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Comment:Enhance the virtual table in test_schemapool.c so that it can be used to check that SHARED_SCHEMA connections are not allocating and freeing schemas when they should not be.
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SHA3-256: cb236cb98564b870317ba3e481a3c7d7f9769b0294a01246bcb724f04e1e7b10
User & Date: dan 2019-02-15 19:36:47
Wiki:reuse-schema
Context
2019-02-18
18:16
Ensure that creating temp schema items does not cause an OPEN_SHARABLE_SCHEMA connection to load all schemas into memory. check-in: 88cbf54e user: dan tags: reuse-schema
2019-02-15
19:36
Enhance the virtual table in test_schemapool.c so that it can be used to check that SHARED_SCHEMA connections are not allocating and freeing schemas when they should not be. check-in: cb236cb9 user: dan tags: reuse-schema
19:00
Fix a problem with eponymous virtual tables and SHARED_SCHEMA databases. Also, after preparing statements that require all database schemas (REINDEX, ANALYZE, CREATE, DROP and some PRAGMA statements), do not allow the database connection to return more than one schema to each schema-pool. check-in: ecf6251e user: dan tags: reuse-schema
Changes
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Changes to src/callback.c. 

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**      SchemaPool. DB_SchemaLoaded flag is set.
**
**   3) pSPool!=0, pSchema points to the SchemaPool's static object
**      (SchemaPool.sSchema).
*/
struct SchemaPool {
  int nRef;                       /* Number of pointers to this object */

  u64 cksum;                      /* Checksum for this Schema contents */
  Schema *pSchema;                /* Linked list of Schema objects */
  Schema sSchema;                 /* The single dummy schema object */
  SchemaPool *pNext;              /* Next element in schemaPoolList */
};

#ifdef SQLITE_DEBUG
................................................................................
  ** at least one other copy of the schema being released, delete it instead
  ** of returning it to the schema-pool.  */
  if( db->mDbFlags & DBFLAG_FreeSchema ){
    int i;
    for(i=0; i<db->nDb; i++){
      Db *p = &db->aDb[i];
      if( p!=pDb && p->pSchema!=&pSPool->sSchema && pDb->pSPool==p->pSPool ){

        schemaDelete(pRelease);
        return;
      }
    }
  }

  pRelease->pNext = pDb->pSPool->pSchema;








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**      SchemaPool. DB_SchemaLoaded flag is set.
**
**   3) pSPool!=0, pSchema points to the SchemaPool's static object
**      (SchemaPool.sSchema).
*/
struct SchemaPool {
  int nRef;                       /* Number of pointers to this object */
  int nDelete;                    /* Schema objects deleted by ReleaseAll() */
  u64 cksum;                      /* Checksum for this Schema contents */
  Schema *pSchema;                /* Linked list of Schema objects */
  Schema sSchema;                 /* The single dummy schema object */
  SchemaPool *pNext;              /* Next element in schemaPoolList */
};

#ifdef SQLITE_DEBUG
................................................................................
  ** at least one other copy of the schema being released, delete it instead
  ** of returning it to the schema-pool.  */
  if( db->mDbFlags & DBFLAG_FreeSchema ){
    int i;
    for(i=0; i<db->nDb; i++){
      Db *p = &db->aDb[i];
      if( p!=pDb && p->pSchema!=&pSPool->sSchema && pDb->pSPool==p->pSPool ){
        pSPool->nDelete++;
        schemaDelete(pRelease);
        return;
      }
    }
  }

  pRelease->pNext = pDb->pSPool->pSchema;

Changes to src/test_schemapool.c. 

