[i].zName, -1, SQLITE_STATIC);
      break;
    }
    case MSV_COLUMN_SCHEMA: {

      sqlite3_result_text(ctx, pCur->azDb[pCur->iDb], -1, 0);


      break;
    }
    case MSV_COLUMN_VALUE: {
      sqlite3_result_int64(ctx, pCur->aVal[0]);
      break;
    }

    case MSV_COLUMN_HIWTR: {
      sqlite3_result_int64(ctx, pCur->aVal[1]);
      break;
    }
  }
  return SQLITE_OK;
}

/*
** Return the rowid for the current row.  In this implementation, the
** rowid is the same as the output value.
*/
static int memstatRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
  memstat_cursor *pCur = (memstat_cursor*)cur;
  *pRowid = pCur->iRowid*1000 + pCur->iDb;
  return SQLITE_OK;
}

/*
** Return TRUE if the cursor has been moved off of the last
** row of output.
*/
246
247
248
249
250
251
252
253

254
255
256
257
258
259
260
261
*/
static int memstatFilter(
  sqlite3_vtab_cursor *pVtabCursor, 
  int idxNum, const char *idxStr,
  int argc, sqlite3_value **argv
){
  memstat_cursor *pCur = (memstat_cursor *)pVtabCursor;
  pCur->iRowid = 0;

  return memstatNext(pVtabCursor);
}

/*
** SQLite will invoke this method one or more times while planning a query
** that uses the memstat virtual table.  This routine needs to create
** a query plan for each invocation and compute an estimated cost for that
** plan.







|
>
|







330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
*/
static int memstatFilter(
  sqlite3_vtab_cursor *pVtabCursor, 
  int idxNum, const char *idxStr,
  int argc, sqlite3_value **argv
){
  memstat_cursor *pCur = (memstat_cursor *)pVtabCursor;
  pCur->iRowid = 1;
  pCur->iDb = 0;
  return memstatFindSchemas(pCur);
}

/*
** SQLite will invoke this method one or more times while planning a query
** that uses the memstat virtual table.  This routine needs to create
** a query plan for each invocation and compute an estimated cost for that
** plan.
322
323
324
325
326
327
328
329
  SQLITE_EXTENSION_INIT2(pApi);
#ifndef SQLITE_OMIT_VIRTUALTABLE
  rc = sqlite3MemstatVtabInit(db);
#endif
  return rc;
}
#endif /* SQLITE_CORE */
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_STMTVTAB) */







|
407
408
409
410
411
412
413
414
  SQLITE_EXTENSION_INIT2(pApi);
#ifndef SQLITE_OMIT_VIRTUALTABLE
  rc = sqlite3MemstatVtabInit(db);
#endif
  return rc;
}
#endif /* SQLITE_CORE */
#endif /* !defined(SQLITE_CORE) || defined(SQLITE_ENABLE_MEMSTATVTAB) */