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/* The code in this file defines a sqlite3 virtual-table module with
** the following schema.
*/
#define SCHEMAPOOL_SCHEMA \
"CREATE TABLE x("         \
"  cksum   INTEGER, "     \
"  nref    INTEGER, "     \
"  nschema INTEGER  "     \

")"



typedef struct schemapool_vtab schemapool_vtab;
typedef struct schemapool_cursor schemapool_cursor;

/* A schema table object */
struct schemapool_vtab {
  sqlite3_vtab base;
................................................................................
}

/*
** Retrieve a column of data.
*/
static int schemaPoolColumn(sqlite3_vtab_cursor *cur, sqlite3_context *ctx, int i){
  schemapool_cursor *pCur = (schemapool_cursor*)cur;
  assert( i==0 || i==1 || i==2 );
  sqlite3_result_int64(ctx, pCur->aData[pCur->iRow*3 + i]);
  return SQLITE_OK;
}

/*
** Retrieve the current rowid.
*/
static int schemaPoolRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
................................................................................
  schemapool_cursor *pCur = (schemapool_cursor*)cur;
  pCur->iRow++;
  return SQLITE_OK;
}

struct SchemaPool {
  int nRef;                       /* Number of pointers to this object */

  u64 cksum;                      /* Checksum for this Schema contents */
  Schema *pSchema;                /* Linked list of Schema objects */
  Schema sSchema;                 /* The single dummy schema object */
  SchemaPool *pNext;              /* Next element in schemaPoolList */
};
extern SchemaPool *sqlite3SchemaPoolList(void);

................................................................................

  for(pSPool = sqlite3SchemaPoolList(); pSPool; pSPool=pSPool->pNext){
    pCur->nRow++;
  }

  if( pCur->nRow ){
    int iRow = 0;

    pCur->aData = (i64*)sqlite3_malloc(3 * pCur->nRow * sizeof(i64));
    if( pCur->aData==0 ) return SQLITE_NOMEM;
    for(pSPool = sqlite3SchemaPoolList(); pSPool; pSPool=pSPool->pNext){
      Schema *p;
      i64 nSchema = 0;
      for(p=pSPool->pSchema; p; p=p->pNext){
        nSchema++;
      }
      pCur->aData[0 + iRow*3] = pSPool->cksum;
      pCur->aData[1 + iRow*3] = (i64)pSPool->nRef;
      pCur->aData[2 + iRow*3] = nSchema;

      iRow++;
    }
  }

  return SQLITE_OK;
}









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/* The code in this file defines a sqlite3 virtual-table module with
** the following schema.
*/
#define SCHEMAPOOL_SCHEMA \
"CREATE TABLE x("         \
"  cksum   INTEGER, "     \
"  nref    INTEGER, "     \
"  nschema INTEGER, "     \
"  ndelete INTEGER  "     \
")"

#define SCHEMAPOOL_NFIELD 4

typedef struct schemapool_vtab schemapool_vtab;
typedef struct schemapool_cursor schemapool_cursor;

/* A schema table object */
struct schemapool_vtab {
  sqlite3_vtab base;
................................................................................
}

/*
** Retrieve a column of data.
*/
static int schemaPoolColumn(sqlite3_vtab_cursor *cur, sqlite3_context *ctx, int i){
  schemapool_cursor *pCur = (schemapool_cursor*)cur;
  assert( i==0 || i==1 || i==2 || i==3 );
  sqlite3_result_int64(ctx, pCur->aData[pCur->iRow*SCHEMAPOOL_NFIELD + i]);
  return SQLITE_OK;
}

/*
** Retrieve the current rowid.
*/
static int schemaPoolRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
................................................................................
  schemapool_cursor *pCur = (schemapool_cursor*)cur;
  pCur->iRow++;
  return SQLITE_OK;
}

struct SchemaPool {
  int nRef;                       /* Number of pointers to this object */
  int nDelete;                    /* Schema objects deleted by ReleaseAll() */
  u64 cksum;                      /* Checksum for this Schema contents */
  Schema *pSchema;                /* Linked list of Schema objects */
  Schema sSchema;                 /* The single dummy schema object */
  SchemaPool *pNext;              /* Next element in schemaPoolList */
};
extern SchemaPool *sqlite3SchemaPoolList(void);

................................................................................

  for(pSPool = sqlite3SchemaPoolList(); pSPool; pSPool=pSPool->pNext){
    pCur->nRow++;
  }

  if( pCur->nRow ){
    int iRow = 0;
    int nByte = SCHEMAPOOL_NFIELD * pCur->nRow * sizeof(i64);
    pCur->aData = (i64*)sqlite3_malloc(nByte);
    if( pCur->aData==0 ) return SQLITE_NOMEM;
    for(pSPool = sqlite3SchemaPoolList(); pSPool; pSPool=pSPool->pNext){
      Schema *p;
      i64 nSchema = 0;
      for(p=pSPool->pSchema; p; p=p->pNext){
        nSchema++;
      }
      pCur->aData[0 + iRow*SCHEMAPOOL_NFIELD] = pSPool->cksum;
      pCur->aData[1 + iRow*SCHEMAPOOL_NFIELD] = (i64)pSPool->nRef;
      pCur->aData[2 + iRow*SCHEMAPOOL_NFIELD] = nSchema;
      pCur->aData[3 + iRow*SCHEMAPOOL_NFIELD] = (i64)pSPool->nDelete;
      iRow++;
    }
  }

  return SQLITE_OK;
}

Changes to test/reuse2.test. 

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} {}

do_execsql_test -db db1 3.2.1 { SELECT * FROM t1 }
do_execsql_test -db db2 3.2.2 { SELECT * FROM t1 }

register_schemapool_module db
do_execsql_test 3.3 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool;

} {nref=2 nschema=1}

sqlite3 db3 test.db -shared-schema 1
register_schemapool_module db3

do_execsql_test 3.5 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool;

} {nref=2 nschema=1}

do_execsql_test -db db3 3.6 { 
  SELECT * FROM t1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool;

} {nref=3 nschema=1}

do_execsql_test 3.7 { 
  CREATE TABLE t2(x);
}

do_execsql_test 3.8 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool;

} {nref=3 nschema=1}

do_execsql_test -db db1 3.9.1 { SELECT * FROM t1 }
do_execsql_test 3.9.2 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {nref=1 nschema=1 nref=2 nschema=1}

do_execsql_test -db db2 3.10.1 { SELECT * FROM t1 }
do_execsql_test 3.10.2 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {nref=1 nschema=1 nref=2 nschema=1}

do_execsql_test -db db3 3.11.1 { SELECT * FROM t1 }
do_execsql_test 3.11.2 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {nref=3 nschema=1}

#--------------------------------------------------------------------------
catch {db1 close}
catch {db2 close}
catch {db3 close}
reset_db
do_execsql_test 4.0.1 {
................................................................................
  }
  sqlite3 db  test.db
  sqlite3 db2 test.db -shared-schema 1
} {}

register_schemapool_module db
do_execsql_test 4.0.3 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {}

do_test 4.1.1 {
  execsql { 
    ATTACH 'test.db1' AS db1; 
    ATTACH 'test.db2' AS db2;
    ATTACH 'test.db3' AS db3;
    ATTACH 'test.db4' AS db4;
    ATTACH 'test.db5' AS db5;
  } db2
} {}
do_execsql_test 4.1.2 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {}
do_execsql_test -db db2 4.1.3 {
  SELECT * FROM db3.x1
}
do_execsql_test 4.1.4 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {nref=1 nschema=1}
do_execsql_test -db db2 4.1.5 {
  SELECT * FROM db2.x1
}
do_execsql_test 4.1.6 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {nref=2 nschema=1}
do_execsql_test -db db2 4.1.7 {
  SELECT * FROM x1
}
do_execsql_test 4.1.8 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {nref=6 nschema=1}

do_test 4.2.1 {
  catchsql { SELECT * FROM abc } db2
} {1 {no such table: abc}}
do_execsql_test 4.2.2 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {nref=6 nschema=1}

register_schemapool_module db2
do_execsql_test -db db2 4.3.1 {
  INSERT INTO x1 VALUES(1, 2, 3);
  INSERT INTO db1.x1 VALUES(4, 5, 6);
  INSERT INTO db2.x1 VALUES(7, 8, 9);
  INSERT INTO db3.x1 VALUES(10, 11, 12);
  INSERT INTO db4.x1 VALUES(13, 14, 15);
  INSERT INTO db5.x1 VALUES(16, 17, 18);
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {nref=6 nschema=1}

do_execsql_test -db db2 4.3.2 {
  SELECT * FROM db5.x1;
  SELECT * FROM db4.x1;
  SELECT * FROM db3.x1;
  SELECT * FROM db2.x1;
  SELECT * FROM db1.x1;
  SELECT * FROM x1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {
  16 17 18  13 14 15  10 11 12  7 8 9  4 5 6  1 2 3
  nref=6 nschema=1
}

do_execsql_test -db db2 4.3.3 {
  UPDATE x1 SET a=a+10;
  UPDATE db5.x1 SET a=a+10;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {
  nref=6 nschema=1
}

do_execsql_test -db db2 4.3.4 {
  SELECT * FROM db5.x1;
  SELECT * FROM db4.x1;
  SELECT * FROM db3.x1;
  SELECT * FROM db2.x1;
  SELECT * FROM db1.x1;
  SELECT * FROM x1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {
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  nref=6 nschema=1
}

do_execsql_test -db db2 4.3.5 {
  DELETE FROM db3.x1;
  DELETE FROM x1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {
  nref=6 nschema=1
}

do_execsql_test -db db2 4.3.6 {
  SELECT * FROM db5.x1;
  SELECT * FROM db4.x1;
  SELECT * FROM db3.x1;
  SELECT * FROM db2.x1;
  SELECT * FROM db1.x1;
  SELECT * FROM x1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {
  26 17 18  13 14 15  7 8 9  4 5 6 
  nref=6 nschema=1
}

do_execsql_test -db db2 4.3.6 {
  SELECT * FROM db5.x1, db4.x1, db1.x1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {26 17 18 13 14 15 4 5 6 nref=6 nschema=3}

#--------------------------------------------------------------------------
# Test the incremental-blob API with REUSE_SCHEMA connections.
#
catch {db1 close}
catch {db2 close}
catch {db3 close}
................................................................................
    forcecopy test.db test.db${i}
    sqlite3 db test.db${i}
    db eval { INSERT INTO bbb VALUES(123, 'database_' || $i) }
    db close
    db2 eval "ATTACH 'test.db${i}' AS db${i}"
  }
  execsql {
    SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

  } db2
} {nref=6 nschema=1}

do_test 5.1.1 {
  set res [list]
  for {set i 1} {$i<6} {incr i} {
    set chan [db2 incrblob db${i} bbb b 123]
    lappend res [gets $chan]
    close $chan
  }
  set res
} {database_1 database_2 database_3 database_4 database_5}

do_execsql_test -db db2 5.1.2 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {nref=6 nschema=1}

do_test 5.2.1 {
  sqlite3_table_column_metadata db2 main bbb a
} {INTEGER BINARY 0 1 0}
do_test 5.2.2 {
  sqlite3_table_column_metadata db2 main bbb b
} {{} BINARY 0 0 0}

do_execsql_test -db db2 5.2.3 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {nref=6 nschema=1}

breakpoint
do_execsql_test -db db2 5.2.4 {
  PRAGMA integrity_check;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool ORDER BY 1;

} {ok nref=6 nschema=1}

finish_test









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} {}

do_execsql_test -db db1 3.2.1 { SELECT * FROM t1 }
do_execsql_test -db db2 3.2.2 { SELECT * FROM t1 }

register_schemapool_module db
do_execsql_test 3.3 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=2 nschema=1 ndelete=0}

sqlite3 db3 test.db -shared-schema 1
register_schemapool_module db3

do_execsql_test 3.5 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=2 nschema=1 ndelete=0}

do_execsql_test -db db3 3.6 { 
  SELECT * FROM t1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=3 nschema=1 ndelete=0}

do_execsql_test 3.7 { 
  CREATE TABLE t2(x);
}

do_execsql_test 3.8 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=3 nschema=1 ndelete=0}

do_execsql_test -db db1 3.9.1 { SELECT * FROM t1 }
do_execsql_test 3.9.2 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=1 nschema=1 ndelete=0 nref=2 nschema=1 ndelete=0}

do_execsql_test -db db2 3.10.1 { SELECT * FROM t1 }
do_execsql_test 3.10.2 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool ORDER BY 1;
} {nref=1 nschema=1 ndelete=0 nref=2 nschema=1 ndelete=0}

do_execsql_test -db db3 3.11.1 { SELECT * FROM t1 }
do_execsql_test 3.11.2 { 
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=3 nschema=1 ndelete=0}

#--------------------------------------------------------------------------
catch {db1 close}
catch {db2 close}
catch {db3 close}
reset_db
do_execsql_test 4.0.1 {
................................................................................
  }
  sqlite3 db  test.db
  sqlite3 db2 test.db -shared-schema 1
} {}

register_schemapool_module db
do_execsql_test 4.0.3 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {}

do_test 4.1.1 {
  execsql { 
    ATTACH 'test.db1' AS db1; 
    ATTACH 'test.db2' AS db2;
    ATTACH 'test.db3' AS db3;
    ATTACH 'test.db4' AS db4;
    ATTACH 'test.db5' AS db5;
  } db2
} {}
do_execsql_test 4.1.2 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {}
do_execsql_test -db db2 4.1.3 {
  SELECT * FROM db3.x1
}
do_execsql_test 4.1.4 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=1 nschema=1 ndelete=0}
do_execsql_test -db db2 4.1.5 {
  SELECT * FROM db2.x1
}
do_execsql_test 4.1.6 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=2 nschema=1 ndelete=0}
do_execsql_test -db db2 4.1.7 {
  SELECT * FROM x1
}
do_execsql_test 4.1.8 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=6 nschema=1 ndelete=0}

do_test 4.2.1 {
  catchsql { SELECT * FROM abc } db2
} {1 {no such table: abc}}
do_execsql_test 4.2.2 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=6 nschema=1 ndelete=0}

register_schemapool_module db2
do_execsql_test -db db2 4.3.1 {
  INSERT INTO x1 VALUES(1, 2, 3);
  INSERT INTO db1.x1 VALUES(4, 5, 6);
  INSERT INTO db2.x1 VALUES(7, 8, 9);
  INSERT INTO db3.x1 VALUES(10, 11, 12);
  INSERT INTO db4.x1 VALUES(13, 14, 15);
  INSERT INTO db5.x1 VALUES(16, 17, 18);
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=6 nschema=1 ndelete=0}

do_execsql_test -db db2 4.3.2 {
  SELECT * FROM db5.x1;
  SELECT * FROM db4.x1;
  SELECT * FROM db3.x1;
  SELECT * FROM db2.x1;
  SELECT * FROM db1.x1;
  SELECT * FROM x1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {
  16 17 18  13 14 15  10 11 12  7 8 9  4 5 6  1 2 3
  nref=6 nschema=1 ndelete=0
}

do_execsql_test -db db2 4.3.3 {
  UPDATE x1 SET a=a+10;
  UPDATE db5.x1 SET a=a+10;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {
  nref=6 nschema=1 ndelete=0
}

do_execsql_test -db db2 4.3.4 {
  SELECT * FROM db5.x1;
  SELECT * FROM db4.x1;
  SELECT * FROM db3.x1;
  SELECT * FROM db2.x1;
  SELECT * FROM db1.x1;
  SELECT * FROM x1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {
  26 17 18  13 14 15  10 11 12  7 8 9  4 5 6  11 2 3
  nref=6 nschema=1 ndelete=0
}

do_execsql_test -db db2 4.3.5 {
  DELETE FROM db3.x1;
  DELETE FROM x1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {
  nref=6 nschema=1 ndelete=0
}

do_execsql_test -db db2 4.3.6 {
  SELECT * FROM db5.x1;
  SELECT * FROM db4.x1;
  SELECT * FROM db3.x1;
  SELECT * FROM db2.x1;
  SELECT * FROM db1.x1;
  SELECT * FROM x1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {
  26 17 18  13 14 15  7 8 9  4 5 6 
  nref=6 nschema=1 ndelete=0
}

do_execsql_test -db db2 4.3.6 {
  SELECT * FROM db5.x1, db4.x1, db1.x1;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {26 17 18 13 14 15 4 5 6 nref=6 nschema=3 ndelete=0}

#--------------------------------------------------------------------------
# Test the incremental-blob API with REUSE_SCHEMA connections.
#
catch {db1 close}
catch {db2 close}
catch {db3 close}
................................................................................
    forcecopy test.db test.db${i}
    sqlite3 db test.db${i}
    db eval { INSERT INTO bbb VALUES(123, 'database_' || $i) }
    db close
    db2 eval "ATTACH 'test.db${i}' AS db${i}"
  }
  execsql {
    SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
      FROM schemapool;
  } db2
} {nref=6 nschema=1 ndelete=0}

do_test 5.1.1 {
  set res [list]
  for {set i 1} {$i<6} {incr i} {
    set chan [db2 incrblob db${i} bbb b 123]
    lappend res [gets $chan]
    close $chan
  }
  set res
} {database_1 database_2 database_3 database_4 database_5}

do_execsql_test -db db2 5.1.2 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=6 nschema=1 ndelete=0}

do_test 5.2.1 {
  sqlite3_table_column_metadata db2 main bbb a
} {INTEGER BINARY 0 1 0}
do_test 5.2.2 {
  sqlite3_table_column_metadata db2 main bbb b
} {{} BINARY 0 0 0}

do_execsql_test -db db2 5.2.3 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {nref=6 nschema=1 ndelete=0}


do_execsql_test -db db2 5.2.4 {
  PRAGMA integrity_check;
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete
  FROM schemapool;
} {ok nref=6 nschema=1 ndelete=5}

finish_test

Changes to test/reuse3.test. 

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  for {set i 1} {$i < 5} {incr i} {
    forcedelete test.db${i} test.db${i}-wal test.db${i}-journal
    forcecopy test.db test.db${i}
    execsql "ATTACH 'test.db${i}' AS db${i}"
  }
  register_schemapool_module db
  set {} {}

  execsql { SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool }


} {nref=5 nschema=1}


do_execsql_test 4.1.3 {
  REINDEX x1;
  REINDEX x1a;
  REINDEX x1b;
  REINDEX x1c;
  REINDEX db1.x1a;
  REINDEX db2.x1b;
  REINDEX db3.x1c;
  REINDEX;
}

do_execsql_test 4.1.4 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema FROM schemapool;

} {nref=5 nschema=1}

finish_test









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  for {set i 1} {$i < 5} {incr i} {
    forcedelete test.db${i} test.db${i}-wal test.db${i}-journal
    forcecopy test.db test.db${i}
    execsql "ATTACH 'test.db${i}' AS db${i}"
  }
  register_schemapool_module db
  set {} {}
  execsql { 
    SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete 
    FROM schemapool 
  }
} {nref=5 nschema=1 ndelete=0}

breakpoint
do_execsql_test 4.1.3 {
  REINDEX  x1;
  REINDEX  x1a;
  REINDEX  x1b;
  REINDEX  x1c;
  REINDEX  db1.x1a;
  REINDEX  db2.x1b;

  REINDEX  db3.x1c;
}

do_execsql_test 4.1.4 {
  SELECT 'nref=' || nRef, 'nschema=' || nSchema, 'ndelete=' || nDelete 
    FROM schemapool 
} {nref=5 nschema=1 ndelete=28}

finish_test

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